ML17335A368
| ML17335A368 | |
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| Site: | Cook  |
| Issue date: | 12/03/1998 |
| From: | INDIANA MICHIGAN POWER CO. |
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| NUDOCS 9812080069 | |
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ATTACHMENT2TOAEP:NRC:1291CURRENTPAGESMARKED-UPTOSHOWPROPOSEDAMENDMENTTOTHETECHNICALSPECIFICATIONSDISTRIBUTEDIGNITIONSYSTEM981208006'P981203PDRADOCK050003i5'PDR I
~IINDEX.jLIMITINGCONDITIONSFOROPERATIONANDSURVEILLANCEREUIREMENTSSECTIONPAGE34.53/4.5.13/4.5.23/4.5.33/4.5.43/4.5.5EMERGENCYCORECOOLINGSYSTEMSECCSACCUMULATORSECCSSUBSYSTEHS-Tavggreaterthanoreoto350Fe~~~~~~~~~~~~~~~~~~~~~~~~~~~~ECCSSUBSYSTEMS'Tavglessthan350F..BORONINJECTIONSYSTEMIntentionallyLeftBlankIntencionallyLeftBlankREFUELINGWATERSTORAGETANKSqual3/45-13/45-33/45-73/45-93/45-103/45-1134.6CONTAINMENTSYSTE."fS3/4.6.1PRIMLYCONTAINMENTConcainmentIntegrityContainmentLeakageContainmentAirLocks..InternalPressureAirTemperatureContainmencStructuralIntegrityContai.nmentVenti.lationSystems.3/4.6.2OEPRESSURI2ATIONANDCOOLINGSYSTE."iS3/46-13/46-23/46-43/46-63/46-73/46-93/46-9a3/4.6.33/4.6.4ContainmentSpraySystem.5.ayAdditiveSystem..CONTAINMENTISOLATIONVALVESCOMBUSTIBLEGASCONTROLHydrogenAnalyzersElectricHydrogenRecombiners-W3/46-103/46-123/46-143/46-233/46-24Sird~ia~ma'gni+io~SySA~......S/<COOK'NUCLEARPLANT-UNIT1VIIAMENDMENTNo.gl,SitXN,15S 3.6.4.2TwoindependentcontainmenthydrogenrecombinersystemsshallbeOPERABLE.MODES1and2.*hQXlQE-Vfthonehydrogenrecombfnersyseemfnoperable,reseorecheinoperablesyseemeoOPERABLEstatuswithin30daysorbefnatleastHOTSTANDBYwithfxt'Chenexe6hours.4.6.4.2EachhydrogenrecombfnersyseemshallbedemonstratedOPERABLE:a.Atleastonceper18monthsbyverifyingduringarecombinersystemfunceionaltestthaetheminimumheatersheathtemperatureincreasesto0x700Pwithin90minutesandismaintainedforaelease2hours.b.Aeleaseonceper18monthsby:PerfoxELLGg.aQfhNNEFCALIBRATIONof.allrecombfnerfnsCreaentationand.'conerol"cfrcufts.'erffyfngthroughavfsualeximfnatfonchattherefs.noevfdenceabnormalconditionswithintherecombfners(f.e.,loosewiringorstructural'connections,depositsofforefgnmiterfals,etc.)~~>+<<7~Wzsri~~>Mu~~rcwwmcm,~~4'miiza~aZrSS-Mrna4.wNo~Z/~COOKNUCLFdB.PLANT-UNIT1;j13/46-24'.1AMENDMENTNO.+M.~
3/4LIMITINGCONiDITIONSFOROPERATIONANDSURVEILLANCEREQUIREMENTS3/4.6CONTAINiiIENTSYSTEMSVerifyingduringarccombinersystemfunctionaltestthattheheatersheathtemperatureincreasesto~1200'Fwithin5hoursandismaintainedforatleast4hours.~A//T/r/5Verifyingtheintegrityofallheaterelectricalcircuitsbyperformingacontinuityandresistancetogroundtestfollowingtheaboverequiredfunctionaltest.Theresistancetogroundforanyheaterphaseshallbe210,000ohms.~uuV~raWageQC@urrZEmaurgfH~+ZDISTRIBUTEDIGNITIONSYSTEMLIMITINGCONDITIONFOROPERATION3.6.4.3BothtrainsoftheDistributedIgnitionSystemshallbeOPERABLE.APPLICABILITY:MODES1a11d2.ACTION:WithonetrainoftheDistributedIgnitionSysteminoperable:RestoretheinoperabletraintoOPERABLEstatuswithin7days,orb.Performsurveillancerequirement4.6.4.3aonceper7daysontheOPERABLEtrainuntiltheinoperabletrainisrestoredtoOPERABLEstatus.WithnoOPERABLEhydrogenigniterinonecontainmentregion,restoreonehydrogenigniterintheaffectedcontainmentregiontoOPERABLEstatuswithin7days,orbeinHOTSTANDBYwithin6hours.SURVEILLANCEREUIREMENTS4.6.4.3EachtrainoftheDistributedIgnitionSystemshallbedemonstratedOPERABLE:a.Onceper92daysbyenergizingthesupplybreakersandverifyingthatatleast34of35ignitersareenergized.b.Onceper92days,verifyatleastonehydrogenigniterisOPERABLEineachcontainmentregion.c.Onceper18monthsbyverifyingthetemperatureofeachigniterisaminimum1700'F.COOKNUCLEARPLANT-UMT1Page3/46-25AMENDME223~Pa'Wy'uPscgypgzg 3/4BASES3/4.6COilTAINMENTSYSTEMS3/4.6.2DEPRESSURIZATIONANDCOOLINGSYSTEMS3/4.6.2.1CONTAINMENTSPRAYSYSTEiVITheOPERABILITYofthecontainmentspraysystemensuresthatcontainmentdepressurizationandcoolingcapabilitywillbeavailableintheeventofaLOCA.Thepressurereductionandresultantlowercontainmentleakagerateareconsistentwiththeassumptionsusedintheaccidentanalyses.3/4.6.2.2SPRAYADDITIVESYSTEMTheOPERABILITYofthesprayadditivesystemensuresthatsufficientNaOHisaddedtothecontainmentsprayintheeventofaLOCA.ThelimitsonNaOHminimumvolumeandconcentration,ensurethatI)theiodineremovalefficiencyofthespraywaterismaintainedbecauseoftheincreaseinpHvalue,and2)corrosioneffectsoncomponentswithincontainmentareminimized.Theseassumptionsareconsistentwiththeiodineremovalefficiencyassumedintheaccidentanalyses.3/4.6.3CONTAINMENTISOLATIONVALVESTheOPERABILITYofthecontainmentisolationvalvesensuresthatthecontainmentatmospherewillbeisolatedfromtheoutsideenvironmentintheevent'fareleaseofradioactivematerialtothecontainmentatmosphereorpressurizationofthecontainment.ContainmentisolationwithinthetimelimitsspecifiedensuresthatthereleaseofradioactivematerialtotheenvironmentwillbeconsistentwiththeassumptionsusedintheanalysesforaLOCA.Theopeningofcontainmentpurgeandexhaustvalvesandlocked.sealedclosedcontainmentisolationvalvesonanintermittentbasisunderadministrativecontrolincludesthefollowingconsiderations:(I)stanoningaqualifiedindividual,whoisinconstantcommunicationwithcontrolroom,atthevalvecontrols,(2)instructingthisindividualtoclosethesevalvesinanaccidentsituation,and(3)assuringthatenvironmentalconditionswillnotprecludeaccesstoclosethevalvesandthatthisactionwillpreventthereleaseofradioactivityoutsidethecontainment.3/4.6.4COMBUSTIBLEGASCONTROLTheOPERABILITYoftheequipmentandsystemsrequiredforthedetectionandcontrolofhydrogengasensuresthatthisequipmentwillbeavailabletomaintainthehydrogenconcentrationwithincontainmentbelowitsflammablelimitduringpost-LOCAconditions.Eitherrecombinerunitiscapableofcontrollingtheexpectedhydrogengenerationassociatedwith:I)zirconium-waterreactions;2)radiolyticdecompositionofwater;and3)corrosionofmetalswithincontainment.Theacceptancecriterionof10,000ohmsisbasedonthetestbeingperformedwiththeheaterelementatanambienttemperature,butcanbeconservativelyappliedwhentheelementisatatemperatureaboveambient.+ycYroy<nAnal'drsNrroPMrrrc5inerzPg>N@7fPW~&ayr>uZrow8'Z/4>-SH0COOKNUCLEARPLANT-UNITIPageB3/46-3AMENDMENT48k,~3-DistributedIgnitionSystem(DIS)TheDISpermitscontrolledburningoftheexcessivehydrogengeneratedduringdegradedcoreLOCAspostulatedby10CFR50.44"Standardsforcombustiblegascontrolsysteminlight-water-cooledpowerreactors."Thepostulatedamountofhydrogenisequivalenttothatgeneratedfromthereactionof75%ofthefuelcladdingwithwater.Controlledburningatlowhydrogenconcentrationsprecludescontainmentdamagethatcouldresultfromrandomignitionathighconcentrations.Anextensiveprogramoftestingandanalysishasdemonstratedthatasystemofstrategicallyplacedhydrogenigniters(theDIS)canberelieduponforcontrolledburnsofthehydrogengaspostulatedfordegradedcores.Furthermore,ithasbeenshownthatthiscanbeaccomplishedatcombustiontemperaturesandpressuresthatwillnotchallengetheintegrityofthecontainmentstructureortheoperabilityofcontainmentequipmentnecessarytoshutdown(andmaintainshutdown)thereactor.ThehydrogenignitersarenotincludedformitigationofaDesignBasisAccident(DBA)becauseanamountofhydrogenequivalenttothatgeneratedfromthereactionof75%ofthefuelcladdingwithwaterisfarinexcessofthehydrogencalculatedforthelimitingDBAlossofcoolantaccident(LOCA).ThehydrogenconcentrationresultingfromaDBAcanbemaintainedlessthantheflammability.limitusingthehydrogenrecombiners.TheDISconsistsoftwoindependenttrainsof35igniterslocatedthroughoutcontainmcnt.Theignitersineachtrainarefurtherdividedintosixgroupspertrainpoweredfromdifferentphasesoftwoseparatethreephasetransformers.Itisthetransformerphasethatuniquelydefinesagroup.OperationinModes1and2withbothtrainsavailableensuresthecapabilityforcontrolledburningofhydrogengasinsidecontainmentduringdegradedcoreLOCAevents.InModes3and4boththehydrogenproductionrateandthetotalhydrogenproductionafleraLOCAwouldbesignificantlylessthanthatcalculatedfortheDBALOCA.Also,becauseofthelimitedtimeintheseMODES,theprobabilityofanaccidentrequiringtheDISislow.ThereforetheDISisnotrequiredinModes3and4.InModes5and6,theprobabilityandconsequencesofaLOCAarereducedduetothepressureandtemperaturelimitationsoftheseModes.Therefore,theDISisnotrequiredtobeOPERABLEinModes5and6.The7dayCompletionTimeforrestorationofaninoperableDIStraininModes1or2isbasedonthelowprobabilityofoccurrenceofadegradedcoreeventthatwouldgeneratehydrogeninamountsequivalenttoametalwaterreactionof75%ofthecorecladdingandthelowprobabilityoffailureoftheOPERABLEDIStrain.Thisjustificationalsoappliestothe7dayCompletionTimeallowedforredundantignitersbeinginoperableinthesamecontainmentregion.ForthiscasetherewouldalsobeignitioncapabilityfromadjacentcontainmentregionsbyflamepropagationtotheregionwithnoOPERABLEigniters.ConfidenceinsystemOPERABILITYisdemonstratedbysurveillancetesting.Sincemanyignitersareinaccessibleatpower,surveillancetestinginMode1islimitedtomeasurementofignitercurrentwhentheDISisenergizedbygroups.Measuredcurrentsarecomparedwithbaselinedataforthegroup.Ignitertemperaturemeasurementsforalligniterscanonlybeperformedduringshutdownandisperformedevery18months.Thistestingenergizesallignitersandconfirmstheabilityofeachignitertoobtainasurfacetemperatureofatleast1700'F.Thistemperatureisconservativelyabovethetemperaturenecessarytoignitehydrogenmixturesatconcentrationsnearthelowerflammabilitylimit.Testexperienceindicatesthatindividualigniterfailuresaregenerallytotalfailuresanddonotinvolvetheinabilitytoreachtherequiredtemperaturewhenanigniterisdrawingnormalamperage.ThisobservedfailuremodeprovidesreasonableconfidencethatanigniterfailingtoreachtherequiredtemperaturewouldalsobedetectedbyreducedgroupcurrentmeasurementsduringtheMode1surveillances.Thereforethe18monthfrequencyforactualtemperaturemeasurementsisacceptable.
