ML17331A783
| ML17331A783 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 08/14/1981 |
| From: | INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | |
| Shared Package | |
| ML17331A782 | List: |
| References | |
| NUDOCS 8108250265 | |
| Download: ML17331A783 (23) | |
Text
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REACTORCOOLANTSYSTEMSHUTDOWNLiMITINGCONDITION FOROPERATiON 3.4.1.3a.Atleasttwoo<thecoolantloopslistedbelowshallbeOPERABLE:
1.ReactorCoolantLoop1anditsassociated steamgenerator andreactorcoolantpump,*2.ReactorCoolantLoop2anditsassociated steamgenerator andreactorcoolantpump,*3.ReactorCo'olantLoop3anditsassociated steamgenerator andreactorcoolantpump,*4.ReactorCoolantLoop4andi.tsassociated steamgenerator andreactorcoolantpump,*5.ResidualHeatRemoval-East,**6.ResidualHeatRemoval.-Hest,**b.Atleastoneoftheabovecoolantloopsshallbeinoperation.***
APPLICABILITY:
MODES4and5ACTION:a.WithlessthantheaboverequiredloopsOPERABLE, immediately initiatecorrective actiontoreturntherequiredloopstoOPERABLEstatusassoonaspossible; beinCOLDSHUTDOWNwith-in20hours.b.Withnocoolant'locp in.operation, suspendalloperations in-volvingareduction inboronconcentration oftheReactorCool-'nt'ystem andimmediately initiatecorrective actiontoreturntherequiredcoolantlooptooperation.
+AreactorcoolantpumpshallnotbestartedwithoneormoreoftheRCScoldlegtemperatures lessthanorequalto188oFunless1)thepressurizer watervolumeislessthan52.00%ofspanor2)thesecondary watertemperature ofeachsteamgenerator islessthan50oFaboveeachoftheRCScoldlegtemper-atures.Operability ofareactorcoolantloop(s)doesnotrequireanOPERABLEauxiliary feedwater system.**Thenormaloremergency powersourcemaybeinoperable inMODE5.***Allreactorcoolantpumpsandresidualheatremovalpumpsmaybede-energized forupto1hourprovided1)nooperations arepermitted thatwouldcausedilutionofthereactorcoolantsystemboronconcentration, and2)coreout-lettemperature ismaintained atleast10oFbelowsaturation temperature.
D.C.Cook-Unit13/44-3 REACTORCOOLANTSYSTEMSURYEILLANCE REUIREMENTS 4.4.1.3.1Therequiredresidualheatremovalloop(s)shallbedetermined OPERABLEperSpecification 4.0.5.4.4.1.3.2 Therequiredreactorcoolantpump(s),ifnotinoperation, shallbedetermined tobeOPERABLEonceper7daysbyverifying correctbreakeralignments andindicated poweravailability.
4.4.1.3.3 Therequiredsteamgenerator(s) shallbedetermined OPERABLEbyverifying secondary sideleveltobegreaterthanorequalto25>ofwiderangeinstrument spanatleastonceper12hours.4.4.1.3.4 Atleastonecoolantloopshallbeverifiedtobeinoperation andcirculating reactorcoolantatleastonceper12hours.g,lr1~ID.C.COOK-UNIT13/44-3a REFUELING OPERATIONS 3/4.9.8RESIDUALHEATREMOVALANDCOOLANTCIRCULATION LIMITINGCONDITION FOROPERATION 3.9.8.1Atleastoneresidualheatremovalloopshallbeinoperation.
APPLICABILITY:
MODE6.ACTION:a.Withlessthanoneresidualheatremovalloopinoperation, exceptasprovidedinb.below,suspendalloperations involving anincreaseinthereactordecayheatloadorareduction inboronconcentration oftheReactorCoolantSystem.Closeallcontainment penetrations providing directaccessfromthecontainment atmosphere totheoutsideatmosphere within4hours.b.Theresidualheatremovalloopmayberemovedfromoperation forupto1hourper8hourperiodduringtheperformance ofCOREALTERATIONS inthevicinityofthereactorpressurevesselhotlegs.c.Theprovisions ofSpecification 3.0..3arenotapplicable.
