iter cryostat main chamber and vacuum vessel pressure

JAERI-Tech99-026

JP9950289

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ITER CRYOSTAT MAIN CHAMBER AND VACUUM VESSELPRESSURE SUPPRESSION SYSTEM DESIGN

March 1999

Akira ITO, Masataka NAKAHIRA,

Hiroyuki TAKAHASHI, Eisuke TADA,

Yoshitane NAKASfflMA* and Osamu UENO*

Japan Atomic Energy Research Institute

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This report is issued irregularly.Inquiries about availability of the reports should be addressed to Research

Information Division, Department of Intellectual Resources, Japan Atomic EnergyResearch Institute, Tokai-mura, Naka-gun, Ibaraki-ken 7319-1195, Japan.

©Japan Atomic Energy Research Institute, 1999

SMW-Wn a * IS =? ti fiff % PJT

JAERI-Tech 99-026

ITER Cryostat Main Chamberand Vacuum Vessel Pressure Suppression System Design

Akira ITO, Masataka NAKAHIRA, Hiroyuki TAKAHASHI,Eisuke TADA, Yoshitane NAKASHIMA* and Osamu UENO * *

Department of Fusion Engineering Research(Tokai Site)

Naka Fusion Research EstablishmentJapan Atomic Energy Research Institute

Tokai-mura, Naka-gun, Ibaraki-ken

(Received February 10, 1999)

Design of Cryostat Main Chamber and Vacuum Vessel Pressure SuppressionSystem (WPS) of International Thermonuclear Experimental Reactor (ITER) hasbeen conducted.

The cryostat is a cylindrical vessel that includes in-vessel component such asvacuum vessel, superconducting toroidal coils and poloidal coils. This cryostatprovides the adiabatic vacuum about 10"4 Pa for the superconducting coils operatingat 4 K and forms the second confinement barrier to tritium. The adiabatic vacuumis to reduce thermal loads applied to the superconducting coils and their supports soas to keep their temperature 4 K.

The WPS consists of a suppression tank located under the lower bio-shield and 4relief pipes to connect the vacuum vessel and the suppression tank The WPS is tokeep the maximum pressure rise of the vacuum vessel below the design value of 0.5MPa in case of the in-vessel LOCA (water spillage from in-vessel component). Thespilled water and steam are led to the suppression tank through the relief pipeswhen the internal pressure of vacuum vessel is over 0.2 MPa, and then the internalpressure is kept below 0,5 MPa.

This work is conducted as an ITER design study and this report corresponds to 1996 ITER Design

Task Agreement on Cryostat Main Chamber and W P S Design' (N24TD04FJ (D312)).

* ITER Joint Central Team (JCT) (Naka Site)

* * Ishikawajima Harima Heavy Industries Co.

JAERI-Tech 99-026

This report summarizes the structural design of the cryostat main chamber and

pressure suppression system, together with their fabrication and installation.

Keywords : ITER, Cryostat, Vacuum Vessel, Super conducting Coil, WPS,

Suppression Tank, Relief Pipe

JAERI-Tech 99-026

10

, 4K

(0.5MPa)

o.2MPa

0.5MPa «

N24TD04FJ(D312)CD TiTER ^ y4 ^^ 9 y

IWW^if (MfflBfe) : T 3 1 9 - 1 1 9 5* ITERJCT* *

1996 ¥ ITER

2 - 4

111

This is a blank page.

JAERI-Tech 99-026

Contents

1. Introduction 1

2. Cryostat Design Description 5

2.1 Introduction 5

2.2 Design Conditions 5

2.3 Cryostat and Penetration Design 9

2.4 Upper/Lower Cover Remote Cutting and Rewelding Equipment 28

2.5 Study of Fabrication/Construction Plan and Schedule 57

2.6 Future Works and R&D Activities 68

3. Suppression Tank Detail Design 69

3.1 Introduction 69

3.2 Design Conditions 69

3.3 Detailed Design of Suppression Tank 70

3.4 Rupture Disk/Bellows Detailed Design 76

3.5 Study of Disassembly and Assembly at Maintenance 79

3.6 Study of Rupture Disk Exchange Plan 93

3.7 Study of Fabrication/Construction Plan and Schedule 103

3.8 Future Works and R&D Activities 109

4. Conclusions- 110

4.1 Cryostat 1 io

4.2 Suppression Tank 110

Acknowledgement 110

Attachment Cryostat and Suppression Tank Drawings 111

JAERI-Tech 99-026

@

VI

JAERI-Tech 99-026

1. Introduction

1.1 Background and Objectives

The purpose of this design study is to perform the design of the following

elements of WBS 2.4 (Cryostat):

2.4.A Cryostat Main Chamber

2.4.B Cryostat Penetrations (those elements which are integral with the cryostat main

chamber).

2.4.E Vacuum Vessel Pressure Suppression System

The current ITER schedule foresees that the items which are the subject of this design

study are on the Critical Construction Path since they either have to be installed early in the

Machine Assembly Schedule, or components which are required on-site at an early stage

for other reasons (for example the cryostat upper, which may be required for use as part of

the coils cold test facility, and which may have to be available on-site ready for the delivery

of the first coils to be tested). Thus for all the items described herein, the design study must

develop the design (and all the associated documents) to the point where a call for tender

can be implemented at the end of EDA. As the overall design of the machine evolves,

crucial space requirements are emerging as. for example, remote handling access and

working envelopes are firmed up. For this reason it must be anticipated that clearances

between components may change in the light of these emerging requirements.

1.2 Technical Objectives

The major purpose of this design study is to develop the design of each

required component of WBS 2.4 to the completeness necessary to ensure adequate time

for an orderly process of call for tender, tender evaluation, contract placement and

procurement in accordance with the ITER schedule. The pressure boundaries of the

cryostat main chamber, penetrations, and vacuum vessel pressure suppression system

constitute radiological second barriers and thus have an important safety role which will

require to be assessed by failure modes and effects analysis. JCT shall be responsible for

performing such analysis.

Designs have to be developed in a way that meets all the requirements of the

GDRD and the DDD. In compliance with Section 3.6 of the GDRD, the Task performer

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JAERI-Tech 99-026

shall institute a quality assurance program that shall ensure that all activities of the design

study are conducted in accordance with the ITER project management plan.

13 Outline of the Design Study

13.1 Cryostat Main Chamber (WBS 2.4.A)

The design study includes the following items :

1) An appraisal of the grade of stainless steel proposed for the cryostat (304L) in view of

the requirement for withstanding contact by low temperature helium under accident

conditions, and a recommendation for material to be used.

2) An initial review of the reference design to confirm strength and buckling stability

margin. This should include the following load case combinations (l)atmospheric

pressure load with internal vacuum (with PF coil quench EM loads superimposed),

(2)design basis accidental internal pressure and thermal traction stresses resulting from

the design basis loss of magnet cooling helium into cryostat vacuum.

3) A design of lower head segmentation compatible with the solution adopted for the

maintenance of the lower PF coils.

4) A design for partitioning the inter wall region of the cryostat cylinder and heads into 10

volumes each (30 volumes in total) to assist in leak location.

5) A fabrication method study to confirm the cost-effectiveness of the reference design.

This should aim to maximize the amount of prefabrication and vacuum leak testing

performed at the vendor's shop, within the constraints of transportation and receipt at

the ITER site (as defined in the GDRD document reference S 10 GDRD 2 95-02-10

F1.0). Additionally the facilities required for the final on-site prefabrication and

vacuum leak testing of the cryostat upper and lower heads and cylinder (before

installation in the pit, for the lower head or use as part of the coils cold tests facility for

the upper head) should be defined, including the size of building and crane capacity,

and transportation means from the facility to within the reach zone of the Tokamak hall

crane.

6) Industrial cost estimates shall be obtained for inclusion in both the detailed design

report (December 1996) and the Final ITER Design Report (January 1998). An

outline fabrication procedure is to be complied for use in the Detailed Design Report,

including all sketches necessary to illustrate the methods involved, for both shop and

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JAERI-Tech 99-026

on-site fabrication, together with an associated time plan which will be used to ensure

that adequate lead times are allowed in the ITER overall planning schedule. The

fabrication procedure will also be used in the final ITER design report, updated to

reflect any evolution from the detailed design report.

7) Design of any reinforcement needed to the Cryostat walls to allow the attachment of

Tokamak lateral supports if it is decided that is to be a requirement.

8) Design of the upper head with the necessary degree of segmentation and to

accommodate the cryocondensation pump used to establish ultra high vacuum

conditions in the cryostat before coils cool-down.

9) A stress analysis of the Cryostat main chamber in its final configuration, including

buckling stability, as comprehensive as required by the adopted Design Code.

10) An adequate set of drawings and all associated documentation to enable a timely

implementation of a call for tender exercise at the end of EDA (the major elements of

this system have to be installed in the Pit at an early phase of the Tokamak installation).

13.2 Cryostat Penetration (WBS 2.4.B)

The cryostat penetrations comprise all apertures in the cylinder and the upper and

lower heads. The design study for penetrations includes the following items:

1) Design of reinforcements required for strengthening all apertures.

2) Design of all bolted and welded connections for penetrations.


implementation of a call for tender exercise at the end of EDA (the major elements of

this system have to be installed in the Pit at an early phase of the Tokamak

installation).

1 3 3 Vacuum vessel Pressure Suppression System (WBS 2.4.E)

Together with associated thermo-hydraulic analysis, the conceptual design of the

Vacuum Vessel Pressure Suppression System is being performed under Task Number N 24

TD 03 95-05-02 FJ. When this conceptual design is delivered, the following activities will

be performed in the task according to the technical specification provided by the JCT

1) Detail design of the complete system including: Suppression Tank and internalpiping

and flow distribution system; associated vacuum roughing system and connection to

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JAERI-Tech 99-026

the Tritium Plant; relief pipes connecting the Suppression Tank to the Vacuum

Vessel, including all expansion bellows necessary; rupture discs and I&C as identified

during the Conceptual Design Task N 24 TD 03 95-05-02 FJ.

2) Stress analysis of the Pressure Suppression System in its final configuration

including the worst scenario load case combinations of pressure and fluid inertia

loading that will be specified during Conceptual Design Task N 24 TD 03 95-05-02

FJ.


implementation of a Call for Tender exercise at the end of EDA (the major elements

of this system have to be installed in the Pit at an early phase of the Tokamak

installation).

However, in 1997, the basic design concept of cryostat main chamber and

cryostat penetration was changed from double-wall configuration to the single wall

type. For this reason, the activities on cryostat main chamber and cryostat

penetration were focused on the structural assessment from a viewpoint of fabrication

and assembly according to the agreement with the JCT.

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JAERI-Tech 99-026

2. Cryostat Design Description

2.1 Introduction

The cryostat is a cylindrical vessel that includes in-vessel components such as

vacuum vessel, toroidal and poroidal coil, divertor and blanket. And it provides

adiabatic vacuum for the superconducting coil, and forms parts of second

confinement barrier for tritium containment. The pressure inside the cryostat is

kept below 10 Pa with respect to adiabatic vacuum for the superconducting coil,

and the cryostat prevents thermal invasion applied to the superconducting coil and

their support structures that operated at cryogenic temperature, 4 K.

This report describes the major results obtained by the study on the following

design items. Since the basic structure of the cryostat has been changed by the

JCT from double-walled structure to a single-wall type in 1997, the design

activities were focused on the study of single-walled cylinder vessel

-Cryostat detail design

-Fabrication and construction plan

-Remote cutting and rewelding plan

-Vacuum pumping plan

2.2 Design Conditions

According to following conditions, we performed the detail design, the

investigation of fabrication/ construction plan and remote cutting/rewelding

plan of the cryostat.

2.2.1 Design Pressure and Design Temperature

Operating conditions concerned with the cryostat among several ITER

operating conditions are shown in Table 2.2-1. In the cryostat design,

following two condition are selected as significant operating conditions:

Operating Condition Case 3: Normal Condition/Operation

Operating Condition Case 6: LOCA/LHe Leakage

Since the electromagnetic load that is applied to the cryostat during PF coil

quench and plasma disruption is much smaller than external pressure,

electromagnetic load was neglected.

- 5 -

Table 2.2-1 Design Pressure and Design Temperature

I

I

Operating Conditions

Normal

Condition

s

LOCA

Start

Shutdown

Operation

Operation

(PF coil quench)

Operation

(Disruption)

LHe Leakage

Water Leakage

Case

No.

1

2

3

4

5

6

7

Pressure

Inside Cryostat

From 1 atm to

vacuum

From vacuum to

1 atm

1 atm

1 atm

1 atm

0.2 MPa

0.2 MPa

Outside Cryostat

1 atm

1 atm

1 atm

1 atm

1 atm

1 atm

1 atm

Temperature

300 K

300 K

300 K

300 K

300 K

(125 K)

(340 K)

Remarks

73

o3"toI

o

note : ( ) is temporary value

JAERI-Tech 99-026

2.2.2 Seismic Load

For the normal operation, we considered the following design seismic

intensity.

