ML17331A783

Tech Specs 3.4.1.1,4.4.1.1,3.4.1.2,4.4.1.2.1,4.4.1.2.2, 3.4.1.3,4.4.1.3.1,4.4.1.3.2,4.4.1.3.3,4.4.1.3.4,3.9.8.1, 4.9.8.1,3.9.8.2,4.9.8.2,3.9.10,4.9.10,3/4.4.1,3/4.4.2, 3/4.4.3,3/4.9.6,3/4.9.7,3/4.9.8,3/4.9.9 & 3/4.9.10

ML17331A783
Person / Time
Site:	Cook
Issue date:	08/14/1981
From:	INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
Shared Package
ML17331A782	List: ML17331A781 ML17331A783
References
NUDOCS 8108250265
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REACTORCOOLANTSYSTEMSHUTDOWNLiMITINGCONDITIONFOROPERATiON3.4.1.3a.Atleasttwoo<thecoolantloopslistedbelowshallbeOPERABLE:1.ReactorCoolantLoop1anditsassociatedsteamgeneratorandreactorcoolantpump,*2.ReactorCoolantLoop2anditsassociatedsteamgeneratorandreactorcoolantpump,*3.ReactorCo'olantLoop3anditsassociatedsteamgeneratorandreactorcoolantpump,*4.ReactorCoolantLoop4andi.tsassociatedsteamgeneratorandreactorcoolantpump,*5.ResidualHeatRemoval-East,**6.ResidualHeatRemoval.-Hest,**b.Atleastoneoftheabovecoolantloopsshallbeinoperation.***APPLICABILITY:MODES4and5ACTION:a.WithlessthantheaboverequiredloopsOPERABLE,immediatelyinitiatecorrectiveactiontoreturntherequiredloopstoOPERABLEstatusassoonaspossible;beinCOLDSHUTDOWNwith-in20hours.b.Withnocoolant'locpin.operation,suspendalloperationsin-volvingareductioninboronconcentrationoftheReactorCool-'nt'ystemandimmediatelyinitiatecorrectiveactiontoreturntherequiredcoolantlooptooperation.+AreactorcoolantpumpshallnotbestartedwithoneormoreoftheRCScoldlegtemperatureslessthanorequalto188oFunless1)thepressurizerwatervolumeislessthan52.00%ofspanor2)thesecondarywatertemperatureofeachsteamgeneratorislessthan50oFaboveeachoftheRCScoldlegtemper-atures.Operabilityofareactorcoolantloop(s)doesnotrequireanOPERABLEauxiliaryfeedwatersystem.**ThenormaloremergencypowersourcemaybeinoperableinMODE5.***Allreactorcoolantpumpsandresidualheatremovalpumpsmaybede-energizedforupto1hourprovided1)nooperationsarepermittedthatwouldcausedilutionofthereactorcoolantsystemboronconcentration,and2)coreout-lettemperatureismaintainedatleast10oFbelowsaturationtemperature.D.C.Cook-Unit13/44-3 REACTORCOOLANTSYSTEMSURYEILLANCEREUIREMENTS4.4.1.3.1Therequiredresidualheatremovalloop(s)shallbedeterminedOPERABLEperSpecification4.0.5.4.4.1.3.2Therequiredreactorcoolantpump(s),ifnotinoperation,shallbedeterminedtobeOPERABLEonceper7daysbyverifyingcorrectbreakeralignmentsandindicatedpoweravailability.4.4.1.3.3Therequiredsteamgenerator(s)shallbedeterminedOPERABLEbyverifyingsecondarysideleveltobegreaterthanorequalto25>ofwiderangeinstrumentspanatleastonceper12hours.4.4.1.3.4Atleastonecoolantloopshallbeverifiedtobeinoperationandcirculatingreactorcoolantatleastonceper12hours.g,lr1~ID.C.COOK-UNIT13/44-3a