ML17228A652
| ML17228A652 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 07/28/1994 |
| From: | FLORIDA POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML17228A651 | List: |
| References | |
| GL-90-06, GL-90-6, NUDOCS 9408010287 | |
| Download: ML17228A652 (16) | |
Text
St.LucieUnit1.DocketNo.50-335ProposedLicenseAmendmentST.LUCIEUNIT1MARKER)-UPTECHNICALSPECIFICATIONPAGESPage3/44-59InsertAPageB3/44-15PDR+0+879+07P89<08O1"~o<<OSOOO33g-=----.PDR
'REACTORCOOLANTSYSTEMPOWEROPERATEDRELIEFVALVES.LIMITINGCONDITIONFOROPERATION3.4.13Twopoweroperatedreliefvalves(PORVs)shallbeOPERABLE,withtheir-setpointsselectedtothelowtemperaturemodeofoperationasfollows:a.Asetpointoflessthanorequalto350psiashallbeselected:1.DuringcooldownwhenthetemperatureofanyRCScoldlegislessthanorequalto215'Fand2.DuringheatupandisothermalconditionswhenthetemperatureofanyRCScoldlegislessthanorequalto193'F.b.Asetpointoflessthanorequalto530psiashallbeselected:l.DuringcooldownwhenthetemperatureofanyRCScoldlegisgreaterthan215'Fandlessthanorequalto281'F.2.DuringheatupandisothermalconditionswhenthetemperatureofanyRCScoldlegisgreaterthanorequalto193'Fandlessthanorequalto304'F.PP~N'LITY.MODES4Md&.AC4N:a.WithlessthantwoPORVsOPERABLEandwhileatHotShutdownduringa.pnnedcooldown,bothPORVswillbereturnedtoOPERABLEstatuspritoenteringtheapplicableMODEunless:1.Theepairscannotbeaccomplishedwithin24hoursortrepaircannotbeperformedunderhotconditions,or2.Anotheraionstatementrequirescooldown,or3.PlantandpernelsafetyrequirescooldownCol'dShutdownwithextremecauon.b.WithlessthantwoPORVsPERABLEwhileinDSHUTDOWN,bothPORVswillbereturnedtoOPERABstatuspriorostartup.c.TheprovisionsofSpecificatio3.0.renotapplicable.SURVEILLANCEREUIREMENTS4.4.13ThePORVsshallbeverifled+P~flBLEby:a.VerifyingtheisolationvdlgesareopenwhethePORVsareresettothelowtemperaturmoIIfofoperation.b.Performanceofa$HNNELR5TIONALTESToftheRectorCoolantSystemoverpres5irizationpotectionsystemcircuitruptoandincludingthreliefvalvsolenoidsonceperrefuelinutage.c.-PerformseofaCHANCALIBRATIONofthepressurizerpreuresensi9channelsoncper18months.ReacCoolantSystemcolegtemperaturebelow304'F.PVsarenotrequiredbeow140'FwhenRCSdoesnothavepressureboundary~&t~~ST.LUCIE-UNITl3/44-59Amendment5g.A.gfPALACEseaseaIIMKMT-A~saseafasass~R~S~~
St.LucieUnit1DocketNo.50-335ProposedLicenseAmendmentLTOPReuirementsforPower0cratedReliefValvesGL90-06INSERTAAPPLICABILITY:MODE4whenthetemperatureofanyRCScoldlegislessthanorequalto304'F,MODE5,andMODE6whentheheadisonthereactorvessel;andtheRCSisnotventedthroughgreaterthana1.75squareinchvent.ACTIONJatb.C~d0e.WithonePORVinoperableinMODE4IrestoretheinoperablePORVtoOPERABLEstatuswithin7days;ordepressurizeandventtheRCSthroughgreaterthana1.75squareinchventwithinthenext8hours.WithonePORVinoperableinMODES5or6,either(1)restoretheinoperablePORVtoOPERABLEstatuswithin24hours,or(2)completedepressurizationandventingoftheRCSthroughgreaterthana1.75squareinchventwithinatotalof32hours.WithbothPORVsinoperable,restoreatleastonePORVtooperablestatusorcompletedepressurizationandventingoftheRCSthroughgreaterthana1.75squareinchventwithin24hours.WiththeRCSventedperACTIONSa,b,orc,verifytheventpathwayatleastonceper31dayswhenthepathwayisprovidedbyavalve(s)thatislocked,sealed,orotherwisesecuredintheopenposition;otherwise,verifytheventpathwayevery12hours.IntheeventeitherthePORVsortheRCSvent(s)areusedtomitigateanRCSpressuretransient,aSpecialReportshallbepreparedandsubmittedtotheCommissionpursuanttoSpecification6.9.2within30days.Thereportshalldescribethecircumstancesinitiatingthetransient,theeffectofthePORVsorRCSvent(s)onthetransient,andanycorrectiveactionnecessarytopreventrecurrence.f.TheprovisionsofSpecification3.0.4arenotapplicable.SURVEILLANCEREQUIREMENTS4.4.13EachPORVshallbedemonstratedOPERABLEby:VerifyingthePORVisolationvalveisopenatleastonceper72hours;andb.c~PerformanceofaCHANNELFUNCTIONALTEST,butexcludingvalveoperation,atleastonceper31days;andPerformanceofaCHANNELCALIBRATIONatleastonceper18months.
