ML17317A421

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Presubmittal Presentation on New Travelers TSTF-557, TSTF-566, TSTF-568, and TSTF-569 for 11/09/2017 Quarterly Meeting
ML17317A421
Person / Time
Site: Technical Specifications Task Force
Issue date: 11/09/2017
From:
Technical Specifications Task Force
To:
Office of Nuclear Reactor Regulation
Honcharik M
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ML17317A453 List:
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Download: ML17317A421 (35)
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Technical Specifications Task Force A Joint Owners Group Activity TSTF NewTSTFTravelerPresubmittalDiscussion November9,2017 1

Technical Specifications Task Force A Joint Owners Group Activity TSTF PresubmittalDiscussions

  • TheTSTFhasdevelopedfournewtravelers,whichwere providedindrafttothestaff
  • Thepurposeofthediscussionisdoconfirmthatthedraft travelerscontainsufficientinformationtosupportNRCstaff review 2

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF557,Rev.1,"SpentFuelStorageRackNeutronAbsorber MonitoringProgram"

  • Applicabletoallplanttypes
  • OptionalnewTSprogramforplantsrevisingtheirspentfuel poolcriticalityanalysistocreditneutronabsorbers
  • NRCconcernisthattheneutronabsorbingmaterialsusedin somespentfuelpoolsmaydegradedovertimeandshouldbe monitored
  • NRChasbeenrequiringmonitoringrequirementsinnew LARs,buttheapproachesandlevelofdetailwereinconsistent 3

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF557,Rev.1,"SpentFuelStorageRackNeutronAbsorber MonitoringProgram"

  • AttheMay2,2013TSTF/NRCquarterlymeeting,theNRC statedtheTSshouldincluderequirementstomonitorspent fuelpoolneutronabsorbermaterials,andrequestedthatthe TSTFproposeappropriatecontrols
  • TSTFworkedwiththeNEISpentFuelPoolCriticalityTask Force 4

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF557,Rev.1,"SpentFuelStorageRackNeutronAbsorber MonitoringProgram"

  • TherewereaseriesofTSTF/NEI/NRCdiscussions,including discussionatthe2014RegulatoryInformationConference
  • TheTSTFcreatedananalysisofwhetherneutronabsorber monitoringmetanyregulatoryrequirementforaTS

- Concludedthatthereisnoexplicitrequirement,butan AdministrativeControlsprogramwouldnotbeinconsistent withtheexistingTS 5

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF557,Rev.1,"SpentFuelStorageRackNeutronAbsorber MonitoringProgram"

  • OnNovember7,2014,heldadropinmeetingwith:

- RodMcCullumandKrisCummings(NEI)

- BrianMann(TSTF)

- TimMcGinty(Director,DivisionofSafetySystems),Rob Tayler(DeputyDirector),ChrisJackson(Chief,Reactor SystemsBranch),andRobElliott(Chief,Technical SpecificationsBranch) 6

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF557,Rev.1,"SpentFuelStorageRackNeutronAbsorber MonitoringProgram"

  • Discussedanapproachtoresolvetheconcern:

- ExpediteNRCreviewandapprovalofproposedindustry monitoringprogram

- CreateatravelerthataddsanAdministrativeControls programthatreferencestheNRCapprovedprogram

- Intheinterim,TSTFtocreateaTtravelertoprovide guidancetolicenseessubmittingLARstorevisespentfuel poolcriticalityanalysis

  • TSTF557T,Rev.0 7

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF557,Rev.1,"SpentFuelStorageRackNeutronAbsorber MonitoringProgram"

  • Discussedanapproachtoresolvetheconcern:

- NRChadbeenreviewingNEI1216,Guidancefor PerformingCriticalityAnalysesofFuelStorageatLight WaterReactorPowerPlants,whichincludesasectionon monitoring

- OnTSTFrecommendation,NEIextractedthemonitoring descriptionintoNEI1603,"GuidanceforMonitoringof FixedNeutronAbsorbersinSpentFuelPools"

  • ApprovedbytheNRCinMarch2017.