Horizontal Direction : 2.828 x 0.2G

Vertical Direction : 2.2 x 0.2G

(Peaking Factor x SL-2)

The combination of the seismic load and load applied during LOCA or PF

coil quench is not considered in the study because of its low probability.

2.2.3 Material and Allowable Stress

(1) Material: SUS304L

(2) Allowable Stress

The allowable stress based on the ASME BOILER AND PRESSURE

VESSEL CODE Section VIII is shown in Table 2.2-2.

Table 2.2-2 Allowable Stress

Unit (MPa)

Material

SUS304L

Operating

Condition

Normal

Operation

LOCA*1

Allowable Stress Intensity

Primary Stress

Pm

115

138

PL + Pb

172

207

Primary + Secondary

Stress

PL + Pb +Q

345

345

Remarks

including at

Earthquake

Note : Considering Stress Intensity Premium Factor (k=l .2)

Explanation of Symbols:

P m ; General Primary Membrane Stress

PL ; Local Primary Membrane Stress

Pb; Primary Bending Stress

Q; Secondary Stress

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JAERI-Tech 99-026

2.2.4 Other Design Requirements

(l)During exchanging in-vessel equipment, the structure of upper and lower

cover shall be able to be cut and rewelded remotely.

(2)Gas pressure in the cryostat shall be less than 10 Pa.

(3)Cryopump shall be installed outside of the cryostat.

(4)Site conditions

Construction conditions are listed below:.

-Capacity of Tokamak building crane shall be 750 ton x 2.

-Distance between the cryostat and the bioshield shall be 500 mm.

-After construction, the structure shall be subjected to a pressure and

leakage testing.

(5)Considering the site conditions, dimensions of shop blocks of the cryostat

shall be the following dimensions.

-Width less than 14m

-Height less than 6m

-Length less than 19m

-Weight less than 11.77 MN( 1200 ton)/l component

Q

JAERI-Tech 99-026

2.3 Cryostat and Penetration Design

2.3.1 Structure and Dimensions of Cryostat and Penetrations

a. Cryostat

Basic structure of the cryostat and other components, and their dimensions

are shown in ATTACH. 1-1

The detail structure and dimensions of the cryostat are shown in the figures

listed below:

-Cylinder ATTACH. 1-4

-Lower Cover ATTACH. 1-5,1-6

-Upper Cover ATTACH. 1-7

b. Penetrations

The specifications of each penetrations and ports are summarized in

ATTACH. 1-2.

The arrangement of penetrations and ports is shown in ATTACH. 1-3,

General development drawing.

The detail structure and dimensions of penetrations are shown in the

attachments listed below:

-Equatorial Port Detail ATTACH. 1-17

-Divertor Port Detail ATTACH. 1-18

-Upper Port Detail ATTACH. 1-19

-Feedthrough for Coil Detail ATTACH. 1 -20

-Others ATTACH. 1-21 ~ 1-23

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JAERI-Tech 99-026

c. Openings

In the cryostat, their openings are arranged for inspection and

maintenance of the equipment installed in the cryostat. Opening/closing

shall be connected with flanges. The airtightness shall be ensured with seal

welding (lip seal).

The arrangement of the openings is shown in above table of penetrations

and ports, and general development drawing.

The detail structure and dimensions of the openings are shown in the

attachments listed below:

-Upper Cover Central Port Detail ATTACH. 1-14

-Upper Cover RH Port Detail ATTACH. 1-15

-Lower Cylinder RH Port Detail ATTACH. 1-13

-Lower Cover RH Port Detail ATTACH. 1-12

d. Ring Pedestal and CS Support

The major function of the ring support is to support the gravity load of

the vacuum vessel and the lower cover.

The CS support is used for the assembly of the central solenoid coil.

The detail structure and dimensions of the ring pedestal and the CS support

are shown in ATTACH. 1-24.

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JAERI-Tech 99-026

2.3.2 Mechanical Study of Cryostat and Penetrations

We confirmed the analytical results described in the JCT analysis report of

mechanical reliability of cryostat and port penetrations based on the ASME

Code Sec.VIII (Div. 2, Appendix 4), which is called " design by analysis".

In this code, the evaluation of compression stress has limitation and strength

against outernal pressure is requested to be evaluated by rule.

2.3.2.1 Summary of FE analysis results

Followings are the summary of FE analysis of cryostat described in the report

"DDD 2.4 Appendix G Cryostat atructural analysis".

(1) Design Code and targets of the analysis

a. Design Code

• ASME Sec. VIII Div. 2

b. Targets of the analysis

• Cylindrical section

• Inner section of the lower lid

• Outer section of the lower lid and main skirt

• Main section of the top lid

• Inner top small lid

• Main port expansion joint (bellows)

(2) Conditions of the analysis

a. Analysis code

• ANSYS Version 5.3

b. Analysis model

3D FE model (Fig. 2.3-1 ~ 2.3-6)

c. Loading conditions

• Dead weight

• Test pressure (internal pressure)

• External pressure

• Seismic load

The combinations of the loading conditions are shown in Table 2.3-1

d. Allowable stress

ASME Sec. VIII Div. 2 is referred

For the loading condition of category IV which is shown in the Table

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JAERI-Tech 99-026

2.3-1, ASME Sec. Ill Subsection NE (Class MC components) is referredbecause of no description in the ASME Sec. VIII Div.2.Table 2.3-2 summarizes allowable stress for each loading condition.Table 2.3-3 shows allowable stress for each material,

e. Analysis cases

• Static stress analysis

• Buckling analysis (linear, non-linear)

• Seismic analysis

(3) ResultsThe results are summarized in Table 2.3-4. It is concluded that stressesincluding buckling are below the allowance.

(4) Comments to the FE analysis resultsa. It is necessary to evaluate the effect of initial error of assembly in detail

as a further discussion.

b. We would propose that the buckling should be evaluated with ASMECODE CASE (N-284) "Metal containment shell buckling designmethods, Class MC, Section III, Division 1".

c. The ASME CODE CASE has limitations to apply, as follows.•Di /R i<0 .1• Openings are fully reinforced according to code rules•R i / t<1000Where,Di: inner diameter of opening

Ri: diameter of main vessel

t : thickness of the vessel shell

In the case of the cryostat,

Di / Ri = 4202 mm / 36480 mm = 0.123 > 0.1 NGAr = 9.0 x 104 mm2 < A= 7.1 x 104 mm2 NGRi/1 = 36480 mm/50 mm = 730 < 1000 OK

Where,Ar : Reinforcement area required for opening

A : Area available for reinforcement

The present design does not satisfy all limitation to apply the CODE

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CASE.

d. It is designed to use expensive low carbon steel for frame structure on

the top lid. It would be proposed to use general carbon steel.

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Fig. 2.3-1 Finite element model for cylindrical section of cryostat

Fig. 2.3-2 FE model of the inner section of the lower cryostat lid

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JAERI-Tech 99-026

Lra. O.XMP« tan 1 id l o . J a*1

•;1tr'..:-.-4l-Jl-/:-V.-..-:-V-:^^y.-VVv:

• . " • S w i m ' . .•-•••-'".•.•'.•>•••,'^>';;X'

.-•orr**:1.'.

Fig. 2.3-3 FE model of the inner section of the lower cryostat lid and main skirt

Fig. 2.3-4 FE model of the main section of the top lid

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JAERI-Tech 99-026

Fig. 2.3-5 Inner top small lid, FE mesh

Fig. 2.3-6 Shell model for divertor port expansion joint

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JAERI-Tech 99-026

Table 2.3-1 Load combination

Weight+Test pressureWeight+External pressureWeight+External pressure+Earthquake SL-1Weight+External pressure+Earthquake SL-2Weight+Helium and Water Ingress (internal pressure)

TestIII

IVIV

Table 2.3-2 Allowable stress for each loading condition

.y Category "PmPLPm +PbPL+PbPL+Pb+QPL +Pb +Q +F

0.8 Sy

Note 1

Sm1.5 Sm1.5 Sm1.5 Sm3 Sm

Sa

' :r-U: %1.2 Sm1.8 Sm1.8 Sm1.8 Sm3 S m

Sa

' **1V (Nomyr~$~Sf

1.5 Sf1.5 Sf1.5 Sf

1.5Sy1.5Sy1.5Sy

Note 2Note 2

1. Note 1: not to exceed 1.35Sy when Pm<.67Sy, or, 2.15Sy-1.2Pm when Pm>.67Sy2. Note 2: no evaluation required3. Note 3: Values in the left are for regions which are continuous and integral.

Values on the right for regions which are not continuous and integral.

Where:

Pm is the calculated primary general membrane stress intensityPL is the calculated primary local membrane stress intensityPb is the calculated primary bending component of stress intensityQ is the self-limiting secondary component of stress intensityF is the increment to all types of stress due to a notch concentrationSy is the yield strength tabulated in ASME, section II, part DSm is the design stress intensity value tabulated in ASME, section II, part DSf is defined as 85% of the general primary stress limit defined in Appendix F.

This is defined in F-1331.1 where it amounts to the lesser of 2.4Sm and 0.7Su foraustenitic steel, or 0.7Su for ferritic materials.

Su is the tensile strength tabulated in ASME, section II, part DSa is the allowable alternating stress obtained by the fatigue curves in article 5-100,

Section VIII, division 2.

- 17 -

JAERI-Tech 99-026

Table 2.3-3 Allowable stress for each material

Material S& -&FormNom.CompositionSy[MPa]Su [MPa]Sm [MPa]Sf[MPa]

' Type 304 »'^ *Plate18Cr-8Ni206517137279

Type 3041 - -Plate18Cr-8Ni172482115234

^~SA-533'~ -PlateMn-.5Mo-.25Ni572690229410

- 18 -

ID

I

Table 2.3-4 Summary of Cryostat Structural Analysis(DDD 2.4 APPENDIX G CRYOSTAT STRUCTURAL ANALYSIS )

Evaluation Parta

1. Introduction

2. Analytit of Cryottat2. 1 Loading Conditionl2. 2 Crit«rii2. 3 Matariali and

Allowable Strait L .v . l .2. 4 Static Analytia of

Cylindrical Saction

2. 5 Static analylia ofirmar Bottom Lid

2.4.1.

2.42

O Z L Z

2.4.2.3

1.43

iiSZ.

2.4.4

2.4.4.1

2A*J_

2.4.4.3

2.4.4.4

2.5J.

2.5.3

2.5.4

Analy.la

FE Modal Da»cription

.§5i?.Gll!l.?I.?.f.!yf?._tS.^

,Wil?ail.!n!!l.'.ltS?..Jff ithoutiniii"«l"diformaljontEffacta of initial dittortiona

Looal modal of aguatoritl and divartoportt ragjonTaat Prattura Loading Condition

Local analytic of aqualoriaf andd.ivJ.SK-E?.!t!.KJBS!!Local modal of RH lowar port

Bucklinjr Analyait

Ei^anvalua anal^tia on 2 aaotor mod*

Eifanvalua analyw* on 5 taotor modi

Non linaar alastie larfa daftaotionbucklinj analyaiaNon linoar inalaatio larga daflactionbueklini analysit

FE Modal Daacription

Ejittmil Prauura Load

Taat Prrnwuf Loading Condition

Bucklinj Analytit

Analyals modal

3D 9* modal

30 9 ' modal

3 0 30* mo'dai

3D partial modal

3 0 partial modal

3 0 partial modai

3D 36" modaK2>aotorJ_

30 90" moSjlfSiactorl

3D 36" modaiifitaotor)

3D 9'" modal

3D partial modal

3D partial modal

36TartiaJ m,^

3D partial modal

Analyaia Condition

Boundary Condition.Bottom; raatraint without rotationaround toroidal direction radial direction.

Toj;'r^ai"dTtDl<icamant U •ama'a. flatTd.Vortical bad: 4.ISMN

Extamal praaaura: 0.1 MPaSalfWalght

Iniliafdl«form.tion±l5mm with '72*~Equatorial maridional initial daformation ±2.Smm

faat praaaura tint.mal pra»«ur«) 0.1MP.

nitial daformation± ISmm

Initial daformation± 15mm

Extamal prataure

Intamal praiiura (taat praaaurai

R.«ult.

All strata lavalt ara within ailowabla.

Initial dafotmation doaa not affact on tlrata lavalt.

ATtiir«rra^tlirt"wii5^^^^

All ttratt lavalt ara within allowabla.

P.u.sk!!!?.i..m.*r«i!i.y§

9ucklin| mar^n 7.6

Buoklin| margin 9~8.5

3ucklin| margin 3~3.5

All strati lavalt aro within allowablo.

All ttratt lavtlt ara within allowabla.