INDEXLIMITINCCONDITIONSFOROPERATIONANDSURVEILLANCEUIRBQBiTSSECTIONPhCE3/4,5.2ECCSSUbSYSTEMS-Tavegreaterthanorequalto3/4.5.3ECCSSUbSYSTEMS-Taveleeachan350F.........3/4.5.4bORONIHJECTIONSYSTEM350F.34.5EMERCENCYCORECOOLINCSYSTEMSECCS4IC]'EI4cACCUMUKATORS~~~~~~~~~~~~~~~~~~~~i~~~~~~~~~~~s~~~~s~~~3/45-13/4533/45-73/4.5.5IntentionallyLeftblank.............IntentionallyLeftblank.....REFUELINCVATERSTORAGETANK....~*~~3/4593/45-103/45-1134.6CONThINMENTSYSTEMS3/4.6.1PRIMARYCONTAINMENT3/4.6.23/4.6.33/4.6.4ContainaentIntegrity~~4~~~~~~~~~~~~~~~~~~~~ContainmentLeakage>>ConteizcNntAirLocks~~~~~~~~~~~~~~~~~~~i~~~~~~~~~~~~~~InternalPreeaure.~s~s~s~~~s~~~~~ii~~i~~~~~~~hirTemperature.ConcainlentStruccuralIntegrity.ConcainaencVentilationSyecea......................,..DEPRESSURIZATIONANDCOOLINCSYSTEMSContainlentSpraySyetaa0~~~~~~~~~~~~~~~~~~~~~~~~~~~~~SprayAdditiveSyacea.CONTAIHMEHTISOIATIOHVALVESCOMbUSTIbLECASCOHTMLHydropnhnalyrer~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ElectricHydrogenRecoabinere-W......................3/46-13/46-23/46-43/46-63/46-73/46-93/46-9a3/46-103/46-113/46-133/46-333/46-34COOKNUCLEARPLANT-UNIT2VIIAMZgleENTNO.I~.~<>,142 INDEXBASESSECTION.~3/4.4REACTORCOOLANTSYSTEMContinued3/4.4.9PRESSURE/TEMPERATURELIMITS.3/4.4.10STRUCTURALINTEGRITY3/4.4.11RELIEFVALVES..3/4.4.12REACTORCOOLANTVENTSYSTEMPAGEB3/44-6B3/44-10B3/44-11B3/44-113/4.5EMERGENCYCORECOOLINGSYSTEMSECCS3/4.5.1ACCUMULATORS3/4.5.2and3/4.5.3ECCSSUBSYSTEMS3/4.5.4BORONINJECTIONSYSTEM3/4.5.5REFUELINGWATERSTORAGETANK(RWST).B3/45-1B3/45-1B3/45-2B3/45-33/4.6CONTAINMENTSYSTEMS'.4.6.1PRIMARYCONTAINMENT3/4.6.2DEPRESSURIZATIONANDCOOLINGSYSTEMS.3/4.6.3CONTAINMENTISOLATIONVALVES3/4.6.4COMBUSTIBLEGASCONTROL'/4.6.5ICECONDENSERB3/46-1B3/46-33/4.7PLANTSYSTEMS3/4.7.1TURBINECYCLE3/4.7.2STEAMGENERATORPRESSURE/1'EMPERATURELIMITATION.......3/4.7.3COMPONENTCOOLINGWATERSYSTEM3/4.7.4ESSENTIALSERVICEWATERSYSTEM..."~..B3/47-1B3/474B3/474B3/4743/4.7.5CONTROLROOMEMERGENCYVENTILATIONSYSTEM...........B3/474a3/4.7.6ESFVENTILATIONSYSTEM..3/4.7.7HYDRAULICSNUBBERSB3/47-5B3/47-5COOKNUCLEARPLANT-UNIT2AMENDMENT407,4$6, 3/4LIMITINGCONDITIONSFOROPERATIONANDSURVEILLAiICEREQUIREtWIENTS3/4.6CONTAINMENTSYSTEMSDISTRIBUTEDIGNITIONSYSTEMLIMITINGCONDITIONFOROPERATION3.6.4.3BothtrainsoftheDistributedIgnitionSystemshallbeOPERABLE.APPLICABILITY:MODES1and2.ACTION:WithonetrainoftheDistributedIgnitionSysteminoperable:RestoretheinoperabletraintoOPERABLEstatuswithin7days,orPerformsurveillancerequirement4.6.4.3aonceper7daysontheOPERABLEtrainuntiltheinoperabletrainisrestoredtoOPERABLEstatus.WithnoOPERABLEhydrogenigniterinonecontainmentregion,restoreonehydrogenigniterintheaffectedcontainmentregiontoOPERABLEstatuswithin7days,orbeinHOTSTANDBYwithin6hours.SURVEILLANCEREUIREMENTS4.6.4.3EachtrainoftheDistributedIgnitionSystemshallbedemonstratedOPERABLE:Onceper92daysbyenergizingthesupplybreakersandverifyingthatatleast34of35ignitersareenergized.Onceper92days,verifyatleastonehydrogenigniterisOPERABLEineachcontainmentregion.OnceperIgmonthsbyverifyingthetemperatureofeachigniterisaminimum1700'F.~~~C/mi7~COOKNUCLEARPLANT-UNIT2Page3/46-34a 3/4BASES3/4.6CONTAINMENTSYSTEMIS3/46.4COMBUSTIBLEGASCONTROLTheOPERABILITYoftheequipmentandsystemsrequiredforthedetectionandcontrolofhydrogengasensuresthatthisequipmentwillbeavailabletomaintainthehydrogenconcentrationwithincontainmentbelowitsflammablelimitduringpost-LOCAconditions.Eitherrecombinerunitiscapableofcontrollingtheexpectedhydrogengenerationassociatedwith:I)'zirconium-waterreactions;2)radiolyticdecompositionofwater;and3)corrosionofmetalswittuncontainment.ThesehydrogencontrolsystemsareconsistentwiththerecommendationsofRegulatoryGuide1.7,"ControlofCombustibleGasConcentrationsinContainmentFollowingaLOCA,"March1971.'heacceptancecriterionof10,000ohmsisbasedonthetestbeingperformedwiththeheaterelementatanambienttemperature,butcanbeconservativelyappliedwhentheheaterelementisatatemperatureaboveambient.3/4.6.5ICECONDENSERTherequirementsassociatedwitheachofthecomponentsoftheicecondenserensurethattheoverallsystemwillbeavailabletoprovidesufficientpressuresuppressioncapabilitytolimitthecontainmentpeakpressuretransienttolessthan12psigduringLOCAconditions.3/4.6.5.1ICEBEDTheOPERABILITYoftheicebedensuresthattherequirediceinventorywill1)bedistributedevenlythroughthecontainmentbays,2)containsufficientborontoprecludedilutionofthecontainmentsumpfollowingtheLOCAand3)containsufficientheatremovalcapabilitytocondensethereactorsystemvolumereleasedduringaLOCA.Theseconditionsareconsistentwiththeassumptionsusedintheaccidentanalyses.Theminimumweightfigureof1333poundsoficeperbasketcontainsa5%conservativeallowanceforicelossthroughsublimation.Intheeventthatobservedsublimationratesareequaltoorlowerthandesignpredictionsafter,g',>%i!Ithreeyearsofoperation,theminimumicebasketsweightmaybeadjusteddownward.Inaddition,thenumberoficebasketsrequiredtobeweighedeach18monthsmaybereducedafter3yearsofoperationifsuchareductionissupportedbyobservedsublimationdata.3/4.6.5.2ICEBEDTEMPERATUREMONITORINGSYSTEMTheOPERABILITYoftheicebedtemperaturemonitoringsystemensuresthatthecapabilityisavailableformonitoringtheicetemperature.Intheeventthemonitoringsystemisinoperable,theACTIONrequirementsprovideassurancethattheicebedheatremovalcapacitywillberetainedwithinthespeciifiiedtimelimits.~p'>+<g~~~+<>>ye~~aK~&~~~o~c5~n~~~C~~~~rg+~+~~++rnid56@Wrensgp,$,5ZAPCOuy&rsdrZp)+,y,ygg~,4~~ZHryWw~~n+rrru~o'nm~~~/Zing8-<WCOOKNUCLEARPLANT-UNIT2PageB3/4~AMENDMENT4,444,A4,207 J~'I'PI DistributedIgnitionSystem(DIS)TheDISpermitscontrolledburningoftheexcessivehydrogengeneratedduringdegradedcoreLOCAspostulatedby10CFR50.44"Standardsforcombustiblegascontrolsysteminlight-water-cooledpowerreactors."Thepostulatedamountofhydrogenisequivalenttothatgeneratedfromthereactionof75'/oofthefuelcladdingwithwater.Controlledburningatlowhydrogenconcentrationsprecludescontainmentdamagethatcouldresultfromrandomignitionathighconcentrations.Anextensiveprogramoftestingandanalysishasdemonstratedthatasystemofstrategicallyplacedhydrogenigniters(theDIS)canberelieduponforcontrolledburnsofthehydrogengaspostulatedfordegradedcores.Furthermore,ithasbeenshownthatthiscanbeaccomplishedatcombustiontemperaturesandpressuresthatwillnotchallengetheintegrityofthecontainmentstructureortheoperabilityofcontainmentequipmentnecessarytoshutdown(andmaintainshutdown)thereactor.ThehydrogenignitersarenotincludedformitigationofaDesignBasisAccident(DBA)becauseanamountofhydrogenequivalenttothatgeneratedfromthereactionof75~/oofthefuelcladdingwithwaterisfarinexcessofthehydrogencalculatedforthelimitingDBAlossofcoolantaccident(LOCA).ThehydrogenconcentrationresultingfromaDBAcanbemaintainedlessthantheflammabilitylimitusingthehydrogenrecombiners.TheDISconsistsoftwoindependenttrainsof35igniterslocatedthroughoutcontainmcnt.Theignitersineachtrainarefurtherdividedintosixgroupspertrainpoweredfromdifferentphasesoftwoseparatethreephasetransformers.Itisthetransformerphasethatuniquelydefinesagroup.OperationinModes1and2withbothtrainsavailableensuresthecapabilityforcontrolledburningofhydrogengasinsidecontainmentduringdegradedcoreLOCAevents.IInModes3and4boththehydrogenproductionrateandthetotalhydrogenproductionafleraLOCAwouldbesignificantlylessthanthatcalculatedfortheDBALOCA.Also,becauseofthelimitedtimeintheseMODES,theprobabilityofanaccidentrequiringtheDISislow.ThereforetheDISisnotrequiredinModes3and4.InModes5and6,theprobabilityandconsequencesofaLOCAarereducedduetothepressureandtemperaturelimitationsoftheseModes.Therefore,theDISisnotrequiredtobeOPERABLEinModes5and6.The7dayCompletionTimeforrestorationofaninoperableDIStraininModes1or2isbasedonthelowprobabilityofoccurrenceofadegradedcoreeventthatwouldgeneratehydrogeninamountsequivalenttoametalwaterreactionof75~/oofthecorecladdingandthelowprobabilityoffailureoftheOPERABLEDIStrain.Thisjustificationalsoappliestothe7dayCompletionTimeallowedforredundantignitersbeinginoperableinthesamecontainmentregion.ForthiscasetherewouldalsobeignitioncapabilityfromadjacentcontainmentregionsbyflamepropagationtotheregionwithnoOPERABLEigniters.ConfidenceinsystemOPERABILITYisdemonstratedbysurveillancetesting.Sincemanyignitersareinaccessibleatpower,surveillancetestinginMode1islimitedtomeasurementofignitercurrentwhentheDISisenergizedbygroups.Measuredcurrentsarecomparedwithbaselinedataforthegroup.Ignitertemperaturemeasurementsforalligniterscanonlybeperformedduringshutdownandisperformedevery18months.Thistestingenergizesallignitersandconfirmstheabilityofeachignitertoobtainasurfacetemperatureofatleast1700'F.Thistemperatureisconservativelyabovethetemperaturenecessarytoignitehydrogenmixturesatconcentrationsnearthelowerflammabilitylimit.Testexperienceindicatesthatindividualigniterfailuresaregenerallytotalfailuresanddonotinvolvetheinabilitytoreachtherequiredtemperaturewhenanigniterisdrawingnormalamperage.ThisobservedfailuremodeprovidesreasonableconfidencethatanigniterfailingtoreachtherequiredtemperaturewouldalsobedetectedbyreducedgroupcurrentmeasurementsduringtheMode1surveillances.Thereforethe18monthfrequencyforactualtemperaturemeasurementsisacceptable.