- ThetravelerwouldaddanAdministrativeControlsneutron absorbermonitoringprogramthatimplementsNEI1603.

8

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF557,Rev.1,"SpentFuelStorageRackNeutronAbsorber MonitoringProgram"

  • ProposedAdministrativeControlProgram:

5.5.XX SpentFuelStorageRackNeutronAbsorberMonitoring Program ThisProgramprovidescontrolsformonitoringthe conditionoftheneutronabsorberusedinthespent fuelpoolstoragerackstoverifytheneutronabsorber densityisconsistentwiththeassumptionsinthespent fuelpoolcriticalityanalysis.Theprogramshallbein accordancewithNEI1603A,"GuidanceforMonitoring ofFixedNeutronAbsorbersinSpentFuelPools,"

Revision0,May2017[,withthefollowingexceptions:

1.].

9

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF557,Rev.1,"SpentFuelStorageRackNeutronAbsorber MonitoringProgram"

  • Nomodelapplication.

- ProgramwouldbeproposedaspartofaLARtorevisethe spentfuelpoolcriticalityanalysis

  • Bracketed.Onlyplantsthatcreditneutronabsorbingmaterials intheirSFPcriticalityanalysisrequireamonitoringprogram
  • Couldbevoluntary,plantspecificadoptionbyplantswith existingmonitoringprograms
  • Thetravelerreferences,butdoesnotrepeat,thetechnical justificationinNEI1603.

10

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF557,Rev.1,"SpentFuelStorageRackNeutronAbsorber MonitoringProgram" Discussion 11

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF566,Rev.0,ReviseActionsforInoperableRHR ShutdownCoolingSubsystems

  • ApplicabletoallBWRplants
  • RevisesMode3and4TSActionsforinoperableRHR ShutdownCooling(SDC)subsystems
  • Addressesseveralshortcomingintheexistingactionsthat havebeendiscussedwiththeTechSpecBranchandwasthe subjectofinspectionactions 12

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF566,Rev.0,ReviseActionsforInoperableRHR ShutdownCoolingSubsystems

  • Issue1

- IfarequiredRHRSDCsubsystemisinoperableinMode3,4 or5,theActionsrequireanalternatemethodofdecay heatremovaltobeavailableforeach inoperableRHR shutdowncoolingsubsystem

- TheTSBasesstatethattherequiredcoolingcapacityofthe alternatemethodshouldbecapableofmaintainingor reducingtemperature

- Inperiodsofhighdecayheatload,theBWRdesigndoes notincludeanyalternatesthatwouldsatisfytheRequired Action

  • BasisofURIsforPerry(nowclosed)andMonticello 13

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF566,Rev.0,ReviseActionsforInoperableRHR ShutdownCoolingSubsystems

  • Issue2

- InMode3or4,ifthereisnoalternatemethodofdecay heatremovalforeachinoperableRHRSDCsubsystem, thereisnoTSActiontofollow.

- Thelackofaterminalactionhasraisedquestionsfromthe NRC

  • AlsobasisofURIsforPerry(nowclosed)andMonticello 14

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF566,Rev.0,ReviseActionsforInoperableRHR ShutdownCoolingSubsystems

  • Issue3

- IfoneormoreRHRshutdowncoolingsubsystemsare inoperableinMode3,theplantmustbeinMode4in24 hours.

- WithnooperableRHRSDCsubsystem,itmaynotbe possibletoreducetheRCStemperaturetoMode4 (typically<200°F)within24hoursinperiodofhighdecay heatload 15

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF566,Rev.0,ReviseActionsforInoperableRHR ShutdownCoolingSubsystems

  • Issue4

- TherearecircumstancesinwhichRHRSDCisinoperable (suchaslossofseismicqualificationornonfunctional supportsystems),butstillmeetstheBasesdescriptionof analternatedecayheatremovalmethod(capableof maintainingorreducingtemperature)

- TheuseofaninoperablebutfunctionalRHRSDC subsystemasanalternatewasthesubjectofaviolation.