REACTORCOOLANTSYSTEMBASES3/4.4.13POWEROPERATEDRELIEFVALVESand34.4.14REACTORCOOLANTPUHP-RTINGThelowtemperatureoverpressureprotectionsystem(LTOP}isdesignedtopreventRCSoverpressurizationabovethe10CFRAppendix6operatinglimitcurves(Figures3.4-2aand3.4-2b)atRCStemperaturesatorbeTow304'F.duringheatupand281'FduringCooldown.TheLTOPsystemisbasedontheuseofthepressurizerpower-operatedreliefvalves(PORVs)andtheimplementationofadministrativeandoperationalcontrols.ThePORVsalignedtotheRCSwiththelowpressuresetpointsof350and530psia,restrictionsonRCPstarts,limitationsonheatupandcooldownrates,anddisablingofnon-essentialcomponentsprovideassurancethatAppendixGP/TlimitswillnotbeexceededduringnormaloperationordesignbasisoverpressurizationeventsduetomassorenergyadditiontotheRCS.3/4.4.15REACTORCOOLANTSYSTEMVENTSReactorCoolantSystemventsareprovidedtoexhaustnoncondensiblegasesand/orsteamfromtheprimarysystemthatcouldinhibitnaturalcirculationcorecooling.TheOPERABILITYofatleastoneReactorCoolantSystemventpathfromthereactorvesselheadandthepressurizersteamspaceensuresthecapabilityexiststoperformthisfunction.TheredundancydesignoftheReactorCoolantSystemventsystemsservestominimizetheprobabilityofinadvertentorirreverisibleactuationwhileensuringthatasinglefailureofaventvalve,powersupply,orcontrolsystemdoesnotpreventisolationoftheventspath.Thefunction,capabilities,andtestingrequirementsoftheReactorCoolantSystemventsystemareconsistentwiththerequirementsofItemII.b.lofNUREG-0737,"ClarificationofTMIActionPlanRequirements,"November1980..iTheLTOPsystemAPPLICABILITY,ACTIONS,andSURVEILLANCEREQUIREMENTSareconsistentwiththeresolutionofGenericIssue94,"AdditionalLow-TemperatureOverpressureProtectionforLight-WaterReactors,"pursuanttoGenericLetter90-06.ST.LUCIE-UNIT1B3/44-15AmendmentNo.gg,gg,@f,
- a+PPPtoVt' St.LucieUnit1DocketNo.50-335ProposedLicenseAmendmentEVALUATIONOFPROPOSEDTSCHANGES St.LucieUnit1DocketNo.50-335ProposedLicenseAmendmentLTOPReuirementsforPower0cratedReliefValvesGL90-06L-94-153Attachment2Page1of5EVALUATIONOFPROPOSEDTSCHANGESIntroductionFloridaPowerandLightCompany(FPL)proposestochangetheSt.LucieUnit1TechnicalSpecifications(TS)fortheReactorCoolantSystem(RCS)PowerOperatedReliefValves(PORV).TheproposedrevisionincorporatesadditionalrequirementsforLowTemperatureOverpressureProtection(LTOP)whicharesimilartothoserecommendedbytheNRCstaffviaGenericLetter90-06(GL90-06).TheTSupgradeisinaccordancewiththecommitmentmadebyFPLinconnectionwiththeresolutionofGenericIssue94(GI-94)forSt.LucieUnits1and2(FPLLetterL-92-288;10/9/92).BackroundGL90-06wasissuedbytheNRConJune25,1990,toadvisePWRlicenseesofstaffpositionsdevelopedduringtheresolutionofGenericIssue70(GI-70),"PowerOperatedReliefValveandBlockValveOperability,"andGI-94,"AdditionalLow-TemperatureOverpressureProtectionforLight-WaterReactors."