ML17335A541
| ML17335A541 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 10/01/1999 |
| From: | POWERS R P INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML17335A542 | List: |
| References | |
| C1099-08, NUDOCS 9910060099 | |
| Download: ML17335A541 (40) | |
Text
carzaoarREGULATORYINFORMATIONDISTRIBUTION'SYSTEM(RIDS)UACCESSIONNBR:9910060099DOC.DATE:99/10/01NOTARIZED:YESFACIL:50-315DonaldC.CookNuclearPowerPlant,'nit1,IndianaM50-316DonaldC.CookNuclearPowerPlant,Unit2,IndianaMAUTH.NAMEAUTHORAFFILIATIONPOWERS,R.P.IndianaMichiganPowerCo.(formerlyIndianaSMichiganEleRECIP.NAMERECIPIENTAFFILIATIONRecordsManagementBranch(DocumentControlDesk)DOCKET¹0500031505000316NOTES:RCIPIENTIDCODE/NAMESTANG,JCOPIESLTTRENCL1111RECIPIENTIDCODE/NAMEBARNHILL,ESC
SUBJECT:
Appl'icationforamendstolicensesDPR-585:DPR-74,revising("containmentrecj.rculationsumpwaterinventory.CalculationEnon-proprietaryWCAP-15302reptalsoencl.ADISTRIBUTIONCODE:ROOIDCOPIESRECEIVED:LTRiENCLISIZE:Itl4TITLE:ORSubmittal:GeneralDistributionGCOPIESLTTRENCL011INTERNAFIECENTER01NRRDXBOGC/RPEXTERNAL:NOAC11111011NRR/DSSA/SPLBJDOCS-ABSTRACTNRCPDR111111D.U'ENNOTETOALL"RZDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE.'TOHAVEYOURNAMEORORGANIZATIONREMOVEDFROMDISTRIBUTIONLISTSORREDUCETHENUMBEROFCOPIESRECEIVEDBYYOUORYOURORGANIZATION,CONTACTTHEDOCUMENTCONTROLDESK(DCD)ONEXTENSION415-2083TOTALNUMBEROF.COPIESREQUIRED:LTTR10ENCL9
~Ml491071373ANMIClhM'LECI/CA7MfERC1099-0810CFR50.90DocketNos.:50-31550-316U.S.NuclearRegulatoryCommissionATTN:DocumentControlDeskMailStop0-P1-17'Washington,DC20555-0001October1,1999DonaldC.CookNuclearPlantUnits1and2TECHNICALSPECIFICATIONCHANGEREQUESTCONTAINMENTRECIRCULATIONSUMPWATER.INVFNTORYPursuantto10CFR50.90,IndianaMichiganPowerCompany(18cM),theLicenseeforDonaldC.CookNuclearPlant(CNP)Units1and2,proposestoamendAppendixA,TechnicalSpecifications(T/S),ofFacilityOperatingLicensesDPR-58andDPR-74.18'cMhasdeterminedthat,forcertainsmallbreakloss-of-coolantaccidentscenarios,theremaynotbesufficientcontainmentrecirculationsumpwaterinventorytosupportcontinuedoperationoftheemergencycorecoolingsystemandcontainmentspraysystempumpsduringandfollowingswitchovertocoldlegrecirculation.Resolutionofthisissueconsistsofacombinationofphysicalplantmodifications,newanalysesofcontainmentrecirculationsumpinventory,andresultantchangestotheaccidentanalysestoensuresufficientwaterinventoryinthecontainmentrecirculationsump.TheseplannedmodificationsandanalysesresultinthechangestotheT/Sproposedinthissubmittal.ThephysicalplantmodificationsandanalysesresultingintheproposedT/SchangesresolveConfirmatoryActionLetterNo.RIII-97-011,Item1,"RecirculationSumpInventory/ContainmentDeadEndedCompartments."ApublicmeetingwasheldonJuly12,1999,involvingI&MrepresentativesandNuclearRegulatoryCommission/NuclearReactorRegulationstaff.ThepurposeofthismeetingwasforI&MtopresenttheanalysesandproposedphysicalPDRADOCK050003AEP:America'sEnergyPartner" U.S.NuclearRegulatoryCommissionPage2C1099-08modificationstoresolvethecontainmentrecirculationsumpminimuminventoryissue.Followingthismeeting,IAMreceivedcommentsRomamemberofthepublicconcerningthetechnicalpresentation.ThesecommentsandtheassociatedIAMresponsesareprovidedinAttachment11.I&MrequestsapprovalofthisrequestbyDecember13,1999.Thisrequestisbasedonsupportingthedevelopmentandapprovalofapplicableemergencyoperatingprocedures,andallowingsufficienttimeforlicensedoperatortrainingontheapprovedchangespriortoentryofUnit2intoMode4.CopiesofthisletteranditsattachmentsarebeingtransmittedtotheMichiganPublicServiceCommissionandMichiganDepartmentofPublicHealth,inaccordancewiththerequirementsof10CFR50.91.Shouldyouhaveanyquestions,pleasecontactMr.RobertC.Godley,DirectorofRegulatoryAffairs,at(616)466-2698.Sincerely,R.P.PowersVicePresident,1999SWORNTOANDSUBSCRIBEDBEFOREMETIS-DAYMyCommissionExpires)~CQKMIKhgewA.C.Bakken,III,w/attachmentsJ.E.Dyer,w/attachmentsMDEQ-DWScRPDNRCResidentInspector,w/attachmentsR.Whale
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U.S.NuclearRegulatoryCommissionPage3C1099-08Attachments1.DescriptionandSafetyAnalysisfortheProposedChanges2A.TechnicalSpecificationsPagesMarkedtoShowProposedChanges-RevisedPages-Unit12B.TechnicalSpecificationsPagesMarkedtoShowProposedChanges-RevisedPages-Unit23A.ProposedTechnicalSpecificationsPages-RevisedPages-Unit13B.ProposedTechnicalSpecificationsPages-RevisedPages-Unit24.NoSignificantHazardsConsiderationEvaluation5.EnvironmentalAssessment6.DescriptionandResolutionofContainmentRecirculationSumpWaterInventoryIssue7.FauskeIAssociates,Incorporated-FAU99-77,"ContainmentSumpLevelEvaluationfortheD.C.CookPlant"8.MPRAssociates,Incorporated-"ContainmentSumpLevelDesignConditionA,FailureEffectsAnalysisforPotentialDraindownScenarios"9.MPRAssociates,Incorporated-"EvaluationofCookRecirculationSumpLevelforReducedPumpFlowRates"10.WCAP-15302,"DonaldC.CookNuclearPlantUnits1and2ModificationstotheContainmentSystemsWestinghouseSafetyEvaluation(SECL99-076,Revision3)"11.ResponsetoJuly12,1999,PublicMeetingTechnicalComments12.Commitments
