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U.S. EPR Critical Sections Selection Methodology Meeting
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 1
Joe Harrold, P.E.
Engineering Supervisor
New Plants Deployment
AREVA NP Inc. and the NRCSeptember 18, 2009
ObjectivesTo present the AREVA Critical Section Selection Methodology, focusing on changes and additions made to the methodology to address NRC observations provided during the 19-Jun-09 meeting,
To receive NRC feedback on the proposed FSAR changes provided on 20-Aug-09, and
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 2
To obtain NRC concurrence on the adequacy of the AREVA Critical Section Selection Methodology.
TopicsDefinition of Critical Sections
Three-Tiered Critical Sections Selection Criteria
Qualitatively Defined Critical Sections
Quantitatively Defined Critical Sections
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 3
Supplementary Critical Sections
Overview of Critical Sections
Summary and Conclusion
Definition of U.S EPR Critical Sections
“Critical sections are those portions of individual Seismic Category I structures (i.e., shear walls, floor slabs and roofs, structure-to-structure connections) that are credited in prevention or mitigation of consequences of postulated design basis accidents
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 4
consequences of postulated design basis accidents, or expected to experience the largest structural demands during design basis conditions, or needed for evaluation of an essentially complete design.”
Definition of U.S EPR Critical Sections
“Critical sections are those portions of individual Seismic Category I structures (i.e., shear walls, floor slabs and roofs, structure-to-structure connections) that are credited in prevention or mitigation of consequences of postulated design basis accidents
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 5
consequences of postulated design basis accidents, or expected to experience the largest structural demands during design basis conditions, or needed for evaluation of an essentially complete design.”
Definition of U.S EPR Critical Sections
“Critical sections are those portions of individual Seismic Category I structures (i.e., shear walls, floor slabs and roofs, structure-to-structure connections) that are credited in prevention or mitigation of consequences of postulated design basis accidents
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 6
consequences of postulated design basis accidents, or expected to experience the largest structural demands during design basis conditions, or needed for evaluation of an essentially complete design.”
Definition of U.S EPR Critical Sections
“Critical sections are those portions of individual Seismic Category I structures (i.e., shear walls, floor slabs and roofs, structure-to-structure connections) that are credited in prevention or mitigation of consequences of postulated design basis accidents
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 7
consequences of postulated design basis accidents, or expected to experience the largest structural demands during design basis conditions, or needed for evaluation of an essentially complete design.”
“Once detailed design of Critical Sections is complete, the design for that structure is essentially complete for safety evaluation purposes. Thus, Critical Sections taken as a whole are analytically representative of an “essentially complete” U.S. EPR
Essentially Complete U.S EPR Design
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 8
representative of an essentially complete U.S. EPR design and their structural design adequacy provides reasonable assurance of overall U.S. EPR structural design adequacy.”
Three-Tiered U.S. EPR Critical Section Selection Methodology
The Critical Section Selection Methodology embodies three complimentary approaches:
Qualitative Approach
Quantitative Approach
Supplementary Approach
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 9
Definition of the Qualitative Approach
“The qualitative approach is applied to portions of the U.S. EPR NI Common Basemat Structures that are credited in the risk mitigation of the nuclear power plant under design basis loading conditions to provide protection of public safety
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 10
conditions, to provide protection of public safety through the physical plant boundaries.”
Critical Sections Selected by the Qualitative Approach (8 total)
Reactor Containment Building
(1) Liner Plate
(2) Typical Cylinder Wall & Buttress
(3) Typical Dome & Dome Ring Areas
(4) Connection of Containment Wall to NI Basemat
(5) Equipment Hatch Area
R t B ildi I t l St t
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 11
Reactor Building Internal Structures
(6) Primary Shield Wall/Reactor Vessel Support Area
NI Basemat & Reactor Building Internal Structures Base Slab
(7) Entire basemat
Fuel Building Internal Structures
(18) Spent Fuel Pool Walls and Floor Slab
These are identified by both qualitative and quantitative approaches.
Definition of the Quantitative Approach
“The quantitative approach achieves identification of critical sections by a thorough analysis of force and moment results extracted from portions of the global static model not already
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 12
defined as critical sections by the qualitative approach.”
Critical Sections Selected by the Quantitative Approach (13 total)
Reactor Building Internal Structures
(8) Operating Floor Area
(9) Elevation +1.50m Heavy Slab & Support Walls
(10) SG Cubicle Area Walls
Safeguard Building 2/3 Hardened Shell
(11) Walls from Top of NI Basemat to Grade
Safeguard Building 2/3 Internal Structures
(12) Exterior Walls from Top of NI Basemat to Grade
(13) Floor Slab at Elevation 0.00m
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 13
( 3) oo S ab at e at o 0 00
Safeguard Buildings 1 & 4
(14) Main Steam & Feedwater Valve Room Walls & Slabs
(15) Exterior Walls from Top of NI Basemat to Grade
Fuel Building Hardened Shell
(16) Walls from Top of NI Basemat to Grade
Fuel Building Internal Structures
(17) Major Walls from Top of NI Basemat to Elevation +1.00m
(18) Spent Fuel Pool Walls & Floor Slab
Building-to-Building Connections
(19) RSB Typical Wall Areas & Connection Between RSB Wall and SB/FB Roof Slabs
Reactor Shield Building:
(20) Typical Dome to Wall Transition Areas
U.S. EPR Critical Sections Selection Methodology-Supplementary Approach
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 14
Se-Kwon Jung, Ph.D., P.E.
