ML17328A753
| ML17328A753 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 10/29/1990 |
| From: | INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
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| ML17328A752 | List: |
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| NUDOCS 9011020047 | |
| Download: ML17328A753 (16) | |
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ATTACHMENT2TOAEP:NRC:08940PROPOSEDREVISEDTECHNICALSPECIFICATIONPAGES90ii02004790i029'DRADOCK050003i5PPNU
.~4 REACTIVITYCONTROLSYSTEMSCHARGINGPUMP-SHUTDOWNLIMITINGCONDITIONFOROPERATION3.1.2.3a.OnechargingpumpintheboroninjectionflowpathrequiredbySpecification3.1.2.1shallbeOPERABLEandcapableofbeingpoweredfromanOPERABLEemergencybus.b.OnechargingflowpathassociatedwithsupportofUnit2shutdownfunctionsshallbeavailable.APPLICABILITY:Specification3.1.2.3.a.-MODES5and6Specification3.1.2.3.b.-AtalltimeswhenUnit2isinMODES1,2,3,or4.ACTION'.WithnochargingpumpOPERABLE,suspendalloperationsinvolvingCOREALTERATIONSorposi.tivereactivitychanges.**b.WithmorethanonechargingpumpOPERABLEorwithasafetyinjectionpump(s)OPERABLEwhenthetemperatureofanyRCScoldlegislessthan0orequalto152F,unlessthereactorvesselheadisremoved,removetheadditionalchargingpump(s)andthesafetyinjectionpump(s)motorcircuitbreakersfromtheelectricalpowercircuitwithinonehour.c.TheprovisionsofSpecification3.0.3arenotapplicable.Inadditiontotheabove,whenSpecification3.1.2.3.bisapplicableandtherequiredflowpathisnotavailable,returntherequiredflowpathtoavailablestatuswithin7days,orprovideequivalentshutdowncapabilityinUnit2andreturntherequiredflowpathtoavailablestatuswithinthenext60days,orhaveUnit2inHOTSTANDBYwithinthenext12hoursandHOTSHUTDOWNwithinthefollowing24hours.e.TherequirementsofSpecification3.0.4arenotapplicablewhenSpecification3.1.2.3.bapplies.SURVEILLANCEREUIREMENTS4.1.2.3.1TheaboverequiredchargingpumpshallbedemonstratedOPERABLEbyverifying,thatonrecirculationflow,thepumpdevelopsadischargepressureofgreaterthanorequalto2390psigwhentestedpursuanttoSpecification4.0.5atleastonceper31days.+AmaximumofonecentrifugalchargingpumpshallbeOPERABLEwheneverthe0temperatureofoneormoreoftheRCScoldlegsislessthanorequalto152F.~~Forpurposesofthisspecifi,cation,additionofwaterfromtheRWSTdoesnotconstituteapositivereactivityadditionprovidedtheboronconcentrationintheRWSTisgreaterthantheminimumrequiredbySpecification3.1.2.7.b.2.COOKNUCLEARPLANT-UNIT13/41-11AMENDMENTNO.
REACTIVITYCONTROLSYSTEMSCHARGINGPUMP-SHUTDOWNLIMITINGCONDITIONFOROPERATION4.1.2.3.2Allchargingpumpsandsafetyinjectionpumps,excludingtheaboverequiredOPERABLEchargingpump,shallbedemonstratedinoperablebyverifyingthatthemotorcircuitbreakershavebeenremovedfrom'heirelectricalpowersupplycircuitsatleastonceper12hours,exceptwhen:a.Thereactorvesselheadisremoved,or0b.ThetemperatureofallRCScoldlegsisgreaterthan152F4.1.2.3.3Charginglinecross-tievalvestoUnit2willbecycledfulltravelatleastonceper18months.Followingcycling,thevalveswillbeverifiedtobeintheirclosedpositions.COOKNUCLEARPLANT-UNIT13/41-llaAMENDMENTNO.