~)~g4 ATTACHMENT11TOC1099-08RESPONSETOJULY12,1999,PUBLICMEETINGTECHNICALCOMMENTSApublicmeetingwasheldonJuly12,1999,involvingIndianaMichiganPowerCompany(IEcM)representativesandNuclearRegulatory.Commission/NuclearReactorRegulationstaff.ThepurposeofthismeetingwasforI&Mtopresenttheanalysesandproposedphysicalmodificationstoresolvethecontainmentrecirculationsumpminimuminventoryissue.Followingthisineeting,I&Mreceivedseveralcommentsfromamemberofthepublicconcerningthetechnicalpresentation.Thesecomments,andtheassociatedIAMresponses,aredescribedbelow.1.Dotheemergencydieselgeneratorloadprofiles(voltagevs.time)indicatesufficientmargintoaccommodatetheairrecirculationfanloadsat144seconds?Yes.Startingthecontainmentairrecirculation/hydrogenskimmer(CEQ)fansat144secondswillhavenoeffectonthetransientstudyfortheemergencydieselgenerators.ThesequencingofloadsiscompletedwellbeforetheCEQfansstart.Theemergencydieselgeneratorsteadystateloadingevaluatestotalloadthroughouttheemergencydieselloading,sequence.TheCEQfanstarttimechangewillnotresultinanewpeak.load.Therefore,theresultsofthesteadystatecalculationwillnotbeaffected.2.Cantheemergencydieselgeneratorfueloiltanksandtransfersystemaccommodatethehigheroutput(i.e.,greaterfuelconsumption)?Yes.Theemergencydieselgeneratorfueloilsystemisdesignedtosupportcontinuousfullloadoperation.Asnotedabove,thechangeinCEQfanstarttimewillnotchangethemaximumsteadystateoutput.Therefore,theemergencydieselgeneratorfueloiltanksandtransfersystemwillnotbeaffected.Thetotalfuelconsumedinthetransientwillchangeslightlyduetothepotentialforalongerfanruntime.Thiswillbeevaluatedaspartofthedesignchangeprocess,butwillbeinsignificantcomparedtothetotalavailablefueloilcapacity.3.IfECCSrecirculationswitchoveroccursat1900secondsinboththecurrentdesignandinthenewdesign,whyismoreRWSTinventoryrequired?(ItappearsthattheRWSTflowdurationintocontainment,andthereforetherequiredRWSTinventory,isthesameinbothcases).Theslidethatwasusedinthepresentationdetailingthesequenceofeventsfollowingadesignbasisaccidentwastohighlightthechangeineventprogressionasaresultofthe'arlieractuationoftheCEQfans,andmistakenlylistedthetimefortheinitiationofswitchoverto-coldlegrecirculationas1900secondsintotheevent.Therealimpactofthe Attachment11toC1099-08Page2refuelingwaterstoragetank(RWST)modifications(RWSToverflowlinemodificationandexistinginstrumentationrespan)isthat,allotherconditionsbeingequal,switchovertocoldlegrecirculationwilloccurlaterintheevent.4.Theoverallreductioninicemasscorrespondstoslightlyover16,000gallonsofwater.If.AEPelectednottoreducetheminimumicemassperbasket,wouldtheRWSTinventoryneedtobeincreasedby16,000gallons?The16,000gallonapproximatevaluesforboththeincreaseinRWSTcontainedinventoryandthereductioninicemassareonlycoincidentallythesame.TheplannedmodificationstotheRWSTresultin"new"waterinjectedintothecontainmentpriortoinitiationofemergencycorecoolingsystem(ECCS)recirculation.TheactualamountofadditionaldeliverableRWSTwaterisapproximately25,500gallons.Thisadditionalwaternotonlyincreaseswaterinventoryinthecontainmentrecirculationsump,butalsoincreasesthetimefortheonsetofcoldlegrecirculation.Thereductioniniceweightfortheicebasketsisunrelatedtotheshort-termportionofthecalculationsfordeterminingwaterinventoryinthecontainmentrecirculationsump.Themostimportantice-relatedparameterintheearlystagesofaneventistherateoficemelt,andthechangeinminimumiceweightdoesnotimpacttheicemeltrate.Theiceweightchangedoesreasonablyimpacttheultimateamountofwaterinthecontainmentrecirculationsumpunderlong-termsteady-.stateconditionsfollowingaloss-of-coolantaccident.However,atthatpointintimethereismorethanenoughwaterinthecontainmentrecirculationsumptosatisfytheminimumrequiredvortexinglevel.Thus,themagnitudeofthetwochangesisunrelated.
0AI
~'ATTACHMENT12TOC1099-08COMMITMENTSThefollowingtableidentifiesthoseactionscommittedtoby'IndianaMichiganPowerCompany(I&M)inthissubmittal.OtheractionsdiscussedinthesubmittalrepresentintendedorplannedactionsbyISLAM.TheyaredescribedtotheNuclearRegulatoryCommission(NRC)fortheNRC'sinformationandarenotregulatorycommitments.CommitmentAlltheidentifiedmodificationsinthissubmittalforaparticularunitwillbeinplacefortherestartofthatunit(eitherUnit1orUnit2).DatePriortoMode4entryfortheapplicableunitThesafetyevaluationsaddressingthestructuralandmechanicaleffectsoftheplannedmodificationswillbedocumentedintheDesignChangePackagesfortheindividualmodifications.ThefinalimpactoneachaffectedEmergencyOperatingProcedure(EOP)willbeaddressedaspartofacomprehensiveEOPreview,revision,andvalidationprogram.PriortoMode4entryfortheapplicableunit4PriortoMode4entryfortheapplicableunitNetpositivesuctionhead(NPSH)calculationsforthedifferentoperatingconfigurationsoftheemergencycorecoolingsystem(ECCS)pumpsandcontainmentspraysystem(CTS)pumpshavebeencompleted.TheresultsofthesecalculationswillbeprovidedinaseparatesubmittaladdressingGenericLetter(GL)97-04,"AssuranceofSufficientNetPositiveSuctionHeadforEmergencyCoreCoolingandContainmentHeatRemovalPumps."PriortoMode4entryfortheapplicableunit E~~
50-315D.C.COOK1IMPCOATTACHHENT1TOC1099-08DESCRIPTIONANDSAFETYANALYSISFORTHEPROPOSEDCHANGESRECORDM/LTRDTD10/1/999910060099-NOTICE-THEATTACHEDFILESAREOFFICALRECORDSOFTHEOCIO/INFORMATIONMANAGEMENTDIVISION.THEYHAVEBEENCHARGEDTOYOUFORALIMITEDTIMEPERIODANDMUST.BERETURNEDTOTHERECORDSANDARCHIVESSERVICESSECTION,T-5C3.PLEASEDONOTSENDDOCUMENTSCHARGEDOUTTHROUGHTHEMAIL.RFMOVALOFANYPAGE(S)FROMDOCUMENTSFORREPRODUCTIONMUSTBE.REFERREDTOFILEPERSONNEL.lO<
A~~q ATTACHMENT1TOC1099-08DESCRIPTIONANDSAFETYANALYSISFORTHEPROPOSEDCHANGES.A.SummaryofProposedChangesIndianaMichiganPowerCompany(IEcM),theLicenseeforDonaldC.CookNjclpar'Plant.(CNP)Units1and2,proposestoamendAppendixA,TechnicalSpecifications,(T/S);of:FaciiityOperatingLicensesDPR-58andDPR-74.i'I&;Mhasdeterminedthat,forcertainsmallbreakloss-of-coolantaccident(LOCA)scenarios,theremaynotbesufficientcontainmentrecirculationsumpwaterinventoryto.supportcontinuedoperationoftheemergencycorecoolingsystem(ECCS)andcontainmentspraysystem(CTS)pumpsduringandfollowingswitchovertocoldlegrecirculation.Thecauseofthisdeficiencyincludesdesignfeaturesoftheinternallowercontainmentcompartmentsthatcausesignificantamountsofwatertobedivertedfrom,andnottobemadeavailableto,thecontainmentrecirculationsump.Afurtherdescriptionofthetechnicalissuesinvolvedwiththisdeficiency,includingtheoriginaldesignbasisofthecontainmentrecirculationsumpandthecircumstancesleadingtothediscoveryandresolutionoftheseissues,isprovidedinAttachment6.ISLAMhasdeterminedthatacombinationofphysicalplantmodifications,newanalyses.ofcontainmentrecirculationsumpinventory,andresultantchangestotheaccidentanalysesarenecessarytoensuresufficientwaterinventoryinthecontainmentrecirculationsump.Theplannedmodificationsresultinincreasingtheamountofwaterdeliveredtothereactorcoolantsystem(RCS)andcontainmentfollowingaLOCA,andincreasingtheamountoficemeltfromtheicecondenserduringtheearlystagesofaLOCA.Newcontainmentrecirculation'umpinventoryanalyseshavebeenperformedthatreflecttheplannedmodificationsandverifysufficientinventoryisavailableinthecontainmentrecirculationsumpfollowingaLOCA.Finally,theaccidentanalyseshavebeenevaluated,andrevisedasnecessary,toreflecttheplannedmodificationsandproposedT/S.TheseplannedmodificationsandanalysesresultinthefollowingproposedchangestotheT/S:~Therequiredrefuelingwaterstoragetank(RWST)containedinventoryisbeingincreasedtoaddressthenewminimumdeliverableboratedwatervolumeusedinthecontainmentrecirculationsumpwaterinventoryanalysesandaccidentanalyses.Inaddition,aconservativemaximumRWSTsolutiontemperatureisbeingaddedtotheexistingT/Stoensurethevalueusedintheaccidentanalysesremainsbounding.~Theengineeredsafetyfeaturesactuationsystem(ESFAS)initiatingsignalandtimedelaytostartthecontainmentairrecirculation/hydrogenskimmer(CEQ)fansandopenassociatedvalvesarebeingrevisedtomaximizetheresultanticecondenserice.meltratefollowingaLOCA.ThisensuressufficientcontainmentrecirculationsumpwaterinventoryfollowingasmallbreakLOCA.
".;.f4l'i"sh'*~)c'>.fAf%tc>e~r,+JiV>cI'Ll~13~t~'4C""Q'.>f.,>~9ilki.i~<39/I"rplV'-~'ff'>t'<<'1'~,~3LJ'Qli<"A[~i'lli("sDs.fl'L'>I'.f"'f~p Attachment1toC1099-08.Page2~Theminimumrequirediceweightintheicecondenserisbeingrevisedtoreflecttheamountoficeusedinthecontainmentrecirculationsumpwaterinventoryanalysesandaccidentanalyses.TheassociatedT/SBaseswillberevisedtostatethattheminimumiceweightisrequiredasanas-foundconditionwithanappropriatemargintoaccountforuncertaintiesinweighingoftheicebaskets.PreviousprovisionsintheT/SBaseswillalsobedeletedthatdescribedreducingtheminimumrequirediceweightornumberoficebasketstobeweighedbasedonoperatingexperiencedata.TheproposedT/SchangesandassociatedT/SBaseschangesprovidedtoassistinthereviewoftheT/SchangesaredescribedindetailinSectionsB,C,andDofthisattachment.T/SpagesandassociatedT/SBasespagesthataremarkedtoshowtheproposedchangesareprovidedinAttachments2Aand2BforUnit1andUnit2,respectively.Notethatthesechangesmayreflectformattingthatdiffersslightlyfromthecurrentpages.Theseformatchangesareintendedtoimproveappearanceandarenotintendedtointroduceotherchanges.TheproposedT/SpagesandassociatedT/SBasespages,withthechangesincorporated,areprovidedinAttachments3Aand3BforUnit1andUnit2,respectively.IB.ProposedT/SChangeforRWSTContainedInventoryandSolutionTemperatureecurree'eT/S3/4.1.2.8,"BoratedWaterSources-Operating,"andT/S3/4.5.5,"RefuelingWaterStorage.Tank,"requireaminimumcontainedvolumefortheRWSTof350,000gallonsofwater.TheRWSTwaterisrequiredtocontainbetween2400and2600ppmboronataminimumsolutiontemperatureof70'F.Thereis'noexistingrequirementforRWSTmaximumsolutiontemperature.BothT/SareapplicableinModes1through4.urrRe'tTheminimumRWSTcontainedinventoryisbaseduponensuringthatsufficientnegativereactivityisinjectedintothereactorcoretocounteractanypositiveincreaseinreactivitycausedbyRCScooldown,TheminimumRWSTcontainedinventoryensuresthatasufficientsupplyofboratedwaterisavailableforinjectionbytheECCSpumpsandcontainmentspraybytheCTSpumpsfollowingaLOCAoramainsteamlinebreak(MSLB).ThelimitsonRWSTminimumvolumeensurethat,whencombinedwithwaterfrommelted'ice,theRCS,andthesafetyinjectionaccumulators,sufficientwaterisavailablewithin'containment.topermitrecirculationcoolingflowtothereactorcore.Inaddition,thelimitsonboronconcentrationensurethatthereactorwillremainsubcriticalfollowingaLOCAassumingmixingoftheRWST, t~~
Attachment1toC1099-08..Page3RCS,ECCSwater,andothersourcesofwaterthatmayeventuallyresideinthecontainmentrecirculationsump.ThelimitsonRWSTminimumvolumeandboronconcentrationalsoensurealong-termpHvalueforthesolutionrecirculatedwithincontainmentafteraLOCAthatminimizestheevolutionofiodine.Inaddition,theeffectofchlorideandcausticstresscorrosiononmechanicalsystemsandcomponentsisminimizedwhenthelong-termpHvaluesarecontrolledfollowingaLOCA.4TheECCSanalysestodetermineF<limitsinT/S3/4.2.2,"HeatFluxHotChannelFactor-F<(Z),"andT/S3/4.2.6,"AllowablePowerLevel-APL,"assumeanRWSTwatertemperatureof70'F.TheRWSTwatertemperaturedeterminesthetemperatureofthecontainmentspraywaterinitiallydeliveredtothecontainmentfollowingaLOCAorMSLBinsidecontainment.TheminimumassumedRWSTwatertemperatureisoneofthefactorswhichdeterminesthecontainmentback-pressureintheECCSanalysesperformedinaccordancewiththeprovisionsof10CFR50.46and10CFR50,AppendixK.evieeuirePhysicalmodificationstotheRWSToverflowlineandarespanoftheRWSTlevelinstrumentationarebeingimplementedtoallowincreasingtheavailabledeliverablevolumefromtheRWST.ThisadditionalavailablewaterisnecessarytoensuresufficientcontainmentrecirculationsumpwaterinventorytopreventvortexingandpossiblefailureoftheECCSpumpsandCTSpumps.TheproposedT/SchangeinminimumRWSTcontainedinventoryisneededtobeconsistentwiththetotalminimumdeliverableRWSTvolumeassumedinthecontainmentrecirculationsumpinventoryanalysesandrevisedaccidentanalyses.TheexistingT/SonlyspecifiesaminimumRWSTsolutiontemperature.However,therecentlyconductedExpandedSystemReadinessReviewsidentifiedtheneedtoalsoincludethemaximumRWSTsolutiontemperatureintheT/S.ThischangeisneededtoensurethatactualRWSTtemperatureismaintainedlessthanthemaximumassumedtemperatureintheexistingaccidentanalyses.ThisproposedchangeisalsonecessarytobeconsistentwiththeT/SinNUREG-0452,"WestinghouseStandardTechnicalSpecifications,"andNUREG-1431,Revision1,"StandardTechnicalSpecifications-WestinghousePlants."4riinfteedaeIAMproposestoreviseT/S3/4.1.2.8andT/S3/4.5.5toincreasetheminimumRWSTcontainedinventoryto375,500gallons,andtospecifythemaximumallowedRWSTsolutiontemperatureof100'F.