ATTACHMENT3TOAEP:NRC:1291PROPOSEDAMENDMENTTOTHETECHNICALSPECIFICATIONSDISTRIBUTEDIGNITIONSYSTEM I
UNIT1 INDEXLIMITINGCONDITIONSFOROPERATIONANDSURVEILLANCEREQUIREMENTSSECTIONPAGE3/4.5EMERGENCYCORECOOLINGSYSTEMSECCS3/4;5".1ACCUMUL'ATORS3/45-13/4.5.33/4.5.4ECCSSUBSYSTEMS-Tavglessthan350'FBORONINJECTIONSYSTEM3/4.5.2ECCSSUBSYSTEMS-Tavggreaterthanorequalto350'F..3/45-33/45-73/4.5.5IntentionallyLeftBlankIntentionallyLeftBlankREFUELINGWATERSTORAGETANK3/45-93/45-103/45-113/4:6CONTAINMENTSYSTEMS3/4.6.1PRIMARYCONTAINMENTContainmentIntegrityContainment-Leakage-........ContainmentAirLocksInternalPressureAirTemperatureContainmentStructuralIntegrityContainmentVentilationSystems.3/4.6.2.DEPRESSURIZATIONANDCOOLINGSYSTEMS3/46-13/46-23/4643/46-63/46-73/46-93/46-9a3/4.6.33/4.6.4ContainmentSpraySystemSprayAdditiveSystemCONTAINMENTISOLATIONVALVESCOMBUSTIBLEGASCONTROL3/46-103/46-123/46-14HydrogenAnalyzers.ElectricHydrogenRecombiners-WDistributedIgnitionSystem3/46-233/46-243/46-25COOINGNUCLEARPLANT-UNIT1VIIAMENDMENTQR,36,k%)AS, 4I
~~3/4LIMITINGCONDITIONSFOROPERATIONANDSURVEILLANCEREQUIREMENTS3/4.6CONTAINMENTSYSTEMSELECTRICHYDROGENRECOMBINERS-WLIMITINGCONDITIONFOROPERATION3.6.4.2TwoindependentcontainmenthydrogenrecombinersystemsshallbeOPERABLE.APPLICABILITY:MODES1and2.ACTION:IWithonehydrogenrecombinersysteminoperable,restoretheinoperablesystemtoOPERABLEstatuswithin30daysorbeinatleastHOTSTANDBYwithinthenext6hours.SURVEILLANCEREUIREMENTS4.6.4.2EachhydrogenrecombinersystemshallbedemonstratedOPERABLE:Atleastonceper18monthsbyverifyingduringarecombinersystemfunctionaltestthattheminimumheatersheathtemperatureincreasesto2700'Fwithin90minutesandismaintainedforatleast2hours.b.Atleastonceper18monthsby:1.PerformingaCHANNELCALIBRATIONofallrecombinerinstrumentationandcontrolcircuits.2.Verifyingthroughavisualexaminationthatthereisnoevidenceofabnormalconditionswithintherecombiners(i.e.,loosewiringorstructuralconnections,depositsofforeignmaterials,etc.)Verifyingduringarecombinersystemfunctionaltestthattheheatersheathtemperatureincreasesto21200'Fwithin5hoursandismaintainedforatleast4hours.4,Verifyingtheintegrityofallheaterelectricalcircuitsbyperformingacontinuityandresistancetogroundtestfollowingtheaboverequiredfunctionaltest.TheresistancetogroundforanyheaterphaseshallbeR10,000ohms.COOKNUCLEARPLANT-UNIT1Page3/46-24AMENDMENT4Q,R2S, 0R~w'N1d8'II tt3/4LIMITINGCONDITIONSFOROPERATIONANDSURVEILLANCEREQUIREMENTS3/4.6CONTAINMENTSYSTEMSDISTRIBUTEDIGNITIONSYSTEMLIMITINGCONDITIONFOROPERATION3.6.4.3BothtrainsoftheDistributedIgnitionSystemshallbeOPERABLE.APPLICABILITY:MODES1and2.ACTION:WithonetrainoftheDistributedIgnitionSysteminoperable:a.RestoretheinoperabletraintoOPERABLEstatuswithin7days,orb.Performsurveillancerequirement4.6.4.3aonceper7daysontheOPERABLEtrainuntiltheinoperabletrainisrestoredtoOPERABLEstatus.WithnoOPERABLEhydrogenigniterinonecontainmentregion,restoreonehydrogenigniterintheaffectedcontainmentregiontoOPERABLEstatuswithin7days,orbeinHOTSTANDBYwithin6hours.SURVEILLANCEREUIREMENTS4.6.4.3EachtrainoftheDistributedIgnitionSystemshallbedemonstratedOPERABLE:aob.C.Onceper92daysbyenergizingthesupplybreakersandverifyingthatatleast34of35ignitersareenergized,Onceper92days,verifyatleastonehydrogenigniterisOPERABLEineachcontainmentregion.Onceper18monthsbyverifyingthetemperatureofeachigniter'isaminimum1700'F.COOKNUCLEARPLANT-UNIT1Page3/46-25 3/4BASES3/4.6CONTAINMENTSYSTEMS3/4.6.2DEPRESSURIZATIONANDCOOLINGSYSTEMS3/4.6.2.1CONTAINMENTSPRAYSYSTEMTheOPERABILITYofthecontainmentspraysystemensuresthatcontainmentdepressurizationandcoolingcapabilitywillbeavailableintheeventofaLOCA.Thepressurereductionandresultantlowercontainmentleakagerateareconsistentwiththeassumptionsusedintheaccidentanalyses.3/4.6.2.2SPRAYADDITIVESYSTEMTheOPERABILITYofthesprayadditivesystemensuresthatsufficientNaOHisaddedtothecontainmentsprayintheeventofaLOCA.ThelimitsonNaOHminimumvolumeandconcentration,ensurethat1)theiodineremovalefficiencyofthespraywaterismaintainedbecauseoftheincreaseinpHvalue,and2)corrosioneffectsoncomponentswithincontainmentareminimized.Theseassumptionsareconsistentwiththeiodineremovalefficiencyassumedintheaccidentanalyses.3/4.6.3CONTAINMENTISOLATIONVALVESTheOPERABILITYofthecontainmentisolationvalvesensuresthatthecontainmentatmospherewillbeisolatedfromtheoutsideenvironmentintheeventofareleaseofradioactivematerialtothecontainmentatmosphereorpressurizationofthecontainment.ContainmentisolationwithinthetimelimitsspecifiedensuresthatthereleaseofradioactivematerialtotheenvironmentwillbeconsistentwiththeassumptionsusedintheanalysesforaLOCA.Theopeningofcontainmentpurgeandexhaustvalvesandlockedorsealedclosedcontainmentisolationvalvesonanintermittentbasisunderadministrativecontrolincludesthefollowingconsiderations:(1)stationingaqualifiedindividual,whoisinconstantcommunicationwithcontrolroom,atthevalvecontrols,(2)instructingthisindividualtoclosethesevalvesinanaccidentsituation,and(3)assuringthatenvironmentalconditionswillnotprecludeaccesstoclosethevalvesandthatthisactionwillpreventthereleaseofradioactivityoutsidethecontainment.3/4.6.4COMBUSTIBLEGASCONTROLHydrogenAnalyzersandRecombinersTheOPERABILITYoftheequipmentandsystemsrequiredforthedetectionandcontrolofhydrogengasensuresthatthisequipmentwillbeavailabletomaintainthehydrogenconcentrationwithincontainmentbelowitsflammablelimitduringpost-LOCAconditions.Eitherrecombinerunitiscapableofcontrollingtheexpectedhydrogengenerationassociatedwith1)zirconium-waterreactions,2)radiolyticdecompositionofwaterand3)corrosionofmetalswithincontainment.Theacceptancecriteriaof10,000ohmsisbasedonthetestbeingperformedwiththeheaterelementatanambienttemperature,butcanbeconservativelyappliedwhentheheaterelementisatatemperatureaboveambient.DistributedIgnitionSystem(DIS)TheDISpermitscontrolledburningoftheexcessivehydrogengeneratedduringdegradedcoreLOCAspostulatedby10CFR50.44,"Standardsforcombustiblegascontrolsysteminlight-water-cooledpowerreactors."Thepostulatedamountofhydrogenisequivalenttothatgeneratedfromthereactionof75%ofthefuelcladdingwithwater.ControHedburningatlowhydrogenconcentrationsprecludescontainmentdamagethatcouldresultfromrandomignitionathighconcentrations.Anextensiveprogramoftestingandanalysishasdemonstratedthatasystemofstrategicallyplacedhydrogenigniters(theDIS)canberelieduponforcontrolledburnsofthehydrogengaspostulatedCOOKNUCLEARPLANT-UNIT1PageB3/46-3AMENDMENT4R,~,
CJe 3/4BASES3/4.6CONTAINMENTSYSTEMS3/4.6.4COMBUSTIBLEGASCONTROLcontinuedfordegradedcores.Furthermore,ithasbeenshownthatthiscanbeaccomplishedatcombustiontemperaturesandpressuresthatwillnotchallengetheintegrityofthecontainmentstructureortheoperabilityofcontainmentequipmentnecessarytoshutdown(andmaintainshutdown)thereactor.ThehydrogenignitersarenotincludedformitigationofaDesignBasisAccident(DBA)becauseanamountofhydrogenequivalenttothatgeneratedfromthereactionof75%ofthefuelcladdingwithwaterisfarinexcessofthehydrogencalculatedforthelimitingDBAlossofcoolantaccident(LOCA).ThehydrogenconcentrationresultingfromaDBAcanbemaintainedlessthantheflammabilitylimitusingthehydrogenrecombiners.TheDISconsistsoftwoindependenttrainsof35igniterslocatedthroughoutcontainment.Theignitersineachtrainarefurtherdividedintosixgroupspertrainpoweredfromdifferentphasesoftwoseparatethreephasetransformers.Itisthetransformerphasethatuniquelydefinesagroup.OperationinMODES1and2withbothtrainsavailableensuresthecapabilityforcontrolledburningofhydrogengasinsidecontainmentduringdegradedcoreLOCAevents.InMODES3and4boththehydrogenproductionrateandthetotalhydrogenproductionafteraLOCAwouldbesignificantlylessthanthatcalculatedfortheDBALOCA.Also,becauseofthelimitedtimeintheseMODES,theprobabilityofanaccidentrequiringtheDISislow.ThereforetheDISisnotrequiredinMODES3and4.InMODES5and6,theprobabilityandconsequencesofaLOCAarereducedduetothepressureandtemperaturelimitationsoftheseMODES.Therefore,theDISisnotrequiredtobeOPERABLEinMODES5and6.The7dayCompletionTimeforrestorationofaninoperableDIStraininMODES1or2isbasedonthelowprobabilityofoccurrenceofadegradedcoreeventthatwouldgeneratehydrogeninamountsequivalenttoametalwaterreactionof75%ofthecorecladdingandthelowprobabilityoffailureoftheOPERABLEDIStrain.Thisjustificationalsoappliestothe7dayCompletionTimeallowedforredundantignitersbeinginoperableinthesamecontainmentregion.ForthiscasetherewouldalsobeignitioncapabilityfromadjacentcontainmentregionsbyflamepropagationtotheregionwithnoOPERABLEigniters.ConfidenceinsystemOPERABILITYisdemonstratedbysurveillancetesting.Sincemanyignitersareinaccessibleatpower,surveillancetestinginMODE1islimitedtomeasurementofignitercurrentwhentheDISisenergizedbygroups.Measuredcurrentsarecomparedwithbaselinedataforthegroup.Ignitertemperaturemeasurementsforalligniterscanonlybeperformedduringshutdownandisperformedevery18months.Thistestingenergizesallignitersandconfirmstheabilityofeachignitertoobtainasurfacetemperatureofatleast1700'F.Thistemperatureisconservativelyabovethetemperaturenecessarytoignitehydrogenmixturesatconcentrationsnearthelowerflammabilitylimit.Testexperienceindicatesthatindividualigniterfailuresaregenerallytotalfailuresanddonotinvolvetheinabilitytoreachtherequiredtemperaturewhenanigniterisdrawingnormalamperage.ThisobservedfailuremodeprovidesreasonableconfidencethatanigniterfailingtoreachtherequiredtemperaturewouldalsobedetectedbyreducedgroupcurrentmeasurementsduringtheMODE1surveillances.Thereforethe18monthfrequencyforactualtemperaturemeasurementsisacceptable.COOKNUCLEARPLANT-UNIT1PageB3/46-3a 