REFUELINGOPERATIONS3/4.9.8RESIDUALHEATREMOVALANDCOOLANTCIRCULATIONLIMITINGCONDITIONFOROPERATION3.9.8.1Atleastoneresidualheatremovalloopshallbeinoperation.APPLICABILITY:MODE6.ACTION:a.Withlessthanoneresidualheatremovalloopinoperation,exceptasprovidedinb.below,suspendalloperationsinvolvinganincreaseinthereactordecayheatloadorareductioninboronconcentrationoftheReactorCoolantSystem.Closeallcontainmentpenetrationsprovidingdirectaccessfromthecontainmentatmospheretotheoutsideatmospherewithin4hours.b.Theresidualheatremovalloopmayberemovedfromoperationforupto1hourper8hourperiodduringtheperformanceofCOREALTERATIONSinthevicinityofthereactorpressurevesselhotlegs.c.TheprovisionsofSpecification3.0..3arenotapplicable.SURVEILLANCEREQUIREi~lENTS4~~4.9.8.1Aresidualheatremovalloopshallbedeterminedtobeinoperationandcirculatingreactorcoolanataflowrateof>3000gpmatleastonceper24hours.D.C.COOK-UNIT13j49-9 REFUELINGOPERATIONSLOWWATERLEVELLIMITINGCONOITIONFOROPERATION3.9.8.2TwoindependentResidualHeatRemoval(RHR)loopsshallbeOPERABLE.*APPLICABILITY:MOOE6whenthewaterlevelabovethetopofthereactorpressurevesselflangeislessthan23feetwiththeupperinternalsremoved.ACTION:a.WithlessthantherequiredRHRloopsOPERABLE,immediatelyinitiatecorrectiveactiontoreturntherequiredRHRloopstoOPERABLEstatusassoonaspossible.b.TheprovisionsofSpecification3.0.3arenotapplicable.SURVEILLANCEREUIREMENTS4.9.8.2TherequiredResidualHeatRemovalloopsshallbedeterminedOPERABLEperSpecification4.0.5.*ThenormaloremergencypowersourcemaybeinoperableforeachRHRloop.D.C.COOK-UNIT13/49-9a REFUELINGOPERATIONS3/4.9.10MATERLEYEL-REACTORYESSELLIHITIHGCOHDITIOHFOROPERATION3.9.10Atleast23feetofwater,shallbemaintainedoverthetopofthereactorpressurevesselflange.APPLICABILITY:DuringmovementoffuelassembliesorcontrolrodswithinthereactorpressurevesselwhileinMODE6.withtheupperinternalsremoved.ACTION:Miththerequirementsoftheabovespecificationnotsatisfied,suspendalloperationsinvolvingmovementoffuelassembliesorcontrolrodswithinthepressurevessel.TheprovisionsofSpecification3.0.3arenotapplicable.SURVEILLANCEREUIREHEHTS4.9.10Thewaterlevelsha')1bedeterminedtobeat,leastitsminimum"requireddepthwithin2hourspriortothestartofandatleastonceper24hoursthereafterduringmovementoffuelassembliesorcontrolrods.~~D.C.Cook-Unit13/49-11 3/4.4REACTORCOOLANTSY<BASES3/4.4.1REACTORCOOLANTLOOPSANDCOOLANTCIRCULATIONTheplantisdesignedtooperatewithallreactorcoolantloopsinoperation,andmaintainONBRabove1.30duringallnormaloperationsandanticipatedtransients.Inl100ES1and2withonereactorcoolantloopnotinoperationthisspecificationrequiresthatt'eplantbei.natleastHOTSTN'DBYwithin1hour.InNODE3,'singlereactorcoolantloopprovidessufficientheatremovalcapabilityforremovingdecayheat;however,singlefailurecons~rationsrequirethattwoloopsbeOPERABLE.Int<ODES4and5,asinglereactorcoolantlooporRHRloopprovidessufficientheatremovalcapabilityforremovingdecayheat;butsinglefailureconsiderationsrequirethatatleasttwoloopsbeOPERABLE.ThusifthereactorcoolantloopsarenotOPERABLE,thisspecificationrequirestwoRHRloopstobeOPERABLE.TheoperationofoneReactorCoolantPumporoneRHRpumpprovidesadequateflowtoensuremixing;preventstratificationandproducegradualreactivitychangesduringboronconcentrationreductionsintheReactorCoolantSystem.Thereactivitychanoerateassociatedwithboronreductionwill,therefore,bewithinthecapabilityofoperatorrecognitionandcontrol.TherestrictionsonstartingaReactorCoolantPumpwithoneormoreRCScoldlegsl,essthanorequalto188FareprovidedtopreventRCSpress~retransients,-causedbyenergyadditionsfromthesecondlysystem,whichcouldexcedthelimitsofAppendixGto10CFRPart50.TheRCSwillbeprotectedagainstoverpressuretransientsandwillnotexceedhelimitsofAppendixGbyeither(1)restrictingthewatervolumeinthepressurizerandtherebyprovidingavolumefortheprimarycoolanttoexpandinto,or(2)byrestrictingstartingoftheRCPstowhenthesecondarywatertrapratureofeachsteamgeneratorislessthan50FaboveeachoftheRCScoldlegtemperatures.0.C.Cook-Unit183/44-1 