SURVEILLANCE REQUIREi~lENTS 4~~4.9.8.1Aresidualheatremovalloopshallbedetermined tobeinoperation andcirculating reactorcoolanataflowrateof>3000gpmatleastonceper24hours.D.C.COOK-UNIT13j49-9 REFUELING OPERATIONS LOWWATERLEVELLIMITINGCONOITION FOROPERATION 3.9.8.2Twoindependent ResidualHeatRemoval(RHR)loopsshallbeOPERABLE.*
APPLICABILITY:
MOOE6whenthewaterlevelabovethetopofthereactorpressurevesselflangeislessthan23feetwiththeupperinternals removed.ACTION:a.WithlessthantherequiredRHRloopsOPERABLE, immediately initiatecorrective actiontoreturntherequiredRHRloopstoOPERABLEstatusassoonaspossible.
b.Theprovisions ofSpecification 3.0.3arenotapplicable.
SURVEILLANCE REUIREMENTS 4.9.8.2TherequiredResidualHeatRemovalloopsshallbedetermined OPERABLEperSpecification 4.0.5.*Thenormaloremergency powersourcemaybeinoperable foreachRHRloop.D.C.COOK-UNIT13/49-9a REFUELING OPERATIONS 3/4.9.10MATERLEYEL-REACTORYESSELLIHITIHGCOHDITIOH FOROPERATION 3.9.10Atleast23feetofwater,shallbemaintained overthetopofthereactorpressurevesselflange.APPLICABILITY:
Duringmovementoffuelassemblies orcontrolrodswithinthereactorpressurevesselwhileinMODE6.withtheupperinternals removed.ACTION:Miththerequirements oftheabovespecification notsatisfied, suspendalloperations involving movementoffuelassemblies orcontrolrodswithinthepressurevessel.Theprovisions ofSpecification 3.0.3arenotapplicable.
SURVEILLANCE REUIREHEHTS 4.9.10Thewaterlevelsha')1bedetermined tobeat,leastitsminimum"required depthwithin2hourspriortothestartofandatleastonceper24hoursthereafter duringmovementoffuelassemblies orcontrolrods.~~D.C.Cook-Unit13/49-11 3/4.4REACTORCOOLANTSY<BASES3/4.4.1REACTORCOOLANTLOOPSANDCOOLANTCIRCULATION Theplantisdesignedtooperatewithallreactorcoolantloopsinoperation, andmaintainONBRabove1.30duringallnormaloperations andanticipated transients.
Inl100ES1and2withonereactorcoolantloopnotinoperation thisspecification requiresthatt'eplantbei.natleastHOTSTN'DBYwithin1hour.InNODE3,'singlereactorcoolantloopprovidessufficient heatremovalcapability forremovingdecayheat;however,singlefailurecons~rationsrequirethattwoloopsbeOPERABLE.
Int<ODES4and5,asinglereactorcoolantlooporRHRloopprovidessufficient heatremovalcapability forremovingdecayheat;butsinglefailureconsiderations requirethatatleasttwoloopsbeOPERABLE.
ThusifthereactorcoolantloopsarenotOPERABLE, thisspecification requirestwoRHRloopstobeOPERABLE.