REACTORCOOLANTSYSTEMSHUTDOWNLIMITINGCONDITIONFOROPERATION3.4.1.3a.ThecoolantloopslistedbelowshallbeOPERABLEandinoperationasrequiredbyitemsbandc:1.ReactorCoolantLoop1anditsassociatedsteamgeneratorandreactorcoolantpump,~2.ReactorCoolantLoop2anditsassociatedsteamgeneratorandreactorcoolantpump,*3.ReactorCoolantLoop3anditsassociatedsteamgeneratorandreactorcoolantpump,*4.ReactorCoolantLoop4anditsassociatedsteamgeneratorandreactorcoolantpump,*5.ResidualHeatRemoval-East,~~6.ResidualHeatRemoval-West,*~b.AtleasttwooftheabovecoolantloopsshallbeOPERABLEandatleastoneloopinoperationifthereactortripbreakersareintheopenposition,orthecontrolroddrivesystemisnotcapableofrodwithdrawal.~**c.AtleastthreeoftheabovereactorcoolantloopsshallbeOPERABLEandinoperationwhenthereactortripsystembreakersareintheclosedpositionandthecontrolroddrivesystemiscapableofrodwithdrawal.APPLICABILITY:MODES4and5+AreactorcoolantpumpshallnotbestartedwithoneormoreoftheRCScoldlegtemperatureslessthanorequalto152Funless1)thepressurizer!0watervolumeislessthan62%ofspanor2)thesecondarywater0temperatureofeachsteamgeneratorislessthan50FaboveeachoftheRCScoldlegtemperatures.Operabilityofareactorcoolantloop(s)doesnotrequireanOPERABLEauxiliaryfeedwatersystem.**ThenormaloremergencypowersourcemaybeinoperableinMODE5.>*>Allreactorcoolantpumpsandresidualheatremovalpumpsmaybede-energizedforupto1hourprovided1)nooperationsarepermittedthatwouldcausedilutionofthereactorcoolantsystemboronconcentration+~**,and2)coreoutlettemperatureismaintainedatleast010Fbelowsaturationtemperature.****Forpurposesofthisspecification,additionofwaterfromtheRWSTdoesnotconstituteadilutionactivityprovidedtheboronconcentrationintheRWSTisgreaterthanorequaltotheminimumrequiredbyspecification3.1.2.8.b.2(MODE4)or3.1.2.7.b.2(MODE5).D.C.COOK-UNIT13/44-3AMENDMENTNO.
REACTORCOOLANTSYSTEM34.4.9PRESSURETEMPERATURELIMITSREACTORCOOLANTSYSTEMLIMITINGCONDITIONFOROPERATION3.4.9.1TheReactorCoolantSystem(exceptthepressurizer)temperatureandpressureshallbelimitedinaccordancewiththelimitlinesshownonFigures3.4-2and3.4-3duringheatup,cooldown,criticality,andinserviceleakandhydrostatictestingwith:a.Amaximumheatupof60Finanyonehourperiod,0b.Amaximumcooldownof100Finanyonehourperiod,and0c.Amaximumtemperaturechangeof<5Finanyonehourperiod,0duringhydrostatictestingoperationsabovesystemdesignpressure.APPLICABILITY:Atalltimes'ACTION:Withanyoftheabovelimitsexceeded,restorethetemperatureand/orpressuretowithinthelimitwithin30minutes;performananalysistodeterminetheeffectsoftheout-of-limitconditiononthefracturetoughnesspropertiesoftheReactorCoolantSystem;determinethattheReactorCoolantSystemremainsacceptableforcontinuedoperationsorbeinatleastHOTSTANDBYwithinthenext6hoursandreducetheRCSTavgandpressuretolessthan200Fand500psig,respectively,withinthefollowing30hours.