ML13023A412

01/23/13 Slides for Meeting with Tennessee Valley Authority Tpbar Loading Increase LAR Pre&#8208, Submittal Meeting Watts Bar Nuclear Plant, Unit 1

ML13023A412
Person / Time
Site:	Watts Bar
Issue date:	01/23/2013
From:	Tennessee Valley Authority
To:	Plant Licensing Branch II
Hon, Andy
Shared Package
ML13023A417	List: ML13023A412
References
Download: ML13023A412 (22)

Text

NlWattsBarTPBARLoadingIncreaseLARPreSubmittalMeetin g N uc l ear gJanuary23,2013 A g enda Nl g N uc l earIdi TCibb*Intro d uct i onT erryC r ibb e*BackgroundMarkBurzynski*DOETPBAR Loading Plans Curtis Chambellan

• DOETPBARLoadingPlans CurtisChambellan

• TritiumPermeationExperienceLarryBagaasen*Pro jectedPathwa yEx posuresMarkBurz y nski j y p y*PlantModificationsJeffMcGuire*LicensingActivitiesMarkBurzynski*PostLOCAShutdownMarginAnalysisGreggSwindlehurst

• LicensingActivitiesScheduleTerryCribbe 2*ClosingCommentsTerryCribbe Introduction Nl N uc l ear*PurposeofMeeting-UpdateNRCManagementonTVA'sPlantoSubmitaLicenseAmendmentRe quest(LAR)inJune2013toq ()IncreaseAllowableTPBARLoadingforWattsBarUnit1 3 Back ground Nl g N uc l ear*Background

-LicenseAmendment40IssuedonSeptember23,2002AuthorizedLoadingUpto2304TPBARs*Allowed LoadingSubsequentlyReduced toAddressPost*AllowedLoadingSubsequentlyReducedtoAddressPostLOCAShutdownMarginIssues-TVALetterDatedMarch22,2005NotifiedNRCofInterimCumulativeTPBARTritiumReleaseLimits*WhileHigherthanProjectedPermeationRateswereInvestigatedInvestigated-LicenseAmendment77IssuedonMay4,2009AuthorizedLoadingUpto704TPBARs4 DOETPBARLoadin gPlans Nl g N uc l ear*DOETPBARLoadingPlansforWattsBarUnit1:CycleDateTPBARLoadingTechSpecLimit C11 April 2011 544 704 C11 April2011 544 704C12October2012544704C13April2014544704704C14October2015110410241696*C15April2017150414241696*C16October201816961696*

5*Proposed TritiumPermeation Experience (1/2)Nl Experience(1/2)N uc l ear*TVAandPNNLPerformedSurveillanceOfEstimatedTritiumPermeationOverLast6C y clesofTPBARIrradiationfortheTritiumyReadinessProgram.-PermeationWasHigherthanOriginalDesignGoal,ButNoDesignorProductionFlawsHaveBeenIdentified.Utit b U ncer t a i n t ybarsrepresent90%confidenceinterval6 TritiumPermeation Experience (2/2)Nl Experience(2/2)N uc l ear*OriginalFunctionalRequirementforTPBARTritiumPermeationinCycle6wasanAverageof1Ci/TPBAR/Yea r.*RadionuclideReleasestoEnvironmentatWBN 1willbeManagedtoMeetNRCRequirementsin10CFRPart20and10CFRPart50AppendixI.-ProposedManagementStrategyAssumesTPBARTritiumPermeationwillbe5.0Ci/TPBAR/year Ci/TPBAR/year

.7*Projected Pro jectedPathwa yEx posure(1/2)Nl j y p ()N uc l ear*FSARChapter11RadiologicalConsequenceAnalysesWillBeBasedon:-ReleaseSourceTermBasedonNRCNUREG 0017MethodologytoCalculateanAverageMaximumHypotheticalRelease-TPBAR Loading of 1700TPBARsTPBARLoadingof1700TPBARs-TPBARTritiumPermeationRateof5Curies/TPBAR/Year(BasedonConservativeUpperBoundofPlantData)-UseofTVAQAComputerCodesGELCandQWATAtoCalculateDosetoMaximumExposedOffsiteIndividual 8

