ML16104A382

North Anna New Fuel Storage Rack & SFP Criticality Analysis for April 26th 2016 Scheduled Category 1, Pre-Submittal Public Teleconference

ML16104A382
Person / Time
Site:	North Anna
Issue date:	04/26/2016
From:	Dominion
To:	Office of Nuclear Reactor Regulation
Sreenivas V
References
Download: ML16104A382 (9)

Text

North Anna Power StationNew Fuel Storage Rack and Spent Fuel Pool Criticality AnalysisProposed License Amendment RequestNRC Pre-Submittal MeetingApril 26, 2016 AgendaCurrent NAPS SFP Configuration Proposed ChangesAnalysis GoalsCriticality Analysis ChecklistConservatismConclusion/Timeline 2 2 Current NAPS SFP ConfigurationOne rack cell design, 4.6 w/o U

-235 maximum enrichment, 1737 total cellsFlux-trap with Boraflex, 10.56 inch pitch

-No credit for Boraflex

-Credit for soluble boron Region 1 (4 out of 4 storage, one burnup curve)Region 2 (5x5, one empty cell, one burnup curve)

-Cell blocker in center cell 3 3 Current NAPS SFP Configuration (cont'd.)Current Region 2 (5x5) 4 4 Proposed ChangesIncrease enrichment limit to 5.0 w/o U

-235-Enhance core design flexibilitySimplify Region configurationRegion 1-2 out of 4 storage, no burnup requirementRegion 2-4 out of 4 storage

-One burnup curve for low decay time

-One burnup curve for 3 year decay timeNo installed neutron absorber credit 5 5 Analysis GoalsIncorporate recent criticality issues and improvementsIncrease identified marginConsistent with the Criticality Analysis Checklist 6 6 Criticality Analysis Checklist*Follows expected criticality analysis report formatIncludes placeholders for analysis Scope, Methods, and DetailsShaded bars indicate major SectionsIndentation indicates a subtopic

-Element within a topic or groupIndicates some elements NOTincluded or NOTapplicable

-Justification or explanation provided 7* Previously provided to NRC Staff; Available upon request ConservatismNRC reserved to account for minor current and/or emergent methodology issues and uncertaintiesIdentify Dominion retained margin to allow for future design changes and/or methodology issues 8 8 Conclusion / TimelineA North Anna SFP and new fuel rack criticality analysis License Amendment Request will seek to increase maximum fuel enrichment, simplify storage configurations, and increase identified margin to kefflimitsMajor milestones:

-Submit LAR to NRC Sept 2016-Receive SER Sept 2018-Shuffle fuel 4 Q 2018-Implement new TS 4 Q 2018 9 9 North Anna Power StationNew Fuel Storage Rack and Spent Fuel Pool Criticality AnalysisProposed License Amendment RequestNRC Pre-Submittal MeetingApril 26, 2016 AgendaCurrent NAPS SFP Configuration Proposed ChangesAnalysis GoalsCriticality Analysis ChecklistConservatismConclusion/Timeline 2 2 Current NAPS SFP ConfigurationOne rack cell design, 4.6 w/o U

-235 maximum enrichment, 1737 total cellsFlux-trap with Boraflex, 10.56 inch pitch

-No credit for Boraflex

-Credit for soluble boron Region 1 (4 out of 4 storage, one burnup curve)Region 2 (5x5, one empty cell, one burnup curve)

-Cell blocker in center cell 3 3 Current NAPS SFP Configuration (cont'd.)Current Region 2 (5x5) 4 4 Proposed ChangesIncrease enrichment limit to 5.0 w/o U

-235-Enhance core design flexibilitySimplify Region configurationRegion 1-2 out of 4 storage, no burnup requirementRegion 2-4 out of 4 storage

-One burnup curve for low decay time

-One burnup curve for 3 year decay timeNo installed neutron absorber credit 5 5 Analysis GoalsIncorporate recent criticality issues and improvementsIncrease identified marginConsistent with the Criticality Analysis Checklist 6 6 Criticality Analysis Checklist*Follows expected criticality analysis report formatIncludes placeholders for analysis Scope, Methods, and DetailsShaded bars indicate major SectionsIndentation indicates a subtopic

-Element within a topic or groupIndicates some elements NOTincluded or NOTapplicable

-Justification or explanation provided 7* Previously provided to NRC Staff; Available upon request ConservatismNRC reserved to account for minor current and/or emergent methodology issues and uncertaintiesIdentify Dominion retained margin to allow for future design changes and/or methodology issues 8 8 Conclusion / TimelineA North Anna SFP and new fuel rack criticality analysis License Amendment Request will seek to increase maximum fuel enrichment, simplify storage configurations, and increase identified margin to kefflimitsMajor milestones:

-Submit LAR to NRC Sept 2016-Receive SER Sept 2018-Shuffle fuel 4 Q 2018-Implement new TS 4 Q 2018 9 9