*SeeSpecialTextException3.10.3.COOKNUCLEARPLANT-UNIT13/44-25 onooIC:KM260024002200"REACTORCOOLANTSYSTEMHEATUPLIMITATIONSAPPLICABLEFORFIRST32EFFECTIVEFULLPOWERYEARS(MARGINSOF60PSIGAND10FAREINCLUDED'ORPOSSIBLEINSTRUMENTERROR.)MCOCI.IIICCDCIIIIICCCLCllX6IJJI-CoIIVCOI-XooOoIotljCC200018001600140012001000800600LEAKTESTLIMIT-UNACCEPTABLEOPERATIONPRESSURE-TEMPERATURELIMITFORHEATUPRATESUPTO600F/HR--------CRITICALITYLIMITACCEPTABLEOPERATIONIllXoIll'zXo4002000L50100MATERIALPROPERTYBASISINTERMEDIATEPLATE,B4406-3Cu~.15Y,Ni~.49IINITIALRT400F.32EFPYRT1/4T~171F3/4T1360FL.I4004501502002503003500AVERAGEREACTORCOOLANTSYSTEMTEMPERATURE(F)FIGURE3.4-2REACTORCOOLANTSYSTEMPRESSURE-TEMPERATURELIMITSVERSUS6dF/HRRATECRITICALITYLIMITANDHYDROSTATICTESTLIMIT OoAooXIM260024002200REACTORCOOLANTSYSTEMCOOLDOWNLIHITATIONSAPPLICABLEFORFIRST32EFFECTIVEFULLPOWERYEARS(MARGINSOF60PSIGAND10FAREINCLUDEDFORPOSSIBLEINSTRUMENTERROR.)200018001600(g)1400I0-z1200o1000oI-oPRESSURE-TEMPERATURELIMITSUNACCEPTABLEOPERATIONACCEPTABLEOPERATION600400200COOLDOWNRATEDF/HR%860100HATERIALPROPERTYBASISINTERMEDIATEPLATE,B4406-3Cu.15X,Ni.49%INITIALRT40F32EFPYRT1/4T~171F3/4T~138DFITlKoPl'zI50100150200250300350AVERAGEREACTORCOOLANTSYSTEMTEHPERATURE(F)0FIGURE3.4-3400450KoREACTORCOOLANTSYSTEHPRESSURE-TEMPERATURELIHITSVERSUSCOOLDOWHRATES REACTORCOOLANTSYSTEMOVERPRESSUREPROTECTIONSYSTEMSLIMITINGCONDITIONFOROPERATION3.4.9.3AtleastoneofthefollowingoverpressureprotectionsystemsshallbeOPERABLE:a.Twopoweroperatedreliefvalves(PORVs)withaliftsettingoflessthanor'qualto435psig,orb.Onepoweroperatedreliefvalve(PORV)withaliftsettingoflessthanorequalto435psigandtheRHRsafetyvalvewithaliftsettingoflessthanorequalto450psig,orc.Areactorcoolantsystemventofgreaterthanorequalto2squareinches.APPLICABILITY:WhenthetemperatureofoneormoreoftheRCScoldlegsis0lessthanorequalto152F,exceptwhenthereactorvesselheadisremoved.ACTION'ithtwoPORV'sinoperableorwithonePORVinoperableandtheRHRsafetyvalveinoperable,eitherrestoretheinoperablePORV(s)orRHRsafetyvalvetoOPERABLEstatuswithin7daysordepressurizeandventtheRCSthroughanatleast2squareinchvent(s)withinthenext8hours;maintaintheRCSinaventedconditionuntiltheinoperablePORVorRHRsafetyvalvehasbeenrestoredtoOPERABLEstatus.b.WithbothPORVsinoperable,depressurizeandventtheRCSthroughanatleast2squareinchvent(s)within8hours;maintaintheRCSinaventedconditionuntilbothPORVsoronePORVandtheRHRsafetyvalvehavebeenrestoredtoOPERABLEstatus.IntheeventeitherthePORVs,theRHRsafetyvalveortheRCSvent(s)areusedtomitigateaRCSpressuretransient,aSpecialReportshallbepreparedandsubmittedtotheCommissionpursuanttoSpecification6.9.2within30days.Thereportshalldescribethecircumstancesinitiatingthetransient,theeffectofthePORVsorvent(s)onthetransientandanycorrectiveactionnecessarytopreventrecurrence.d.TheprovisionsofSpecification3.0.4arenotapplicable.COOKNUCLEARPLANT-UNIT13/44-31AMENDMENTNO.