0INDEXLIMITINGCONDITIONSFOROPERATIONANDSURVEILLANCEREQUIREMENTSSECTIONPAGE3/4.5EMERGENCYCORECOOLINGSYSTEMSECCS3/4.5.1ACCUMULATORS3/45-13/4.5.2ECCSSUBSYSTEMS-Tavggreaterthanorequalto350'F..3/4.5.3ECCSSUBSYSTEMS-Tavglessthan350'F3/4.5.4BORONINJECTIONSYSTEMIntentionallyLeftBlankIntentionallyLeftBlank3/4.5.5REFUELINGWATERSTORAGETANK3/4.6CONTAINMENTSYSTEMS3/45-33/45-73/45-93/45-103/45-113/4.6.1PRIMARYCONTAINMENTContainmentIntegrityContainmentLeakageContainmentAirLocksInternalPressureAirTemperatureContainmentStructuralIntegrityContainmentVentilationSystem3/4.6.2DEPRESSURIZATIONANDCOOLINGSYSTEMSContainmentSpraySystemSprayAdditiveSystem3/4.6.3CONTAINMENTISOLATIONVALVES3/46-13/46-23/46P3/46-63/46-73/46-93/46-9a3/46-103/46-113/46-133/4.6.4COMBUSTIBLEGASCONTROLHydrogenAnalyzer..ElectricHydrogenRecom(iners-WDistributedIgnitionSystem3/46-333/46-343/46-34aCOOKNUCLEARPLANT-UNIT2AMENDMENT48,QQ,445, lc INDEXBASESSECTIONPAGE3/4.4REACTORCOOLANTSYSTEMContinued3/4.4.9PRESSURE/TEMPERATURELIMITS3/4.4.10STRUCTURALINTEGRITY3/4.4.11RELIEFVALVES..3/4.4.12REACTORCOOLANTVENTSYSTEMB3/44-6B3/44-10B3/44-11B3/44-113/4.5EMERGENCYCORECOOLINGSYSTEMSECCS3/4.5.1ACCUMULATORS3/4.5.2and3/4.5.3ECCSSUBSYSTEMS3/4.5.4BORONINJECTIONSYSTEM..3/4.5.5REFUELINGWATERSTORAGETANK(RWST)..B3/45-1B3/45-1B3/45-2B3/45-33/4.6CONTAINMENTSYSTEMS3.4.6.1PRIMARYCONTAINMENT3/4.6.2DEPRESSURIZATIONANDCOOLINGSYSTEMS3/4.6.3CONTAINMENTISOLATIONVALVES3/4.6.4COMBUSTIBLEGASCONTROL....3/4.6.5ICECONDENSERB3/46-1B3/46-3B3/46-3B3/464B3/464a3/4.7PLANTSYSTEMS3/4.7.1TURBINECYCLE3/4.7.2STEAMGENERATORPRESSURE/TEMPERATURELIMITATION3/4.7.3COMPONENTCOOLINGWATERSYSTEM3/4.7.4ESSENTIALSERVICEWATERSYSTEM..3/4:7.5CONTROLROOMEMERGENCYVENTILATIONSYSTEM3/4.7.6ESFVENTILATIONSYSTEM.3/4.7.7HYDRAULICSNUBBERSB3/47-1B3/47-4B3/474B3/47-4B3/474aB3/47-5B3/47-5COOKNUCLEARPLANT-UNIT2XIIAMENDMENT4P,4',IVY, 3/4LIMITINGCONDITIONSFOROPERATIONANDSURVEILLANCEREQUIREMENTS3/4.6CONTAINMENTSYSTEMSDISTRIBUTEDIGNITIONSYSTEMLIMITINGCONDITIONFOROPERATION3.6.4.3BothtrainsoftheDistributedIgnitionSystemshallbeOPERABLE.APPLICABILITY:MODES1and2.ACTION:WithonetrainoftheDistributedIgnitionSysteminoperable:RestoretheinoperabletraintoOPERABLEstatuswithin7days,orPerformsurveillancerequirement4.6.4.3aonceper7daysontheOPERABLEtrainuntiltheinoperabletrainisrestoredtoOPERABLEstatus.WithnoOPERABLEhydrogenigniterinonecontainmentregion,restoreonehydrogenigniterintheaffectedcontainmentregiontoOPERABLEstatuswithin7days,orbeinHOTSTANDBYwithin6hours.SURVEILLANCEREUIREMENTS4.6.4.3EachtrainoftheDistributedIgnitionSystemshallbedemonstratedOPERABLE:Onceper92daysbyenergizingthesupplybreakersandverifyingthatatleast34of35ignitersareenergized.Onceper92days,verifyatleastonehydrogenigniterisOPERABLEineachcontainmentregion.Onceper-18monthsbyverifyingthetemperatureofeachigniterisaminimum1700'F.COOKNUCLEARPLANT-UNIT2Page3/46-34aAMENDMENT 3/4'ASES3/4.6CONTAINMENTSYSTEMS3/4.6.4COMBUSTIBLEGASCONTROLHydrogenAnalyzersandRecombinersTheOPERABILITYoftheequipmentandsystemsrequiredforthedetectionandcontrolofhydrogengasensuresthatthisequipmentwillbeavailabletomaintainthehydrogenconcentrationwithincontainmentbelowitsflammablelimitduringpost-LOCAconditions.Eitherrecombinerunitiscapableofcontrollingtheexpectedhydrogengenerationassociatedwith1)zirconium-waterreactions,2)radiolyticdecompositionofwaterand3)corrosionofmetalswithincontainment.ThesehydrogencontrolsystemsareconsistentwiththerecommendationsofRegulatoryGuide1.7,"ControlofCombustibleGasConcentrationsinContainmentFollowingaLOCA,"March1971.Theacceptancecriterionof10,000ohmsisbasedonthetestbeingperformedwiththeheaterelementatanambienttemperature,butcanbeconservativelyappliedwhentheheaterelementisatatemperatureaboveambient.DistributedIgnitionSystem(DIS)TheDISpermitscontrolledburningoftheexcessivehydrogengeneratedduringdegradedcoreLOCAspostulatedby10CFR50.44,"Standardsforcombustiblegascontrolsysteminlight-waterwooledpowerreactors."Thepostulatedamountofhydrogenisequivalenttothatgeneratedfromthereactionof75%ofthefuelcladdingwithwater.Controlledburningatlowhydrogenconcentrationsprecludescontainmentdamagethatcouldresultfromrandomignitionathighconcentrations.Anextensiveprogramoftestingandanalysishasdemonstratedthatasystemofstrategicallyplacedhydrogenigniters