0 Attachment1toC1099-08.Page4BaeePredaeTheproposedT/SchangeintheminimumRWSTcontainedinventoryreflectsplannedmodificationstotheRWSToverflowlineandanincreaseinspanoftheRWSTlevelinstrumentationtoprovideforadditionalavailablewaterfromtheRWST.ThemodificationtotheRWSToverflowlineallowstheproposedincreaseintheT/SminimumRWSTcontainedinventoryof25,500gallons.'iththismodification,theexistingoperatingmarginbetweentheT/SminimumRWSTcontainedinventorylevelandactualoverflowofwaterfromthetankismaintained.StructuralevaluationsoftheRWSTconfirmthatthereisnoimpacttotheseismiccapabilityoftheRWSTatthenew,higheroverflowwaterlevel.Inaddition,theindicatedRWSTwaterlevels(indicatedas0-100%ofspan)atthetimetheoperatorisinstructedtobeginandcompletetheswitchovertocoldlegrecirculationwillnotchange.AmaximumRWSTwatertemperatureof105'FisusedintheECCSanalysesperformedinaccordancewiththeprovisionsof10CFR50.46and10CFR50,AppendixK.AmaximumRWSTwatertemperatureof105'Fisalsousedinthecontainmentintegrityanalysesperformedtodeterminetime-dependentcontainmentpressuresandtemperaturesfollowingaLOCAorMSLBinsidecontainment.AdditionofthemaximumRWSTsolutiontemperaturetotheT/Susing100'Ftoconservativelyboundtheanalyticallimitof105'F,ensuresthatthecontainmentintegrityandLOCAanalysesremainbounding.ThischangeisalsoconsistentwithNUREG-0452andNUTMEG-1431,Revision1.C.ProposedT/SChangeforManualandAutomaticActuationLogicandTimeDelayforCEQFansandValvesciheenteueeESFASrequirementsarelistedinT/STable3.3-3,"EngineeredSafetyFeatureActuationSystemInstrumentation,"-T/STable3.3-4,"EngineeredSafetyFeatureActuationSystemInstrumentationTripSetpoints,"andT/STable4.3-2,"EngineeredSafetyFeatureActuationSystemInstrumentationSurveillanceRequirements."TheT/StablesspecifythatmanualactuationoftheCEQfansisaccomplishedaspartofthecontainmentspraymanualactuationrequirements.ThesemanualactuationrequirementsareapplicableinModes1through4.AutomaticactuationoftheCEQfansandvalvesisnotspecificallydetailedintheT/Stables.However,theexistingdesignincludesactuationoftheCEQfansandhydrogenskimmervalvesatatimedelayof9+1minutesaflerreceiptofacontainmentsprayautomaticactuationsignal(containmentpressure-high-high)inModes1through3.Thecomponentcoolingwater(CCW)
Attachment1toC1099-08Page5supplyandreturnvalvestotheCEQfanmotorsopenwithouttimedelayaAerreceiptofacontainmentsprayautomaticactuationsignal(containmentpressure-high-high).ThecontainmentsprayautomaticactuationlogicisrequiredtobeoperableinModes1through3.T/S3/4.6.5.6,"ContainmentAirRecirculationSystems,"specifiessurveillancerequirementstoverifythedelayof9+1minutesaAerreceiptoftheautomaticsignalforstartingoftheCEQfansandopeningthehydrogenskimmer.valves.eteeireetThedesignoftheCEQsystemensuresthatfollowingaLOCAthecontainmentatmosphereiscirculatedforcoolingbythecontainmentspraysandtheaccumulationofhydrogeninlocalizedportionsofthecontainmentstructureisminimized.TheautomaticactuationsignalandtimedelayfortheCEQfansandvalvesaffectsthecontainmentback-pressureusedintheECCSanalysesperformedinaccordancewiththeprovisionsof10CFR50.46and10CFR50,Appendix.K.IntheECCSanalysesperformedduringtheoriginallicensingofbothCNPunits(circa1970),thecomputermodelsusedwereoverlysensitivetocontainmentback-pressurefollowingaLOCAascomparedtothecurrentECCSanalysesofrecord.ThiswasespeciallytrueduringtheperiodafterinitialblowdownoftheRCSuntilthereactorvesselisrefloodedbytheinitialinjectionofthesafetyinjectionaccumulatorsandflowfromtheECCSpumps.BecauseofthelimitationsofthecalculationalmethodologyusedintheoriginalECCSanalyses,theactuationsignalandminimumtimedelayfortheCEQfansandvalveswereestablishedto~maximizecontainmentback-pressurefollowingaLOCA.Maximizingcontainmentback-pressureprovidedabenefitintheoriginalECCSanalysesbylimitingbreakflow&omtheRCS,therebyreducingthetimeforreactorvesselreflood.TheexistingtimedelayfortheCEQfansandvalvesalsoensuredadequatecoolingofthecontainmentatmospherebytheCTSandpreventedlocalized-accumulationofhydrogeninthelowercontainmentcompartments.eRvitee'etsTheproposedT/SchangesfortheESFASinitiatingsignalandtimedelaytostarttheCEQfansandopenassociatedvalvesreflectmodificationsbeingperformedtoensureearlierfo'reedflowofsteamandairthroughtheicecondenser.ThismodificationhastheeffectofincreasingtheicemeltrateintheearlierstagesofaLOCA.Creditforincreasedicemeltensuresthat,forthelimitingsizeLOCAandLOCAbreaklocations,sufficientwaterinventorywillbepresentinthecontainmentrecirculationsumpduringRCScoldlegrecirculation.Thecontainmentrecirculationsumpinventoryanalysesandaccidentanalysesdescribedinthissubmittalreflecttheseplannedmodifications.