Pro jectedPathwa yEx posure(2/2)Nl j y p ()N uc l ear*ProjectedPathwayExposurestoMaximumHypothetical IndividualRemain BelowNRCRegulatoryHypotheticalIndividualRemainBelowNRCRegulatoryLimitsforAllCases.PathwaysPreliminaryProjectedDoses Liquid(Realistic)0.75mremTotalBody Liquid(Design)0.81mremTotalBody129mremTotal Body Gaseous(Realistic) 1.29mremTotalBody 10.86mremCriticalOrgan Gaseous(D es i g n)1.29mremTotalBody*ApplicableNRCRequirements(10CFRPart20and10CFR Pt 50Adi I)dThilSifiti Gaseous(esg)11.34mremCriticalOrgan 9 CFR P ar t50A ppen di xI)an dT ec h n i ca lS pec ifi ca ti onsWillBeMetforAllCases.

PlantModifications(1/2)Nl ()N uc l ear*Additionof500,000GallonTritiatedWaterTankSystem-IncreaseFlexibilitytoManageRCSFeedandBleedUnderContingencyScenariosandTimeEffluentReleasestoEnvironment

-AllowsChangestoOperatingStrategyforRCSFeedandBleedtoKeepTritiumConcentrationsLowandSimplifyOccupationalExposureControlsSimplifyOccupationalExposureControls-Implementedunder10CFR50.59 10 PlantModifications(2/2)Nl ()N uc l ear*ReplaceCheckValvesUsedforThermalReliefonERCWSupplyLineswithreliefValves-EliminatesPostLOCAManualOperatorActionsforIsolationPreviouslyApprovedbyNRCinLicenseAmendmentIssuedonMarch29,2004-Eliminates40GPMSourceofUnboratedWaterLeakageintoContainment(Assumedfor16Hours)Ild d 10 CFR5059-I mp lemente dun d er10CFR 50.59 11 Licensin gActivities Nl g N uc l ear*UpdateLetterRemovingInterimLimitonTritiumReleasesAttributed toTPBARs(Update toMarchReleasesAttributedtoTPBARs(UpdatetoMarch22,2005Letter)-ReturntoNormalEffluentControlsof10CFRPart20,0 0 di dhilSifii 1 0CFRPart5 0Appen di xI,an dTec h n i ca lS pec ifi cat i ons-WouldIncludeGeneralDiscussionofExpectedEffluentReleasesfor704TPBARs*LicenseAmendmentRequestfor1696TPBARs-UpdateofPostLOCAReactivityAnalysisPreviouslyApproved byNRCfor LicenseAmendment 77ApprovedbyNRCforLicenseAmendment77-WouldIncludeDiscussionofExpectedEffluentReleases(UsingRealisticSourceTerm)andRadwasteSystemDi dStti D(Ui Di Bi S 12 D es i gnan dSt a ti onD ose(U s i ngD es i gnB as i sSourceTerm)for1696TPBARs PostLOCAShutdownMarginAnalysis (1/5)NlMarginAnalysis(1/5)N uc l ear*PostLOCAReactivityAnalysiswillBeConsistentithPil Ad bNRC f Li w ithPrev i ous l yApprove db yNRCf orLi censeAmendment77withtheFollowingKeyChanges:-Elimination of Dilution of SumpWaterfrom 40 GPMEliminationofDilutionofSumpWaterfrom40GPMUnboratedWaterInLeakage-ReduceRequiredRCSBoronConcentrationbyIncreasedIFBALoading

-ModificationofSimplifiedAssumptionsonTPBARLithium Leaching at Time of Hot LegSwitchover LithiumLeachingatTimeofHotLegSwitchover