3uckling marfin 65

Ramarkt

Mo considcrinc of waldinf d*foarvttJon

>

o

Oto

JAERI-Tech 99-026

VI

13 p

l l

u 5?S Z

c2 fi

- 20 -

Table 2.3-4 Summary of Cryostat Structural Analysis (3/3)(DDD 2.4 APPENDIX G CRYOSTAT STRUCTURAL ANALYSIS)

Evaluation Parta

2. 10 Other Loading Condition

3. Analysis of Main Pert* Bellov

4. Analysis of Vacuum V O I M IPressure Suppression Tank

5. Anajviitof Rn tP.(* . . ta l

2...2.B

2.10.1

s3.13.23.3

343.4.1342 ~3.43

4.14.2

i.3

4.4

5.1 "5.2

5.3

5.4

Analyala

Top lid sholle 5L-I.SI-2

Alternative study : Analysis of oylindswith the addition of toroidal M s

EM Load.

Individual Loadinf ConditionsCombination of LoadsCumulative Fatigue Evaluation

finite Element EvaluationsLJnsar Elaatio AnalysisLinsar Element EvaluationLarge Daflsetion Contaot Analysis

.oadim Conditions and CombinationsSriteria and Stress Allowabla

Static Strass Analysis

Suckling Analysis

.oading Conditiona and CombinationsCriteria and Stress Allowabla

Static Stress Analysis

Buckling Anslysis

Analyala modal

r

1/2modsl

3D modsll 1 full sector)

30 model(1 full saetar)

30 mod.K l/2modal)

3Dmodol(1/2model)

Analysis Condition

S.ifwoiBhtPrassuradntomat, external, hydrostatio)EarthquakeLoo*

Normal operitinj loadEarthqualia

RssuHs

SL-1 peek stress Isvals 20% hlfhsr than normalSL-? peak stress lavals 50% hitler than normalAll etrsu lavals are within allowable from statioanalysis.

Tha peak pressure by EM load is 20 timaa lasa than thanormal axtamal pressure (0.1 MPa). EM loads acting onCryostat can be considered naiHv'bla.

Total u . a » factor is below 1.

Tha divartor j w t axpansiorjolnts has snou rh bucklingm»r«in.

All stress lavals are within allowabla.

Buckling martin (.Of

Tha allowabla stress is axoaadad In tha uppar part oftha ring padastal durina^saismio events.Local reinforcements ia naoetsary.

Bucknnf. margin l9(normal oparatinf)Buoklim mariin 3.85(normai oper.um + SL- I )

Remarks

Tha distribution and direction ofeleotromaanetio loads do not consider.

i—ii

o

O

JAERI-Tech 99-026

2.3.2.2 Evaluation by Formula

The mechanical strength of cryostat for the external and internal pressure are

evaluated according to the ASME Boiler and Pressure Vessel Code Section-VDI

Division-2 Article-D3.

(l)Study of required thickness of cryostat shell

a. Mechanical strength for internal pressure

The minimum required thickness of the cryostat shell is

PRt = S-0.5P

Where,

t; minimum required thickness of the shell

P; internal pressure (considering LOCA) =0.1 MPa

R; inside radius of the shell = 18195mm

S; membrane stress intensity limit = 115MPa (SUS 304L, at room temp.)

So the minimum required thickness is0.1x18195

t = = 15.9mm115-0.5x0.1

This result is thinner than the present shell thickness of 40mm. Therefore, the

mechanical strength of the cylinder for the internal pressure satisfies with the

ASME Section-VHI Division-2.

b. Mechanical strength for external pressure

The maximum allowable external pressure is evaluated as follows.

Case 1: thickness of shell is assumed to be 40mm

L 1500 nnAt= = 0.041

D o 36470

Do _, 36470 _0]2

t 40

Where,

Do; outer diameter of shell = 36470mm

L ; distance between stiffening rings = 1500mm

- 22 -

JAERI-Tech 99-026

According to the FIG. G shown in the Subpart 3, "Charts and Table for

Determining Shell Thickness of Components under External Pressure" of

ASME B&PV Code, Sec. II Part D, the factor "A" is as follows;

A = 0.0013

Then, from the FIG. HA-3, "Chart for the determining shell thickness of

components under external pressure when constructed of austenitic

steel(18Cr-8Ni-0.0035 maximum carbon, type 304L)" of ASME B&PV

Code, Sec. II Part D, the factor "B" is determined.

B = 9200

Therefore, the maximum allowable external pressure Pa is calculated as

follows;

4B 4 x 9200a ~ 3 ( D 0 / t ) ~ 3x912

= 13.45psi= 0.09MPa < O.lMPa

The maximum allowable external pressure, Pa, is smaller than the design

external pressure of O.lMPa.

If the distance of stiffening rings is assumed to be shorter, the maximum

allowable external pressure is same as the above result due to that L/Do is

under 0.05.

Case 2: thickness of shell is assumed to be 50mm

= o.O41D o 36480

t 50

Where,

Do; outer diameter of shell = 36480mm

L ; distance between stiffening rings =1500mm

According to the FIG. G shown in the Subpart 3 of ASME B&PV Code Sec.

II Part D, the factor "A" is estimated as follows;

A = 0.002

From the FIG. HA-3 of ASME B&PV Code Sec. H Part D, the factor "B" is

determined.

B =10000

- 23 -

JAERI-Tech 99-026

Therefore, the maximum allowable external pressure Pa is calculated as

follows;

4B 4x1000Pa = —. r- =

3(D0 /1) 3 x 730

= 1826psi

= 0.125MPa>0.1MPa

The maximum allowable external pressure Pa is larger than the design

external pressure of 0.1 MPa. The moment of inertia of the stiffening ring

will be studied based on the shell thickness of 50mm.

(2)Mechanical strength of the stiffening ring

The moment of inertia of the ring is evaluated under the condition of shell

thickness of 50mm.

Case 1: the size of the stiffening ring is assumed to be T section of

T350»300*60/20.

The required moment of inertia on the combined ring-shell section Is is as follows;

D0*L.(t + A. /L, )A10.9

364802 x 1500 x (50 + 238 x 104 /1500) x 42 x 10""= i ' = 5.07 x 109mm"

10.9

Where,

As; cross-section area of the stiffening ring = 2.38 X 104mm2

Lj; length between stiffening rings = 1500mm

According to the FIG. HA-3 in the Sub chart 3 of the ASME B&PV Code

Section II, the factor "A" is

A = 4.2X10'*

Here, the factor "B" is calculated as follows,

p _ 3 [ P P ° 1 - 3 x f 0-'*36480 I4[_t + A , / L , J 4 [_50 +238xl0 4 /1500J

= 4134MPa = 6025psi

- 24 -

JAERI-Tech 99-026

If the dimensions of the cross section

are shown in the figure on the right,

the available moment of inertia is

calculated as the following procedure.

The effective width of the shell W isW = i.ioJD0T,

= U0V36480 x 50 = 1486mm

Where, Ts is the shell thickness of

50mm in the current design.

Moment of inertia is summarized as follows,

®

total

A(X104mm2)

7.43

2.38

9.81

y(mra)

25

327—

I(X108mm4)

0.1548

1.7985

1.9533

A A ^ X I O 8 ! ™ 4 )

3.9594

12.4810

16.4404

The available moment of inertia is= 1-9533 x 10* + 1 6 4 4 0 4 xy ) 108mm4

Where,

A y; distance between the center of the components

e; the gravity center of shell-ring section7.43xl04x25 + 238xl04x327 „„

e = ; = 98mm9.81x10*

The available moment of inertia I is smaller than the required moment of inertia Is.

Therefore, the distance of stiffening rings are re-arranged and calculated.

Case 2: length between stiffening rings. Ls =1000mm.

(other size of the stiffening ring is same as the case 1)

Is = 3.33xl09mm4

I=1.66Xl0 9 mm 4

The available moment of inertia I is smaller than that of the case 1 due to that the

effective width of the shell is smaller.

Case 3: the shape of the stiffening ring is flat and the distance of stiffening rings L is

1100mm

Is = 3.65X109mm4

- 25 -

JAERI-Tech 99-026

= 3.76X109mm4

The available moment of inertia I is larger than the required moment of inertia Is

These dimensions and the pitch of stiffening ring are summarized as follows,

Dimensions : Flat plate thickness 40mm

width 700mm

Pitch: 1100mm

(FB40*700)

The calculation results are shown in Table 2.3-5.

Table 2.3-5 Summary of Calculation

CaseNo.

1

2

1

4567

g

Thicknessof theshell

5050505060

6070

70

Stiffening ring(mm)

Dimensions

CT350*300CT350*300

FB40*700'FB40*680FB40*700FB40*670

FB40*700

FB40*650

Pitch

15001000

Z HOOP1000120010001250

1000

Moment of inertia(mm4)

Is

5.07 X109

3.33 XI09

3.30 X109

4.03 XI09

3.39 X109

4.24 X109

3.29 X109

I

1.84X109

1.66X109

3.411 XO9

4.08X109

3.491 XO9

4.32X109

3.401 XO9

Evaluation

X

X

Ooooo

CT: Cut Tee

FB: Flat Bar

- 26 -

JAERI-Tech 99-026

Considering the balance between the shell thickness and dimensions of the stiffening

ring, the following dimensions of each part are determined.

• Thickness of the shell : 50mm

• Dimensions of the stiffening ring : Flat plate Thickness 40mm

Width 700mm

• Pitch of the stiffening ring : 1100mm

(3) Conclusions

The cryostat structure is assessed by the formula specified in the ASME B&PV

Code Sec.VDI Div.2. The conclusions are summarized below.

(l)The thickness of the shell requires 50mm as the external pressure vessel.

(2)The increase of the shell thickness does not affect the size-down of the

stiffening ring.

(3)According to the present cryostat design which are proposed by JCT, the

thickness of upper and lower flexible joints are 20 mm. Some parts of upper and

lower flexible joints will require the thickness of over 20mm.

(4)The stiffening ring needs to change the shape from the T section of 350mm to

the flat plate with the width of 700mm. In this case, the interference between the

stiffening ring and some internal components may be a problem.

(5)The number of the stiffening rings should be increased from 13 to 21.

(6)The design code for evaluation for the external pressure utilized in this design

is the code for the general cylindrical shell vessel whose opening is sufficiently

reinforced. Therefore the parts with many openings (near the equatorial and

divertor port) will require detailed stress analysis.

- 27 -

JAERI-Tech 99-026

2.4 Upper/Lower Cover Remote Cutting and Rewelding Equipment

2.4.1 Upper Cover Remote Cutting and Re-welding Equipment

The cutting and re-welding location of the upper cover are considered as

follows:

(1)CS coil opening for CS coil maintenance

(2)Upper openings of cryostat for vacuum vessel and poroidal coil 2, 3 (PF2.

PF3) maintenance

In the case of exchanging the CS and PF coils, the openings are cut at each

flexible joint of the upper cover.

We studied the remote cutting and rewelding procedure considering the

following conditions.

-Bioshield over the upper cover shall be removed

-Upper cover (truss portions) shall be accessible to person.

-Opening guides, supports and guide rails shall be pre-installed

during construction.

-The covers shall be removed by using Tokamak building crane and

special lifting devices and be transferred to appropriate places.

a. Remote Cutting and Re-welding Procedure

The conceptual procedure of the upper cover cutting and re-welding is

summarized below;

Cutting/Removal procedure;

Step 1 : Set the remote handling devices unit

Step 2 : Cut the upper cover and dimension measurement

Step 3 : Remove the upper cover

(Repair of CS coil)

- 28 -

JAERI-Tech 99-026

Repair procedure;

Step 4 : Install the upper cover blocks and set the remote device units

Step 5 : Weld the upper cover blocks, and perform the welding nondestructive

examination

Step 6 : Bolt the test cover and perform the local leakage test.

The maintenance equipment for the upper cover is shown in Table 2.4.1.

The outline of test cover for the local leak test is shown in Figure 2.4.1.

- 29 -

toO

TRUSS TRUSS

f HANDLING LUQ

LOCAL TEST COVER [1 _ | \ / j ~ "

—1INNER COVER 11

CS OPENING <

~1 1 V 11 REMOTE DEVICE

• ROUTE

UNIT

)F UNIT FOR INNER >PEN1NC

i

OUTER COVER

TFOR CENTRAL SOLENOID COIL GUIDE PLATE

FOR CRYOSTA.T CYLINDER SHELL

1 T

IK)OU

UTE OK UNIT l*)U

LOCAL TEST COfl

UVER

REMOTEDEVICE UNIT

X1 ''' T l

GUIDE RAILSUPPORT

BIO-SHIELD

Notes ; Attachments to be welded at construction.• CS OPENING

<D HANDLING LUG© BRAKET OF TRUSS BEAM(3) GUIDE RAIL

• CYLINDER SHELL(D GUIDE RAIL SUPPORT AND RAIL@ GUIDE PLATE(UPPER AND LOWER)

•LOCAL TEST COVER<D O-RING COVER SHEET

NAME OF EQUIPMENT

LOCATION

DESIGN CONDITION

OPERATING CONDITION

TYPE OF EQUIPMENT

MAIN MATERIAL

WEIGHT

ACCESSORY

NOTES

REMOTE HANDLING DEVICE UNIT

CS OPENING AND UPPER COVER

EQUIP. CLASS

TEMPERATURE

TEMPERATURE

-

EQUIP. NO.