Theoperation ofoneReactorCoolantPumporoneRHRpumpprovidesadequateflowtoensuremixing;preventstratification andproducegradualreactivity changesduringboronconcentration reductions intheReactorCoolantSystem.Thereactivity chanoerateassociated withboronreduction will,therefore, bewithinthecapability ofoperatorrecognition andcontrol.Therestrictions onstartingaReactorCoolantPumpwithoneormoreRCScoldlegsl,essthanorequalto188FareprovidedtopreventRCSpress~retransients,-
causedbyenergyadditions fromthesecondlysystem,whichcouldexcedthelimitsofAppendixGto10CFRPart50.TheRCSwillbeprotected againstoverpressure transients andwillnotexceedhelimitsofAppendixGbyeither(1)restricting thewatervolumeinthepressurizer andtherebyproviding avolumefortheprimarycoolanttoexpandinto,or(2)byrestricting startingoftheRCPstowhenthesecondary watertrapratureofeachsteamgenerator islessthan50FaboveeachoftheRCScoldlegtemperatures.0.C.Cook-Unit183/44-1 3/4.4REACTORCOOLANTSYSTe.l8ASES3/4.4.2and3/<.4.3SAFETYVAL'/ESThepressurizer codesafetyvalvesoperatetopreventtheRCSfrombeingpressurized aboveitsSafetyLimitof2735psia.Eachsaetyvalveisdesignedtorelieve420,000lbsperhourofsaturated steamatthevalvesetpoint.Thereliefcapacityofasinglesafetyvalveisadeauatetorelieveanyoveroressure condition uhichcouldoccurduringshutdown.
IntheeventthatnosafetyvalvesareOPERABLE, anooerating RHRlooo,connected totheRCS,providesoverpressure reliefcapability andwillpteventRCSoverpressurization.
Ouringoperation, a11pressurizer codesafetyvalvesmustbeOPERA8LEtopreventtheRCSfrombeingoressurized aboveitssafetyIimitof2735psig.Thecombinedreliefcapacityofallofthesevalvesisgreaterthanthemaximumsurgeraterosultina fromacomoletelossofloadassumingnoreactortripuntilthefirs~ReactorProtective Systemtripsetpoint:sreached(i.e.,nocreditistaken,oradirectroactortriponthelossorload)andalsoassuminanoooeration afthepoweroperaedreliefvalves.orsteamdumpvalves.Oemonstration ofthe'afety valves'i, tsettinasui11occuronlyduringshudownandwillbeperformed inaccordance uiththe"rovisicns ofSectionXIoftheASl1EBoilerandPressureCode,1974Edition.0.C.COOK-Ui'(IT I83/44-Ia REFUELING OPERATIONS BASES3/4.9.6MANIPULATOR CRANEOPERABILITY TheOPERABILITY requirements forthemanipulator cranesensurethat:1)manipulator craneswillbeusedformovementofcontrolrodsandfuelassemblies 2)eachcranehassufficient loadcapacitytoliftacontrolrodorfuelassemblyand3)thecoreinternals andpressurevesselareprotected fromexcessive liftingforceintheeventtheyareinadvertently engageddur-ingliftiingoperations.
'I3/4.9.7CRANETRAVEL-SPENTFUELSTORAGEBUILDINGTherestriction onmovementofloadsinexcessofthenominalweightofafuelassemblyoverotherfuelassemblies ensuresthatnomorethanthecontentsofonefuelassemblywillberupturedintheeventofafuelhandlingaccident.
Thisassumption isconsistent withtheactivityreleaseassumedintheaccidentanalyses.
3/4.9.8RESIDUALHEATREMOVALANDCOOLANTCIRCULATION Therequirementthat atleastoneresidualheatremoval(RHR)loopbeinoperation ensuresthat(1)sufficient coolingcapacityisavailable toremovedecayheatandmaintainthewaterinthereactorpressurevesselbelow140oFasrequiredduringtheREFUELING MODE,and(2)sufficient coolantcirculation ismaintained throughthereactorcoretominimizetheeffectofaborondilutionincidentandpreventboronstratification.
Therequirement tohavetwoRHRloopsOPERABLEwhenthereislessthan23feetofwaterabovethereactorpressurevesselflangeensuresthatasinglefailureoftheoperating RHRloopwillnotresultinacompletelossofresidualheatremovalcapability.
Withthereactorvesselheadremovedand23feetofwaterabovethereactorpressurevesselflange,alargeheatsinkisavailable forcorecooling.Thus,intheeventofafailureoftheoperating RHRloop,adequatetimeisprovidedtoinitiateemergency procedures tocoolthecore.3/4.9.9CONTAINMENT PURGEANDEXHAUSTISOLATION SYSTEMTheOPERABILITY ofthissystemensuresthatthecontainment ventandpurgepenetrations willbeautomatically isolatedupondetection ofhighradiation levelswithinthecontainment.