Civil/Structural Engineer
New Plants Deployment
Selection of Supplementary Critical Sections for the U.S. EPR
Critical Sections by the Qualitative and Quantitative Approaches
Most parts of the RCB and NI Basemat are covered by the qualitatively defined critical sections.
Limited portions of the RBIS, SBs, and FB are identified as quantitatively defined critical sections.
No critical sections are identified for non-NI Seismic Category I structures.
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 15
Supplementary Critical Sections
Sections that constitute significant portions of the Seismic Category I structures in terms of their physical dimensions (i.e., wall and slab surface areas).
Sections that serve as major lateral and gravity load resisting structural elements for non-NI Seismic Category I structures (i.e., Emergency Power Generating Building (EPGB) and Essential Service Water Building (ESWB)).
Surface Area Comparisons for Critical Sections and U.S. EPR Structures
»Ratio of Sum of Surface Areas of NI Critical Sections to Total Surface Area of NI Structures,
NI Area Ratio 1 = 29 %
»Ratio of Sum of
RBIS Slab 8 & 9 0.33 0.75
RBIS Wall 9 & 10 0.12 0.63
SB23 Slab 13 0.13 0.15
SB23 Wall 12 0.07 0.26
NI Building Name
Slab/Wall
CriticalSections
Surface Area Ratio 1*
Surface Area Ratio 2**
RSB Slab/Wall 19 & 20 0.48 1.00
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 16
»Ratio of Sum of Surface Areas of All Sections Typified by Critical Sections to Total Surface Area of NI Structures,
NI Area Ratio 2 = 57 %
SB23S & FBS
Slab 19 0.30 0.58
FBS Wall 16 0.13 0.73
FB Wall 17 & 18 0.19 0.69
FB Slab 18 0.05 0.05
SB1 & SB4 Slab 14 0.06 0.07
SB1 & SB4 Wall 14 & 15 0.18 0.65
*: Ratio of Sum of Surface Areas of Critical Sections to Total Surface Area of NI Structure
**: Ratio of Sum of Surface Areas of All Sections Typified by Critical Sections to Total Surface Area of NI Structure
Additional candidate critical sections necessary to increase coverage areas
30 cm thick walls for SB23
50 cm thick slabs for SB23
40 and 50 cm thick slabs for FB
50 cm thick slabs for SB1 and SB4
Supplementary critical sections selected
Selection of Supplementary Critical Sections for the U.S. EPR
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 17
Supplementary critical sections selectedSafeguard Building 2/3 Internal Structures
• (21) Floor Slab at Elevation -5.00mFuel Building Internal Structures
• (22) Floor Slab at Elevation -6.20mSafeguard Building 2/3 Internal Structures
• (23) Shear Wall Next to RSB
Ratio of sum of surface areas of all sections typified by NI critical sections to total surface area of NI structures
NI Area Ratio 2 = 77 %
Critical Sections 21: Safeguard Building 2/3 Internal Structures – Floor Slab at Elevation -5.00m
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 18
Critical Section 22: Fuel Building Internal Structures – Floor Slab at Elevation -6.20m
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 19
Critical Section 23: Safeguard Building 2/3 Internal Structures – Shear Wall Next to RSB
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 20
Emergency Power
Generating Building
Plan View Elevation ViewBuilding
A A’
<A A’>
(EPGB)
Critical Sections for EPGB and ESWB – Plan and Elevation Views
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 21
B
B’
<A-A >
<B-B’>4 ESWB Critical Sections (Critical Sections 29 Thru 32)
Essential Service Water
Building
5 EPGB Critical Sections (Critical Sections 24 Thru 28)
(ESWB)
ABCDEFGHJ
CS 24
CS 26: Reinforced Concrete Slab and Composite Beams at Elevation 51’ – 6”
CS 26
CS 27: Shear Wall on Column Line C
CS 27
CS 28: Emergency Power Generating Building – Shear Wall on Column Line E
CS 28
CS 25
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 22
CS 24: Emergency Power Generating Building –Basemat Foundation at Elevation – 0’-0”
EPGB - Elevation
A BC D E F G
H J
11
12
13
14 EPGB Pl Vi
CS 24CS 25: Emergency Power Generating Building –
Shear Wall on Column Line 11CS 25CS 26CS 27CS 28
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 23
CS 27: Emergency Power Generating Building –Shear Wall on Column Line C
CS 28: Shear Wall on Column Line E
14
15
16
17
18
19
EPGB – Plan View
1 2 3 4 5 CS 29
CS 30: Shear Wall on
CS 30
CS 31: Fan Deck Slab at Elevation 63’ - 0”
CS 31CS 32
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 24
ESWB – Elevation
CS 29: Essential Service Water Building –Basemat Foundation at Elevation – 16’-0”
CS 30: Shear Wall on Column Line 4
3
4
5
ESWB – Plan View
CS 29CS 30CS 31
CS 32: Essential Service Water Building – Shear Wall on Column Line D
CS 32
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 25
CS 30: Essential Service Water Building – Shear Wall on Column Line 4
B ACDEF
1
2
Critical Sections for EPGB and ESWB and Surface Area Comparisons
EPGB & ESWB Critical Sections Identified by the Supplementary Approach (9 total)
Emergency Power Generating Building
• (24) Basemat Foundation at Elevation 0’-0”• (25) Shear Wall on Column Line 11• (26) Reinforced Concrete Slab and Composite Beams at Elevation 51’-6”• (27) Shear Wall on Column Line C• (28) Shear Wall on Column Line E