BylettersdatedDecember20,1990,December6,1991,May11,1992,andOctober9,1992,FPLrespondedtoGL90-06forSt.LucieUnits1and2.TheselettersdescribeFPL'splanforimplementationofrecommendationscontainedinthegenericletter.TheNRCreviewedFPL'ssubmittalsandfoundthemacceptable(NRCletterdatedAugust20,1993).ForGI94,acceptabilitywasbased,inpart,onacommitmentbyFPLtosubmitachangetotheSt.LucieUnit1TSthatissimilartotheGL90-06specificationsforLTOP.ThissubmittalwouldbemadewithinoneyearofreceivingstaffacceptanceofFPL'sproposedplanforimplementationoftheGL90-06recommendations.DescritionofChanesTheAPPLICABILITY,ACTIONS,andSURVEILLANCEREQUIREMENTSofTS3/4.4.13havebeenrewrittenintheirentiretyusingtheguidanceprovidedfor"ModifiedTechnicalSpecificationsforCombustionEngineeringandWestinghousePlants",whichiscontainedinEnclosureBofGL90-06.PlantspecificdeviationsfromthemodelTSareshowninbrackets[].LCO3.4.13APPLICABILITYischangedtoread
- "MODE4whenthetemperatureofanyRCScoldlegislessthanorequalto304F, St.LucieUnit1DocketNo.50-335ProposedLicenseAmendment"LTOPReuirementsforPower0cratedReliefValvesGL90-06L-94-153Attachment2Page2of5MODE5,andMODE6whentheheadisonthereactorvessel;andtheRCSisnotventedthroughgreaterthana1.75squareinchvent."ACTION-aappliestooneinoperablePORVwheninMODE4withthetemperatureofanyRCScoldleglessthanorequalto304'F.ItrequiresthattheinoperablePORVberestoredtoOPERABLEstatuswithin7days;ordepressurizeandventtheRCSthroughgreaterthana1.75squareinchventwithinthenext8hours.ACTION-bappliestooneinoperablePORVwhenLTOPisrequiredinMODES5or6.ItrequiresthattheinoperablePORVberestoredtoOPERABLEstatuswithin24hours,orcompletedepressurizationandventingoftheRCSthroughgreaterthana1.75squareinchventwithinatotalof32hours.ACTION-cappliestoaconditionwherebothPORVsareinoperablebelowanRCStemperatureof304F.Itrequiresthat[atleastonePORVberestoredtooperablestatusor]depressurizationandventingoftheRCSthroughgreaterthana1.75squareinchventbecompletedwithin[24]hours.ACTION-drequiresthattheventpathway,whenestablishedperActionsa,b,orc,beverifiedatleastonceper31dayswhenthepathwayisprovidedbyavalve(s)thatislocked,sealed,orotherwisesecuredintheopenposition;otherwisethepathwaymustbeverifiedevery12hours.ACTION-erequiresaSpecialReporttobesubmittedtotheCommission,pursuanttoSpecification6.9.2,within30daysofaneventwhereeitherthePORVsorRCSvent(s)areusedtomitigateanRCSpressuretransient.ACTION-fexcludesthisLimitingConditionforOperationfromtherequirementsofTS3.0.4.SURVEILLANCEREUIREMENTSareupgradedtorequirethatOPERABILITYofeachPORVbedemonstratedbyverifyingtheassociatedPORVisolationvalveopenatleastonceper72hours;performingaChannelFunctionalTest(excludingvalveoperation)atleastonceper31days'ndperformingaChannelCalibrationatleastonceper18months.BASESpageB3/44-15isupdatedtoreflectthatTS3/4.4.13isconsistentwithGL90-06.
