ML16198A001

07/18/2016 Presentation Slides from Public Meeting Regarding Calvert Cliffs GSI-191 Resolution Update

ML16198A001
Person / Time
Site:	Calvert Cliffs
Issue date:	07/18/2016
From:	Kimberly Green Calvert Cliffs
To:	Richard Guzman Plant Licensing Branch 1
Guzman R
References
Download: ML16198A001 (14)

Text

Calvert Cliffs GSI-191 ProgramZone of Influence, Debris Size Distribution, Option 2b Closure Approach, andLAR Exemption RequestJuly 18, 2016 AgendaIntroductions Objectives for MeetingOption 2b Simplified Risk-Informed Closure PlanStrainer Performance CriteriaLOCA Frequency AllocationLAR Exemption RequestZone of Influence and Debris Size DistributionStaff Questions & ConcernsSchedule for Future Periodic Meetings Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan1 CCNPP AttendeesDoug LauverSenior Engineering ManagerAndre Drake Lead Responsible Engineer GSI-191Jim Landale Lead PRA EngineerKen Greene Licensing EngineerCraig Sellers Project Manager GSI-191Eric Federline Project SupportCalvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan2 Objectives of this MeetingDiscussion of Calvert Cliffs Simplified Risk-Informed ApproachStrainer Performance CriteriaLOCA Frequency AllocationLAR Exemption RequestDiscussion of Revised ZOIs and Debris Size DistributionsCapture Staff Issues and ConcernsDiscuss Next StepsCalvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan3 Simplified Risk-Informed ApproachStrainer Performance CriteriaStrainer Failure Modes:Pump NPSHStructural FailureDeaeration Limiting Failure ModeStrainer Performance Criteria1) Mass of Fine Fiber Debris2) Mass of Particulate Debris3) Mass of WCAP-16530 Chemical Precipitate Debris*1/16Preliminary Results7 of 19 Exceed only Precipitate CriterionEquivalent Uniform Fiber Bed Thickness ~1/231/28Insufficient Debris Bed to Capture PrecipitateNo Threat to Strainer PerformanceCalvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan4 Simplified Risk-Informed Approach (continued)Calculate CDF Preliminary ResultsUse Conservative ApproachSmallest break that threatens strainer performance DEGBNUREG-1829 LOCA FrequenciesEqually Apportion LOCA Frequency Across RCS WeldsDegradation mechanisms are Design and Construction for all 62 RCS weldsPWSCC also on 8 RCS weldsNUREG-1829 LOCA Frequencies19 Welds 3 are DM Welds Double CountedCalvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan5Log-Linear InterpolationLOCA CategoryBreak Size (in.)Geometric Mean1Arithmetic Mean211.90E-031.00E-0221.6254.20E-043.00E-0331.60E-057.30E-05471.60E-069.40E-0652.00E-072.40E-066312.90E-081.50E-06Notes:[1] Taken from Table 7-19 of NUREG-1829 [2] Taken from Table 7-13 of NUREG-1829LOCA CategoryBreak Size (>in.)Geometric MeanArithmetic Mean11.90E-031.00E-0221.6254.20E-043.00E-0331.60E-057.30E-05471.60E-069.40E-0652.00E-072.40E-065.53.25E-081.54E-066312.90E-081.50E-06# Welds#FailedCDF GMCDF AM62221.15E-085.47E-07 Simplified Risk-Informed Approach (continued)License Amendment RequestCalvert Cliffs Planning to Request Exemption from 10CFR50.46(a)(1.)Similar to South Texas ProjectCalvert Cliffs not licensed to 10CFR50 Appendix A General Design CriteriaDo not need exemption from GDCCalvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan6 Zone of Influence & Debris Size DistributionCCNPP Submitted Supplemental Response to GL 2004-02 on June 8, 2016Addressed Revised ZOI and Debris Size Distributions for:NUKON & Thermal Wrap Blanket InsulationMineral Wool Insulation in Stainless Steel CassettesGeneric Fiberglass InsulationLead Wool Shielding BlanketsBased on data accepted at other plantsCalvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan7 ZOI & Debris Size Distribution NUKON & Thermal Wrap3 Zones of Influence, 4 Debris Size DistributionENERCON Approach using Insulation CentroidBased on NEI 04-07 Safety Evaluation GuidanceAccepted at Other PlantsCalvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan8Debris SizeAverage (Centroid) Distance from Break Location to Target0D 4D ZOI4D 15D ZOI15D 17D ZOIFines Fraction (Ffines)Ffines= 0.2Ffines= -0.01364 xC + 0.2546 Ffines= -0.025 xC + 0.425Small Pieces Fraction (Fsmalls)Fsmalls = 0.8Fsmalls = -0.0682 xC + 1.0724Fsmalls = -0.025 xC + 0.425Large Pieces Fraction (Flarge)Flarge = 0Flarge = 0.0393 xC 0.157Flarge = -0.215 xC + 3.655Intact Pieces Fraction (Fintact)Fintact = 0Fintact = 0.0425 xC 0.170Fintact= 0.265 xC 3.505 ZOI & Debris Size Distribution Mineral WoolMineral Wool at CCNPP is Transco Stainless Steel Cassette Design-Installed in PlantTested at CEESI, Tests 22-1 to 22-3Tested cassettes contained metal foil and produced none or very little transportable debris. The contained material contributes no strength to the cassettes. Therefore, the destruction pressure for the Transco mineral wool cassettes and RMI cassettes are considered equal. To account for the difference in filler material, the ZOI for the mineral wool cassettes will be conservatively increased by a factor of 2 from 2.0D to 4.0D. The debris size for the mineral wool will be conservatively assumed to be 100% fine fibers.Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan9 ZOI & Debris Size Distribution Generic FiberglassAnti-Sweat Insulation on Unit 1 CCW pipingMolded of heavy density resin bonded inorganic glass fibersBulk density generally greater than Nukon and Thermal Wrap. 3.5 to 5.5 lbm/ft3verses 2.4 lbm/ft3The mass percentage of generic fiberglass relative to total fibrous debris load is <20% for the bounding break at Calvert Cliffs.Calvert Cliffs assumes that the ZOI and debris size distribution for generic fiberglass is that used for Nukon and Thermal Wrap based on the insulation density.Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan10 ZOI & Debris Size Distribution Lead Wool Shielding BlanketsTwo Zones of Influence, 3 Debris Size DistributionZOI based on CESSI Air Jet Impact TestsTypical Installed ConfigurationCalvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan11Debris TypeSizeSize Distribution2.1D ZOI2.1D 5.4D ZOILead Blanket CoverLayers Closest to Pipe Break(Open Back Configuration)Fines20%0%Small Pieces80%0%Large/Intact Pieces0%100%Remaining Lead Blanket Cover Layers(Open Back Configuration)Fines0%0%Small Pieces0%0%Large/Intact Pieces100%100%Wrapped Lead Blanket Cover Layers(Strong Back Configuration)Fines0%0%Small Pieces0%0%Large/Intact Pieces100%100%

Questions/ConcernsJointly Review Issues, Questions, and Concerns for Future CommunicationCalvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan12 Next StepsFinalize Update of Deterministic CalculationsPresent Formal Risk-Informed GSI-191 Analysis and ResultsDesire Next Meeting 4Q 2016Calvert Cliffs Chemical Effects Testing & Option 2b Refined Closure Plan13