,Attachment1toC1099-08Page6Theplannedmodifications.resultinremovingautomaticactuationoftheCEQfansandvalvesfromtheexistingcontainmentsprayESFASautomaticactuationlogicandmanualactuationfromtheexistingcontainmentspraymanualactuationpushbuttons.AAerthemodification,theCEQfansandvalveswillbeautomaticallyactuatedfromacontainmentpressure-highinitiationsignalfromtheESFASautomaticactuationlogic.TheCEQfansandvalveswillbemanuallyactuatedbyusingthenormalhandswitcheslocatedinthecontrolroominsteadofamanualpushbuttonthatactuatestheESFASautomaticactuationlogic.ManualactuationoftheCEQfansandvalvesisonlyrequiredintheeventtheESFASautomaticactuationfails,orinMode4whentheESFASautomaticactuationlogicisnotrequired.ThisresultsintheneedtorevisetheESFAST/StablesandCEQfanandvalveT/Ssurveillancerequirementstoreflectthenewdesign.thIAMproposestoreviseT/STable3.3-3,T/STable3.3-4,T/STable4.3-2,andT/S3/4.6.5.6toreflectplannedmodificationstotheESFASactuationlogicandtothetimedelayrelayforstartingoftheCEQfansandopeningoftheCCWsupply,return,andhydrogenskimmervalvestotheCEQfans.ThisdesignchangewillmodifytheCEQfansstartinglogictoallowthefanstostartaflera120+12secondstimedelayafterreceiptofacontainmentpressure-high(1.1psig)ESFASsignal.Thedesignchangealsoconsidersinstrumentuncertaintiesfortheactuationpressuresetpoint.TheexistingdesignhasthefansstartaAeratimedelayof921minutesaAerreceiptofacontainmentpressure-high-high(2.9psig)signal.EarlieractuationoftheCEQfansinresponsetocontainmentpressure-highisreflectedinthenewanalysesofwaterinventoryinthecontainmentrecirculationsumpandtheassociatedanalysesdescribedinSectionEbelow.TheproposedchangestoT/STable3.3-3,T/STable3.3-4,andT/STable4.3-2includespecifyingmanualactuationrequirementsfortheCEQfansandvalvesseparatelyfromtheexistingcontainmentspraymanualactuationrequirements.Inaddition,thenewcontainmentpressure-highautomaticactuationlogicrequirementsfortheCEQfansandvalvesareproposedtobeaddedtotheappropriatelimitingconditionsforoperationrequirements,tripsetpoints,andsurveillancerequirementsintheT/Stables.TheproposedchangestoT/S3/4.6.5.6reflecttheplannedmodificationstothetimedelayforstartingoftheCEQfansandactuationoftheCEQvalves.TheexistingT/SSurveillanceRequirement4.6.5.6.dfortheCEQvalvesisproposedtobedeleted.AnewT/SSurveillanceRequirement4.6.5.6.disproposedtoaddverificationthattheCEQfanswillstartfromtheirrespectivehandswitchesinthecontrolroom,andtheCEQvalveswillopen,every3monthsonastaggeredtestbasis.TherequirementtoverifythattheCEQvalveopenswhentheCEQfanisstartedisproposedtobeaddedtotheexistingT/SSurveillanceRequirement4.6.5.6.a.In Attachment1toC1099-08Page7addition,itisproposedthatT/SSurveillanceRequirement4;6.5.6.abespecifiedasapplicableinModes1,2,and3only.BaeeProedaeTheproposedT/SchangesspecifyingtheactuationoftheCEQfansandvalvesonacontainmentpressure-highsignal,withatime.delayof120+12seconds,reflectplannedmodificationstoincreasetheamountofairandsteamflowthroughtheicecondenserduringtheearlystagesofasmallbreakLOCA.Theearlierinducedflowthroughtheicecondenserhastwonoticeableeffects.First,theenergyofthesteamreleasedduringthesmallbreakLOCAinthelowercontainmentcompartmentispreferentiallyabsorbedbytheicebedratherthaninpassivestructures.Preferentialabsorptionofheatbytheicebedresultsinincreasedicemelt,lowertemperaturesinthelowercontainmentcompartment,andincreasedcontainmentrecirculationsumpinventory.Second,thisabsorptionofenergyreleasedearlierinasmallbreakLOCAwilldelayreachingthecontainmentpressure-,high-highactuationsetpoint,whichinturnwoulddelaytheinitiationofcontainmentsprays.ForalargebreakLOCA,thetimeofCTSinitiationisnotdelayedbecauseoftheresultantrapidcontainmentpressurerise.DelayingCTSinitiationalsoincreasesicemeltsincethecontainmentsprayswouldcompetewiththeicecondenserforheatremoval.Anotherbenefitoftheplannedmodificationsisthatshort-termaccumulationofhydrogeninthelowercontainmentcompartmentsisminimizedforbothlargebreakandsmallbreakLOCAscenarios.ThecomputermodelsusedinthecurrentECCSanalysesofrecordarenotassensitivetocontainmentback-pressurefollowingaLOCAascomparedto'theoriginalECCSanalyses.TherevisedaccidentanalysesdescribedinAttachment10consideredtheimpactoftheplannedmodificationtotheactuationsignalandminimumtimedelayfortheCEQfansandvalves.Theseanalysesdemonstratethattheplannedmodificationsareacceptable.Theproposedchangesto.T/STable3.3-3,T/STable3.3-4,andT/STable4.3-2areconsistentwithotherexistingESFASrequirements.Theproposedlimitingconditionsforoperationinthetablesareidentica)totheexistingrequirementsforcontainmentpressure-highautomaticactuationlogicandCEQfanandvalvemanualactuationrequirements.Thisincludestotalnumberofchannels,channelstotrip,minimumnumberofchannelsrequired,modeapplicability,andactionstatementrequirementsidenticaltoexistingrequirementsformanualactuationandcontainmentpressure-highautomaticactuationlogic.ThenewmanualactuationfunctionalunitisrequiredtoaddressthefactthatthenewdesignwillrequireuseofthecontrolroomhandswitchestomanuallyactuatetheCEQfansandvalves.Consistentwithexistingrequirements,thecapabilitytomanuallyactuatetheCEQfansandvalveswillberequire'dinModes1through4.Thenewfunctionalunit'fortheCEQfansisrequiredtoaddressthenew,separateESFASautomaticactuationlogicfortheCEQfansandvalves.Alsoconsistentwithexistingrequirements,theautomaticactuationlogicwillberequired
Attachment1toC1099-08Page8tobeoperableinModes1through3.Inaddition,thecontainmentpressure-highsetpointisnotchangedbythissubmittal,andthe'roposedsurveillancerequirementsareidenticaltootherexistingrequirementsformanualactuationandcontainmentpressure-highautomaticactuationlogic.TheproposedchangetoT/S3/4.6.5.6reflectsthetimedelayusedintheanalysesofwaterinventoryinthecontainmentrecirculationsumpandtheassociatedanalysesdescribedinSectionEbelow.ThenewsurveillancerequirementforverifyingmanualstartoftheCEQfansfromthecontrolroomandverificationthattheCEQvalvesopenwhentheCEQfansstart,isconsistentwiththenewdesignoftheCEQfanandvalveactuationlogic.ThisisbecausemanualactuationoftheCEQfansandvalveswillbethroughuseofthenormalhandswitchesinthecontrolroominsteadofapushbuttonthatinitiatestheESFASautomaticactuationlogic(liketheexistingcontainmentsprayautomaticactuationdesign).AddingtherequirementtoverifythattheCEQvalvesopenwhentherespectiveCEQfanstartsisconsistentwiththeexistingandnewdesignoftheCEQfanandvalvelogic.EachCEQfanhas'asingletimedelayrelaythatwillbesetat120+12seconds.TheCEQvalvesareinterlockedwiththerespectiveCEQfantoopenimmediatelywhentheCEQfanstarts.Therefore,theexistingT/SSurveillanceRequirements4.6.5.6.aand4.6.5.6.darebothdescribingthesametimedelayrelayandareredundant.SpecifyingT/SSurveillanceRequirement4.6.5.6.aasapplicableonlyforModes1through3reflectsthattheplannedmodificationdoesnotincludeamanualactuationpushbuttonusingESFASautomaticactuationlogic.ConsistentwiththeESFAST/Stablechanges,theT/SsurveillancerequirementsthataddressoperabilityoftheautomaticactuationlogicareonlyrequiredinModes1through3.TheotherT/Ssurveillancerequirementsarenecessaryforverifyingbothautomaticactuationandmanualactuationfunctions.Therefore,itisappropriatetorequiretheotherT/SsurveillancerequirementsinModes1through4.D.ProposedT/SChangeforMinimumRequiredIceWeightintheIceCondenserc't'eeementT/S3/4.6.5.1,"IceBed,"specifiesaminimumrequirediceweightpericebasketof1333pounds,oratotalof2,590,000pounds.T/SBases3/4.6.5.1specifiesa5%allowanceforicelossthroughsublimationoveraneighteen-monthperiodasthebasisfortheminimumrequirediceweight.T/S3/4.6.5.1SurveillanceRequirementsstate,inpart,thatoperabilityoftheicecondensershallbeverifiedatleastonceper18monthsbyweighingarepresentativesampleoficebaskets.Toaccountforuncertaintiesassociatedwithicebasketweighingandsublimationoficeoveran
Attachment1toC1099-08Page9eighteen-monthperiod,eachicebasketisverifiedtocontainatleast1333poundsofice.Thisisanas-leftvalueforiceweightthatincludesameasurementuncertainty(1%),andallowanceforicesublimation(5%),appliedtotheminimumiceweightusedintheaccidentanalyses.T/SBases3/4.6.5.1includesallowanceforadjustingiceweightsorthenumberoficebasketstobeweighedduringsurveillancetestingbasedonaccumulateddataovermultipleoperatingcycles.aeheenReienTherequirementsassociatedwiththeicecondenserensurethatsufficientpressuresuppressioncapabilityisprovidedtolimitthecontainmentpeakpressuretransienttolessthanorequalto12psigduringLOCAandMSLBconditions.TheicebedT/Sensuresthattheminimumrequirediceweightisproperlydistributedthroughthecontainmentbays.Inaddition,sufficientheatremovalcapabilityisavailabletocondensethereactorsystemvolumereleasedduringaLOCA.TheseconditionsareconsistentwiththeassumptionsusedintheLOCAanalyses.ThelimitsonminimumrequirediceweightalsoensurethatwhencombinedwithwaterfromtheRWST,theRCS,andthesafetyinjectionaccumulators,sufficientwaterisavailablewithincontainmenttopermitrecirculationcoolingflowtothereactorcore.Theminimumweightrequirementof1333poundsoficeperbasketcontainsa5%allowanceforicelossthroughsublimationoveraneighteen-monthperiod.TheT/SBasesstatethat,iftheobservedsublimationisequaltoorlowerthandesignpredictionsafterthreeyearsofoperation,theminimumweightoftheicebasketsmaybeadjusteddownward.Inaddition,therequirednumberoficebasketstobeweighedeveryeighteenmonthsmaybereducedafterthreeyearsofoperationifsuchareductionissupportedbyobservedsublimationdata.Theseprovisionstoadjusttheiceweightornumberoficebasketstobeweighedreflectthattheoriginalrequirementswerebasedonpredictionsratherthanoperatingdata.eviReuieeThenewcontainmentrecirculationsumpwaterinventoryanalyseshaveusedalowerminimumweightof1132poundsoficeperbasket.Theminimumiceweightvaluechosenshouldminimizetherequiredamountoficeintheicecondensertofacilitateeffectivemanagementoficeinventoryfortheicecondenserandtofacilitateicecondensermaintenance.Inaddition,theproposediceweightmustbesufficienttomeettheacceptancecriteriafortherevisedaccidentanaly'sesdescribedinWCAP-15302,"DonaldC.CookNuclearPlantUnits1and2ModificationstotheContainmentSystemsWestinghouseSafetyEvaluation(SECL99-076,Revision3)"(Attachment10).TheproposedT/Sminimumiceweightsmeetthesecriteria.TheexistingT/Srequirementforminimumiceweightincludesallowanceforweightmeasurementuncertainty(1%)andforicesublimation(5%)overaneighteen-monthperiod.18cMprefersthattheminimumiceweightbespecifiedasanas-foundvaluewithonlytheweight
Attachment1toC1099-08.Page10measurement'uncertaintyincludedintheT/Sspecifiedminimumiceweight.ThisisnotconsistentwithNUREG-0452.However,itisconsistentwiththedefinitionin10CFR50.36foralimitingconditionforoperation.Inaddition,NUREG-1431,Revision1,doesnotspecifyanallowanceforicesublimation.Instead,licenseesarerequiredtocontrolconsiderationoficesublimationinowner-controlleddocumentssuchasapprovedprocedurestoensurethattheminimumiceweightatanygiventimeduringanoperatingcycleisatorabovetheanalyticalvalue.Therefore,specifyingtheminimumiceweightasanas-foundvalueisconsistentwiththisapproach.CompliancewiththeT/Shadpreviouslybeendemonstratedbyastatisticalanalysisofsampleicebasketweightswhichwereconsideredrepresentative.However,someicebasketscannotbephysicallyweighed,asacknowledgedbyboththe.T/SandtheCNPUpdatedFinalSafetyAnalysisReport(UFSAR).Visualsurveysoficebasketsindicatedthatsomeicebasketsinbothunits,predominantlyinradialrow9,butalsoradialrow8andazimuthalrow5,showedgreaterthanexpectedicelossduetosublimation.Sincethedatausedtosupporttheexistingiceweightlimitwasbasedonthesamesamplingmethod,itwasnecessarytoreevaluatethecalculationsperformedtodeterminetheweightlimitandtheassumptionsused.Basedonthisreevaluation,theproposedT/Sreflecttherestorationofthe10%allowanceforsublimationoveraneighteen-monthperiod.TheexistingT/SBasesincludesprovisionstoallowadjustingiceweightsornumberofbasketstobeweighedbasedonaccumulateddataovermultipleoperatingcycles.However,thevalueinT/ScannotbechangedwithoutNRCapproval.Therefore,theT/SBasesstatementisnotnecessarysinceitwouldresultinimplementinganunapprovedT/Schangeifitwerefollowed.ntheoeISLAMproposestoreviseT/S3/4.6.5.1,"IceBed,"toreflecttheminimumiceweightusedinthenewanalysesofcontainmentrecirculationsumpinventoryandassociatedanalysesdescribedin"SectionEbelow.Thenewminimumiceweightof1144poundspericebasket,or2,222,000poundstotal,includesa1%allowanceforuncertaintiesinvolvedinweighingoftheicebaskets.Therefore,theactualiceweightproposedintheT/Sisbasedonanas-foundweightoficecorrectedformeasurementuncertaintiestodetermineoperabilityoftheicecondenser.Inaddition,aneditorialchangetorevise"eachicebasket"to"icebaskets"isproposedtoclarifythattheas-foundweightappliestoalloftheicebasketsweighed.ConcurrentwithNRCapprovaloftheproposedT/Schanges,I&MwillreviseT/SBases3/4.6.5.1toincreasetheallowanceforicelossthroughsublimationfrom5%to10%overaneighteen-monthperiod.Thissublimationwillbeconsideredintheactualas-lefticeweighttobespecifiedintheproceduresgoverningweighingandfillingoftheicebaskets.Inaddition,theprovisiontoallowadjustingiceweightsornumberofbasketstobeweighedbasedonaccumulateddataovermultipleoperatingcycleswillbedeleted.