QUANTITY

CORROSION

MARGIN

—

-

ROOM TEMPERATURE

ROOM TEMPERATURE

CARBON STEEL

MONITORING

LIGHTING

MEASURING

CLEANING

ITV, CCD camera

1 DRTVTNfi SYSTEM

Driving Gear ; Rack & PinionSpeed ; Max. 1200 m/min.

2. CUTTING DEVICE UNIT

Type ; Laser Cutting

Speed; 10 m/sec.

3. REWELDING DEVICE UNIT

Method : Narrow Gap TIG or Laser Welding

Speed; 20~100 na/min.

4. WELDING NONDESTRUCTIVE EXAMINATION DEVICE UNIT

Method; UT5. BOLTING DEVICE UNIT

Type; Power RenchTorqu; 5O~80 N-m

>

—i

o3-

oto

Table 2.4-1 Maintenance Equipment for Upper Cover

JAERI-Tech 99-026

<Upper Cover Remote Cutting and Rewelding Procedure

and Equipment for Maintenance>

Step 1 : Install the remote handling device units

(l)Transport the remote bolting device units

(2)Lift down the remote bolting device units through the space between the cryostat

and the biological shield

(3)Set the bolting device unit at the guide rail pre-installed on cylinder in order to

loosen the bolts of test cover for leak test

(4)Remove the test cover

(5)Remove the bolting device unit

(6)Set the cutting device unit on guide rail

Step 2 : Cut the upper cover and dimension measurement

(l)Cut the upper cover

(2)Measure dimensions of the cutting edges

Step 3 : Remove the upper cover

(l)Lift up the upper cover with special devices and the Tokamak building crane

(2)Transfer the upper cover to appropriate place.

Step 4 : Upper cover and welding device units installation

(l)Install the upper cover

(2)Set the test cover

(3)Set the welding device unit and examination device unit

2.-25Step 5 : Weld the upper cover and perform welaing nondestructive examination.

(1) Weld the flexible joints

(2)Perform the welding non-destructive examination

(3)Remove the welding and examination device units

Step 6 : Bolt the test cover and perform the local leakage test

(l)Bolt the test cover.

(2)Perform the local leakage test


- 31 -

JAERI-Tech 99-026

TIGHTENING BOLT

O RING

O RING

TEST COVER

TIGHTENING BOLT

FLEXIBLE PLATE

> TEST COVER

SLIT GUIDE

A VIEW A

SEAT OF COVER

OUTLINE OF TEST COVER

• BOLTTING AND O RING SEAL TYPE.

• SEATS OF COVER ARE WELDED ON FLEXIBLE PLATE

AND PROVIDED WITH GUIDE FOR REMOTE

HANDLING UNITS.

• TEST COVER IS BELLOW TYPE.

SEQUENCE OF MAINTENANCE

(D SET ON O RING

® UP/DAWN AND POSITIONING OF COVER

(E> TIGHTEN BOLTS

® LEAK TEST

FIG. 2.4-1 TEST COVERFOR LOCAL LEACKAGE TEST

- 32 -

JAERI-Tech 99-026

2.4.2 Design of Lower Cover Remote Cutting and Re-welding Equipment

The cutting and rewelding location of the lower cover are considered as

follows.

(1) Outer opening for PF5,6 maintenance

(2) Inner opening for PF7 maintenance

In the case of the manintenance of these coils, the openings are cut at each

flexible joint of the lower cover.

We studied the remote cutting and rewelding procedure considering the

following conditions.

-Equipment under the lower cover shall be removed.

-Suppression tank shall be removed.

-Shield blocks and the lower covers shall be transferred with a special

lifter.

-Bio-shield shall be removed by being separated to blocks.

-The cover shall be contained in mid basement floor.

-The guide rail shall be pre-installed during initial assembly.

a. Remote Cutting and Rewelding Procedure

The conceptual procedure of cutting and rewelding of the lower cover is

summarized below:

Cutting/Repair Procedure:

Step 1 : Remove the bio-shield.

Step 2 : Set the remote handling device unit.

Step 3 : Cut the lower cover and perform dimension

measurement

Step 4 : Remove the lower cover

(Repair of PF coil)

- 33 -

JAERI-Tech 99-026

Repair Procedure;

Step 5: Install the lower cover and set the remote welding device unit

Step 6 : Weld the lower cover and perform nondestructive examination

Step 7 : Bolt the test cover and perform the local leakage test

Step 9 : Install the bio-shield

The maintenance equipment for the lower cover are shown in Table 2.4-2 and

2.4-3.

- 34 -

LOWER COVER RING PEDESTAL

SHIELD BLOCK

SHIELD BLOCK

GOO 1

MID. BESEMENT FLOOR

RAIL FOR LIFTER

TOROIDAL MOVER

i— LOWER COVER

SHIELD BLOCK

GU1DE(SHIELD) PLATE

REMOVABLSHIELD BLOCK -,

=3SETTINGBRACKETET -J 1

SECTION. A SECTION B

NAME OF EQUIPMENT

LOCATION

DESIGN CONDITION

OPERATING CONDITION

TYPE OF EQUIPMENT

MAIN MATERIAL

WEIGHT

ACCESSORY

NOTES

BIO-SHIELD BLOCK carrier

under the cryostat

EQUIP. CLASS

TEMPERATURE

TEMPERATURE

EQUIP. NO.

QUANTITY

CORROSION

MARGIN

TBD

ROOM TEMPERATURE

ROOM TEMPERATURE

Movable lifter

SUS316L / SS400

20 ton

MONITORING

LIGHTING

RAIL

ITV, CCD Camera

Main function

1.Lifter

(1) Driving system

Maximum Speed

(2) Lifting device

Lifting stroke

2.Troidal mover

(1) Driving system

maximum Speed

(2)BSW holding system

:Rail

:0.5 m / s

:Mechanical Lifter

:Up to 6,000 mm

:Rail*I

:0.2 m / 8

:Docking pin

totooto

M : Rail is ipre-installed during initial assembly

Table 2.4-2 Equipment for Maintenance of Lower Cover Shield Block

LOWER COVER

COVER ADJUSTABLE DEVICE(HORIZONTAL FREE) V

INSTALLED GUIDE RAIL

RING PEDESTAL

I

MID. BESEMENT FLOOR

NAME OF EQUIPMENT

LOCATION

DESIGN CONDITION

OPERATING CONDITION

TYPE OF EQUIPMENT

MAIN MATERIAL

WEIGHT

ACCESSORY

NOTES

LOWER COVER LIFTER

under the cryostat bottom

EQUIP. CLASS

TEMPERATURE

TEMPERATURE

EQUIP. NO.

QUANTITY TBD

CORROSION

MARGIN

ROOM TEMPERATURE

ROOM TEMPERATURE

Mechanical lifter

SUS316L

20 ton

MONITORING

LIGHTING

ITV, CCD Camera

o3-<£><£>

IO

to

Table 2.4-3 Equipment for Maintenance of Lower Cover Shield Block

JAERI-Tech 99-026

<Lower Cover Remote Cutting and Rewelding Procedure

and Equipment for maintenance>

Step 1 :Remove the bio-shield (See Figure 2.4-2(1/10) ~ (5/10))

(1) Preparation

-Install the rail for lower cover lifter

-Set the lower cover lifter beneath the building floor

-Set the remote handling device unit on the lifter

-Remove the rail for lower cover lifter

(2) Install the rail for bio-shield lifter

(3) Set the bio-shield lifter

(4) Fix the bio-shield with the bio-shield lifter

(5) Lift down the bio-shield block

(6) Transfer the bio-shield block to the outside of tokamak pit

(7) Drive the lifter with the toroidal mover of bio-shield blocks

(8) Remove the bio-shield blocks toroidally

(9) Remove the bio-shield lifter and the rail

Step 2 : Install the remote handling device units (Figure 2.4-2(6,7/10))

(1) Lift up the lower cover lifter with the bolting and cutting device units

(2) Position the lifter using guide pins pre-installed on the lower cover

(3) Set the bolting device unit at the guide rail on the lower cover

(4) Lift down the lifter for the prevention of interfere with the cutting device unit

(5) Loosen the bolts of the test cover for local leak test

(6) Lift up the lifter and remove the test cover

(7) Install the cutting device unit on the guide rail

Step 3 : Cut the lower cover and dimension measurement (Figure 2.4-2(8/10))

(1) Cut the lower cover

(2) Measure the dimensions of cutting edges

(3) Remove the cutting device unit

- 37 -

JAERI-Tech 99-026

Step 4 : Remove the lower cover (Figure 2.4-2(9/10))

(1) Lift down the lifter

(2) Remove the lower cover in building floor

Step 5 : Install the bio-shield (Figure 2.4-2(10/10))

(1) Install the rail for bio-shield lifter

(2) Install the lifter with the bio-shield block

(3) Install the shield blocks by using toroidal mover of the bio-shield blocks

(4) Tighten the bolts of the shield blocks

(5) Remove the lifter and rail

Step 6 : Install the lower cover blocks and the welding device unit.

(1) Machining of the lower cover

(2) Attach the test cover to the lower cover

(3) Set the welding device unit on the lifter

(4)Lift up the lifter

(5)Positioning of the lifter with guide pins.

(6)Install the welding device unit on the guide rail.

Step 7 : Weld the lower cover blocks and perform welding nondestructive examination

(1) Weld flexible joints

(2) Install the welding nondestructive examination device unit on the guide rail

and perform the welding nondestructive examination.

(3) Remove the welding and welding nondestructive examination device units

(4) Lift down the lifter

Step 8 : Tighten the bolts of the test cover and perform the local leakage test

(1) Tighten the bolts of the test cover

(2) Perform the local leakage test

(3) Remove the bolting device unit

Step 9 : Install the bioshield

- 38 -

t o

RING PEDESTAL

BIO-SHIELD BLOCK

i • , ! • r I i !

•.!::!• : i ; : ' : " - : -.• i , ! • s • : I • " : = ""• , ; ' i ;i • ! : ' : : • ! • : ' . . • ' ! . '

LOWER COVER LIFTER

o

O(S3

Fig. 2.4-2(1/10) Maintenance Procedure of Lower Cover

o

I

STEP1

SHIELD BLOCK LIFTER

MI" 1

. • : ' , • I . I

• ! n ]'•'•• :; , • • J | l l | i i •• • i .

•'•••••'•• " " : • " i : ; ' : ! !

LOWER COVER LIFTER ty j• IL|.^ - I i i - i . t . • r n* I • i .1 ! Ui. H. I !• - WM ' J <ijij !• I L ' . 1 . ! ' I

LI ' , :

! ' : • • I ; , , , ! ! * - ! , [ , ' i ' i ^ ' . f 1 ' ':,;'•'-'

i;U

. is." ' - • l \ . ••1 i . ••y-.\::\-. \ - ~ ^ , . . • • . •

I-HI

O

CO

oto


SHIELD BLOCK LIFTER

;- i l l 1 - . : ! i , ! : ; ! ^ : • i ; ' 1 ' 1 ^ • • • i ; 1 >• i• • ' . . . i , ' i J J • ! ' ! • : -• • ' . ' h i ' , M . i i ,

! •'! ''!• i 1 ' ' ' ' ' ' • l l 1 1

'{!kK:]jj|< LOWER COVER LIF FER : : HJr .:!-;•• : « ?

• • j ' i i . ' , : ' V : , : i ,. ' . i J • • • • " . i - ! i . I r

soi—i

i—3O

oto

oto


STEP 1

t o

SHIELD BLOCK LIFTER

. • L I . ' ! 1

- , , ! • • ;

i l l . • ' : ! * : : •1. : '1 : •

" • ' . . • . • • • • . - l

- . 'I',, i ' \ , ; - ' - I - 1 1 ! ! ' •::•

>

m

I

CDO

toIDI

OtoO5

• . i . h . > • • • • • • V ! ' : • : ! i ! ' , , , ; • ! ! ! ' • : - '


T0P0IDALMOVER

SHIELD BLOCK LIFTER

i i j l i : !LOWER COVER LIFTER

paI

o

o


STEP 1 (9) &STEP 2

rt SHIELD BLOCK LIFTER

: ii1 l ; ! i LOWER COVER LIFTER

I

o3 -

<£)t£)I

oto01


4

SHIELD BLOCK LIFTER

?|&

LOWER COVER LIFTER

33

o

totoIo

to


O5

I SHIELD BLOCK LIFTER

LOWER COVER LIFTER

1 • M • | ! i ! , | T V i - f ! I '"'I i • 1, •" F 7 r rpp j1] f'| a B | 1 |y w i

i-rtriMHil - H1T+BilJl:T(;il'1Ul^:H:Mi+l^|lt • r -sr^r-HfiEEiJ

33

i

o

tooto


STEP 3 (D,STEP 4 (D &(

SHIELD BLOCK LIFTER

, ' I " ' !• 'f !'IT p 1 ""TVPPfnnnj?« r r T ' >L r; i * •. • , ' j , i " I •' I ' r M I f » r ' • '

! I V ' : : : ^ ^ M i l l , Wa!P4ii1*iiteilfi--ri

LOWER COVER LIFTER

. • r , i i | n - i ni|,i1;H11P d i-VH 1.1'MTH |;

33I—I

Itoo

O

r r • a I


STEP 5

00

I SHIELD BLOCK LIFTER

LOWER COVER LIFTER

fn

I—3(I)o

otoI

oto


JAERI-Tech 99-026

2.4.3 Design of Equipment for Remote Cutting and Re-welding of RH Port

The following RH ports are considered to be cut and welded.