3/4.4REACTORCOOLANTSYSTe.l8ASES3/4.4.2and3/<.4.3SAFETYVAL'/ESThepressurizercodesafetyvalvesoperatetopreventtheRCSfrombeingpressurizedaboveitsSafetyLimitof2735psia.Eachsaetyvalveisdesignedtorelieve420,000lbsperhourofsaturatedsteamatthevalvesetpoint.Thereliefcapacityofasinglesafetyvalveisadeauatetorelieveanyoveroressureconditionuhichcouldoccurduringshutdown.IntheeventthatnosafetyvalvesareOPERABLE,anooeratingRHRlooo,connectedtotheRCS,providesoverpressurereliefcapabilityandwillpteventRCSoverpressurization.Ouringoperation,a11pressurizercodesafetyvalvesmustbeOPERA8LEtopreventtheRCSfrombeingoressurizedaboveitssafetyIimitof2735psig.Thecombinedreliefcapacityofallofthesevalvesisgreaterthanthemaximumsurgeraterosultinafromacomoletelossofloadassumingnoreactortripuntilthefirs~ReactorProtectiveSystemtripsetpoint:sreached(i.e.,nocreditistaken,oradirectroactortriponthelossorload)andalsoassuminanoooerationafthepoweroperaedreliefvalves.orsteamdumpvalves.Oemonstrationofthe'afetyvalves'i,tsettinasui11occuronlyduringshudownandwillbeperformedinaccordanceuiththe"rovisicnsofSectionXIoftheASl1EBoilerandPressureCode,1974Edition.0.C.COOK-Ui'(ITI83/44-Ia REFUELINGOPERATIONSBASES3/4.9.6MANIPULATORCRANEOPERABILITYTheOPERABILITYrequirementsforthemanipulatorcranesensurethat:1)manipulatorcraneswillbeusedformovementofcontrolrodsandfuelassemblies2)eachcranehassufficientloadcapacitytoliftacontrolrodorfuelassemblyand3)thecoreinternalsandpressurevesselareprotectedfromexcessiveliftingforceintheeventtheyareinadvertentlyengageddur-ingliftiingoperations.'I3/4.9.7CRANETRAVEL-SPENTFUELSTORAGEBUILDINGTherestrictiononmovementofloadsinexcessofthenominalweightofafuelassemblyoverotherfuelassembliesensuresthatnomorethanthecontentsofonefuelassemblywillberupturedintheeventofafuelhandlingaccident.Thisassumptionisconsistentwiththeactivityreleaseassumedintheaccidentanalyses.3/4.9.8RESIDUALHEATREMOVALANDCOOLANTCIRCULATIONTherequirementthatatleastoneresidualheatremoval(RHR)loopbeinoperationensuresthat(1)sufficientcoolingcapacityisavailabletoremovedecayheatandmaintainthewaterinthereactorpressurevesselbelow140oFasrequiredduringtheREFUELINGMODE,and(2)sufficientcoolantcirculationismaintainedthroughthereactorcoretominimizetheeffectofaborondilutionincidentandpreventboronstratification.TherequirementtohavetwoRHRloopsOPERABLEwhenthereislessthan23feetofwaterabovethereactorpressurevesselflangeensuresthatasinglefailureoftheoperatingRHRloopwillnotresultinacompletelossofresidualheatremovalcapability.Withthereactorvesselheadremovedand23feetofwaterabovethereactorpressurevesselflange,alargeheatsinkisavailableforcorecooling.Thus,intheeventofafailureoftheoperatingRHRloop,adequatetimeisprovidedtoinitiateemergencyprocedurestocoolthecore.3/4.9.9CONTAINMENTPURGEANDEXHAUSTISOLATIONSYSTEMTheOPERABILITYofthissystemensuresthatthecontainmentventandpurgepenetrationswillbeautomaticallyisolatedupondetectionofhighradiationlevelswithinthecontainment.TheOPERABILITYofthissystemisrequiredtorestrictthereleaseofradioactivematerialfromthecontain-mentatmospheretotheenvironment.D.C.COOK-UNIT1B3/49-3 