TheOPERABILITY ofthissystemisrequiredtorestrictthereleaseofradioactive materialfromthecontain-mentatmosphere totheenvironment.
D.C.COOK-UNIT 1B3/49-3 REFUELING OPERATIONS BASES3/4.9.10and3/4.9.11lriATERLEVEL-REACTORVESSELANDSTORAGEPOOLTherestrictions onminimumwaterlevelensurethatsufficient waterdepthisavailable toremove99KoftheassumedlOXiodinegapactivityreleasedfrom.theruptureofanirradiated fuelassembly.
Theminimumwaterdepthisconsistent withtheassumptions oftheaccidentanalysis.
3/4.9.12STORAGEPOOLVENTILATION SYSTEMThelimitations onthestoragepoolventilation systemensurethatallradioactive materialreleasedfromanirradiated fuelassembly'will befilteredthroughtheHEPAfiltersandcharcoaladsorberpriortodischarge totheatmosphere.
TheOPERABILITY ofthissystemandtheresulting iodineremovalcapacityareconsistent withtheassumptions oftheaccidentanalyses.
3/4.9.13SPENTFUELCASKMOVEMENTThelimitations ofthisspecification ensuresthat,duringin-sertionorremovalofspentfuelcasksfromthespentfuelpool,fuelcaskmovementwillbeconstrained tothepathandliftheightassumedintheCaskDropProtection Systemsafetyanalysis.
Restrict-ingthespentfuelcaskmovementwithintheserequirements providesprotection forthespentfuelpoolandstoredfuelfromtheeffectsofafuelcaskdropaccident.
3/4.9.14SPENTFUELCASKDROPPROTECTION SYSTEMThelimitations ontheuseofspentfuelcasksweighinginexcessof110tons(nominal)
-provides assurance thatthespentfuelpoolwouldnotbedamagedbyadroppedfuelcasksincethisweightisconsistent withtheassumptions usedinthesafetyanalysisfortheperformance oftheCaskDropProtection System.D.C.COOK-UNIT 1IB3/49-4 Attachment No.3toAEP:NRC:00420A DonaldC.CookNuclearPlantUnitNos.1and2DecayHeatRemovalTechnical Specifications
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REACTOR'".GOLANT SYSTEMSHUTDOWNLIMITINGCONDITION FOROPERATION 3.4.1.3a.AtleasttwoofthecoolantloopslistedbelowshallJ1.ReactorCoolantLoop1anditsassociated steamreactorcoolantpump,*beOPERABLE:
generator and2.ReactorCoolantLoop2anditsassociated steamgenerator andreactorcoolantpump,*3.ReactorCoolantLoop'anditsassociated steamgenerator andreactorcoolantpump,*4.ReactorCoolantLoop4anditsassociated steamgenerator andreactorcoolantpump,*5.ResidualHeatRemoval-East,**6.ResidualHeatRemoval-West"'.Atleastoneoftheabovecoolantloopsshallbeinoperation.**"
APPLICABILITY:
MODES4and5ACTION:a.Withlessthantheaboverequired, loopsOPERABLE, immediately initiatecorrective actiontoreturntherequiredloopstoOPERABLEstatusassoonaspossible; beinCOL'DSHUTDOWNwith-in20hours.b.Withnocoolantloopinoperation, suspendalloperatiors in-volvingareduction inboronconcentration oftheReactorCool-antSystemandimmediately initiatecorrective actiontoreturntherequiredcoolantlooptooperation.'A reactorcoolantpumpshallnotbestartedwithoneormoreoftheRCSco!dlegtemperatures lessthanorequalto152oFunless1)thepressu~izer watervolumeislessthan62.00Kofspanor2)thesecondary watertemperature ofeachsteamgenerator islessthan50FaboveeachoftheRCScoldlegtemper-atures.Operability ofareactorcoolantloop(s)doesnotrequireanOPERABLEauxiliary feedwater system.**Thenormaloremergency powersourcemaybeinoperable inMODE5.-""Allreactorcoolantpumpsandresidualheatremovalpumpsmaybede-energized foruoto1hourprovided1)nooperations arepermitted thatwouldcausedilutionofthereactorcoolantsystemboronconcentration, and2)coreout-lettemperature ismaintained atleast10oFbelowsaturation tempera;ure.