St.LucieUnit1DocketNo.50-335ProposedLicenseAmendmentLTOPReuirementsforPower0cratedReliefValvesGL90-06L-94-153Attachment2Page3of5EvaluationLTOPisprovidedbythePORVsonthepressurizer.IfanRCSpressuretransientoccursduringlowtemperatureoperations,thePORVsaresetatpressuressufficientlylowtopreventviolationof10CFR50,AppendixG,heatupandcooldowncurves.TheprotectionrangeandPORVsetpointsselectedforLTOPweredeterminedbypreviousanalysesandapprovedbytheNRCviaissuanceofAmendmentNo.104(6/11/90)totheSt.LucieUnit1(PSL1)operatinglicense.Thechangesproposedbythissubmittaldonotalterthebases,conclusions,ortemperature/pressurerangeofthepreviouslyapprovedanalyses;nordotheyaltertheLTOPsettingswhicharespecifiedintheexistingLCO3.4.13.StudiesperformedforGI-94showthatpressuretransientswhichhavechallengedtheLTOPsystemsatnuclearpowerplantshaveoccurredwithRCStemperaturesintherangeof80'Fto190'F.TheNRCstaffconcludedfromthesestudiesthatimprovedadministrativerestrictionsinvolvingAllowedOutageTimes(AOT)forinoperableLTOPequipmentshouldbeextendedtoincludeMODES5and6whentheheadisonthereactorvessel,andtheRCSisnotalignedthroughanappropriateventpath.TheproposedamendmentextendsAPPLICABILITYofTS3/4.4.13totheplantconditionsthatareconsistentwiththestaff'sconclusionanddoesnotdeviatefromtheguidanceinGL90-06.ExistingTS1.16definestheLowTemperatureRCSProtectionRange.Withinthisdefinition,theRCSdoesnothavepressureboundaryintegritywhentheRCSisopentocontainmentandtheminimumareaoftheRCSopeningisgreaterthan1.75squareinches.Suchanopeningislargerthantheminimumorificearea(1.354squareinches)ofonepressurizerPORV.LTOPanalysesforPSL1demonstratethatonePORV,inconjunctionwithexistingTSconstraintsonhighpressuresafetyinjectionpumpoperabilityandreactorcoolantpump(RCP)starting,hassufficientflowcapacitytomitigatetheworstcasemassandenergytransientsconsideredreasonableduringtheapplicablemodes.Therefore,theminimumventsizespecifiedbytheproposedLCOisappropriatefortheLTOPrange.TwooperablePORVsprovideredundancyforthepurposeofsatisfyingsingle-failurecriteriaassociatedwithLCO3.4.13.InMODE4,ACTION-aallowsa7-dayAOTtorestoreaninoperableLTOPchanneltooperablestatusbeforeotherremedialactionswouldhavetobetaken.Sevendaysisconsideredacceptablebasedontheverylowlikelihoodofanactivefailureoccurringintheoperablevalve St.LucieUnit1DocketNo.50-335ProposedLicenseAmendmentLTOPReuirementsforPower0cratedReliefValvesGL90-06L-94-153Attachment2Page4of5pathduringthisperiodoftime,andconsideringthetransientmitigationcapabilityofasinglePORV.InMODES5or6,ACTION-bprovidesaddedassuranceofLTOPavailabilitybyreducingtheAOTforasingleinoperablechanneltoonly24hoursbeforeotherremedialactionsarerequired.ThismorerestrictivelimitwillimproveLTOPavailabilityundercertainplantconditionswhen"thepotentialforanoverpressuretransientishighest".TheproposedactionstatementsdonotdeviatefromtheguidanceinGL90-06.IftheinoperableLTOPchannelcannotberestoredtoOPERABLEstatuswithintheAOTspecifiedinACTION-aorACTION-b,theRCSmustbedepressurizedandventedwithinthenext8hours.Thecompletiontimetoplacetheplantinthisconditionisreasonable,consideringthetotaltimefromthepointofenteringtheactionstatement(176hoursinMODE4or32hoursinMODES5or6)andoperatorawarenessoftheadministrativecontrolrequirements.ThisAOTforasingleinoperablePORVdoesnotdeviatefromtheguidanceinGL90-06.