REFUELINGOPERATIONSBASES3/4.9.10and3/4.9.11lriATERLEVEL-REACTORVESSELANDSTORAGEPOOLTherestrictionsonminimumwaterlevelensurethatsufficientwaterdepthisavailabletoremove99KoftheassumedlOXiodinegapactivityreleasedfrom.theruptureofanirradiatedfuelassembly.Theminimumwaterdepthisconsistentwiththeassumptionsoftheaccidentanalysis.3/4.9.12STORAGEPOOLVENTILATIONSYSTEMThelimitationsonthestoragepoolventilationsystemensurethatallradioactivematerialreleasedfromanirradiatedfuelassembly'willbefilteredthroughtheHEPAfiltersandcharcoaladsorberpriortodischargetotheatmosphere.TheOPERABILITYofthissystemandtheresultingiodineremovalcapacityareconsistentwiththeassumptionsoftheaccidentanalyses.3/4.9.13SPENTFUELCASKMOVEMENTThelimitationsofthisspecificationensuresthat,duringin-sertionorremovalofspentfuelcasksfromthespentfuelpool,fuelcaskmovementwillbeconstrainedtothepathandliftheightassumedintheCaskDropProtectionSystemsafetyanalysis.Restrict-ingthespentfuelcaskmovementwithintheserequirementsprovidesprotectionforthespentfuelpoolandstoredfuelfromtheeffectsofafuelcaskdropaccident.3/4.9.14SPENTFUELCASKDROPPROTECTIONSYSTEMThelimitationsontheuseofspentfuelcasksweighinginexcessof110tons(nominal)-providesassurancethatthespentfuelpoolwouldnotbedamagedbyadroppedfuelcasksincethisweightisconsistentwiththeassumptionsusedinthesafetyanalysisfortheperformanceoftheCaskDropProtectionSystem.D.C.COOK-UNIT1IB3/49-4 AttachmentNo.3toAEP:NRC:00420ADonaldC.CookNuclearPlantUnitNos.1and2DecayHeatRemovalTechnicalSpecifications

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REACTOR'".GOLANTSYSTEMSHUTDOWNLIMITINGCONDITIONFOROPERATION3.4.1.3a.AtleasttwoofthecoolantloopslistedbelowshallJ1.ReactorCoolantLoop1anditsassociatedsteamreactorcoolantpump,*beOPERABLE:generatorand2.ReactorCoolantLoop2anditsassociatedsteamgeneratorandreactorcoolantpump,*3.ReactorCoolantLoop'anditsassociatedsteamgeneratorandreactorcoolantpump,*4.ReactorCoolantLoop4anditsassociatedsteamgeneratorandreactorcoolantpump,*5.ResidualHeatRemoval-East,**6.ResidualHeatRemoval-West"'.Atleastoneoftheabovecoolantloopsshallbeinoperation.**"APPLICABILITY:MODES4and5ACTION:a.Withlessthantheaboverequired,loopsOPERABLE,immediatelyinitiatecorrectiveactiontoreturntherequiredloopstoOPERABLEstatusassoonaspossible;beinCOL'DSHUTDOWNwith-in20hours.b.Withnocoolantloopinoperation,suspendalloperatiorsin-volvingareductioninboronconcentrationoftheReactorCool-antSystemandimmediatelyinitiatecorrectiveactiontoreturntherequiredcoolantlooptooperation.'AreactorcoolantpumpshallnotbestartedwithoneormoreoftheRCSco!dlegtemperatureslessthanorequalto152oFunless1)thepressu~izerwatervolumeislessthan62.00Kofspanor2)thesecondarywatertemperatureofeachsteamgeneratorislessthan50FaboveeachoftheRCScoldlegtemper-atures.Operabilityofareactorcoolantloop(s)doesnotrequireanOPERABLEauxiliaryfeedwatersystem.