.*TimeDependentLeachingRateUsed*Preliminar yResultsShowSufficientShutdown13 yMarginfor1696TPBARs PostLOCAShutdownMarginAnalysis (2/5)NlMarginAnalysis(2/5)N uc l ear*XenonFreePostLOCA-RSACItem3.16BPreLOCAC b (ppm)PostLOCAC b (ppm)Limit (ppm)Margin (ppm)HFPEQXEC b=1200ppm(lessIFBA)544TPBARs93718912176285 1696TPBARs95321702178 8 HFPEQXEC b=900ppm(moreIFBA)1696TPBAR*Conclusion:900ppmcorewith1696TPBARscan1696TPBAR s73620062148142 14 ppaccommodatecyclevariations PreliminaryResults PostLOCAShutdownMarginAnalysis (3/5)NlMarginAnalysis(3/5)N uc l ear*HotLe gSwitchover-RSACItem3.16A gPreLOCAC b (ppm)PostLOCAC b (ppm)Limit (ppm)Margin (ppm)HFPEQXE C b=1200 ppm (lessIFBA)HFPEQXEC b=1200ppm (lessIFBA)544TPBARs937189120091181696TPBARs95321702012 158 HFPEQXEC b=900ppm(moreIFBA)1696TPBARs-50%Leach(Max)73620061966 40 1696TPBAR*Conclusion:

1696TPBARcore at 900 ppm with 1696TPBAR s-3%Leach(TimeDependent)7361897196669 15

Conclusion:

1696TPBARcoreat900ppm withtimedependentleachratemeetsrequirements.PreliminaryResults PostLOCAShutdownMarginAnalysis (4/5)NlMarginAnalysis(4/5)N uc l ear*Cold Le gRecirculation-RSACItem3.11B gPreLOCAC b (ppm)PostLOCAC b (ppm)Limit (ppm)Margin (ppm)HFPEQXEC b=1200ppm(lessIFBA)544TPBARs93718912115224 1696TPBARs95321702119 52 HFPEQXEC b=900ppm(moreIFBA)*Conclusion:1696TPBARs ,900ppmcoremeets1696TPBAR7352006206458 16 , pprequirements.

PreliminaryResults PostLOCAShutdownMarginAnalysis (5/5)NlMarginAnalysis(5/5)N uc l ear*RefloodRecriticality-RSACItem3.11C PLOCA C LLBLOCAItditSllLBLOCA P reLOCAC b (ppm)LargeLBLOCA (Keff)I n t erme di a t eLBLOCA (Keff)S ma llLBLOCA (Keff)HFPEQXE C=1200 ppm (lessIFBA)HFPEQXEC b=1200ppm (lessIFBA)544TPBARs9370.9393490.9684020.982261 1696TPBARs9530.9640080.990343 1.007126HFPEQXEC b=900ppm(moreIFBA)1696TPBARs-50%Leach(Max)7360.9558940.985144 1.005015*Conclusion:

1696TPBARcore at 900 ppm with time 1696TPBARs-3%Leach(TimeDependent)7360.9485340.9772980.996649 17*Conclusion:1696TPBARcoreat900ppm withtimedependentleachratemeetsrequirements

.PreliminaryResults Licensin gActivitiesSchedule Nl g N uc l ear 18 Closin g Nl g N uc l ear*TVAWillSubmitaLicenseAmendmentRequestf 1696TPBAR i J 2013 f or1696TPBAR si nJ une2013-SupportingAnalyseswillBoundOperatingEi ihTii Pi E xper i encew i t hT r i t i umPermeat i on-SupportingAnalyseswillReflectPlantModificationsMd t I Mi M a d et oIncreaseMarg i ns-AllRegulatoryRequirementsandPlantTechnicalSpecifications will bemet with 1696TPBARCoreSpecificationswillbemetwith1696TPBARCoreDesign 19 Questions NlQuestions N uc l ear 20 Backup Slides NlBackupSlides N uc l ear 21 NlTPBARLeachingTest*Leachin gResultsfromD y namicLeachin gTestonanN uc l ear g y gIrradiatedTPBARSection HotLegSwitchover 1