D.C.Cook-Unit23/44-3 REACTORCOOLANTSYSTEMSURVEILLANCE REUIREtlENTS 4.4.1.3.1 Therequiredresidualheatremovalloop(s)shallbedetermined OPERABLEperSpecification 4.0.5.4.4.1.3.2 Therequiredreactorcoolantpump(s),ifnotinoperation, shallbedetermined tobeOPERABLEonceper7daysbyverifying correctbreakeralignments andindicated poweravailability.
4.4.1.3.3 Therequiredsteamgenerator(s) shallbedetermined OPERABLEbyverifying secondary sideleveltobegreaterthanorequalto255ofwiderangeinstrument spanatleastonceper12hours.4.4.1.3.4Atleastonecoolantloopshallbeverifiedtobeinop'eration andcirculating reactorcoolantatleastonceper12hours.D.C,COOK-UNIT23/44-3a REFUELING OPERATIONS
.3/4.9.8RESIDUALHEATREHOYALANDCOOLANTCIRCULATION LIt'IITI<<G CONDITION FOROPERATION 3.9.8.1Atleastoneresidualheatremovalloopshallbeinoperation.
APPLIABILITY:YiODE6.ACTION:a.b.C.<lithlessthanoneresidualheatremovalloopinoperation, exceptasprovidedinb,below,suspendalloperations involving aninc~easeinthereactordecayheatloadorareduction inboronconcntrationoftheReactorCoolantSystem.Closeallcontainmntpenetrations providirg directaccessfromthecontain:~;ent atmosphere totheoutsideatmosphere within4hours.Theresidualheatremovalloopmayberemovedfromoperation forupto1hourper8hour.periodduringtheperformance ofCOREALTERATIONS inthevicinityofthereactorpressurevesselhotlegs.Theprovisions ofSpecification 3.0..3arenotapplicable.
SUR".EILANCEREQUIREi'iENTS 4.9.8.1Aresidualheatremovalloopshallbedeterm',ned tobeinoperation andcirculating reactorcoolantataflowrateof>3000gpmatleastonceper24hours.0.C.COO">NIT23/49-8
'REFUELING OPERATIONS LOll<IATERLEi/ELLIMITINGCONDITION FOROPERATION 3.9.8.2Twoindependent ResidualHeatRemoval(RHR)loopsshallbeOPERABLE.+
APPLICABILITY:
NODE6whenthewaterlevelabovethetopofthereactorpressurevesselflangeislessthan23feetwiththeupperinternals removed.ACTION:a.>lithlessthantherequiredRHRloopsOPERABLE, immediately initiatecorrective actiontoreturntherequiredRHRloopstoOPERABLEstatusassoonaspossible.
b.Theprovisions ofSpecification 3.0.3arenotapplicable.
SURYEILLANCEREUIREjlENTS 4.9.8.2TherequiredResidualHeatRemovalloopsshall-bedetermined OPERABLEperSpecification 4.0,5.*Thenormaloremergency powersourcemaybeinoperable foreachRHRloop.D.C.COOK-UNIT23/49-8a REFUELING OPERATIONS 3/4.9.10MATERLEVEL-REACTORVESSELLIMITINGCONDITION FOROPERATION
~~~3.9.10Atleast23feetofwater.shallbemaintained overthetopofthereactorpressurevesselflange.APPLICABILITY:
Duringmovementoffuelassemblies orcontrolrodswithinthe,reactorpressurevesselwhileinMODE6withtheupperinternals removed.ACTION:kiththerequirements oftheabovespecification notsatisfied, suspendalloperations involving movementoffuelassemblies orcontrolrodswithinthepressurevessel.Theprovisions ofSpecification 3.0.3arenotapplicable.