**ThenormaloremergencypowersourcemaybeinoperableinMODE5.-""Allreactorcoolantpumpsandresidualheatremovalpumpsmaybede-energizedforuoto1hourprovided1)nooperationsarepermittedthatwouldcausedilutionofthereactorcoolantsystemboronconcentration,and2)coreout-lettemperatureismaintainedatleast10oFbelowsaturationtempera;ure.D.C.Cook-Unit23/44-3 REACTORCOOLANTSYSTEMSURVEILLANCEREUIREtlENTS4.4.1.3.1Therequiredresidualheatremovalloop(s)shallbedeterminedOPERABLEperSpecification4.0.5.4.4.1.3.2Therequiredreactorcoolantpump(s),ifnotinoperation,shallbedeterminedtobeOPERABLEonceper7daysbyverifyingcorrectbreakeralignmentsandindicatedpoweravailability.4.4.1.3.3Therequiredsteamgenerator(s)shallbedeterminedOPERABLEbyverifyingsecondarysideleveltobegreaterthanorequalto255ofwiderangeinstrumentspanatleastonceper12hours.4.4.1.3.4Atleastonecoolantloopshallbeverifiedtobeinop'erationandcirculatingreactorcoolantatleastonceper12hours.D.C,COOK-UNIT23/44-3a REFUELINGOPERATIONS.3/4.9.8RESIDUALHEATREHOYALANDCOOLANTCIRCULATIONLIt'IITI<<GCONDITIONFOROPERATION3.9.8.1Atleastoneresidualheatremovalloopshallbeinoperation.APPLIABILITY:YiODE6.ACTION:a.b.C.<lithlessthanoneresidualheatremovalloopinoperation,exceptasprovidedinb,below,suspendalloperationsinvolvinganinc~easeinthereactordecayheatloadorareductioninboronconcntrationoftheReactorCoolantSystem.Closeallcontainmntpenetrationsprovidirgdirectaccessfromthecontain:~;entatmospheretotheoutsideatmospherewithin4hours.Theresidualheatremovalloopmayberemovedfromoperationforupto1hourper8hour.periodduringtheperformanceofCOREALTERATIONSinthevicinityofthereactorpressurevesselhotlegs.TheprovisionsofSpecification3.0..3arenotapplicable.SUR".EILANCEREQUIREi'iENTS4.9.8.1Aresidualheatremovalloopshallbedeterm',nedtobeinoperationandcirculatingreactorcoolantataflowrateof>3000gpmatleastonceper24hours.0.C.COO">NIT23/49-8

'REFUELINGOPERATIONSLOll<IATERLEi/ELLIMITINGCONDITIONFOROPERATION3.9.8.2TwoindependentResidualHeatRemoval(RHR)loopsshallbeOPERABLE.+APPLICABILITY:NODE6whenthewaterlevelabovethetopofthereactorpressurevesselflangeislessthan23feetwiththeupperinternalsremoved.ACTION:a.>lithlessthantherequiredRHRloopsOPERABLE,immediatelyinitiatecorrectiveactiontoreturntherequiredRHRloopstoOPERABLEstatusassoonaspossible.b.TheprovisionsofSpecification3.0.3arenotapplicable.SURYEILLANCEREUIREjlENTS4.9.8.2TherequiredResidualHeatRemovalloopsshall-bedeterminedOPERABLEperSpecification4.0,5.*ThenormaloremergencypowersourcemaybeinoperableforeachRHRloop.D.C.COOK-UNIT23/49-8a REFUELINGOPERATIONS3/4.9.10MATERLEVEL-REACTORVESSELLIMITINGCONDITIONFOROPERATION~~~3.9.10Atleast23feetofwater.shallbemaintainedoverthetopofthereactorpressurevesselflange.APPLICABILITY:Duringmovementoffuelassembliesorcontrolrodswithinthe,reactorpressurevesselwhileinMODE6withtheupperinternalsremoved.ACTION:kiththerequirementsoftheabovespecificationnotsatisfied,suspendalloperationsinvolvingmovementoffuelassembliesorcontrolrodswithinthepressurevessel.TheprovisionsofSpecification3.0.3arenotapplicable.SURVEILLANCEREUIREHENTS4.9.10Thewaterlevelshallbedeterminedtobeatleastitsminimumrequireddepthwithin2hourspriortothestartofandatleastonceper24hoursthereafterduringmovementoffuelassembliesorcontrolrods.D.C.COOK-UNIT23/49-10 