(1) Upper Cover CS Opening for cryostat vacuum pump maintenance

(2) Upper Cover RH Port for in-vessel component maintenance

(3) Lower Cylinder RH Port for in-vessel component maintenance

(4) Lower Cover RH Port for in-vessel component maintenance

We studied the remote handling procedure considering the following conditions.

-The RH port cover shall be fixed by bolts.

-Air tightness shall be kept with lip seal welding.

-The RH port cover shall be handled with Tokamak building crane and

lifting devices

a. Remote Handling Procedure

The conceptual procedure of removal/attachment of the RH ports is

summarized below.

Removal Procedure:

Step 1 : Remove the flange bolts

Step 2 : Remove the spacers

Step 3 : Cut the lip seal

Step 4 : Remove the port covers

Repair Procedure:

Step 5 : Install the port covers

Step 6 : Weld the lip seal and perform liquid penetrant

examination(PT)

Step 7 : Insert the spacers

Step 8 : Tighten the flange bolts

Step 9 : Perform the local leakage test

The maintenance equipment for RH port are shown in Table 2.4-4(1,2/2).

- 49 -

G U I D E HAIL

REMOTE CONTROL U N I T

HANDLING JIG

FLANGE BOLT

SPACES

(FOR CYLINDER & LOWER COVER)G U I D E PLATE

OUTLINE OF GUIDE PIN

C71O

S U P P O R T FOR H A N D U N G JIG

FLANGE

DRIVING GEAR(RACK)

OUTLINE OF GUIDE PLATE

NAME OF EQUIPMENT

LOCATION

DESIGN CONDITION

OPERATING CONDITION

TYPE OF EQUIPMENT

MAIN MATERIAL

WEIGHT

ACCESSORY

NOTESDRIVING QEAR(PINION)

REMOTE DEVICE UNIT

REMOTE HANDUNG DEVICE UNIT

RH PORT OF UPPER COVER

EQUIP. CLASS

TEMPERATURE

TEMPERATURE

EQUIP. NO.

QUANTITY

CORROSION

MARGIN

ROOM TEMPERATURE

ROOM TEMPERATURE

CARBON STEEL

MONITORING

LIGHTING

CLEANING

CCD Camera

1. DRIVING SYSTEM

Driving Gear; Rack & Pinion

Speed ; Max. 1200 n/min.

2. BOLTING DEVICE UNIT

Type; Power Rench

Torqu; 350~400 N-m


Type ; Grinding


Method : TIG Welding or YAG Laser Welding

Speed; 20—100 n/min.

5. NONDESTRUCTIVE EXAMINATION DEVICE UNIT

Method ; PT

tXJ

*-}CDO

srtoto

oto

Table 2.4-4(1/2) Equipment for Maintenance of RH Port

REMOTE DEVICE UNIT

RH PORT OF LOWER CYLINDER

GUIDE PLATE

POSITIONER

TURN AFTER FIT FLANGE

GUIDE PLATEOUTLINE OF HI TIDE PLATE

SHIELD BLOCK

TURN TABLEfTURN AFTER FIT FLANGE)

REMOTE CONTROL UNIT

OPENING FOR MAINTENANCE

LIFTER FOR RH PORT OF LOWER COVER

RH PORT OF LOWER COVER

NAME OF EQUIPMENT

LOCATION

DESIGN CONDITION

OPERATING CONDITION

TYPE OF EQUIPMENT

MAIN MATERIAL

WEIGHT

ACCESSORY

NOTES

REMOTE HANDLING DEVICE UNIT

RH PORT OF CYLINDER&LOW COVER

EQUIP. CLASS

TEMPERATURE

TEMPERATURE

EQUIP. NO.

QUANTITY

CORROSION

MARGIN

ROOM TEMPERATURE

ROOM TEMPERATURE

CARBON STEEL

MONITORING

LIGHTING

CLEANING

CCD Camera

1. DRIVING SYSTEM

Driving Gear : Rack & PinionSpeed ; Max. 1200 iWmin.


Type ; Power Rench

Torqu; 350~400 N-m


Type; Grinding


Method: TIG Welding or YAG Laser Welding

Speed; 2 0 ~ 100 m/min.


Method; PT

i—i

}

O

OtoO5

Table 2.4-4(2/2) Equipment for Maintenance of RH Port

JAERI-Tech 99-026

<RH Port Remote Handling Procedure

and Equipment for Maintenance>

Figure 2.4-3 shows the RH port handling procedures.

Step 1 : Loosen the flange bolts

(l)Install the bolting device unit on the guide rail

(2)Loosen the flange bolt

(3)Drive the bolting device unit around the flange

(4)Loosen the all flange bolts

Step 2 :Remove the spacers

(l)Remove the spacers by the bolting device unit


Step 3 : Cut the lip seal

(l)Set the welding device unit

(2)Cut the lip seal

(3)Remove the welding device unit

Step 4 : Remove the port covers

(l)Turo the lifting device in order to release the mechanical locking by guide plate

(2)Lift up the port cover

(3)Remove the port cover

(4)Inspection the surface of lip seal

Step 5 : Install the port covers on the flange

(l)Lift down the port cover

(2)Install the port cover along the guide plate

(3)Turn the lifting device for the mechanical locking by guide plate

- 52 -

JAERI-Tech 99-026

Step 6 : Weld the lip seal and perform the liquid penetrant examination (PT).

(1 )Set the welding and examination device units

(2)Weld the lip seal

(3)Perform the liquid penetrant examination (PT)

(4)Remove the welding and examination device units

Step 7 : Insert the spacers

(l)Set the bolting device unit

(2)Insert the spacers

Step 8 : Tighten the flange bolts

(l)Tighten the flange bolts


Step 9 : Perform the local leakage test

(l)Set the local leakage test device unit

(2)Connect the compressing piping to the joint

(3)Pressurize the lip seal part

(4)Perform the local leakage test

(5)Remove the local leakage test device unit

- 53 -

JAERI-Tech 99-026

STEP1; LOOSEN THE FLANGE BOLTS

STEP2 ; REMOVE THE SPACERS

STEP3 ; CUT THE LIP SEAL

FIG.2.4-3 MAINTENANCE PROCEDURE OF RH PORT (1/3)

54 -

JAERI-Tech 99-026

STEP4 ; REMOVE THE PORT COVERS

STEP5 ; INSTALL THE PORT COVERS ON THE FLANGE

STEP6 ; WELD THE LIP SEAL AND PERFORM THE PT


55 -

JAERI-Tech 99-026

STEP7 ; INSERT THE SPACERS

STEP8 ; TIGHTEN THE FLANGE BOLTS

STEP9 ; PERFORM THE LOCAL LEAKAGE TEST


- 56

JAERI-Tech 99-026

2.5 Study of Fabrication/Construction Plan and Schedule

Regarding with the shop fabrication, transportation and field construction plan /

schedule for the cryostat, the following items were investigated.

(l)Block Subdivision

(2)Shop Fabrication Sequence

(3)Nondestructive Examination

(4)Transportation and Field Installation Sequence

(5)Pressure Proof Test Method

(6)Field Installation Schedule

2.5.1 Block Separation

For the block separation, the following issues were considered.

(l)Arrangement of Welding Line

(2)Arrangement of Ports

(3)Maintenance after Operation

(4)Fabrication Ability of Mill Maker

(5)Fabrication Ability of Shop

(6)Transportation Limitation (Size Limitation)

(7)Ability of Crane for Field Carrying

(8)Installation Procedure

The block separation are shown in ATTACH.1-8 ~ ATTACHl-11.

2.5.2 Shop Fabrication Procedure

The fabrication procedure is studied, considering following design issues.

(l)Assembling Work (Fitting and Welding)

(2)Machine Processing

(3)Minimizing work for Turning and Transfer

(4)Minimizing Welding Distortion

(5)Unitizing

The shop fabrication procedure is shown in ATTACH. 1-37 ~ ATTACH1-40.

- 57 -

JAERI-Tech 99-026

2.5.3 Nondestructive Test

The nondestructive Test required for each welding line are studied based on the

ASME Section VIII (Div. 2).

Each weld joint located in the pressure boundary is classified into the following

categories:

Category A : Longitudinal Welding Joints within the Cylindrical Shell

and Welding Joints within the Flat Plate

Category B : Circumferential Welding Joints within the Cylindrical Shell

Category C : Welding Joints between the Flat Plate and the Cylindrical Shell

Category D : Welding Joints between the Sleeve(Port) and the Cylindrical

Shell or the Flat Plate

The welding joints between the shell/flat plate and stiffeners or ribs are

classified into "others".

The tests required to each welding category are as follows:

Category A : Radiographical Test(RT)

Category B : Radiographical Test (RT), where if one side welding joints

with backing metal, Ultrasonic Test (UT) is defined.

Category C : Liquid Penetrant Test (PT)

Category D : Liquid Penetrant Test (PT)

Others : Liquid Penetrant Test (PT)

The nondestructive tests categories are shown in ATTACH. 1-42 ~

ATTACH. 1-44.

- 58 -

JAERI-Tech 99-026

2.5.4 Transportation and Field Installation Procedure

The procedure from the shop shipping to field installation is studied by

considering the following items.

(l)Each block is transported over sea after shop shipping.

(2)A large trailer for the field transportation

(3)In field installation, available crane capacity in field, shop blocks and pre-

assembly space are considered.

The block separation and conceptual procedure field assembly / installation is

summarized in Table 2.5-1. The operation flow from shop shipment to field

assembly is shown in Figure 2.5-1.

The Installation procedure in Tokamak pit is shown in ATTACH. 1-3 5.

- 59 -

Table 2.5-1 Block Separation and Conceptual Procedure of Field Assembly/Installation

eno

Object

Anchorage

Suppression

Tank

Lower Cover

Cylinder

Upper Cover

CS Support

Ring Pedestal

Suppression Tank

General Part

Relief Pipe

Central Block

Ring Pedestal

Middle Block

Outer Block

Lower Cylinder

Middle Cylinder

Upper Cylinder

Central Block

Outer Block

Outline of Shop Blocks

Dimensions

—

15.7m X 6.9m X 6.4m

12.0m X 6.3m X 6.8m

6.1mX6.1mX2.5m

14.3mX3.6mX2.5m

14.9m X 8.5m X 0.6m

17.6m X 7.0m X 0.9m

11.3m X 9.2m X 1.7m

11.3mXl3.5mXl.8m

lt.3mX 9.9m X 1.4m

14.0mX 14.0mX l.5m

19.3m X 12.7m X 6.5m

units

—

4

4

1

6

4

8

10

10

10

1

5

Field Assembly/Installation

(Assembly into Ring is in Shop)

After installation of each anchorage(anchor bolts, etc.), installation concrete mat

of Tokamak

After assembly on ring, transfer into the pit and installation

After assembly of lower block of CS support, transfer / installation into the

Tokamak pit

Transfer into the pit and installation

The lower block of ring pedestal is installed by same procedure







Installation

Schedule

See

ATTACH.

1-35

STEP1

STEP 2

STEP 3

STEP 4

STEP 3

STEP 5

STEP 6

STEP 7

so

—3CDO3 "

CDto

O

FIG. 2.5-1(1/3) < PROCEDURE OF CRYOSTAT TRANSPORTATION (1/3) >

LIMITATION;

• MAX. OVER LENGTH

W14mXL19mXH6m

• MAX. WEIGHT

11.77 MN (1200TON)

ICT>

SHIPPING AT SHOP

LIFTTING CRANE

>CDPC

CDo

totoI

o(S3Oi

(FOB)

7

OCEAN

UN1X>ADING

FIG. 2.5-1(2/3) <PROCEDURE OF CRYOSTAT TRANSPORTATION ( 2 / 3) >

OCEAN

TRAILER

TRANSPORTATION AT SITE

ASSEMBLY FIXTURE

-*- WITH COVER

FIELD ASSEMBLY

pa

o

Io

FIG. 2.5-1(3/3) < PROCEDURE OF CRYOSTAT TRANSPORTATION (3/3) >

GO

TOKAMAK BUILD. CRANE

CAPACITY: 11.77 MN

(1200TON)

(ASSEMBLY HALL)

P<3

•nooTRANSPORTATION INTO

TOKAMAK BUILDING

t t X

-9

Io

PIT INSTALLATION

JAERI-Tech 99-026

2.5.5 Pressure Test Method

After the installation of cryostat, the inside of the cryostat will be pressurized up

to test pressure in order to confirm the structural integrity.