IfbothPORVsbecomeinoperable,proposedACTION-crequirescompletionofallremedialactionswithin24hours.ThisAOTislongerthanthe8hoursrecommendedinGL90-06.SinceACTION-cappliestoMODE4as-well-asMODES5and6,andsincethespecifiedintervalrepresentsthetotaltimeallowedtocompletetheactionfromtheinstanttheapplicableconditionisdiscovered,FPLconsiderstheGL90-06recommendationtobeimpracticable.Basedonplantoperatingexperience,an8-hourperiodisnotconducivetoachievinganorderlyandcontrolledcooldown-depressurizationandwouldunnecessarilyincreasetheriskassociatedwiththistypeoftransient.Inaddition,theproposed24hourintervalisinagreementwithotherexistingPSLlspecificationswhichrequirecooldownanddepressurizationthroughtheMODE4range.FPLbelievestheproposedactioncompletiontimesatisfiestheintentofGL90-06.TheactionsproposedforLCO3.4.13alsoprovideforongoingverificationoftheventpathway(ACTION-d),specialreportingrequirements(ACTION-e),andexclusionfromtheprovisionsofTS3.0.4(ACTION-f).TheseactionstatementsdonotdeviatefromtheguidanceinGL90-06andthebasesforthegenericrequirementsareapplicabletoSt.LucieUnit1.TheproposedSURVEILLANCEREUIREMENTSdonotdeviatefromthoserecommendedinGL90-06.The72hourfrequencyforPORVISOLATIONVALVEOPENpositionverificationisreasonable,consideringthatremotepositionindicationisavailableinthecontrolroom;andthatalarmannunciationwilloccurifaPORVisolationvalveisnot St.LucieUnit1DocketNo.50-335ProposedLicenseAmendmentLTOPReuirementsforPower0cratedReliefValvesGL90-06L-94-153Attachment2Page5of5fullyopenintheLTOPrange.TheCHANNELFUNCTIONALTESTwillverifythatthePORVliftsetpointsarewithintheLCOlimitsonaperiodicbasis.The31dayfrequencyisconsistentwiththatoffunctionaltestsperformedonothersafetysystems.SincePORVactuationcoulddepressurizetheRCS,valveoperationisnotrequiredforthistest.TheCHANNELCALIBRATIONistheadjustment,asnecessary,ofthechanneloutputtorespondwiththeproperrangeandaccuracytoknowninputsignalsandisperformedpursuanttoTS1.4.Thespecifiedfrequencyof18monthsisconsistentwithothercalibrationsofthisnature,andwithPSL1refuelingoutageschedules.ThePORVsaretestedpursuanttotheInserviceTestingProgramwhichisreviewedandapprovedbytheNRC.Basedonplantoperatingexperience,FPLconsiderstheproposedsurveillancerequirementstobeacceptable.InadditiontothechangesproposedforTS3/4.4.13,existingSt.LucieUnit1TSimposerestrictionsonthenumberofoperablesafetyinjectionpumps(TS3.5.3)andtheconditionsforstartingRCPs(TS3.4.14)whentheRCSisintheLTOPrange.Theseadditionalcontrolsaredesignedtoreducethepotentialfortheoccurrenceofoverpressureeventsthatcouldbecausedbytheadditionofnon-essentialmassandenergytotheRCS,andareconsistentwiththeSt.LucieUnit1LTOPsafetyanalysis.conclusionImprovedadministrativerestrictionsinvolvingtheAOTsforPORVs,whenintheLowTemperatureRCSOverpressureProtectionRange,arerecommendedbytheNRCstafftoincreaseLTOPavailabilityandtherebyenhancesafety.ForCombustionEngineeringplants,guidanceforsuchimprovementsiscontainedinGL90-06,EnclosureB.ConsideringtheplantspecificdesignofSt.LucieUnit1,theproposedchangestoTS3/4.4.13areconsistentwithGL90-06,AppendixB.Inaddition,TShavebeenimplementedwhichlimitmassandenergyinputstotheRCSbyrestrictingsafetyinjectionpumpoperabilityandplacingrestrictionsondifferentialtemperatureforRCPrestart.Therefore,FPLconsiderstheproposedamendmenttobeacceptable.