16

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF566,Rev.0,ReviseActionsforInoperableRHR ShutdownCoolingSubsystems

  • BecauseoftheredundancyandreliabilityoftheRHRSDC system,theseissueshaverarelypresentedaproblem
  • However,becauseoftheNRCinspectionactions,theTSTF agreedtoproposeatravelertoresolvethem 17

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF566,Rev.0,ReviseActionsforInoperableRHR ShutdownCoolingSubsystems

  • Changes

- RestructuredRHR/SDCActionsinModes3and4torequire establishmentofanalternatemethodwithin1hour, followedbyadefaultactiontoinitiateimmediateactionto restoreRHRSDCtooperablestatus

  • ProvidesterminalactionconsistentwithPWRRHRTS

- EliminatedMode3requirementtogotoMode4

  • Mode4eliminatesapotentialheatremovalmechanism 18

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF566,Rev.0,ReviseActionsforInoperableRHR ShutdownCoolingSubsystems

  • Changes

- RevisedtheMode3,4,and5TSBasestostatean inoperablebutfunctionalRHRSDCsubsystemcanbean alternateifitcanmaintainorreduceRCStemperature:

  • RHRSDCisthedesignmethodtoremovedecayheatandisbacked byemergencypower
  • RHRSDChasfargreaterheatremovalcapacitythanother alternates(RWCU,SFPCleanup)

- OtherBaseschangesarediscussedinthetraveler 19

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF566,Rev.0,ReviseActionsforInoperableRHR ShutdownCoolingSubsystems Discussion 20

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF568,ClarifyApplicabilityofBWR/4TS3.6.2.5andTS 3.6.3.2

  • ApplicabletoBWR/2,BWR/3,BWR/4,andsomeearlyBWR/5 plants(NUREG1433)
  • ClarifiestheintentoftheexistingApplicabilityof:

- TS3.6.2.5,"DrywelltoSuppressionChamberDifferential Pressure,"

  • BrownsFerry,Dresden,Fitzpatrick,andQuadCities,

- TS3.6.3.2,"PrimaryContainmentOxygenConcentration

  • AllBWR/2,BWR/3,BWR/4,andBWR/5units 21

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF568,ClarifyApplicabilityofBWR/4TS3.6.2.5andTS 3.6.3.2

  • CurrentApplicability:

MODE1duringthetimeperiod:

a. From[24]hoursafterTHERMALPOWERis>[15]%RTP followingstartup,to
b. [24]hourspriortoreducingTHERMALPOWERto

<[15]%RTPpriortothenextscheduledreactor shutdown.

  • CurrentAction:

- ReduceTHERMALPOWERto[15]%RTP.

22

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF568,ClarifyApplicabilityofBWR/4TS3.6.2.5andTS 3.6.3.2

  • NRCinspectionissueraisedquestionofwhetherApplicability isMode1orMode1>[15]%RTP
  • BasedonTSTFresearch,determinedthecorrectapplicability isMode1>[15]%RTP 23

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF568,ClarifyApplicabilityofBWR/4TS3.6.2.5andTS 3.6.3.2

  • TSTFdeterminedthatallplantswithTS3.6.2.5,exceptBrowns Ferry,haveNRCapprovedanalysesthatsupportoperation below15%RTPwithoutmeetingthedifferentialpressurelimit isacceptable

- ProposedchangetoTS3.6.2.5isnotapplicabletoBrowns Ferry.

24

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF568,ClarifyApplicabilityofBWR/4TS3.6.2.5andTS 3.6.3.2

  • AllBWR/2,BWR/3,BWR/4,andBWR/5plantswithMarkIorII containmentshaveTS3.6.3.2primarycontainmentoxygen concentration.
  • TheexistingBasesforthePrimaryContainmentOxygen Concentrationstates,"Aslongasreactorpoweris<15%RTP, thepotentialforaneventthatgeneratessignificanthydrogen islowandtheprimarycontainmentneednotbeinert."