0 Attachment1toC1099-08Page11sefohereaeTheproposedT/SchangetotheminimumrequirediceweightintheicecondenserreflectsthevaluesusedinanalysesofminimumcontainmentrecirculationsumpinventoryandtheaccidentanalysesdescribedinSectionEbelow.Tobeconsideredoperable,theice.condenserisrequiredtobecapableofremovingenergybycondensingreleasedsteam,providingboratedwatertothecontainmentrecirculationsump,andmaintainingstructuralintegrity.Inaddition,thewaterfromthemeltedice,whencombinedwithothersourcesofwaterduringtheaccidentincludingtheRWST,theRCS,andsafetyinjectionaccumulators,mustnotresultincontainmentwaterlevelsabovethemaximumallowedflooduplevel,andmustensuresufficientboronconcentrationinthecontainmentrecirculationsump.Theanalyses,asfurtherdescribedinSectionEbelow,includeaninputassumptionofaminimumiceweightof2,200,000poundsofice(1132poundspericebasket).TheproposedminimumtotaliceweightrequirementforT/S4.6.5.1.b.2of2,222,000poundsisthecalculatedminimumweightof2,200,000pounds,plusa1%weightmeasurementuncertaintyallowance.TheproposedminimumweightrequirementforT/S3.6.5.1of1144poundspericebasketisthecalculatedminimumweightof1132poundspericebasket(2,200,000poundsdividedby1944icebaskets),plusa1%weightmeasurementallowance.Atthebeginningofafuelcycle,individualicebasketswillcontainsufficientadditionaliceovertherequiredminimumtoaccountforanaverageicebedsublimationof10%overaneighteen-monthperiod.Therefore,theminimumend-of-cycleiceweightwouldbegreaterthanorequaltotheamountneededtoperformtherequiredsafetyfunction.Statingtherequiredminimumiceweightonanas-foundbasisisachangefromtheexistingT/S.ThecurrentlyspecifiedT/Sminimumiceweightincludesa5%marginforsublimationoveraneighteen-monthperiod.Therefore,thecurrentlyspecifiedvalueis'nas-leftvalueatthebeginning-of-cycle.Specifyingtheas-leftvalueintheT/SisconsistentwiththeintentofNUREG-0452.However,itispreferablefortheT/Storepresentthevalueusedfordeterminingoperabilityoftheicecondenserregardlessofthepointintimetheiceisphysicallyweighed.Sublimationof10%overaneighteen-monthperiodwasinitiallyestablishedwithoutindustrydata.However,thesubsequentdatafromoperatingicecondenserplantshaveshownthatoverall.sublimationislessthan10%duringaneighteen-monthoperatingcycle.Therefore,theassumptionisconservativeandappropriate.NUREG-0452andtheCNPT/SBasesincludeaprovisiontoreducetheallowanceforicelossthroughsublimationifobservedsublimationisequaltoorlowerthandesignpredictionsaflerthreeyearsofoperation.ThisprovisionwasoriginallyincludedintheT/SBasestoallowicecondenserplantstodecreaseas-lefticebasketweightsandtoreducethenumberoficebasketsrequiredtobeweighedaflersufficientoperatingdatawasevaluated.ThisprovisionisnotrequiredbecauseanychangestotheactualT/Srequirementsmayonlybemadeinaccordance Attachment1toC1099-08Page12withanapprovedamendmenttotheoperatinglicense.ItshouldbenotedthatNUREG-1431,Revision1,doesnotincludeaspecificvalueforsublimationallowanceortheprovisiontoreducetheallowance.Theaccidentanalysesfurtherdescribedbelowdemonstratethattheproposedminimumrequirediceweightissufficienttoensurecontainmentintegrityismaintainedbylimitingthemaximumcontainmentpressureandtemperature.Inaddition,theanalysesdescribedinAttachment7alsodemonstratethatsufficienticeisavailabletomaintainaminimumwaterinventoryinthecontainmentrecirculationsumpabovetheminimumvortexinglevel.Thestructuralanalysisfortheicecondenserdemonstratesthatstructuralintegrityismaintaineduptoanaverageweightof1877poundsfortheicebasketswithineachlatticeframestructure(icebasketsplusice).Themaximumicebasketplusiceweightisadministrativelycontrolledtoensurethatthislimitisnotexceededforeachlatticeframestructurewithintheicecondenser.E.AcceptabilityandImpactoftheProposedT/SChangesAttachments7through10areanalysesperformedbyFauske&Associates,MPRAssociates,andWestinghouseElectricCompany.TheseanalyseswereperformedtodemonstratetheacceptabilityandimpactoftheproposedT/Schanges.I&Mhasreviewedandapprovedthese"analysesinaccordancewithapprovedadministrativeproceduresforowner-acceptanceofvendor-supplieddesignandanalysisinformation.irativet1eAttachment7describesthecontainmentrecirculationsumpwaterinventoryanalyses.TheanalysesdemonstratethattheincreasedRWSTcontainedinventory,theanalyzedamountoficemelt,andRCSandsafetyinjectionaccumulatorwaterinventoryreleasedtocontainment,issuflicienttoensurethattheminimumcontainmentrecirculationsumplevelrequiredtopreventvortexingismaintained.ThesecontainmentrecirculationsumpinventoryanalysesincludeconsiderationoflimitingsinglefailuresofECCSandCTScomponentsasdescribedinAttachment8.iAsdemonstratedbytheseanalyses,aminimumcontainmentrecirculationsumplevelgreaterthanorequalto602'-10"(theleveldemonstratedbytesttobeacceptable)wouldbeobtainedforMode1LOCAevents.However,certainMode3LOCAeventsresultinminimumcontainmentrecirculationsumplevelsslightlylessthan602'-10".ThisisbecauseofthelowermassandenergyreleasefromtheRCSexperiencedduringaMode3LOCAandtheresultantdecreaseintheicecondensericemeltrate.However,overallECCSandCTSflowrequiredformitigationofaMode3LOCAislessthanthemaximumflowsusedintheoriginalcontainmentrecirculationsumpdemonstrationtests.AsshowninAttachment9,theanalysesdemonstratethatminimumcontainmentrecirculationsumplevelsbelow602'-10"areacceptabletopreventvortexinginthecontainmentrecirculationsump,atflows-lessthanthemaximumflowsusedintheoriginal 0
