Preliminary T/H Analysesfor EFIT-MgO/Pb Reactor Design

WP1.5 Progress MeetingKTH / Stockholm, May 22-23, 2007

G. Bandini, P. Meloni, M. Polidori

Italian Agency for new Technologies, Energy and Environment,Advanced Physics Technology Division

Via Martiri di Monte Sole 4, 40129 Bologna, Italy

EUROTRANS – DM1

Objectives

Support the design phases of EFIT reactor with safety analysis at nominal and accidental conditions starting from:

development of a Neutronic/Thermal-Hydraulic coupled model of EFIT Subcritical Reactor for PARCS v1.01 /RELAP5 3.2.2 code, just widely used in PDS-XADS project

adaptation of the model for the new versions of the codes to take advantage of the multigroup diffusion equation solution in hexagonal geometry of PARCS v2.4 and the upgrade at the RELAP5 mod3.3

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

EFIT Core Section

Target Unit 19 Central Positions

Active Zone Positions 180

Inner Zone 42 FA

Intermediate Zone 66 FA

Outer Zone 72 FA

Reflector Zone 252 Positions

For Dummy Assemblies and Absorber Elements

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

Target

Inner Fuel

Middle Fuel

Outer Fuel

Box Dummy

Neutronic Design

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

Inner, Mid, Outer zones and dummy+bypass are represented

Average and hot hydraulic channel for Inner, Middle and Outer core with equivalent flow area coupled with corresponding pin heat structures

The hydraulic channels are chocked to correctly distribute mass flowrate

Average pin, hot SA and hot pin modelled with 12 axial nodes to simulate axial and radial power distribution

CERCER Fuel properties for Inner (57%MgO 43%MOX), Middle and Outer (50%MgO 50%MOX) are considered Cladding material is a ferritic-martensitic steel (T91) with aluminium coating

Gap conductivity tuned with SIM-ADS code

Lead heat transfer coefficient Subbotin correlation

RELAP5 Model of EFIT Core

8.0025.00.5 PeNu

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

AREVA Lyon October 10-11 , EUROTRANS – DM 1 - WP 1.5 Progress Meeting

RELAP5 Nodalization Scheme of EFIT Core

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

Upper Branch

Avg

. Ou

ter

Zo

ne

Ref

lect

or/

Byp

ass

Ho

t O

ute

r Z

on

e

Avg

. Mid

Zo

ne

Ho

t M

id Z

on

e

Avg

. In

ner

Zo

ne

Ho

t In

ner

Zo

ne

Lower Branch

tmpdjun

AREVA Lyon October 10-11 , EUROTRANS – DM 1 - WP 1.5 Progress Meeting

Three Zone Core Main ParametersThermo-hydraulic conditions ERANOS MCNPX

Inner Power Middle PowerOuter Power [MWth]

95.98142.3 ~ 379 (5 dissipated)140.5

94.140. ~ 375 (9 dissipated)141.

In/Mid/Out Av. Linear PowerIn/Mid/Out Max. Linear Power

[W cm-1]

151.2/142.6/129.1193.5/185.4/187.1 203./177./197.

T inletT outlet [°C]

400. 480.

In/Mid/Out Radial Form FactorIn/Mid/Out Axial Form Factor

1.12/1.13/1.241.14/1.16/1.17

1.21/1.05/1.101.13/1.18/1.20

Reflector+Bypass Flowrate In/Mid/Out Mass Flowrate Total Mass Flowrate [kg s-1]

12007875/11676/11526

32296

12007794/11609/11692

32296

In/Mid/Out Coolant Velocity [m s -1] ~1.0

In/Mid/Out Core Pressure Drop [kPa] 36

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

RELAP5 Calculations

Steady state calculation at ERANOS Code nominal conditions:- Axial and Radial Form Factor simulated,- 100% Power and Mass Flowrate, - Hot Pin not simulated, - BOC conditions.

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

[MW] Pth1 Pth2 Pth3 PthTOT Pthmax1/FA Pthmax2/FA Pthmax3/FA AvePth1/FA AvePth2/FA AvePth3/FA AvePth/FABOL 95.60 142.54 140.73 378.88 2.49 2.37 2.39 2.28 2.16 1.95 2.10BOC 95.98 142.31 140.48 378.77 2.57 2.43 2.43 2.29 2.16 1.95 2.10EOC 95.11 142.32 141.27 378.70 2.58 2.48 2.47 2.26 2.16 1.96 2.10

Steady state calculation at MCNPX Code nominal conditions:- Axial and Radial Form Factor simulated,- 100% Power and Mass Flowrate, - Hot Pin simulated, - BOC conditions.