25

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF568,ClarifyApplicabilityofBWR/4TS3.6.2.5andTS 3.6.3.2

  • RevisedtheTS3.6.2.5andTS3.6.3.2Applicabilitytostate:

- Mode1withTHERMALPOWER>[15%]RTP

  • AddedthefollowingNotestoSR3.6.2.5.1and SR3.6.3.2.1:

- 1.Notrequiredtobemetuntil24hoursafterTHERMAL POWER>[15]%RTP.

- 2.Notrequiredtobemet24hourspriortoTHERMAL POWERbeingreduced[15]%RTP.

26

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF568,ClarifyApplicabilityofBWR/4TS3.6.2.5andTS 3.6.3.2

  • Eliminationoftheundefinedtermsstartupandnext scheduledreactorshutdownisjustifiedinthetraveler
  • Theproposedchangeclarifiestheintentoftheexisting requirementsandisconsistentwiththeplantdesignand safetyanalysis 27

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF568,ClarifyApplicabilityofBWR/4TS3.6.2.5andTS 3.6.3.2 Discussion 28

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF569,Rev.0,ReviseResponseTimeTestingDefinition

  • Overviewdiscussion.Separatepresubmittalmeeting requested.
  • TechnicalchangeapplicabletoWestinghouseandCombustion Engineeringplants
  • Revisesthedefinitionsof:

- EngineeredSafetyFeature(ESF)ResponseTime(WandCE)

- ReactorTripSystem(RTS)ResponseTime(W),

- ReactorProtectionSystem(RPS)ResponseTime(CE) 29

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF569,Rev.0,ReviseResponseTimeTestingDefinition

  • In19912001,EPRI,Westinghouse,andCombustion Engineeringrequestedandreceivedapprovaltouseallocated responsetimesforcertaincomponentsinlieuofmeasured responsetimes

- TheTopicalReportsevaluatedspecificcomponentsin specificinstrumentfunctions 30

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF569,Rev.0,ReviseResponseTimeTestingDefinition

  • Responsetimetestingisveryresourceintensiveandoften requiresspecializedcontractorservices,promptingthe industryeffortstouseallocatedresponsetimesforsome components
  • Manyoftheevaluatedcomponentsareobsoleteand replacementcomponentscannotbeobtained 31

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF569,Rev.0,ReviseResponseTimeTestingDefinition

  • ThePWROGconsideredsubmittinganewtopicalreport evaluatingnewcomponentsinamannersimilartothe obsoletecomponents,butthissimplydelayedtheissue,is veryexpensiveandtimeconsuming,andlimitstheuseofnew components
  • Instead,TSTF569requestsNRCapprovaltoallowlicenseesto applytheTopicalReportmethodtonewcomponents 32

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF569,Rev.0,ReviseResponseTimeTestingDefinition CurrentDefinitionandProposedChange:

- TheESFRESPONSETIMEshallbethattimeintervalfromwhen themonitoredparameterexceedsitsactuationsetpointatthe channelsensoruntiltheESFequipmentiscapableofperforming itssafetyfunction(i.e.,thevalvestraveltotheirrequired positions,pumpdischargepressuresreachtheirrequiredvalues, etc.).Timesshallincludedieselgeneratorstartingandsequence loadingdelays,whereapplicable.Theresponsetimemaybe measuredbymeansofanyseriesofsequential,overlapping,or totalstepssothattheentireresponsetimeismeasured.Inlieu ofmeasurement,responsetimemaybeverifiedforselected componentsprovidedthatthecomponentsandmethodology forverificationhashavehasbeenpreviouslyreviewedand approvedbytheNRC.

AsimilarchangeismadeforRPSandRTSResponseTime 33

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF569,Rev.0,ReviseResponseTimeTestingDefinition

  • Thetravelerjustifiesthattheearliermethodisappropriatefor alicenseetoapplytonewcomponents 34

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF569,Rev.0,ReviseResponseTimeTestingDefinition

  • Industryparticipantsinpresubmittalmeeting:

- TSTF

- PWROG

- Westinghouse

  • Discussion 35
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