SURVEILLANCE REUIREHENTS 4.9.10Thewaterlevelshallbedetermined tobeatleastitsminimumrequireddepthwithin2hourspriortothestartofandatleastonceper24hoursthereafter duringmovementoffuelassemblies orcontrolrods.D.C.COOK-UNIT23/49-10 3/4.4REACTORCOOLANTSY"1BASES3/4.4.1REACTORCOOLANTLOOPSANDCOOLANTCIRCULATION Theplantisdesignedtooperatewithallreactorcoolant1oopsinoperation, andmaintainDNBRabove1.30duringallnormaloperations andanticipated transients.
InMODES1and2withonereactorcoolantloopnotinoperation thisspecification requiresthattheplantbeinaileastHOTSTAJ.DBYwithinIhour.InMODE3,asinglereactorcoolant1oopprovidessufficient heatremovalcapability forremovingdecayheat;however,singlefailureconstrationsrequirethattwoloopsbeOPERABLE.
InMODES4and5,asinglereactorcoolantlooporRHRloopprovidessufficient heatremovalcapability forremovingdecayheat,;butsinglefailureconsiderations requirethatatleasttwoloopsbeOPERABLE.
ThusifthereactorcoolantloopsarenotOPERABLE, ihisspecification requirestwoRHRloopstobeOPERABLE.
Theoperation ofoneReactorCoolantPumporoneRHRpumpprovidesadequa.eflowtoensuremixing,preventstratification andproducegradua1reactivity changesduringboronconcentration reductions intheReactorCoolantSystem..hereactivity changerateassociaiedwithboronrductionwill,therefore, bewithinthecapability ofoperatorrecognition andcontrol.Therestrictions onstartingaReactorCoolantPumpwith.oneormoreRCScoldlegsl.essthanorequalto152OFareprovidedtopreventRCSpressuretransients,-
causedbyenergyadditions fromthesecondssystem,whichcouldexceedthelimitsofAppendixGto10CFRPart50.TheRCSwillbeproiected againstoverpressure iransients andwillnotexceed=helimiiso7AppendixGbyeither(1)restricting thewatervolumeinthepressurizer andtherebyproviding avolumefortheprimarycoolanttoexpandinto.or(2)byrestricting startingofthePCPstowhenthesecondary watert~rature ofeachsteamgenerator islessthan50ofaboveeachoftheRCScoldlegtemperatures.D.C.Cook-Unit2B3/44-1 3/4.4REACTORCOOLANTSYSTEMBASES3/4.4.2and3/4.4.3SAFETYVALVESThepressurizer codesafetyvalvesoperatetopreventtheRCSfrombeingpressurized aboveitsSafetyLimitof2735psig.Eachsafetyvalveisdesignedtorelieve420,000lbsperhourofsaturated steamatthevalvesetpoint..Thereliefcapacityofasinglesafetyvalveisadequatetorelieveanyoverpressure condition whichcouldoccurduringshutdown.
IntheeventthatnosafetyvalvesareOPERABLE, anoperating RHRloop,connected totheRCS,providesoverpressure reliefcapability andwillpreventRCSoverpressurization.
Duringoperation, allpressurizer codesafetyvalvesmustbeOPERABLEtopreventtheRCSfrombeingpressurized aboveitssafetylimitof2735psig.Thecombinedreliefcapacityofallofthesevalvesisgreaterthanthemaximumsurgerateresulting fromacompletelossofloadassumingnoreactortripuntilthefirstReactorProtective Systemtripsetpointisreached(i.e.,nocreditistakenforadirectreactortriponthelossofload)andalsoassumingnooperation ofthepoweroperatedreliefvalvesorsteamdumpvalves.D.C.COOK-UNIT2B3/44-la REFUELING OPERATIONS BASES3/4.9.6MANIPULATOR CRANEOPERABILITY TheOPERABILITY requirements forthemanipulator cranesensurethat:1)manipulator craneswillbeusedformovementofcontrolrodsandfuel.assemblies, 2)eachcranehassufficient loadcapacitytoliftacontrolrodorfuelassembly, and3)thecoreinternals andpressurevesselareprotected fromexcessive liftingforceintheeventtheyareinadvertently engagedduringliftingoperations.