The pressure test is performed as follows;

(l)Test System

Figure 2.5-2 "Outline of Cryostat Pressure Test"

(2)Test Pressure: PtP, = 0.1 x 125*' = O.l25MPa (gage pressure)

note) *1 : according to the ASME B&PV Code Section Vffl (Div.2)

AT-320(Vessels Designed for Vacuum)

(3)Test Medium

N2gas

(4)Time Schedule

0)u3

be<sO

2

Pressure proof tes

0.125

t

y \/ 0.0625

/ TIME

Leakage Test

0.1

\

\

2.5.6 Field Installation Schedule

The schedule from shop fabrication to field installation of the cryostat is

shown in Table 2.5-2.

- 64 -

FIG. 2.5-2 < CRYOSTAT PRESSURE TEST >

PURGE VALVE

PRESS.

>RESSURE TEST

JOUNDARY

Sl^l^^S^S^te^t Jl i-BiiilHi1^: l i J^ j'p l 'iif.fe 1 s H.i^?

TANK TRUCK

'ALVE-f LN2 j

G.L

(Pc ) PRESSURE GAUGE

o

oC31

Table 2.5-2(1/2) SHOP FABRICATION & TRANSPORTATION SCHEDULE OF CRYOSTAT

ITEM

1 SHOP MANUFACTURING

1) ANCHOR BOLTS

REQUIRED PERIOD (MONTH)1

i

(

—i—2) RING PEDESTAL & CS SUPPORT

3) LOWER COVER

4) LOWER CYLINDER

5) MIDDLE CYLINDER

6) UPPER CYLINDER

7) UPPER COVER

8) PORTS

t

!!

!

!

!

1i

i

= - •

-—i—--

3!

s!

—• =

j~' r—

|

9) INSPECT1ON(V1SUAL & DIMENSIONAL CHECK)i

i

i1!

2 TRANSPORT ATION(BARGE) !;||j

!

1

»

i

4

I

= = —

j

\—-

i

jr—

t>

r

i

1

i

|

V

i

5

i

1

j

!

r

—=i=1

—

j

1

iI

i

6

—

• = .

7!

Ij

11|

i !

!

ji

,

V

V i

8!

!

1iij

i

=

—i—-i-

i!i1!

i}

91

=

—

j

i

i

i

10:

= t =

!

!I

1

i

•

y

1

1

!{

jV

12

!

j

—1—

i

i

i

I

j1

13

ii

|

— 1

14

!

-,

V

1

!

V

15

!

••

1•

i

ii

i

i

16i

1

1

;

I

i

17i

1

!

f

j

V

i

i

!

!

j

•

V

!

is

1

ii

i

j

19}

I!

1

:

i

1

i

TO

!

ii

i

!

V i

j

V

i!

REMARKS

PO

IDI

o(S3

Table 2.5-2(2/2) SITE INSTALLATION SCHEDULE OF CRYOSTAT

ITEM

1 PREPARATION

1) SITE OFFICE

2) ASSEMBLY FIELD

2 SITE CONSTRUCTION

1) ANCHOR BOLTS

REQUIRED PERIOD (MONTH)1

•=( )

i

2) RING PEDESTAL & CS SUPPORT

II

2

>

(GUARD)i— 1 —

3) LOWER COVER & LOWER CYLINDER

4) MIDDLE CYLINDER

S) UPPER CYLINDER

6) UPPER COVER

7) PORTS

8) PNUMATICTEST

i— —i

4

)

9) D1S-ASSEMBLY OF CONSTRUCTION JIG(SUPPORT ETC.)

3 CLEARING

5 6 7 8

i

1

9

1

10

•

I

11

—>

12!!

ij

131

ii

!

i

i

14

!

i

I

; 1

i

15

ii

i

< =

161

1

j

1! I

1)

17

i}

[1

!

181

i

I

ii

!

1jI

REMARKS

>

ft)o

oto

JAERI-Tech 99-026

2.6 Future works and R&D Activities

The structural design and the investigation on fabrication / installation of the

single-walled cryostat proposed by the JCT are performed.

Items that should be studied more are shown as follows.

2.6.1 Design of Cryostat

• Evaluation by detailed analysis for dynamic load

•Evaluation of reliability of the flexible joints

•Study of decreasing plate thickness (250mm) of the upper plate of ring pedestal

which are the field welding joints

• Study of possibility of the mid-basement-floor in the tokamak building for

lower cover maintenance• Study of the cryostat cylinder by flat plate

• Study of the vibration proof structure

2.6.2 Fabrication and Installation

• Study of cutting, welding and nondestructive test method of thick stainless

steels• Study of the equipment for field assembly

2.6.3 R&D

•Availability clarification of ASME Section-VDIDivision-2 for large vessel

structure with many penetrations

•Reliability clarification of the flexible joints

•Cutting, welding and nondestructive test method of thick stainless steels

• Remote handling devices for bolting, cutting, rewelding and welding

nondestructive test

- 68 -

JAERI-Tech 99-026

3. Suppression Tank Detail Design

3.1 Introduction

The vacuum vessel pressure suppression tank is the vessel which is located under

the lower bio-shield in order to keep the vacuum vessel pressure below the design

value of 0.5 MPa during the water spillage from in-vessel component. The

suppression tank with the water of half volume of tank is connected to the 4

divertor handling ports. The spilled water and steam inside vacuum vessel are led

to the suppression tank through the divertor handling ports and the pressure inside

vacuum vessel is kept below the design value.

The following design items are studied.

- Detail design of the suppression tank and pipes

- Tank removal/installation procedure for the lower PF coil maintenance

3.2 Design Conditions

3.2.1 Suppression Tank

l)Design Pressure : 0.5 MPa

2)Normal Pressure : 0.01 MPa

3)Design Temperature Normal Temperature : 20°C

LOCA Temperature : 8 0 ^

4)Seismic Load Horizontal Direction : 2.828 X0.2G

Vertical Direction : 2.2X-0.2G

(Peaking Factor XSL-2)

3.2.2 Rupture Disk

l)Opening Pressure : 0.2 MPa

2)Normal Pressure : 0.01 MPa

3)Leakage : 10"10Pa-m3/sec

3.2.3 Bellows Expansion

1 )Axial Direction Displacement/Cycle : 50mm X103cycle

2)Lateral Direction Displacement/Cycle : 80mmX103cycle

3.2.4 Material

1 Suppression Tank : SUS304L

2)Rupture Disk : SUS304L

3)Bellows Expansion : SUS304L

- 69 -

JAERI-Tech 99-026

3.3 Detailed Design of Suppression Tank

3.3.1 Structure of Suppression Tank

The structure of suppression tank is shown in the following drawings.

Attach. 2-25 VV Suppression Tank General Arrangement

Attach. 1-26 W Suppression Tank Sectional View

Attach. 1 -27 VV Suppression Tank Front View (Relief Pipe Portion)

Attach. 1-28 VV Suppression Tank Front View (Distributor Portion)

Attach. 1 -29 VV Suppression Tank Front View (Connection Portion)

Attach. 1-30 W Suppression Tank Support Detail

3.3.2 Study of mechanical strength of the suppression tank

The mechanical strength of the shell and heads of the suppression tank are

evaluated in accordance with the ASME Boiler and Pressure Vessel Code

Section-VIII division-2.

(1) Shell


The required thickness of the shell is obtained by the following formula.

t P R

S-03P

Where,

t; minimum required thickness of the shell

P; internal design pressure of 0.5MPa and static head of the fluid of 0.03MPa

=O.53MPa

R; inside radius of the shell =281 Omm

S; membrane stress intensity limit =115MPa (SUS304L, at room temp.)

The minimum required thickness is as follows;

0.53x2810t = = 13.0mm

115-0.5x0.53

The present shell thickness (14mm) is thicker than the result. Therefore, the

mechanical strength of shell for the design internal pressure satisfies with the

ASME Section-VIII division-2.

- 70 -

JAERI-Tech 99-026


The maximum allowable external pressure can be evaluated by the following

procedure. The thickness of shell is assumed to be 14mm in this analysis.

- ^ = ^ = 0 . 4 0Do 5648

^ = 5 6 4 8 = 4 0 3t 14

Where,

Do; outer diameter of the shell' =5648mm

L; distance between stiffening rings =2250mm

According to the FIG. G shown in the Subpart 3 "Charts and Table for

Determining Shell Thickness of Components under External Pressure" of ASME

B&PV Code, Sec. II, Part D, the factor "A" is as follows;

A=0.00043

Then, by the FIG. HA-3 "Chart for the determining shell thickness of components

under external pressure when constructed of austenitic steel (18Cr-8Ni-0.0035

maximum carbon, type 304L)" of ASME B&PV Code Sec. II Part D, the factor

"B" is determined as follows,

B=6000

Therefore, the maximum allowable external pressure Pa is

_ 4B _ 4 x 60003(3D0/t) 3x403

= 19.85psi

= 0.136MPa>0.1MPa

The maximum allowable external pressure is larger then the design external

pressure of 0.1 MPa. The mechanical strength of shell for the design external

pressure satisfies with the ASME Section-VIII division-2.

- 71 -

JAERI-Tech 99-026

c. Mechanical strength of the stiffening ring

The moment of inertia of the stiffening ring is evaluated. The required moment of

inertia of the combined ring-shell section Is is calculated as follows;

_D02L5(

10.9

56482x2250x(l4 + 6100/2250)x2.7xl0-4 , t

= - '- = 2.971 xlO7 mm4

10.9Where,

As; cross-section area of the stiffening ring =6100mm2

Ls; length between stiffening rings =2250mm

According to the FIG. HA-3 in the Subpart 3 of the ASME B&PV Code Section

II, the factor "A" is as follows;

A=2.7xlO"4.

Here, the factor "B" is calculated as follows:

_ 2 [ 0.1 x 5648 I~4XLl4 + 6100/2250j= 253MPa = 3669psi

If the dimensions of the cross section are shown in the following figure, the

available moment of inertia is calculated as the following procedure.

The effective width of the shell W isW=U0>/DoT,

= I.I 0 x V5648xl4 = 309mm

Where, Ts is the thickness

of the shell of 14mm.

- 72 -

JAERI-Tech 99-026

The each moment of inertia is summarized as follows:

(D(D(3)

total

A (mm2)

4326

3600

2500—

y (mm)

7

126.5

251.5—

i (mm4)

7.066 X104

1.519X107

1.302 XI05

1.539 X107

AAy2 (mm4)

4.317X107

1.383 XI06

5.227 X107

9.682 XIO7 ;

The available moment of inertia is

y) l ° 7 + 9 - 6 8 2 x l ° 7 =1-122x10* mm4.

Where,

Ay; distance between the center of the component, y, and e

e; the center of gravity of the combined shell-ring section

6 =4326x7 + 3600x126.5 + 2500x251.5

4326 + 3600 + 2500

The available moment of inertia / is larger than the required moment of inertia

Is. Therefore the supposed cross-section of the stiffening ring is sufficient to

the design external pressure of 0.1 MPa.

(2) Head of the tank


The required minimum thickness is evaluated in accordance with "Article D-2,

Shells of revolution under internal pressure" AD-204"Formed Heads" of

ASME B&PV Code Section-VIII division-2. The fundamental dimensions

of the head are as follows:

• Inside crown radius of the head; L=8000mm

• Inside knuckle radius of the head; r=5 62mm

• Inside diameter of the head; D=5620mm

• r/D = 562/5620 = 0.10

- 73 -

JAERI-Tech 99-026

Several calculation trials are performed by changing the thickness of the head th.

The typical calculation examples are as follows,

(a) Case-1 th =14mm, the same thickness as the shell

In this case, the t/L is 0.00175 and is out of the applicable range specified

in the FIG. AD204.1 "Design curves for torispherical heads and 2:1 ellipsoidal

heads for use with AD204.2 and AD204.3".

(b)Case-2 th=16mm

The parameter P/S is 0.0015 from the design standard. Here, S is the

membrane stress intensity limit of 115MPa. The allowable internal pressure P

is P=0.0015xll5=0.172MPa. As the design internal pressure is 0.53MPa,

integrity of the head cannot be maintained.

(c) Case-3 th =50mm

From the design standard, the parameter P/S is 0.0063 under the condition

of th/L=50/8000=0.00625. Therefore, the allowable internal pressure is

P=0.724MPa. This result satisfies with the internal design pressure of 0.5

MPa.

(d) Case-4 th -40mm

From the design standard, the parameter P/S is 0.0047 under the condition

of th/L=40/8000=0.005. Therefore, the allowable internal pressure is estimated

as P=0.541MPa. This result also satisfies the internal design pressure of 0.5

MPa.