EMERGENCYCORECOOLINGSYSTEMSECCSSUBSYSTEMS-Tav(350FLIMITINGCONDITIONFOROPERATION3.5.3Asaminimum,oneECCSsubsystemcomprisedofthefollowingshallbeOPERABLE:a.OneOPERABLEcentrifugalchargingpump,¹b.OneOPERABLEresidualheatremovalheatexchanger,c.OneOPERABLEresidualheatremovalpump,andd.AnOPERABLEflowpathcapableoftakingsuctionfromtherefuelingwaterstoragetankuponbeingmanuallyrealignedandtransferringsuctiontothecontainmentsumpduringtherecirculationphaseofoperation.APPLICABILITY:MODE4.ACTION:a~WithnoECCSsubsystemOPERABLEbecauseoftheinoperabilityofeitherthecentrifugalchargingpumportheflowpathfromtherefuelingwaterstoragetank,restoreatleastoneECCSsubsystemtoOPERABLEstatuswithin1hourorbeinCOLDSHUTDOWNwithinthenext20hours.b.WithnoECCSsubsystemOPERABLEbecauseoftheinoperabilityofeithertheresidualheatremovalheatexchangerorresidualheatremovalpump,restoreatleastoneECCSsubsystemtoOPERABLE0statusormaintaintheReactorCoolantSystemTavglessthan350Fbyuseofalternateheatremovalmethods.WithmorethanonechargingpumpOPERABLEorwithasafetyinjectionpump(s)OPERABLEwhenthetemperatureofanyRCScoldlegislessthanorequalto152F,removetheadditionalchargingpump(s)andthesafetyinjectionpump(s)motorcircuitbreakersfromtheelectricalpowercircuitwithin1hour.d.IntheeventtheECCSisactuatedandinjectswaterintotheReactorCoolantSystem,aSpecialReportshallbepreparedandsubmittedtotheCommissionpursuanttoSpecification6.9.2within90daysdescribingthecircumstancesoftheactuationandthetotalaccumulatedactuationcyclestodate.¹AmaximumofonecentrifugalchargingpumpshallbeOPERABLEandbothsafetyinjectionpumpsshallbeinoperablewheneverthetemperatureofoneormoreoftheRCScoldlegsislessthanorequalto152F.COOKNUCLEARPLANT-UNIT13/45-7AMENDMENTNO.
EMERGENCYCORECOOLINGSYSTEMSSURVEILLANCEREUIREMENTS4.5'.1TheECCSsubsystemshallbedemonstratedOPERABLEpertheapplicableSurveillanceRequirementsof4.5.2.*4.5.3.2Allchargingpumpsandsafetyinjectionpumps,excepttheaboverequiredOPERABLEchargingpump,shallbedemonstratedinoperable,byverifyingthatthemotorcircuitbreakershavebeenremovedfromtheirelectricalpowersupplycircuits,atleastonceper12hourswheneverthetemgeratureofoneormoreoftheRCScoldlegsislessthanorequalto152FasdeterminedatleastonceperhourwhenanyRCScoldlegtemperatureisbetween152Fand200F.*TheprovisionsofSpecification4.0.6areapplicable.COOKNUCLEARPLANT-UNIT13/45-8AMENDMENTNO.