MWth Inner zone 94

Intermediate zone 140 Outer zone 141

Out of fuel assemblies 9 Total 384

Max power in assembly:

fuel+coolant+ structures (MWth)

Max power in assembly:

only fuel (MWth)

Hottest pin in the hottest assemblies (only fuel)

(kW)

Axial form

factor in the hottest assemblies

Hottest pin / average pin (inside the

hottest assemblies)

Max linear power in pin

(W/cm) Inner zone 2.46 2.28 16.4 1.13 1.21 203 Mid zone 2.35 2.19 13.7 1.18 1.05 177

Outer zone 2.43 2.29 15.0 1.20 1.10 197

Steady State at ERANOS Nominal Conditions

(*) At max linear power elevation(**) At max core elevation

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

INNER ZONE (Fax = 1.14)

MIDDLE ZONE (Fax =1.16)

OUTER ZONE (Fax =1.17)

Max Temperature

(°C)

Hot FA 1/42 Fr = 1.12

Avg FA 41/42

Hot FA 1/66Fr = 1.13

Avg FA65/66

Hot FA 1/72Fr = 1.24

Avg FA 71/72

Central Fuel (*)

1251 1151 1330 1216 1285 1094

Surface Fuel (*)

874 822 860 807 818 737

Internal clad (**)

538 523 536 520 534 508

External clad (**)

526 513 525 510 525 501

Lead (**)

492 482 493 482 502 482

SS ERANOS Nominal Conditions – Inner Zone

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

Inner Core Temperature Profile (Avg. SA)

0

200

400

600

800

1000

1200

1400

0.00 0.20 0.40 0.60 0.80 1.00Active Height (m)

Tem

pera

ture

(°C

)

FuelCladLead

1151

513

482

Inner Core Temperature Profile (Hot SA)

0

200

400

600

800

1000

1200

1400

0.00 0.20 0.40 0.60 0.80 1.00Active Height (m)

Te

mp

era

ture

(°C

)

FuelCladLead

1251

526

492

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

SS ERANOS Nominal Conditions – Mid Zone

Mid Core Temperature Profile (Avg. SA)

0

200

400

600

800

1000

1200

1400

0.00 0.20 0.40 0.60 0.80 1.00Active Height (m)

Te

mp

era

ture

(°C

)

FuelCladLead

1215

510

482

Mid Core Temperature Profile (Hot SA)

0

200

400

600

800

1000

1200

1400

0.00 0.20 0.40 0.60 0.80 1.00Active Height (m)

Tem

pera

ture

(°C

)

FuelCladLead

1330

525

493

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

Outer Core Temperature Profile (Avg. SA)

0

200

400

600

800

1000

1200

0.00 0.20 0.40 0.60 0.80 1.00Active Height (m)

Te

mp

era

ture

(°C

)

FuelCladLead

1094

501

482

Outer Core Temperature Profile (Hot SA)

0

200

400

600

800

1000

1200

1400

0.00 0.20 0.40 0.60 0.80 1.00Active Height (m)

Tem

pera

ture

(°C

)

FuelCladLead

1285

525

502

SS ERANOS Nominal Conditions – Outer Zone

RELAP5 Calculations

Steady state calculation at ERANOS Code nominal conditions:- Axial and Radial Form Factor simulated,- 100% Power and Mass Flowrate, - Hot Pin not simulated, - BOC conditions.

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

[MW] Pth1 Pth2 Pth3 PthTOT Pthmax1/FA Pthmax2/FA Pthmax3/FA AvePth1/FA AvePth2/FA AvePth3/FA AvePth/FABOL 95.60 142.54 140.73 378.88 2.49 2.37 2.39 2.28 2.16 1.95 2.10BOC 95.98 142.31 140.48 378.77 2.57 2.43 2.43 2.29 2.16 1.95 2.10EOC 95.11 142.32 141.27 378.70 2.58 2.48 2.47 2.26 2.16 1.96 2.10

Steady state calculation at MCNPX Code nominal conditions:- Axial and Radial Form Factor simulated,- 100% Power and Mass Flowrate, - Hot Pin simulated, - BOC conditions.