The thickness of the head th is concluded to be minimum 40mm by these

calculation trials. For this, the connection between head and shell with a

thickness of 14 mm is required to prevent large stress concentration due to the

geometrical discontinuity. According to the AD-420 "Transition joints

between sections of unequal thickness", a tapered transition with length of

3x(th-ts)=3x(40-14)«80mm is needed.


According to the AD-360 "Formed Heads" in "Article D-3, Shells of

revolution under external pressure", the mechanical strength of the head with a

thickness of 40mm is assessed as follows:

(a) Estimation of the factor "A"

A=0.125/(Ro/th)=0.125/(8040/40)=0.000622

Here, Ro is the outside radius of the head-crown of 8040mm.

- 74 -

JAERI-Tech 99-026

(b) Estimation of the factor "B"

According to the FIG. HA-3 of the Subpart-3 in ASME B&PV Code

Section-II, the factor B is 7800psi for the factor "A".

(c) Estimation of the maximum allowable external pressure

The maximum allowable external pressure Pa is

Pa=B/(Ro/t)=7800/(8040/40)=39psi=0.268MPa.

(d) Evaluation of the mechanical strength

The maximum allowable external pressure is larger than the design

external pressure of 0.1 MPa. Therefore the thickness of the head of 40 mm

satisfies with the required mechanical strength.

c. Conclusions

The conclusions are summarized below,

(a)The thickness of shell and head are determined based on the ASME B&PV

Code, Section-VIII division-2.

The shell thickness : 14 mm

The head thickness :40 mm

(b)The configuration of stiffening ring is determined.

(c)In the future, the detailed stress assessment by FEA is needed, because the

head is not satisfied with the structural limitation specified in the AD-204.4

"Crown and Knuckle Radii".

- 75 -

JAERI-Tech 99-026

3.4 Rupture Disk / Bellows Detailed Design

3.4.1 Structure of Rupture Disk / Bellows

-The outline of the relief piping connecting the divertor handling port is shown in

ATTACH. 1-31.

-The detail structure of the rupture disk is shown in ATTACH. 1-32.

-The detail structure of the jimbal-bellows which accommodates the relative

displacement between the divertor port and the cryostat lower cover is shown in

ATTACH. 1-33.

- The detail structure of the lower cover penetration bellows that accommodates

the relative displacement between the cryostat lower cover and the suppression

tank is shown in ATTACH. 1-34.

3.4.2 Mechanical Strength of the Rupture Disk and Expansion Joint

(1) Diaphragm thickness of the rupture disk

In general, the structure of diaphragm is determined based on the results obtained

by the tests using prototype disks. Therefore, in this study, the diaphragm thickness

is determined under the assumptions listed below:

Longitudinal elastic modulus of the diaphragm material; E=195GPa

Curvature of the radius of the diaphragm; a= 130cm

Factor K=0.5 ~ 0.7 (to be confirmed by the tests)

The thickness of the diaphragm is,

02 x2xl30x(0.5~0.7)U6.7xl.95xlO5

= 0.17~0.24(cm)

Here, the rupture (burst) pressure P is 0.2MPa.

- 76 -

JAERI-Tech 99-026

The thickness of the diaphragm is concluded 2mm. As mentioned above, however,

the thickness and the height of the diaphragm should be confirmed by the tests. The

factor K should be also reassessed by the tests using prototype disks. This is one of

the R&D activity to improve the structural and safety design.

(2) Mechanical strength of the bellows

Based on the EJMA standard**!), the integrity of the bellows between the divertor port

and the suppression tank( is assessed. The loading conditions are listed below,

Internal pressure; 0.5MPa

Deflection range and number of the cycle

Axial direction; 50mm x lOOOcycles

Transverse direction; 80mm x lOOOcycles

The detailed design results are shown in Table 3.4-1.

The circumferential membrane stress due to the internal pressure;

S2=33MPa<l 15MPa=allowable membrane stress limit

Cumulated usage factor,

NE/NC=0.51 15<0.1=allowable usage factor limit

The membrane stress due to the internal pressure and the cumulated fatigue damage

due to the cyclic deflection are lower than the allowable limits. Therefore, the

mechanical strength of the bellows is sufficient under the lording condition.

[NOTE]

(*1); EJMA standard means "Standard of the Expansion Joint Manufactures

Association, INC".

(*2); The configuration and dimension of the bellows expansion are shown in the

Attachment 1-33, "Jimbal Bellows Detail".

- 77 -

JAERI-Tech 99-026

Table 3. 4-1 Stress calculation results Ifor the expnsion joint

Stress calculation sheet for double type expansion joint

Plant/Equipment ITER / Vacuum vessel pressure suppression tank

Identification of the expansion joint

geometrical specification

Bellows pitchConvolution depthPitch diameter of bellowsNominal material thickness of the one plyNumber of bellowsNumber of convolutions in one bellowsDistance between outermost ends of the convolutionLength of straight portionCurvature of convolutionOutside diameter of cylindrical tangentLength of intermediate ringLength of end pipeBellows material thickness factor of one plyShape factorShape factorRatio of maximum moment/pressureRatio of deflection/loadRatio of deflection/maximum moment

Bellows material

Symbol

qWdptcNL1ardL2L3

tpC24XC24CpCfCd

—

Unit

mmmmmmmm——mmmmmmmmmmmmmm—————

—

Design condition symbol unit**'

Maximum design pressureDesign temperatureApplied axial movementApplied lateral deflectionApplied radial deflectionApplied angular rotationNumber of cyclesLongitudinal elastic modulus

Calculation of the deflection

Equivalent radial deflection of angular componentEquivalent axial deflection of lateral componentEquivalent axial deflection of radial componentTotal axial deflection

Stress calculation

Circumferential membrane stress due to internal pressureJudgement for the stress aboveMeridian membrane stress due to internal pressureMeridian membrane stress due to internal pressureMeridian membrane stress due to deflectionMeridian bending stress due to deflectionMeridian membrane stress due to radial bulgeTotal meridian stress

PT

AXY1Y28

NDE

kq/cm2q• cmmmmmm

degreecycles

ka/mm2

Relief pipe expansion joint

Dimension

6080

12601.5

210

7845015

1180184

01.4520.380.640.681.4

1.65

type 304L SS

value

520508000

100019900

Remarks

q/4

ffd/dD)10

q/(2*W)q/(2.2*(dD • to)05)Figured 8Figured 9Figure C20

remarks

EJMA (UNREINFORCED BELLOWS)

A 0AL1AL2A

mmmmmmmm

0299.06

0.00349.06

EJMA (UNREINFORCED BELLOWS)

S2—S3S4S5S6S7St

kq/mm2

kq/mm2

kq/mm2

kq/mm2

kq/mm2

kq/mm2

kq/mm2

kq/mm2

3.35< 11.7

0.6925.80

1.02159.19

0.00178.75

good

Fatigue damage calculation EJMA (UNREINFORCED BELLOWS)

Temperature correction factorFatigue lifeFatigue damage

Cumulated usage factor

TfNc

ND/Nc

U

—

cycles—

—

1.001955

0.5115

< 1.0

(SuC + SuH)/(2*SuC)Figure C21

good

(•); The unit "kg" means a gravity force by the unit mass in the conventional engineemng unit.

- 78 -

JAERI-Tech 99-026

3.5 Study of Disassembly and Assembly at Maintenance

The disassembly/assembly procedure and the equipment which are required during

disassembly/assembly are studied.

a. Pre-conditions

In the design study of assembly / disassembly procedure, the following

pre-conditions are considered.

-The bio-shield under the lower cover should be pre-installed.

-Two openings of 4.2m height X 6m wide should be arranged in the pit to enter and

remove the suppression tank.

-The mid-basement-floor should be pre-assembled.

-There should be sufficient space to turn the suppression tank for the transportation.

b. The equipment for the suppression tank assembly / disassembly is shown in Table

3.5-1.

c. Removal and Installation procedure

The conceptual procedure of removal/installation of suppression tank is as

follows.

Removal Procedure;

STEP 1 : Remove the suppression tank water

STEP 2 : Cut the relief pipes

STEP 3 : Cut the tank

STEP 4 : Lift up the tank and set the transfer table

STEP 5 : Remove the tank by the transfer table

STEP 6 : Turn the tank

STEP 7 : Transfer the tank

(Transfer the bio-shield and remove the lower cover)

(Install the lower cover and the bio-shield)

- 79 -

JAERI-Tech 99-026

Installation Procedure

STEP 8 : Install the tank.

STEP 9 : Weld the tank and perform the welding nondestructive examination

STEP 10: Weld the relief pipes and perform the welding nondestructive

examination

STEP11: Perform the pressure test and the leakage test

- 80 -

• CUT RELIEF PIPE & PORT• SET REMOVABLE TABLE• CUT OF an SHELL

TRAVELING TABLETURN TABLE

00

REMOVE S/T TO PIT OPENING• SET S/T ON TURN TABLE

•OVER TURN S/T• HORIZONTAL TURN S/T• REMOVE TURN TABLE

• TRANSFER S/T ON TRAVEUNG TABLE• CARRY OUT SAT

NAME OF EQUIPMENT

LOCATION

DESIGN CONDITION

OPERATING CONDITION

TYPE OF EQUIPMENT

MAIN MATERIAL

WEIGHT

ACCESSORY

NOTES

TURNTABLE

SUPPRESSION TANK

EQUIP. CLASS

TEMPERATURE

TEMPERATURE

EQUIP. NO.QUANTITYCORROSIONMARGIN

ROOM TEMPERATURE

ROOM TEMPERATURE

CARBON STEEL

REMOVABLE TABLETRAVELING TABLE

FOR HORIZONTAL MOVEMENTFOR CARRY OUT

1. FUNCTION;

(DOVER TURN

© HORIZONTAL TURN

2. ALLOWABLE LOAD ; 30 tons

3.APPROX.DIMENSION; * 6 m X i-6m X H S m

4. DRIVING SYSTEM ; ELECTRICAL

>

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Table 3.5-1 Maintenance Equipment for Suppression Tank

JAERI-Tech 99-026

Suppression Tank Assembly/Disassembly Procedure>

The procedure of the assembly/disassembly of suppression tank is shown in Figure 3.5-

1.

STEP 1 : Remove the suppression tank water

(l)Prepare the storage tank

(2)Connect the piping for removal

(3)Transfer the water to the storage tank

(4) Wash out the inside of suppression tank by clean water

(5)Remove the pipes

STEP 2 : Cut the relief pipes

(l)Measure the contact dose and surface contamination of suppression tank

(2)Cut the guard pipes

(3)Cut the relief pipes

(4)Cut the distributer in the tank

STEP 3 : Set the transfer table

(l)Set the transfer table for tank transfer

(2)Fix the suppression tank by the support

STEP 4 : Disassemble the suppression tank

(1 Considering the size of the opening, disassemble the tank

STEP 5 : Transfer the tank

(l)Liftupthetank

(2)Transfer the disassembled suppression tank to the pit opening.

(3)Stop the transfer table on the turn table.

(4)Remove the removable table

STEP 6 : Turn the tank.

(l)Turn the tank with the turn table.

(2)Lift down the disassembled tank on the transfer table

STEP 7 : Transfer the tank.

(l)Transfer the tank.

- 82 -

JAERI-Tech 99-026

STEP 8 : Install the tank

(1/Transfer the tank into the pit.

(2)Turn the tank

(3)Transfer the tank from the pit opening to the installation position

STEP 9 : Weld the tank and perform the welding nondestructive examination

(l)Weld the tank and perform the welding nondestructive examination

(2)Weld the distributer and perform the welding nondestructive examination

(3)Assemble and weld the opening for human access and perform the welding

nondestructive examination

STEP 10: Weld the relief pipes and perform the welding nondestructive examination

(l)Weld the relief pipe and perform the welding nondestructive examination

(2)Weld the guard pipe and perform the welding nondestructive examination

STEP11: Perform the pressure test and the leakage test

- 83 -

STEP1; REMOVE THE SUPPRESSION TANK WATER

00

I

TRANSFER PIPING LINE

VALVE

- 3CO

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PUMP STORAGE TANK

FIG.3.5-1 MAINTENANCE PROCEDURE OF SUPPRESSION TANK (1/9)

STEP2 ; CUT THE RELIEF PIPES STEP3 ; SET THE TRANSFER TABLE

oo

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———

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^ ' •" • ' • •

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TRANSFER TABLE


STEP4 ; CUT THE TANK

I00

TANKS ARE REMOVED, MAINTAINED AND

RE-INSTALLED EXCEPT THE BLOCKS IN

FRONT OF THE OPENING

CUTTING LINE

TRANSFER TABLE

OPENING OF THE PIT

THE BLOCKS IN FRONT OF THE OPENING ARE

CUT, REMOVED AND RE-ASSEMBLED.