Attachment1toC1099-08Page13containmentrecirculationsumpdemonstrationtests.ForMode3LOCAevents,theanalysesdemonstratethattheminimumcontainment.recirculationsumplevelslessthan602'-10"arestillsufficienttopreventvortexingatthereducedECCSandCTSflowratesexpected.ThereportpresentedinAttachment7inclitdes:~adescriptionoftheModularAccidentAnalysisProgram(MAAP)computercodemodelandversion(MAAP4.0.4.1)usedforperformingCNPcontainmentrecirculationsumpinventoryanalyses,~adescriptionofthedynamicbenchmarkingperformedfortheMAAP4.0.4.1modelagainstavailabledesignbasismodelsandicecondenserexperiments,~adescriptionofthemostlimitingconditionsusedinthecontainmentrecirculationsumpinventoryanalyses,~theanalyticalresultsforMode1LOCAeventsincludingcomparisonofminimumcontainmentrecirculationsumplevelswiththe602'-10"vortexinglevel,~theanalyticalresultsforMode3LOCAeventsincludingcomparisonofminimumrecirculationsumplevelswiththeminimumvortexinglevelsdeterminedinAttachment9,~theanalyticalresultsforMSLBevents,and~conclusionsofthecontainmentrecirculationsumpinventoryanalyses.Theavailablenetpositivesuctionhead(NPSH)fortheECCSpumpsandCTSpumpsisdependentontheminimumwaterlevelsinthecontainmentrecirculationsump.AnalyseshavebeenperformedthatdemonstrateadequateavailableNPSHfor,theECCSpumpsandCTSpumpsisassuredwhenthepumpsarealignedtotakesuctionfromthecontainmentrecirculationsump.TheanalysesalsodemonstratethattheminimumvortexinglevelsinthecontainmentrecirculationsumparemorelimitingthantherequiredNPSHlevelsfortheECCSpumpsandCTSpumps.TheanalysesforensuringadequateNPSHconsideredeachofthepossibleoperatingconfigurationsfortheECCSpumpsandCTSpumpsfollowingaLOCA.TheseoperatingconfigurationsincludeinitialECCSinjectionandCTSoperation,RCScoldlegrecirculation,RCShotlegrecirculation,andtheallowableoperatingconfigurationswhenresidualheatremoval(RHR)containmentsprayisplacedintoservicefollowingalargebreakLOCA.Inaddition,IEcMhasevaluatedminimumvortexinglevelsatreducedECCSpumpandCJSpumpflowratesasfurtherdescribedinAttachments7and.9,andhasdemonstratedacceptablemarginforthescenariosthatinvolvelowerpumpflowrates.Forthelowflowcases,thevortexinglevelsarestillboundingandprovidemarginabovetherequiredNPSHfortheECCSpumpsandCTSpumps.
Attachment1toC1099-08Page14valuatioofenaleIacedteenec'uIueAsfurtherdescribedinWCAP-15302(Attachment10),anevaluationwasperformedtodeterminetheimpactoftheproposedT/SchangesontheexistingCNPaccidentanalyses.ThisevaluationdemonstratesthattheaccidentanalysesarenotadverselyaffectedbytheproposedT/S'hanges.TheanalysesprovidedinWCAP-15302reflecttheproposedchangesinletterC0999-11,"LicenseAmendmentRequestforCreditofRodClusterControlAssembliesforColdLegLargeBreakLoss-of-CoolantAccidentSubcriticality,"datedSeptember17,1999.valtiofDe'rainacmtec'c'imceeThecontainmentrecirculationsumpisprovidedwithascreenandgratingstructurethatpreventsdebrisfromenteringtheECCSpumpsandCTSpumps.Thisscreenisdesignedtoprovidesufficientflowtopreventvortexinginthecoritainmentrecirculationsumpwithamaximumblockageof50%.ThisdesigncapabilitywasdemonstratedinthecontainmentrecirculationsumptestingperformedbyAldenResearchLaboratory.Aspreviouslydescribed,modificationsarebeingmadetothecontainmentstructurestoprovidepositivecommunicationbetweenthepipeannulusregionandtheRCSloop,compartment.Thesemodificationsconsistofaddingseveralpenetrationsinthecontainmentpartitionwallatlowelevations.Theflowratethroughthecontainmentcranewallandnewcontainmentpartitionwallpenetrationswillbesmall.Theresultinglowapproachvelocitieswillminimizedebristransport.Inaddition,curbsandtrashgratingswillbeprovidedsomedistancefromthepenetrationstominimizepotentialforblockageofthepenetrations,andtherearemultiplepenetrationsintwoseparateareastofurtherprotectagainstblockage.Therefore,theprobabilityofblockageofthescreensforthecontainmentrecirculationsumpisnotincreased.1F.SummaryofImpactoftheProposedChangesTheproposedT/Schangeswillensurethecapabilityofthecontainmentrecirculationsump,andthecontainmentstructures,systems,andcomponents,tomeettheoriginaldesignbasisrequirementsforthefacility.Byensuringsufficientwaterinventoryismaintainedtopreventvortexinginthecontainmentrecirculationsump,theoriginalevaluationoftheconsequencesofpreviouslyevaluatedaccidentsasdescribedintheCNPUFSARwillnotbeaffected.Thephysicalmodificationstobeimplementedareintendedtoensuretheoriginaldesignbasisfunctionalcapabilitiesofthecontainmentrecirculationsump,andothercontainmentsystems,structures,andcomponents,tosupportECCS,icecondenser,andCTSoperation.TheproposedT/Schangesensurethatthecontainmentstructureandsystemsprovideaneffectivebarriertothereleaseoffissionproducts.
Attachment1toC1099-08Page15G.ImpactonPreviousSubmittalsNoprevioussubmittalsaffectthetechnicalbasisforthissubmittal,orrequireapprovaltosupportthissubmittal.However,severalprevioussubmittalsaffectT/SpagesandassociatedT/SBasespagesthataresubmittedinthisrequest.Theseincludeletters:1)AEP:NRC:0433Q,"TechnicalSpecificationsChangeRequest-AdministrativeChanges,"datedDecember3,1998;2)AEP:NRC:09000,"TechnicalSpecificationsChangeRequest-IceCondenserFlowChannels,"datedDecember3,1998;3)AEP:NRC:1291,"TechnicalSpecificationAmendment-DistributedIgnitionSystemTechnicalSpecificationandAssociatedBases,"datedDecember3,1998;and4)C0999-11,"LicenseAmendmentRequestforCreditofRodClusterControlAssembliesforColdLegLargeBreakLoss-of-CoolantAccidentSubcriticality,"datedSeptember16,1999.TheWestinghouseNuclearSafetyanalysesprovidedinWCAP-15302(Attachment10)reflecttheproposedchangesinletterC0999-11,withbothsubmittalsreflectingthesamesubcriticalityanalyses.TheT/SandT/SBasespagesinAttachments2A,2B,3A,and3Bdonotreflectthechangesproposedintheotherexistingsubmittals.Fortheseandanyfuturesubmitt'alsthataffecttheT/SandT/SBasespagesprovidedinthissubmittal,IAMwillcoordinatechangestothepageswith.theNRCPxojectManagertoensureproperT/SandT/SBasespagecontrolwhentheassociatedlicenseamendmentrequestsareapproved.