(theDIS)canberelieduponforcontrolledburnsofthehydrogengaspostulatedfordegradedcores.Furthermore,ithasbeenshownthatthiscanbeaccomplishedatcombustiontemperaturesandpressuresthatwillnotchallengetheintegrityofthecontainmentstructureortheoperabilityofcontainmentequipmentnecessarytoshutdown(andmaintainshutdown)thereactor.ThehydrogenignitersarenotincludedformitigationofaDesignBasisAccident(DBA)becauseanamountofhydrogenequivalenttothatgeneratedfromthereactionof75%ofthefuelcladdingwithwaterisfarinexcessofthehydrogencalculatedforthelimitingDBAlossofcoolantaccident(LOCA).ThehydrogenconcentrationresultingfromaDBAcanbemaintainedlessthantheflammabilitylimitusingthehydrogenrecombiners.TheDISconsistsoftwoindependenttrainsof35igniterslocatedthroughoutcontainment.Theignitersineachtrainarefurtherdividedintosixgroupspertrainpoweredfromdifferentphasesoftwoseparatethreephasetransformers.Itisthetransformerphasethatuniquelydefinesagroup.OperationinMODES1and2withbothtrainsavailableensuresthecapabilityforcontrolledburningofhydrogengasinsidecontainmentduringdegradedcoreLOCAevents.InMODES3and4boththehydrogenproductionrateandthetotalhydrogenproductionafteraLOCAwouldbesignificantlylessthanthatcalculatedfortheDBALOCA.Also,becauseofthelimitedtimeintheseMODES,theprobabilityofanaccidentrequiringtheDISislow.ThereforetheDISisnotrequiredinMODES3and4.InMODES5and6,theprobabilityandconsequencesofaLOCAarereducedduetothepressureandtemperaturelimitationsoftheseMODES.Therefore,theDISisnotrequiredtobeOPERABLEinMODES5and6.The7dayCompletionTimeforrestorationofaninoperableDIStraininMODES1or2isbasedonthelowprobabilityofoccurrenceofadegradedcoreeventthatwouldgeneratehydrogeninamountsequivalenttoametalwaterreactionof75%ofthecorecladdingandthelowprobabilityoffailureoftheOPERABLEDIStrain.Thisjustificationalsoappliestothe7dayCompletionTimeallowedforredundantignitersbeinginoperableinthesameCOOKNUCLEARPLANT-UNIT2PageB3/4MAMENDMENTQ%,
C'I~
3/4BASES3/4.6CONTAINMENTSYSTEMS3/4.f~.4COMBUSTIBLEGASCONTROLcontinuedcontainmentregion.ForthiscasetherewouldalsobeignitioncapabilityfromadjacentcontainmentregionsbyflamepropagationtotheregionwithnoOPERABLEigniters.ConfidenceinsystemOPERABILITYisdemonstratedbysurveillancetesting.Sincemanyignitersareinaccessibleatpower,surveillancetestinginMODE1islimitedtomeasurementofignitercurrentwhentheDISisenergizedbygroups.Measuredcurrentsarecomparedwithbaselinedataforthegroup.Ignitertemperaturemeasurementsforalligniterscanonlybeperformedduringshutdownandi5performedevery18months.Thisitestingenergizesallignitersandconfirmstheabilityofeachignitertoobtainasurfacetemperatureofatleast1700'F.Thistemperatureisconservativelyabovethetemperaturenecessarytoignitehydrogenmixturesatconcentrationsnearthelowerflammabilitylimit.Testexperienceindicatesthatindividualigniterfailuresaregenerallytotalfailuresanddonotinvolvetheinabilitytoreachtherequiredtemperaturewhenanigniterisdrawingnormalamperage.ThisobservedfailuremodeprovidesreasonableconfidencethatanigniterfailingtoreachtherequiredtemperaturewouldalsobedetectedbyreducedgroupcurrentmeasurementsduringtheMODE1surveillances.Thereforethe18monthfrequencyforactualtemperaturemeasurementsisacceptable.3/4.6.5ICECONDENSERTherequirementsassociatedwitheachofthecomponentsoftheicecondenserensurethattheoverallsystemwillbeavailabletoprovidesufficientpressuresuppressioncapabilitytolimitthecontainmentpeakpressuretransienttolessthan12psigduringLOCAconditions.3/4.6.5.1ICEBEDTheOPERABILITYoftheicebedensuresthattherequirediceinventorywill1)bedistributedevenlythroughthecontainmentbays,2)containsufficientborontoprecludedilutionofthecontainmentsumpfollowingtheLOCAand3)containsufficientheatremovalcapabilitytocondensethereactorsystemvolumereleasedduringaLOCA.Theseconditionsareconsistentwiththeassumptionsusedintheaccidentanalyses.Theminimumweightfigureof1333poundsoficeperbasketcontainsa5%conservativeallowanceforicelossthrough'sublimation.Intheeventthatobservedsublimationratesareequaltoorlowerthandesignpredictionsafterthreeyearsofoperation,theminimumicebasketsweightmaybeadjusteddownward.Inaddition,thenumberoficebasketsrequiredtobeweighedeach18monthsmaybereducedafter3yearsofoperationifsuchareductionissupportedbyobservedsublimationdata.3/4.6.5.2ICEBEDTEMPERATUREMONITORINGSYSTEMTheOPERABILITYoftheicebedtemperaturemonitoringsystemensuresthatthecapabilityisavailableformonitoringtheicetemperature.Intheeventthemonitoringsystemisinoperable,theACTIONrequirementsprovideassurancethattheicebedheatremovalcapacitywillberetainedwithinthespecifiedtimelimits.COOKNUCLEARPLANT-UNIT2PageB3/4&4a
~~5PI(e'h\