imq powners industry plan to assess clad performance ... · * industry leadership met to determine...
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PWROG BWROWNERS" GROUP
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Owners
Industry Plan to Assess CladPerformance Margins for LOCA
PWR and BWR Owners GroupsNRC Public Meeting
August 12, 2010
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Agenda
* Presentation Objectives" Background* Industry Response Activities" Industry Participation* Industry Approach" Milestones/Targets
* Anticipated Deliverables* Advantages* Conclusion
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Presentation Objectives
* Provide an overview of industry planto provide an assessment of clad performancemargins in response to NUREG/CR-6967research findings.
* Present the project scope, process,and deliverables.
schedule
1 Receive feedback on project plan.
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Background
* NRC LOCA research program identifiedpreviously unknown embrittlementmechanisms.
" NRC determined current 50.46(b) criteriaare not consistent with new high-burnupresearch findings.
* NRC requested plant-specific informationto support initial safety assessment(ML090340073) of sufficient cladperformance margin.
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Industry Response Activities
Post - NRC April 28-29 2010 Workshop:* NEI followed up with NRC on information requests and
options for an industry response." Requests for clad performance margin assessments
conveyed to PWROG/BWROG (project authorizationsinitiated).
* Industry leadership met to determine clad performancemargin assessment scope, resource requirements,implementation and coordination logistics.
" PWROG/BWROG developed plan for clad performancemargin assessments as the first piece of industry plan tosupport 50.46(b) rulemaking and implementation.
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Industry Participation" NEI - Policy, NRC Interface, Consensus
" RegTAC (EPRI-FRP) - Performance-basedrule language, fuel performance research, collaborationwith vendor test programs.
° PWR Owners Group - Joint clad performanceassessment project, 69 reactors.
° BWR Owners Group - Joint clad performanceassessment project, 35 reactors.
" Fuel Vendors: AREVA, GEH/GNF, Westinghouse -
Project management, clad performance assessments.
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Industry Approach toClad Performance Margin Assessment
" Compile essential information for LOCA Analysesof Record: PCT; Max. Local Oxidation; Times above transitiontemperature; Evaluation Models.
* Group plants by key design basis features(e.g., NSSS type, fuel design, methodology).
" Identify plant and fuel cladding information that allowsconservatisms to be quantified/justified (e.g., App. K tobest-estimate LOCA methods; credits for LBLOCARedefinition where applicable).
" Perform additional sensitivity studies to evaluate otherconservatisms, if necessary.
" Complete report and provide to NRC.
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General Approach forClad Performance Margin Assessment
LOCA Criteria, ECR vs Hydrogen
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16 - • N
14 N N -- N-- Proposed Limits I
0wj 8
6-
4 i2
00 100 200 300 400 500 600 700 800 900
Cladding Hydrogen, ppm
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Illustration of Approach - Group A(Max. ECR = 10%, Older BE Method)
LOCA Criteria, ECR vs Hydrogen
18
16
14
12
10
8
- Proposed Limits
Current Limit f
0LU
6
4
2
00 100 200 300 400 500 600 700 800 900
Cladding Hydrogen, ppm
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Milestones/Targets
* Develop project scope, resource requirements, andfunding requests - Complete
* PWROG/BWROG authorize projects - T= 0(Target September 2010)
* Vendors compile plant data - T+2 months* Vendors group plant data, perform sensitivity studies, assess
conservatisms - T+3 months* Vendors issue draft clad performance margin assessment report to
PWROG/BWROG forreview - T+4 months (January 2011)
* Vendors/OGs resolve comments - T+5 months(February 2011)
* NEI provides Clad Performance Margin Assessment toNRC - T+6 months (March 2011)
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Anticipated Deliverables
For Each Plant Grouping:* Define group populations* Estimated PCT value(s) w/ credits" Estimated %ECR margin(s) w/ credits
* Time above 800 0C (breakaway oxidation)* Basis for acceptability of credits
" Inputs/assumptions needed to define cladperformance margins, if required
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Advantages to Project Approach
* Efficient use of vendor, industry resources.
" Consistent approach for plants with similarmethods, systems, fuel designs, licensingbases.
" Supports implementation planning andresource management.
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Conclusion
Industry project will provide a timelyassessment of clad performance marginsin response to NUREG/CR-6967 researchfindings.
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