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 26
• (28) Shear Wall on Column Line EEssential Service Water Building
• (29) Basemat Foundation at Elevation 16 ft - 0 in• (30) Shear Wall at Column Line 4• (31) Fan Deck Slab at Elevation 63 ft – 0 in• (32) Shear Wall on Column Line D
Ratio of sum of surface areas of EPGB & ESWB critical sections to total surface area of EPGB & ESWB, EPGB & ESWB Area Ratio 1 = 43 %
Ratio of sum of surface areas of all sections typified by EPGB & ESWB critical sections to total surface area of EPGB & ESWB, EPGB & ESWB Area Ratio 2 = 100 %
Critical Sections Identified by the Supplementary Approach (12 Total)
Safeguard Building 2/3 Internal Structures
(21) Floor Slab at Elevation -5.00m
Fuel Building Internal Structures
(22) Floor Slab at Elevation -6.20m
Safeguard Building 2/3 Internal Structures
(23) 0.30m Thick Shear Wall Next to RSB
Emergency Power Generating Building
»Ratio of Sum of Surface Areas of All Sections Typified by Critical Sections to Total Area of U.S. EPR Structures,U.S. EPR Area Ratio 2 = 84 %
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 27
(24) Basemat Foundation at Elevation 0’-0”
(25) Shear Wall on Column Line 11
(26) Reinforced Concrete Slab and Composite Beams at Elevation 51’-6”
(27) Shear Wall on Column Line C
(28) Shear Wall on Column Line E
Essential Service Water Building
(29) Basemat Foundation at Elevation 16 ft - 0 in
(30) Shear Wall at Column Line 4
(31) Fan Deck Slab at Elevation 63 ft – 0 in
(32) Shear Wall on Column Line D
Overview of Critical Sections for NI Common Basemat Structures
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 28
NI Critical Section Overview – 1/3
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 29
NI Critical Section Overview – 2/3
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 30
NI Critical Section Overview – 3/3
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 31
Summary and Conclusion
Definition of critical sections
Three-tiered critical section selection criteria
32 U.S. EPR critical sections identified by qualitative, quantitative, and supplementary approaches
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 32
Essentially complete design of U.S. EPR
Summary of NRC Observations and Resolutions on June 19 Meeting
A. The current methodology is only applied to the NI structures. The scope for selection of the critical sections should consider all Seismic Category I structures.
Critical sections for other Seismic Category I structures are added.
B. The methodology refers to the selection of critical sections “in lieu of a complete design." This does not appear to be consistent with the need to use critical sections to represent an "essentially complete design."
Editorial changes have been made to refer to an essentially complete design as suggested
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 33
suggested.
C. The current methodology in several cases refers to selection of critical sections to address design basis accidents (DBAs) / loss of coolant accidents (LOCAs). AREVA indicated that this should be revised to consider all loads and load combinations that are part of the design basis of the plant.
Revisions have been made as suggested.
D. In addition to using "qualitative" criteria and "quantitative" criteria, AREVA agreed that a third criterion which ensures that an adequate "representation of structural elements" throughout each of the Seismic Category I structures should also be included in the methodology.
Supplementary approach has been added.
Summary of NRC Observations and Resolutions on June 19 Meeting
E. For the AREVA calculation identified above, the critical sections which require approval from the NRC should be identified as Tier 2* not Tier 2.
Correction has been made.
F. For the AREVA calculation identified above, the qualitative criteria should also be applied to the fuel building because one of the functions of this building is to prevent release of radioactive material.
The qualitative approach has been applied to the Fuel Building.
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 34
G. For the AREVA calculation identified above (Section 2.1), the qualitative criteria dealing with the "defense in depth" needs to be revised. The "safety margin" should not be considered to be part of the defense in depth, but rather is in addition to defense in depth.
Editorial changes have been made as suggested.
H. The third criterion consisting of adequate representation of structural elements (see Item D above) should include other types of structural elements and locations not captured by the qualitative and quantitative criteria, such as structural steel members and major discontinuities (e.g., large openings in structural walls/slabs).
Supplementary approach has been added.
Thank you!
Any Questions?
NRC Meeting - U.S. EPR Critical Sections Selection Methodology – Sep 18, 2009 35
Any Questions?
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