3/4.4REACTORCOOLANTSY"1BASES3/4.4.1REACTORCOOLANTLOOPSANDCOOLANTCIRCULATIONTheplantisdesignedtooperatewithallreactorcoolant1oopsinoperation,andmaintainDNBRabove1.30duringallnormaloperationsandanticipatedtransients.InMODES1and2withonereactorcoolantloopnotinoperationthisspecificationrequiresthattheplantbeinaileastHOTSTAJ.DBYwithinIhour.InMODE3,asinglereactorcoolant1oopprovidessufficientheatremovalcapabilityforremovingdecayheat;however,singlefailureconstrationsrequirethattwoloopsbeOPERABLE.InMODES4and5,asinglereactorcoolantlooporRHRloopprovidessufficientheatremovalcapabilityforremovingdecayheat,;butsinglefailureconsiderationsrequirethatatleasttwoloopsbeOPERABLE.ThusifthereactorcoolantloopsarenotOPERABLE,ihisspecificationrequirestwoRHRloopstobeOPERABLE.TheoperationofoneReactorCoolantPumporoneRHRpumpprovidesadequa.eflowtoensuremixing,preventstratificationandproducegradua1reactivitychangesduringboronconcentrationreductionsintheReactorCoolantSystem..hereactivitychangerateassociaiedwithboronrductionwill,therefore,bewithinthecapabilityofoperatorrecognitionandcontrol.TherestrictionsonstartingaReactorCoolantPumpwith.oneormoreRCScoldlegsl.essthanorequalto152OFareprovidedtopreventRCSpressuretransients,-causedbyenergyadditionsfromthesecondssystem,whichcouldexceedthelimitsofAppendixGto10CFRPart50.TheRCSwillbeproiectedagainstoverpressureiransientsandwillnotexceed=helimiiso7AppendixGbyeither(1)restrictingthewatervolumeinthepressurizerandtherebyprovidingavolumefortheprimarycoolanttoexpandinto.or(2)byrestrictingstartingofthePCPstowhenthesecondarywatert~ratureofeachsteamgeneratorislessthan50ofaboveeachoftheRCScoldlegtemperatures.D.C.Cook-Unit2B3/44-1 3/4.4REACTORCOOLANTSYSTEMBASES3/4.4.2and3/4.4.3SAFETYVALVESThepressurizercodesafetyvalvesoperatetopreventtheRCSfrombeingpressurizedaboveitsSafetyLimitof2735psig.Eachsafetyvalveisdesignedtorelieve420,000lbsperhourofsaturatedsteamatthevalvesetpoint..Thereliefcapacityofasinglesafetyvalveisadequatetorelieveanyoverpressureconditionwhichcouldoccurduringshutdown.IntheeventthatnosafetyvalvesareOPERABLE,anoperatingRHRloop,connectedtotheRCS,providesoverpressurereliefcapabilityandwillpreventRCSoverpressurization.Duringoperation,allpressurizercodesafetyvalvesmustbeOPERABLEtopreventtheRCSfrombeingpressurizedaboveitssafetylimitof2735psig.ThecombinedreliefcapacityofallofthesevalvesisgreaterthanthemaximumsurgerateresultingfromacompletelossofloadassumingnoreactortripuntilthefirstReactorProtectiveSystemtripsetpointisreached(i.e.,nocreditistakenforadirectreactortriponthelossofload)andalsoassumingnooperationofthepoweroperatedreliefvalvesorsteamdumpvalves.D.C.COOK-UNIT2B3/44-la