34.1REACTIVITYCONTROLSYSTEMSBASES34.1.1.4MODERATORTEMPERATURECOEFFICIENTMTCContinuedconcentrationassociatedwithfuelburnup.TheconfirmationthatthemeasuredandappropriatelycompensatedMTCvalueiswithintheallowabletoleranceofthepredictedvalueprovidesadditionalassurancesthatthecoefficientwillbemaintainedwithinitslimitsduringintervalsbetweenmeasurement.34.1.1.5MINIMUMTEMPERATUREFORCRITICALITYThisspecificationensuresthatthereactorwillnotbemadecritical0withtheReactorCoolantSystemaveragetemperaturelessthan541F.Thislimitationisrequiredtoensure1)themoderatortemperaturecoefficientiswithinitsanalyzedtemperaturerange,2)theprotectiveinstrumentationiswithinitsnormaloperatingrange,and3)thepressurizeriscapableofbeinginanOPERABLEstatuswithasteambubble,and4)thereactorpressurevesselisaboveitsminimumRTtemperature.Administrativeprocedureswillbeestablishedtoensuret5eP-12blockedfunctionsareunblockedbeforetakingthereactorcritical.34.1.2BORATIONSYSTEMSTheboroninjectionsystemensuresthatnegativereactivitycontrolisavailableduringeachmodeoffacilityoperation.Thecomponentsrequiredtoperformthisfunctioninclude1)boratedwatersources,2)chargingpumps,3)separateflowpaths,4)boricacidtransferpumps,5)associatedheattracingsystems,and6)anemergencypowersupplyfromOPERABLEdieselgenerators.WiththeRCSaveragetemperatureabove200F,aminimumoftwoseparate0andredundantboroninjectionsystemsareprovidedtoensuresinglefunctionalcapabilityintheeventanassumedfailurerendersoneofthesystemsinoperable.Allowableout-of-serviceperiodsensurethatminorcomponentrepairorcorrectiveactionmaybecompletedwithoutunduerisktooverallfacilitysafetyfrominjectionsystemfailuresduringtherepairperiod.ThelimitationforamaximumofonecentrifugalchargingpumptobeOPERABLEandtheSurveillanceRequirementtoverifyallchargingpumpsandsafetyinjectionpumgs,excepttherequiredOPERABLEchargingpump,tobeinoperablebelow152F,unlessthereactorvesselheadisremoved,providesassurancethatamassadditionpressuretransientcanberelievedbytheoperationofasinglePORV.TheborationcapabilityofeithersystemissufficienttoprovidetherequiredSHUTDOWNMARGINfromalloperatingconditionsafterxenondecayandcooldownto200F.Themaximumexpectedborationcapability,usablevolume0requirement,is5641gallonsof20,000ppmboratedwaterfromtheboricacid.storagetanksor99,598gallonsof2400ppmboratedwaterfromtherefuelingwaterstoragetank.TheminimumcontainedRWSTvolumeisbasedonECCSconsiderations.SeeSectionB3/4.5.5.COOKNUCLEARPLANT-UNIT1B3/41-2AMENDMENTNO.
34.4REACTORCOOLANTSYSTEMBASES34.4.1REACTORCOOLANTLOOPSTheplantisdesignedtooperatewithallreactorcoolantloopsinoperation,andmaintainDNBRabove1.69duringallnormaloperationsandanticipatedtransients.AlossofflowintwoloopswillcauseareactortripifoperatingaboveP-7(11percentofRATEDTHERMALPOWER)whilealossoflowinoneloopwillcauseareactortripifoperatingaboveP-8(31percentofRATEDTHERMALPOWER).InMODE3,asinglereactorcoolantloopprovidessufficientheatremovalcapabilityforremovingdecayheat;however,singlefailureconsiderationsrequirethattwoloopsbeOPERABLE.ThreeloopsarerequiredtobeOPERABLEandtooperateifthecontrolrodsarecapableofwithdrawalandthereactortripbreakersareclosed.TherequirementassuresadequateDNBRmarginintheeventofanuncontrolledrodwithdrawalinthismode.InMODES4and5,asinglereactorcoolantlooporRHRloopprovidessufficientheatremovalcapabi.lityforremovingdecayheat;butsinglefailureconsiderationsrequirethatatleasttwoloopsbeOPERABLE.Thus,ifthereactorcoolantloopsarenotOPERABLE,thisspecificationrequirestwoRHRloopstobeOPERABLE.TheoperationofoneReactorCoolantPumporoneRHRpumpprovidesadequateflowtoensuremixing,preventstratificationandproducegradualreactivitychangesduringboronconcentrationreductionsintheReactorCoolantSystem.Thereactivitychangerateassociatedwithboronreductionwill,therefore,bewithinthecapabilityofoperatorrecognitionandcontrol.TherestrictionsonstartingaReactorCoolantPumpbelowP-7withoneormoreRCScoldlegslessthanorequalto152FareprovidedtopreventRCSpressuretransients,causedbyenergyadditionsfromthesecondarysystem,whichcouldexceedthelimitsofAppendixGto10CFRPart50.TheRCSwillbeprotectedagainstoverpressuretransientsandwillnotexceedthelimitsofAppendixGbyeither(1)restrictingthewatervolumeinthepressurizerandtherebyprovidingavolumefortheprimarycoolanttoexpandintoor(2)byrestrictingstartingoftheRCP'stowhenthesecondarywatertemperatureofeachsteamgeneratorislessthan50FaboveeachoftheRCScoldleg0temperatures.COOKNUCLEARPLANT-UNIT1B3/44-1AMENDMENTNO.