3/4.9.7CRANETRAVEL-SPENTFUELSTORAGEBUILDINGTherestriction onmovementofloadsinexcessofthenominalweightofafuelandcontrolrodassemblyandassociated handlingtooloverotherfuelassemblies inthestoragepoolensuresthatintheeventthisloadisdropped1)theactivityreleasewillbelimitedtothatcontained inasinglefuelassembly, and2)anypossibledistortion offuelinthestoragerockswillnotresultinacriticalarray.Thisassumption isconsistent withtheactivityreleaseassumedintheaccidentanalyses.
3/4.9.8RESIDUALHEATREMOVALANDCOOLANTCIRCULATION Therequirement thatatleastoneresidualheatremoval(RHR)loopbeinoperation ensuresthat(1)sufficient coolingcapacityisavailable toremovedecayheatandmaintainthewaterinthereactorpressurevesselbelow140oFasrequiredduringtheREFUELING MODE,and{2)sufficient coolantcir-culationismaintained throughthereactorcoretominimizetheeffectofaborondilutionincidentandpreventboronstratification.
Therequirement tohavetwoRHRloopsOPERABLEwhenthereislessthan23feetofwaterabovethereactorpressurevesselflangeensuresthatasinglefailureoftheoperating RHRloopwillnotresultinacompletelossofresidualheatremovalcapability.
Withthereactorvesselheadremovedand23feetofwaterabovethereactorpressurevesselflange,alargeheatsinkisavailable forcorecooling.Thus,intheeventofafailureoftheoperating RHRloop,adequatetimeisprovidedtoinitiateemergency proce-durestocoolthecore.D.C.COOK-UNIT2B3/49-2 REFUELING OPERATIONS BASES3/4.9.9"ONTAINMENT PURGEANDXHAUSTISOLATION SYSTEMTheOPERABILITY ofthissystemensuresthatthecontainment ventandpurgepenetrations willbeautomatically isolatedupondetection ofhighradiation levelswithinthecontainment.
TheOPERABILITY ofthissystemisrequiredtorestrictthereleaseofradioactive materialfromthecontainment atmosphere totheenvironment.
3/4.9.10and3/4.9.11MATERLEVEL-REACTORVESSELANDSTORAGEPOOLTherestrictions onminimumwaterlevelensurethatsufficient waterdepthisavailable toremove99%oftheassumed10%iodinegapactivityreleasedfromtheruptureofanirradiated fuelassemble.
Theminimumwaterdepthisconsistent withtheassumptions oftheaccidentanalysis.
3/4.9.12STORAGEPOOLVENTILATION SYSTEMThelimitations onthestoragepoolventilation systemensurethatallradioactive maerialreleasedfromanirradiated fuelassemblywillbefilteredthroughtheHEPAfiltersandcharcoaladsorberpriortodis-chargetotheatmosphere.
TheOPERABILITY ofthissystemandtheresult-ingiodineremovalcapacityareconsistent withtheassumptions oftheaccidentanalyses.
3/4.9.13SPENTFUELCASKMOVEMENTThelimitations ofthisspecification ensuresthat,duringin-sertionorremovalofspentfuelcasksfromthespentfuelpool,fuelcaskmovementwillbeconstrained tothepathandliftheightassumedintheCaskDropProtection Systemsafetyanalysis.
Restrict-ingthespentfuelcaskmovementwithinthese,requirements providesprotection forthespentfuelpoolandstoredfuelfromtheeffectsofafuelcaskdropaccident.
3/4.9.14SPENTFUELCASKDROPPROTECTION SYSTEMThelimitations ontheuseofspentfuelcasksweighinginexcessof110tons(nominal) providesassurance thatthespentfuelpoolwouldnotbedamagedbyadroppedfuelcasksincethisweightisconsistent withtheassumptions usedinthesafetyanalysisfortheperformance oftheCaskDropProtectio.s System.D.C.COOK.-UNIT2B3/49-3