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STEP5 ; TRANSFER THE TANK

00

I

LIFT UP

OVERTURN —

TRANSFER TO THE

PIT OPENING

TO

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TURN TABLE

HORIZONTAL TURN


STEP6 ; TURN THE TANK

OVER TURN

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HORIZONTAL TURN

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STEP7 ; REMOVE THE TANK

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STEP8 ; INSTALLTHE TANK

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TURN->UPSET-^TRANSFER

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STEP9 ; WELD THE TANK AND PERFORM THE NDE

WELD LINE

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THE BLOCKS IN FRONT OF THE OPENING

ARE RE-ASSEMBLED INTO THE PIT.


STEP10 ; WELD THE RELIEF PIPE

WELE

CO

GUARD PIPE RELIEF PIPE

WELDING PROCEDURE:

(DWELD RELIEF PIPE

©LIFT UP SPLICE PLATE

®WELD(UPPER SIDE)

<DWELD(LOWER SIDE)

SPLICE PLATE

>CDSO

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WELD DETAIL


JAERI-Tech 99-026

3.6 Study of Rupture Disk Exchange Plan

The exchanging procedure of rapture disk is investigated.

a. Precondition

The rapture disk remote exchange procedure is investigated with considering the

following conditions:

-The rapture disk is exchanged with remote handling equipment from the

divertor port.

b. The equipment for the rapture disk exchange is shown in Table 3.6-1.

c. Exchange Procedure

The exchanging procedure of the rapture disk is as follows.

Disassemble Procedure;

STEP 1 : Set the equipment for maintenance

STEP 2 : Disassemble and remove the cover flange

STEP 3 : Disassemble and remove the upper rapture disk

STEP 4 : Disassemble and remove the lower rapture disk

STEP 5 : Inspect the relief pipe's side-lip-seal

(Exchange new rapture disks)

Assemble Procedure;

STEP 6 : Transport and weld the lower rapture disk

STEP 7 : Transport and weld the upper rapture disk

STEP 8: Transport and weld the cover flange

STEP 9: Remove the maintenance equipment

STEP10:Perform the local leakage test

93 -

<o

I

ATTACHMENTl'OH FIXATION

REMOTE DEVICE UNIT

LIP SEAL WELD

TEST HOLE

NAME OF EQUIPMENT

LOCATION

DESIGN CONDITION

OPERATING CONDITION

TYPE OF EQUIPMENT

MAIN MATERIAL

WEIGHT

ACCESSORY

NOTES

REMOTE HANDLING DEVICE UNIT EQUIP. NO

DIVERTOR PORT

EQUIP. CLASS

TEMPERATURE

TEMPERATURE

QUANTITY

CORROSION

MARGIN

ROOM TEMPERATURE

ROOM TEMPERATURE

CARBON STEEL

MONITORING

LIGHTING

CENTERING

CLEANING

POSITIONER

ITV. CCD Camera

GUIDE RAIL

1. DRIVING SYSTEM

Driving Gear: Rack & Pinion

Speed; Max. 1200 m/min.


Type ; Power Rench

Torqu ; 100~ 150 N-m


Type; Grinding


Method : TIG Welding or YAG Laser Welding

Speed; 20~ 100 na/min.


Method; PT

(The transporter of each tool is a Remote Control Unit(vehicle) moving along a

guide rail)

>t-fl•pa

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Table 3.6-1 Equipment for Maintenance of Rupture Disk

JAERI-Tech 99-026

<Rupture Disk Exchange ProcedurO

The rupture disk exchange procedure is shown in Figure 3.6-1.

STEP 1 : Positioning the maintenance equipment

(l)Drive the maintenance equipment to location of the relief pipe

(2)Positioning the equipment

STEP 2 : Remove the cover flange

(l)Loosen the bolts for the cover flange

(2)Remove the cover flange.

(3)Transfer the cover flange.

-Transfer the removed cover flange to the cask

STEP 3 : Remove the upper rupture disk

(l)Cut the lip seal

(2) Loosen the bolts

(3)Remove the upper rupture disk

(4) Transfer the upper rupture disk

STEP 4 : Remove the lower rupture disk

Same procedure as STEP 3

STEP 5 :Machining the relief pipe's side-lip-seal

STEP 6 : Transfer and weld the lower rupture disk

(l)Set the lower rupture disk on the maintenance equipment

(2)Set the welding device unit on the maintenance equipment

(3)Install the lower rupture disk.

(4)Weld the lip seal.

(5)Tighten the bolts

STEP 7 : Transport and weld the upper rupture disk

Same procedure as STEP 6

STEP 8 : Transfer and bolt the cover flange

(l)Set the cover flange on the maintenance equipment

(2)Set the bolting device unit on the maintenance equipment

- 95 -

JAERI-Tech 99-026

(3)Tighten the flange bolts with the bolting device unit

STEP 9 : Remove the maintenance equipment

STEP 10: Perform the local leakage test

The space between the rapture disks is pressurized with the compression line

pre-installed for the local leakage test.

- 96 -

STEP1; SET THE EQUIPMENT FOR MAINTENANCE

Divertor handling port

Relief pipe

FIG.3.6-1 MAINTENANCE PROCEDURE OF RUPTURE DISC (1/6)

>m

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STEP2 ; REMOVE THE COVER FLANGE

ID

Bolting device

unit

Rapture disk handling

unit

i—i

—JCDonrto

ioto


STEP3 ; REMOVE THE UPPER RUPTURE DISC

Lip seal


STEP4;REMOVE THE LOW RUPTURE DISC STEP5;MACHINING THE RELIEF PIPE'S SIDE LIP SEALSTEP6;TRANSPORT&WELD THE LO W RUPTURE DISC

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STEP7;TRANSPORT&WELD THE UPPER RUPTURE DISC STEP 8 ;TRANSPORT&WELD THE COVER FLANGE

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STEP9.REM0VE THE EQUIPMENT FOR MAINTENANCE STEP10;PERFORM THE LOCAL LEAKAGE TEST

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JAERI-Tech 99-026

3.7 Study of Fabrication/Construction Plan and Schedule

Regarding with the shop fabrication, transportation and field construction plan /

schedule for the suppression tank, the following issues are investigated.

(l)Block Separation

(2)Shop Fabrication Procedure

(3 Nondestructive Examination

(4)Transportation and Field Installation Procedure

(5)Pressure Test Method

(6)Field Installation Schedule

3.7.1 Block Separation

By considering the following items, the separation method of suppression tank

are investigated.

(1 fabrication Ability of Mill Maker

(2)Fabrication Ability of Shop

(3transportation Limitation (Size Limitation)

(4)Ability of Crane in Site

(5)Installation Procedure

The block separation of suppression tank is shown in ATTACH. 1-25.

3.7.2 Shop Fabrication Procedure

The shop fabrication procedure are studied considering the cutting/bending

processing, welding procedure, required to examination/inspection and ability

of equipment in shop.

The shop fabrication sequence is shown in ATTACH. 1-41.

3.7.3 Nondestructive Examination

Based on the ASME Code Section VIII (Div. 2), the nondestructive

examination method of each welding line are studied.

The category of nondestructive examination is shown in ATTACH. 1-45.

- 103 -

JAERI-Tech 99-026

3.7.4 Transportation and Field Installation Procedure

The transportation procedure from shop to site (including the marine

transportation) is the same as that of the cryostat shown in section 2.5.4.

Since the full assembly of suppression tank is performed on the ground in site,

the required assembly procedure on the ground is studied.

The procedure of installation are shown in ATTACH. 1-35 and 1-36.

3.7.5 Pressure Test Method

After the installation, the integrity of the assembly should be clarified by the

pressure test.

Because the tank is connected to the divertor ports through relief pipes, the upper

part of the relief pipe is to be isolated from the port by the plugs during the

pressure test.

The planned test method is the pneumatic test because the tank can not fill up

with water considering the tank structure.

The procedure of the pressure test is as follows:

(l)Test System

Figure 3.7-1 " Outline of Suppression Pressure Test"

(2)Test Pressure : PtP, =0^x1.15*' =0J75MPa

note) *1 : according to ASME Sec.Vffl Div.2 AT-410 (pneumatic tests)

(3)Test Medium

N2gas

- 104 -

JAERI-Tech 99-026

(4)Time Schedule

%mCO

<x>bocti

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2OH-uCO

a>H

Pressure proof test Leakage Test

0.575

OF,

TIME

3.7.6 Field Installation Schedule

The shop fabrication and field installation schedule of the suppression tank is

shown in Table 3.7-1.

- 105 -

©

I

PURGE VALVE

PRESS.

TEST PLUG

DIVERTOR PORT

CRYOSTAT

^ 7A TANK TRUCK

'ALVE

-f LN2 J

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PRESSURE GAUGEf—>

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PRESSURE TEST BOUNDARY

FIG. 3.7-1 SUPPRESSION TANK PRESSURE TEST

Table 3.7-1(1/2) SHOP FABRICATION & TRANSPORTATION SCHEDULE OF SUPPRESSION TANK

ITEM

1 SHOP MANUFACTURING

1) ANCHOR BOLTS

REOUIRED PERIOD (MONTH)1 2

—

3!

!

2) SUPPRESSION TANK(RELIEF PIPE PORTION)

I1 —3) SUPPRESSION TANK(GENERAL PORTION)

4) RUPTURE DISC

5) BELLOWS

6) RELIEF PIPE

7) PENETRATION BELLOWS

— j —1

k—

c =

-4-|

. 1

=--

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.

8) 1NSPECT1ON(V1SUAL & DIMENSIONAL CHECK)

2 TRANSPORTATION(BARGE)

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Table 3.7-1(2/2) SITE INSTALLATION SCHEDULE OF SUPPRESSION TANK

o00

ITEM

I PREPARATION

1) SITE OFFICE

2) ASSEMBLY FIELD

1 SITE CONSTRUCTION

1) ANCHOR BOLTS

REQUIRED PERIOD (MONTH)

•iIi

• i ^

f ,

21

!

I

. j :i

3j 4i

(GUARD)—

2) SUPPRESSION TANK(RELIEF PIPE PORTION)

II i3) SUPPRESSION TANK(GENERAL PORTION)

4) RUPTURE DISC

5) BELLOWS

6) RELIEF PIPE

7) PENETRATION BELLOWS

8) PNUMATICTEST

9) DIS-ASSEMBLY OF CONSTRUC

1 CLEARING

i

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JAERI-Tech 99-026

3.8 Future works and R&D Activities

The detail design of tank structure and the fabrication / installation schedule is

performed.

The following items are considered for the further design study and R&D activities.

3.8.1 Suppression Tank

• Study of mechanical strength for the hydrodynamic load

•Detailed analysis of the tank head and penetrations

•Detail design of the penetrations such as manholes and drain pipes

• Study of possibility of the mid-basement-floor in the pit for tank

assembly/disassembly

3.8.2 Fabrication and Installation

• Study of the relief pipe gag retaining pressure in the divertor port

• Study of the field assembly equipment

•Study of detailed procedure of tank installation

• Study of temporary storage space of the tank after suppression tank disassembly

3.8.3 R&D•Development of rapture disk using prototype

• Development of remote handling equipment and device units for rapture disk

exchange

- 109 -

JAERI-Tech 99-026

4. Conclusions

4.1 Cryostat

(l)The detailed structural design considering the fabrication and the installation

was performed.

(2)The structural integrity has been assessed with the structural analysis by JCT.

However, when the mechanical strength was calculated by the formula of the

ASME B&PV Code Sec.VDI Div.2, the present cryostat design was not satisfied

with the required mechanical strength for external pressure. Therefore, in order to

satisfied the mechanical strength by design formula of ASME B&PV Code Sec.Vffl

Div.2, the altered stiffening ring has been proposed.

(3)The conceptual design of remote cutting and re-welding device units for the

upper cover, lower cover and RH port removal/attachment were performed. In

addition, the procedure of cutting and re-welding of each cover has been clarified.

(4)The procedure and schedule of shop fabrication, installation and testing of

cryostat are clarified.

(5)The future study and development items are listed.

4.2 Suppression Tank

(l)The detail structural design was performed considering the fabrication and the

site installation schedule.

(2)The mechanical strength for the internal and the external pressure were

assessed. The integrity of the suppression tank is verified. In addition, the

structure of bellows and rapture disk are determined.

(3)The procedure of tank assemble/disassemble are verified

(4)The procedure and schedule of shop fabrication, installation and testing were

studied.

(5)The future study and development items are listed.

Acknowledgement

The authors would like to express their sincere appreciation to Drs. M. Ohta, T.

Nagashima, S. Matsuda and Y. Seki for their continuous guidance and encouragement.

They also would like to acknowledge all of members who supported this work.

- no -

JAERI-Tech 99-026

Attachment

Cryostat and Suppression Tank Drawings

in -

This is a blank page.

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vert* covtn u^pri rott

OUTSIDE VIEW SECTIONAL VIEW

NOTE

ATTACH.1-1

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ITER CRYOSTAT MAIN CHAMBER AND VACUUM VESSEL PRESSURE SUPPRESSION SYSTEM DESIGNa I'

iter cryostat main chamber and vacuum vessel pressure

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