REACTORCOOLANTSYSTEMBASES34.4.9PRESSURETEMPERATURELIMITSAllcomponentsintheReactorCoolantSystemaredesignedtowithstandtheeffectsofcyclicloadsduetosystemtemperatureandpressurechanges.Thesecyclicloadsareintroducedbynormalloadtransients,reactortrips,andstartupandshutdownoperations.ThevariouscategoriesofloadcyclesusedfordesignpurposesareprovidedinSection4.1.4oftheFSAR.Duringstartupandshutdown,theratesoftemperatureandpressurechangesarelimitedsothatthemaximumspecifiedheatupandcooldownratesareconsistentwiththedesignassumptionsandsatisfythestresslimitsforcyclicoperation.AnIDorODone-quarterthicknesssurfaceflawispostulatedatthelocationinthevesselwhichisfoundtobethelimitingcase.Thereareseveralfactorswhichinfluencethepostulatedlocation.Thethermalinducedbendingstressduringheatupiscompressiveontheinnersurfacewhiletensileontheoutersurfaceofthevesselwall.Duringcooldownthebendingstressprofileisreversed.Inaddition,thematerialtoughnessisdependentuponirradiationandtemperatureandthereforethefluenceprofilethroughthereactorvesselwall,therateofheatupandalsotherateofcooldowninfluencethepostulatedflawlocation.Theheatuplimitcurve,Figure3.4-2,isacompositecurvewhichwaspreparedbydeterminingthemostconservativecase,witheithertheinside0oroutsidewallcontrolling,foranyheatuprateupto60Fperhour.ThecooldownlimitcurvesofFigure3.4-3arecompositecurveswhichwerepreparedbaseduponthesametypeanalysiswiththeexceptionthatthecontrollinglocationisalwaystheinsidewallwherethecooldownthermalgradientstendtoproducetensilestresseswhile,producingcompressivestressesattheoutsidewall.Theheatupandcooldowncurveswerepreparedbaseduponthemostlimitingvalueofthepredictedadjustedreferencetemperatureattheendof32EFPY.Reactoroperationandresultantfastneutron(E)1Mev)irradiationwillcauseanincreaseintheRTN.Therefore,anadjustedreferencetemperature,baseduponthefluence,andPhecopperandnickelcontentofthematerialmustbepredicted.TheheatupandcooldownlimitcurvesofFigures3.4-2and3.4-3includetheadjustedRTattheendof32EFPY,aswellasadjustmentsforpossibleerrorsinthepressureandtemperaturesensinginstruments.COOKNUCLEARPLANT-UNIT1B3/44-6AMENDMENTNO.