-St.LucieUnit1DocketNo.50-335ProposedLicenseAmendmentDEZZZMINATIONOFNOSIGNIFICANTHAZARDSCONSIDERATION St.LucieUnit1DocketNo.50-335ProposedLicenseAmendmentLTOPReuirementsforPower0cratedReliefValvesGL90-06L-94-153Attachment3Page1of2DETERMINATIONOFNOSIGNIFICANTHAZARDSCONSIDERATIONPursuantto10CFR50.92,adeterminationmaybemadethataproposedlicenseamendmentinvolvesnosignificanthazardsconsiderationifoperationofthefacilityinaccordancewiththeproposedamendmentwouldnot:(1)involveasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviouslyevaluated;or(2)createthepossibilityofanewordifferentkindofaccidentfromanyaccidentpreviouslyevaluated;or(3)involveasignificantreductioninamarginofsafety.Eachstandardisdiscussedasfollows:(1)Operationofthefacilityinaccordancewiththeproposedamendmentwouldnotinvolveasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviouslyevaluated.ThechangesproposedforSt.LucieUnit1TechnicalSpecifications(TS)3/4.4.13aresimilartothoserecommendedbytheNRCstaffviaGenericLetter90-06forLowTemperatureOverpressureProtection(LTOP)systems.OnthebasisoftechnicalstudiesperformedforGenericIssue94,thestaffconcludedthatLTOPsystemunavailabilityisacontributortotheriskassociatedwithoverpressuretransientsduringtheshutdownmodesofplantoperation.Revisionstotheactionsrequiredandthetimeforcompletionofsuchactions,intheeventthatoneormorePowerOperatedReliefValves(PORV)becomeinoperable,providemorerigorthantheexistingspecificationsandaredesignedtoincreaseLTOPsystemavailability.TheadministrativerestrictionsdonotchangetheresultsofexistinganalysesperformedtoevaluatepostulatedaccidentsbutwillimprovetheavailabilityofsystemsdesignedtomitigatepressuretransientsthatcouldoccurwithintheLTOPrange.Therefore,operationofthefacilityinaccordancewiththeproposedamendmentwillnotinvolveasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviouslyevaluated.(2)Operationofthefacilityinaccordancewiththeproposedamendmentwouldnotcreatethepossibilityofanewordifferentkindofaccidentfromanyaccidentpreviouslyevaluated.Theproposedamendmentwillnotchangethephysicalplantorthemodesofoperationdefinedinthefacilitylicense.Thechangesdonotinvolvetheadditionofnewequipmentorthemodificationofexistingequipment,nordotheyalterthedesignofSt.Lucieplant SgI St.LucieUnit1DocketNo.50-335ProposedLicenseAmendmentLTOPReirementsforPower0cratedReliefValvesGL90-06L-94-153Attachment3Page2of2systems.Therefore,operationofthefacilityinaccordancewiththeproposedamendmentwouldnotcreatethepossibilityofanewordifferentkindofaccidentfromanyaccidentpreviouslyevaluated.(3)Operationofthefacilityinaccordancewiththeproposedamendmentwouldnotinvolveasignificantreductioninamarginofsafety.TheproposedamendmentprovidesadditionaladministrativerestrictionsfortheoperationofLTOPequipment.TheapplicabilityofLimitingConditionsforOperation(LCO)involvingthePORVswillbeextendedtoincludeOperationalMODE6whentheheadisonthereactorvessel,andtherigorofrequiredactionsandactioncompletiontimesintheeventthatoneormorePORVsbecomeinoperablewillbeincreased.Consequently,theriskoflowtemperatureoperationswillbereducedandsafetyduringtheshutdownmodesofoperationwillbeenhanced.Therefore,operationofthefacilityinaccordancewiththeproposedamendmentwouldnotinvolveasignificantreductioninamarginofsafety.BasedonthediscussionpresentedaboveandonthesupportingEvaluationofProposedTSChanges,FPLhasconcludedthatthisproposedlicenseamendmentinvolvesnosignificanthazardsconsideration.