ML15005A130
| ML15005A130 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 01/15/2015 |
| From: | Tennessee Valley Authority |
| To: | Farideh Saba Plant Licensing Branch II |
| Saba F DORL/LPL2-2 301-415-1447 | |
| References | |
| Download: ML15005A130 (14) | |
Text
BrownsFerryNuclearPlant ExtendedPowerUprateLicenseAmendmentRequest ApproachtoTreatmentofHydrogenEmbrittlement Issues January15,2015
Agenda
Introductions
OverviewandSchedule 10CFR50.46cRulemaking Proposed10CFR50.46cComplianceActivities andTimeline Treatmentof10CFR50.46cIssuesinExtended PowerUprateLicenseAmendmentRequest ReactivityInitiatedAccidentIssues AcronymList Questions/Comments G. Doyle G.Doyle T.Eichenberg T.Eichenberg T.Eichenberg T.Eichenberg G. Doyle 2
OverviewandSchedule 3
- SupersedespreviousBrownFerryEPUsubmittals
- AddressescurrentBrownsFerryconditionsandlicensingbasis (e.g.,AREVAATRIUM10XMfueltype)
- UsestheformatofRS001,ReviewStandardforExtended PowerUprates
- AddressespreviousapplicableNRCRequestsforAdditional Information(RAIs)
- Appliesimprovedsubmittalverificationprocesstoensure completenessandaccuracy
- Weareheretopresentanddiscussourpositionfor addressinghydrogenembrittlement issuesinorderto precludeimpacttotheBrownsFerryEPULARreview
- Proposed10CFR50.46crulemaking
- ProposedReactivityInitiatedAccidentguidancerevision
OverviewandSchedule(continued) 4
10CFR50.46cRulemaking 5
- 10CFR50.46cRulemakinginProgress
- RevisesEmergencyCoreCoolingSystems(ECCS) acceptancecriteriainlightof:
- NUREG6967/CRresearchfindings Betalayerembrittlementbyoxygen/Betalayerthinning LocalizedHydrogeninducedembrittlementinballoonregion Hydrogenenhancedbetalayerembrittlementbyoxygen Generalhydrogeninducedembrittlementfrombreakawayoxidation Oxygenpickupfromthecladdinginnersurface
- PetitionsforRulemaking(PRM)
PRM5071-eliminateZIRLO'fromrulelanguage PRM5084-effectsofcrudandoxidelayers
- Longtermcooling
10CFR50.46cRulemaking(continued) 6
- Rulemakingissuesnotimmediatesafetyconcern
- BWROwnersGroupMarginAssessment[(BWROG)TP11010]
- OperabilityTypeAnalysis
- Notintendedtobealicensingbasisanalysis
- AppliedtoBWRcurrentoperatingfleet
- SupportedthatRulemakingcanmoveforwardonnormalschedule
- BrownsFerryaddressedinthereport
- DraftRulePublishedSpring2014
- PublicCommentsPeriodClosedAugust21,2014
- TennesseeValleyAuthorityparticipatedinthedevelopmentofthe Industrycomments
- FinalPublicationPossibleasearlyasSpring2016
- NewrulepotentiallyeffectiveduringEPULARreviewperiod
- Underthesecircumstances,NRChasindicateddocketedLARs(involving LOCA)mustbeincompliancewithnewrulepriortofinalapproval
- However,draftrulehasanextendedimplementationscheduleafterthe finalrulepublicationdate
Based,inpart,onresultsofBWROGTP11010
10CFR50.46cComplianceScope 7
BasedonCurrentProposed10CFR50.46c DevelopthefollowingMethodologyReports
- FuelRodThermalMechanicalMethod
Hydrogenuptakemodel
CrudandPreoxidation
- ECCSPerformanceMethod
CathcartPaweltimeattemperaturecorrelation
Interioroxygenuptake
- LongTermCoolingMethod
Unknownrequirementtoday PerformanceandAcceptancemethodsfromscratch
Deterministicdebrismodelforalltimeframes Performancemethodsandacceptancecriteriadevelopment IntersectionwithGSI191relatedprograms
Performfurthermaterialtesting DevelopVendorBreakawayOxidationProgram TechnicalSpecification(TS)5.6.5,CoreOperatingLimitsReport(COLR),
- ReflectnewCOLRmethodssatisfying10CFR50.46c NRCpriorapprovaloftheaboveactivitiesisrequired
10CFR50.46cComplianceTimeline 8
FinalcompliancetosupportEPULARreviewscheduleisanunrealisticexpectation
Treatmentof10CFR50.46cIssuesinEPULAR 9
- BrownsFerryUptoDateMarginAssessment
- AdditionalAnalysesatEPUConditions
- Complimentexistingmarginassessmentreport
- SeparateBrownsFerryanalyses,notpartofBWROG
- SpecificChangesRelativetoExistingMarginReport