MWth Inner zone 94

Intermediate zone 140 Outer zone 141

Out of fuel assemblies 9 Total 384

Max power in assembly:

fuel+coolant+ structures (MWth)

Max power in assembly:

only fuel (MWth)

Hottest pin in the hottest assemblies (only fuel)

(kW)

Axial form

factor in the hottest assemblies

Hottest pin / average pin (inside the

hottest assemblies)

Max linear power in pin

(W/cm) Inner zone 2.46 2.28 16.4 1.13 1.21 203 Mid zone 2.35 2.19 13.7 1.18 1.05 177

Outer zone 2.43 2.29 15.0 1.20 1.10 197

Steady State at MCNPX Nominal Conditions(the whole Power generated in fuel pellets)

(*) At max linear power elevation(**) At max core elevation

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

INNER ZONE MID ZONE OUTER ZONE

Max Temp. (°C)

Avg FA

41/42

Hot FA 1/42

Hot PINAvg FA

65/66

Hot FA

1/66Hot PIN

Avg FA

71/72

Hot FA

1/72Hot PIN

ffax=1.13ffrad=1.21

ffax=1.18ffrad=1.05

ffax=1.20ffrad=1.10

Central Fuel(*) 1140 1209 1374 1216 1312 1364 1100 1310 1416

Surface Fuel(*) 815 849 932 806 853 875 738 827 871

Internal Clad(**) 524 539 550 518 532 534 508 533 537

External Clad(**) 513 527 534 509 522 523 501 524 527

Lead(**) 481 489 481 490 481 501

SS MCNPX Nominal Conditions

Inner Zone

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

Inner Core Temperature Profile (Avg. SA)

0

200

400

600

800

1000

1200

0.00 0.20 0.40 0.60 0.80 1.00Active Height (m)

Tem

pera

ture

(°C

)

FuelCladLead

1140

513

481

Inner Core Temperature Profile (Hot SA)

0

200

400

600

800

1000

1200

1400

0.00 0.20 0.40 0.60 0.80 1.00Active Height (m)

Tem

pera

ture

(°C

)

FuelCladLead

1209

527

489

Inner Core Temperature Profile (Hot PIN)

0

200

400

600

800

1000

1200

1400

1600

0.00 0.20 0.40 0.60 0.80 1.00Active Height (m)

Tem

pera

ture

(°C

)

FuelCladLead

1374

534

489

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

SS MCNPX Nominal Conditions

Mid Zone

Mid Core Temperature Profile (Avg. SA)

0

200

400

600

800

1000

1200

1400

0.00 0.20 0.40 0.60 0.80 1.00Active Height (m)

Tem

pera

ture

(°C

)

FuelCladLead

1216

509

481

Mid Core Temperature Profile (Hot SA)

0

200

400

600

800

1000

1200

1400

0.00 0.20 0.40 0.60 0.80 1.00Active Height (m)

Tem

pera

ture

(°C

)

FuelCladLead

1312

522

490

Mid Core Temperature Profile (Hot PIN)

0

200

400

600

800

1000

1200

1400

1600

0.00 0.20 0.40 0.60 0.80 1.00Active Height (m)

Tem

pera

ture

(°C

)

FuelCladLead

1364

523

490

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

SS MCNPX Nominal Conditions

Outer Zone

Outer Core Temperature Profile (Avg. SA)

0

200

400

600

800

1000

1200

0.00 0.20 0.40 0.60 0.80 1.00Active Height (m)

Tem

pera

ture

(°C

)

FuelCladLead

1100

501

481

Outer Core Temperature Profile (Hot SA)

0

200

400

600

800

1000

1200

1400

0.00 0.20 0.40 0.60 0.80 1.00Active Height (m)

Tem

pera

ture

(°C

)

FuelCladLead

1310

524

501

Outer Core Temperature Profile (Hot PIN)

0

200

400

600

800

1000

1200

1400

1600

0.00 0.20 0.40 0.60 0.80 1.00Active Height (m)

Tem

pera

ture

(°C

)

FuelCladLead

1416

527

501

Steady State at MCNPX Nominal Conditions(in the hotpin only the Power generated in pellets)

(*) At max linear power elevation(**) At max core elevation

EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

INNER ZONE MID ZONE OUTER ZONE

Max Temp. (°C)

Avg FA

41/42

Hot FA 1/42

Hot PINAvg FA

65/66

Hot FA

1/66Hot PIN

Avg FA

71/72

Hot FA

1/72Hot PIN

ffax=1.13ffrad=1.21

ffax=1.18ffrad=1.05

ffax=1.20ffrad=1.10

Central Fuel(*) 1305 1294 1344

Surface Fuel(*) 896 845 841

Internal Clad(**) 545 531 535

External Clad(**) 531 521 525

Lead(**) 489 490 501