REACTORCOOLANTSYSTEMBASESThe32EFPYheatupandcooldowncurvesweredevelopedbasedonthefollowing:1.Theintermediateshellplate,B4406-3,beingthelimitingmaterial'ithacopperandnickelcontentof.15%and.49%respectively.2.ThefluencevaluescontainedinTable6-14ofWestinghouse'sWCAP-12483report,"AnalysisofCapsuleUFromtheAmericanElectricPowerCompanyD.C.CookUnit1ReactorVesselRadiationSurveillanceProgram,"datedJanuary1990.3.Figure1,NRCRegulatoryGuide1.99,Revision2TheshiftinRTNofthereactorvesselmaterialhasbeenestablishedbyremovingandevaluatingthematerialsurveillancecapsulesinstalledneartheinsidewallofthereactorvesselinaccordancewiththeremovalscheduleinTable4.4-5.Perthisschedule,CapsuleUisthelastcapsuletoberemoveduntilCapsuleSistoberemovedafter32EFPY(EOL).CapsuleV,W,andZwillremaininthereactorvessel,andwillberemovedtoaddressindustryreactorembrittlementconcerns,ifrequired.Thepressure-temperaturelimitlinesshownonFigure3.4-2forreactorcriticalityandforinserviceleakandhydrostatictestinghavebeenprovidedtoassurecompliancewiththeminimumtemperaturerequirementsofAppendixGto10CFR50.ThenumberofreactorvesselirradiationsurveillancespecimensandthefrequenciesforremovingandtestingthesespecimensareprovidedinTable4.4-5toassurecompliancewiththerequirementsofAppendixHto10CFRPart50.ThelimitationsimposedonpressurizerheatupandcooldownandspraywatertemperaturedifferentialareprovidedtoassurethatthepressurizerisoperatedwithinthedesigncriteriaassumedforthefatigueanalysisperformedinaccordancewiththeASMECoderequirements.TheOPERABILITYoftwoPORVs,onePORVandtheRHRsafetyvalve,oranRCSventopeningofgreaterthanorequalto2squareinchesensuresthattheRCSwillbeprotectedfrompressuretransientswhichcouldexceedthelimitsofAppendixGto10CFRPart50whenoneormoreoftheRCScoldlegsarelessthanorequalto152F.EitherPORVorRHRsafetyvalvehasadequate0relievingcapabilitytoprotecttheRCSfromoverpressurizationwhenthetransientislimitedtoeither(1)thestartofanidleRCPwiththesecondary0watertemperatureofthesteamgeneratorlessthanorequalto50FabovetheRCScoldlegtemperaturesor(2)thestartofachargingpumpanditsinjectionintoawatersolidRCS.COOKNUCLEARPLANT-UNIT1B3/44-7AMENDMENTNO.
EMERGENCYCORECOOLINGSYSTEMBASESWiththeRCStemperaturebelow350F,oneOPERABLEECCSsubsystemisacceptablewithoutsinglefailureconsiderationonthebasis6fthestablereactivityconditionofthereactorandthelimitedcorecoolingrequirements.Thelimitationforamaximumofonecentri.fugalchargingpumptobeOPERABLEandtheSurveillanceRequirementtoverifyallchargingpumpsandsafetyinjectionpumps,excepttherequiredOPERABLEchargingpump,tobeinoperablebelow152FprovidesassurancethatamassadditionpressuretransientcanberelievedbytheoperationofasinglePORV.TheSurveillanceRequirementsprovidedtoensureOPERABILITYofeachcomponentensuresthatataminimum,theassumptionsusedinthesafetyanalysesaremetandthatsubsystemOPERABILITYismaintained.SurveillancerequirementsforthrottlevalvepositionstopsandflowbalancetestingprovideassurancethatproperECCSflowswillbemaintainedintheeventofaLOCA.Maintenanceofproperflowresistanceandpressuredropinthepipingsystemtoeachinjectionpointisnecessaryto:(1)preventtotalpumpflowfromexceedingrunoutconditionswhenthesystemisinitsminimumresistanceconfiguration,(2)providetheproperflowsplitbetweeninjectionpointsinaccordancewiththeassumptionsusedintheECCS-LOCAanalyses,and(3)provideanacceptableleveloftotalECCSflowtoallinjectionpointsequaltoorabovethatassumedintheECCS-LOCAanalyses.34.5.4BORONINJECTIONSYSTEMTheOPERABILITYoftheboroninjectionsystemaspartoftheECCSensuresthatsufficientnegativereactivityisinjectedintothecoretocounteractanypositiveincreaseinreactivitycausedbyRCSsystemcooldown.RCScooldowncanbecausedbyinadvertentdepressurization,aloss-of-coolantaccidentorasteamlinerupture.Thelimitsoninjectiontankminimumcontainedvolumeandboronconcentrationensurethattheassumptionsusedinthesteamlinebreakanalysisaremet.~TheOPERABILITYoftheredundantheattracingchannelsassociatedwiththeboroninjectionsystemensurethatthesolubilityoftheboronsolutionwillbemaintainedabovethesolubilitylimitof135Fat21000ppmboron.COOKNUCLEARPLANT-UNIT1B3/45-2AMENDMENTNO.