- AutomaticDepressurizationSystem(ADS)
Initiationlogicnowsinglefailureproof
- Topdowncorespraylicensingbasisrequirements MethodologyassupplementedbyNRCsafetyevaluationsdatedApril27,2012,and February15,2013
- ATRIUM10XMfuel
- 120%OLTPpowerlevel
Treatmentof10CFR50.46cIssuesinEPULAR (continued) 10 AdditionalAssessmenttoInclude HydrogenPickupEffects ResultswithmodelusedforBWROGTP11010
FRAPCONZr2AlloyHydrogenuptakemodel
[K.GeelhoodandC.Beyer,CorrosionandHydrogenPickupModelinginZirconiumBasedAlloys,PaperNo.8145,Proceedingsofthe2008Water ReactorFuelPerformanceMeeting,October1923,Seoul,Korea(2008)]
ResultswithAREVAmodelcurrentlydocketedforNRCreview
[BAW10247PAR0,Supplement1PR0]
Norequestofplantspecifichydrogenuptakemodelapproval MaximumEquivalentCladdingReacted(ECR)results PeakCladdingTemperaturelimitedbreak
ApplyingCathcartPaweltimeattemperature(2200°Fexperimentalbasis)
Relevantbreakawayoxidationtimeinformation LongTermCoolingAddressedByExistingMethod
[NEDO20566A,AnalyticalModelforLossofCoolantAnalysisinAccordancewith10CFRAppendixK]
TreatmentofLegacyATRIUM10Fuel Legacyfuelshouldbegrandfathered Lastdeliveredreloadisalreadybeingirradiated Fuelwillbelowpowerduringtransition UptodateMarginAssessmentwillprovidereasonableassurance BrownsFerrywillbeabletomeetfinal10CFR50.46crequirementsat EPUconditions
ReactivityInitiatedAccidentIssues 11 ReactivityInitiatedAccident(RIA)
- Plantspecificresponsesneededtoaddressemergingconcerns
- NoRegulatoryGuidanceorStandardReviewPlanwithfinalcriteria
- Approvedmethodsarenotinplaceyettoaddressallemergingissues
- Potentialforunderstandingofphenomena,NRCfocusofconcern, andmethodsofevaluationtoevolveovertime
- NRCpapersuggeststhatemergingRIAissueswillbeaddressedin RAIprocess Ifanexistinglicenseevoluntarilyseeksalicenseamendmentorchangeand (1)theNRCstaffsconsiderationoftherequestinvolvesaregulatoryissue directlyrelevanttoRIAand(2)thespecificsubjectmatterofthisnew guidanceisanessentialconsiderationinthestaffsdeterminationofthe acceptabilityofthelicenseesrequest,thenthestaffmayrequestthatthe licenseeeitherfollowthenewguidanceorprovideanequivalentalternative processthatdemonstratescompliancewiththeunderlyingNRCregulatory requirements.(TheU.S.NuclearRegulatoryCommissionsStrategyforRevisingthe RIAAcceptanceCriteria,Proceedingsofthe2012TopFuelReactorFuelPerformance Meeting,Manchester,UnitedKingdom,September26,2012,PaperA0112)
ReactivityInitiatedAccidentIssues(continued) 12 ReactivityInitiatedAccident
- RIACriteriathatwillbesupportedbyLAR
- Showthatthecurrentradiologicalsourceevaluationboundsthe numberofrodsfailedbasedonpeakradialaveragefuelenthalpyrise criteriaof170cal/g[highcladdingtemperaturefailurecriteriaforzeropowerconditions, currentlyapprovedBrownsFerrymethodology:SER for ANF-89-98(P)(A), Revision 1, Generic Mechanical Design Criteria]
- Showinterimcriteriaforcorecoolabilityof230cal/gpeakaverage fuelenthalpyriseismet
- BrownsFerryDesignBasisiscurrently280cal/g[SER for ANF-89-98(P)(A),
Revision 1, Generic Mechanical Design Criteria]
- CompliancewithotheremergingNRCRIAregulatory requirementswillbedemonstratedasrequestedduringRAI process
- ApproachtoRIAConsistentwithCurrentNRCExpectation
AcronymList ADS-AutomaticDepressurizationSystem AOR-AnalysisofRecord BWR-BoilingWaterReactor BWROG-BWROwnersGroup CFR-CodeofFederalRegulation COLR-CoreOperatingLimitsReport ECCS-EmergencyCoreCoolingSystems ECR-EquivalentCladdingReacted EPU-ExtendedPowerUprate FRN-FederalRegisterNotice GSI-GenericSafetyIssue LAR-LicenseAmendmentRequest LOCA-LossofCoolantAccident LTR-LicensingTopicalReport NRC-NuclearRegulatoryCommission OLTP-OriginalLicensedThermalPower PRM-PetitionforRulemaking RAI-RequestforAdditionalInformation RIA ReactivityInitiatedAccident TS-TechnicalSpecifications 13
14 Questions/Comments