REFUELINGOPERATIONSBASES3/4.9.6MANIPULATORCRANEOPERABILITYTheOPERABILITYrequirementsforthemanipulatorcranesensurethat:1)manipulatorcraneswillbeusedformovementofcontrolrodsandfuel.assemblies,2)eachcranehassufficientloadcapacitytoliftacontrolrodorfuelassembly,and3)thecoreinternalsandpressurevesselareprotectedfromexcessiveliftingforceintheeventtheyareinadvertentlyengagedduringliftingoperations.3/4.9.7CRANETRAVEL-SPENTFUELSTORAGEBUILDINGTherestrictiononmovementofloadsinexcessofthenominalweightofafuelandcontrolrodassemblyandassociatedhandlingtooloverotherfuelassembliesinthestoragepoolensuresthatintheeventthisloadisdropped1)theactivityreleasewillbelimitedtothatcontainedinasinglefuelassembly,and2)anypossibledistortionoffuelinthestoragerockswillnotresultinacriticalarray.Thisassumptionisconsistentwiththeactivityreleaseassumedintheaccidentanalyses.3/4.9.8RESIDUALHEATREMOVALANDCOOLANTCIRCULATIONTherequirementthatatleastoneresidualheatremoval(RHR)loopbeinoperationensuresthat(1)sufficientcoolingcapacityisavailabletoremovedecayheatandmaintainthewaterinthereactorpressurevesselbelow140oFasrequiredduringtheREFUELINGMODE,and{2)sufficientcoolantcir-culationismaintainedthroughthereactorcoretominimizetheeffectofaborondilutionincidentandpreventboronstratification.TherequirementtohavetwoRHRloopsOPERABLEwhenthereislessthan23feetofwaterabovethereactorpressurevesselflangeensuresthatasinglefailureoftheoperatingRHRloopwillnotresultinacompletelossofresidualheatremovalcapability.Withthereactorvesselheadremovedand23feetofwaterabovethereactorpressurevesselflange,alargeheatsinkisavailableforcorecooling.Thus,intheeventofafailureoftheoperatingRHRloop,adequatetimeisprovidedtoinitiateemergencyproce-durestocoolthecore.D.C.COOK-UNIT2B3/49-2 REFUELINGOPERATIONSBASES3/4.9.9"ONTAINMENTPURGEANDXHAUSTISOLATIONSYSTEMTheOPERABILITYofthissystemensuresthatthecontainmentventandpurgepenetrationswillbeautomaticallyisolatedupondetectionofhighradiationlevelswithinthecontainment.TheOPERABILITYofthissystemisrequiredtorestrictthereleaseofradioactivematerialfromthecontainmentatmospheretotheenvironment.3/4.9.10and3/4.9.11MATERLEVEL-REACTORVESSELANDSTORAGEPOOLTherestrictionsonminimumwaterlevelensurethatsufficientwaterdepthisavailabletoremove99%oftheassumed10%iodinegapactivityreleasedfromtheruptureofanirradiatedfuelassemble.Theminimumwaterdepthisconsistentwiththeassumptionsoftheaccidentanalysis.3/4.9.12STORAGEPOOLVENTILATIONSYSTEMThelimitationsonthestoragepoolventilationsystemensurethatallradioactivemaerialreleasedfromanirradiatedfuelassemblywillbefilteredthroughtheHEPAfiltersandcharcoaladsorberpriortodis-chargetotheatmosphere.TheOPERABILITYofthissystemandtheresult-ingiodineremovalcapacityareconsistentwiththeassumptionsoftheaccidentanalyses.3/4.9.13SPENTFUELCASKMOVEMENTThelimitationsofthisspecificationensuresthat,duringin-sertionorremovalofspentfuelcasksfromthespentfuelpool,fuelcaskmovementwillbeconstrainedtothepathandliftheightassumedintheCaskDropProtectionSystemsafetyanalysis.Restrict-ingthespentfuelcaskmovementwithinthese,requirementsprovidesprotectionforthespentfuelpoolandstoredfuelfromtheeffectsofafuelcaskdropaccident.3/4.9.14SPENTFUELCASKDROPPROTECTIONSYSTEMThelimitationsontheuseofspentfuelcasksweighinginexcessof110tons(nominal)providesassurancethatthespentfuelpoolwouldnotbedamagedbyadroppedfuelcasksincethisweightisconsistentwiththeassumptionsusedinthesafetyanalysisfortheperformanceoftheCaskDropProtectio.sSystem.D.C.COOK.-UNIT2B3/49-3