ML17301A001

ECCS Repts (F-47),TMI Action Plan Requirements,St Lucie Unit 1, Technical Evaluation Rept

ML17301A001
Person / Time
Site:	Saint Lucie
Issue date:	09/28/1982
From:	LUDINGTON B W, OVERBECK G J, VOSBURY F W FRANKLIN INSTITUTE
To:	CHOW E NRC
Shared Package
ML17214A397	List: ML17301A001
References
CON-NRC-03-81-130, CON-NRC-3-81-130, RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.17, TASK-TM TER-C5506-296, NUDOCS 8210010343
Download: ML17301A001 (14)

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TECHNICALEVALUATIONREPORTEGGSREPORTS(F-47)TMIACTIONPLANREQUIREMENTSFLORIDAPOMERANDLIGHTCONPANYSTLUCIEUNIT1NRCOOCKETNO.50-335NRCCONTRACTNO.NRC43%1-130FRCPROJECTC59$FRCASSIGNMENT7FRCTASK296PreperedbyFranklinResearchCenter20thandRaceStreetsPhiladelphia,PA19103PreperedforNuclearRegulatoryCommissionWashington,D.C.20555Z.W-VosburyAuthor'~J.OverbeckB.W.LudingtonFRCGroupLeader:G.J.OverbeckLeadNRCEngineer:E.ChowSeptember28,1982XACopyHasBeenSenffoPDRThisreportwaspreparedasanaccountofworksponsoredbyanagencyoftheUnitedStatesGovernment.NeithertheUnitedStatesGovernmentnoranyagencythereof.oranyoftheiremployees,makesanywarranty,expressedorImplied,orassumesanylegalliabilityorresponsibilityforanythirdparty'suse,ortheresultsofsuchuse,ofanyInformation,appa-ratus,productorprocessdisclosedInthis.report,orrepresentsthatItsusebysuchthirdpartywouldnotInfringeprivatelyownedrights.Reviewedby:Approvedby:PrincipalAutDate:GroupLeaderD.te:DepartmentDlrecrDate:OFranklinResearchcenterADivisionofTheFranklininstituteWeSenlarninFranMlnParkway,Phile.,Pa.19103(215)4481000 TERM5506-296SectionTitleParcae1INTRODUCTION1.1PurposeofReview.l.2GeneticBackground.1.3Plant-SpecificBackground.2REVLEWCRITERIA3TECHNICALEVALUATION11~2~33.1ReviewofCompletenessoftheLicensee'sReport3.2ComparisonofECCSystemOutageswithThoseofOtherPlants.3.3ReviewofProposedChangestoImprovetheAvailabilityofECCZguipment.CONCLUSIONS~~~~~~~~~458~9REPERENCES~e~~~e~~~10(illFranklinResenrehCenterADlvbkedTheFra@Onkaatute TER-C5506296ThisTechnicalEvaluationReportwaspreparedbyFranklinResearchCenterunderacontractwiththeU.S.NuclearRegulatoryCommission(OfficeofNuclearReactorRegulation,DivisionofOperatingReactors)fortechnicalassistanceinsupportofNRCoperatingreactorlicensingactions.ThetechnicalevaluationwasconductedinaccordancewithcriteriaestablishedbyItheNRC.-Mr-Q.JOverheck,-MrZ..NVosbury.,andMrBWLudingtoncontributedtothetechnicalpreparationofthisreportthroughasubcontractwithWESTECServices,Inc.IjtlFranklinResearchCenterAGMsiond%heFtanldtnInstitute TERW5506-296loINTRODUCTION1+1PURPOSEOPREVIEWThistechnicalevaluationreport(TER)documentsanindependentreviewoftheoutagesoftheemergencycorecooling(ECC)systemsatPloridaPowerandLightCompany's(PPL)St.LucieUnit1.ThepurposeofthisevaluationistodetermineiftheLicenseehassubmittedareportthatiscompleteandsatisfiestherequirementsofTNZActionItemZZ.K.3.17,"ReportonOutagesofEmergencyCore-CoolingSystemsLicenseeReportandProposedTechnicalSpecificationChanges."1o2GENERICBACKGROUNDFollowingtheThreeMileZslandUnit2accident,theBulletinsandOrdersTaskForcereviewednuclearsteamsupplysystem(NSSS)vendors'mallbreakloss-of-coolantaccident(LOCA)analysestoensurethatanadequatebasisexistedfordevelopingguidelinesforsmallbreakLOCAemergencyprocedures.Duringthesereviews,aconcerndevelopedabouttheassumptionoftheworstsinglefailure.Typically,thesmallbreakLOCAanalysisforboilingwaterreactors(BWRs)assumedalossofthehighpressurecoolantinjection(HPCZ)systemastheworstsinglefailure.However,thetechnicalspecificationspermittedplantoperationforsubstantialperiodswiththeHPCIsystemoutofservicewithnolimitontheaccumulatedoutagetime.ThereisconcernnotonlyabouttheHPCZsystem,butalsoaboutallECCsystemsforwhichsubstantialoutagesmightoccurwithinthelimitsofthepresenttechnicalspecification.Therefore,toensurethatthesmallbreakLOCAanalysesareconsistentwiththeactualplantresponse,theBulletinandOrdersTaskPorcerecommendedinNUREG-0626[1]>"GenericEvaluationofPeedwaterTransientsandSmallBreakLoss-of-CoolantAccidentsinGE-DesignedOperatingPlantsandNear-TermOperatingLicenseApplications,"thatlicenseesofGeneralElectric(GE)MesignedNSSSsdothefollowing:"SubmitareportdetailingoutagedatesandlengthsoftheoutagesforallECCsystems.Thereportshouldalsoincludethecauseoftheoutage(e.g.,controllerfailureorspuriousisolation).TheoutagedataforECCcomponentsshouldincludealloutagesforthelastfiveyearsoftill!IFranklinResearchCenterhO&swnolTheFranldinInsotu>c TERM5506-296operation.Theendresultshouldbethequantificationofhistoricalunreliabilityduetotestandmaintenanceoutages.Thiswillestablishifaneedexistsforcumulativeoutagerequirementsintechnicalspecifications.'atertherecommendationwasincorporatedintoNUREG-0660[2],"NRCActionPlanDevelopedasaResultoftheTMI-2Accident,"forallGE-designedNSSSsasTNIActionItemII.K.3.17.InNUREG-0737[3],"Clarificationof'INIActionPlanRequirements,"theNRCstaffexpandedtheactionitemtoincludealllightwaterreactorplantsandaddedarequirementthatlicenseesproposechangesthatwillimproveandcontrolavailabilityofECCsystemsandcomponents.Inaddition,thecontentsofthereportstobesubmittedbythelicenseeswerefurtherclarifiedasfollows:"Thereportshouldcontain(1)outagedatesanddurationofoutages;(2)causeoftheoutageg(3)ECCsystemsorcomponentsinvolvedintheoutagegand(4)correctiveactiontaken."13PLANT-SPECIPICEACKGRDUNDOnJanuary2,1981[4],PPLsubmittedareportinresponsetoNUREG-0737,ItemII.K.3.17,"ReportonOutagesofEmergencyCore-CoolingSystemsLicenseeReportandProposedTechnicalSpecificationChanges."ThereportsubmittedbyPPLcoveredtheperiodfromMarch1,1976toOctober31,1980fortheSt.LucieUnit1.PPLdidnotproposeanychangestoimproveorcontrolECCsystemavailability.(ll!FranklinResearchCenterADivelenB%heFrsnldlnInstaute TERW5506-2962oREVIEWCRITERIATheLicensee'sresponsetoNUREG-0737'temII.K.3~17,wasevaluatedagainstcriteriaprovidedbytheNRCinaletterdatedJuly21,1981[5],outliningTentativeWorkAssignmentP.Providedasreviewcriteriain.Reference5,theNRCstatedthattheLicensee'sresponseshouldcontainthefollowinginformation:l.Areportdetailingoutagedates,causesofoutages,andlengthsofoutagesforallECCsystemsforthelast5yearsofoperation.ThisreportwastoincludetheECCsystemsorcomponentsinvolvedandcorrectiveactionstaken.Testandmaintenanceoutagesweretobeincluded.2.AquantificationofthehistoricalunavailabilityoftheECCsystemsandcomponentsduetotestandmaintenanceoutages.3.ProposedchangestoimprovetheavailabilityofECCsystems,ifnecessary.ThetypeofinformationrequiredtosatisfythereviewcriteriawasclarifiedbytheNRConAugust12,1981[6].AuxiliarysystemssuchascomponentcoolingwaterandplantservicewatersystemswerenottobeconsideredindeterminingtheunavailabilityofECC'systems.OnlytheoutagesofthedieselgeneratorsweretobeincludedalongwiththeprimaryECCsystemoutages.Finally,the"lastfiveyearsofoperation"wastobelooselyinterpretedasacontinuous5-yearperiodofrecentoperation.OnJuly26,1982[7],theNRCfurtherclarifiedthatthepurposeofthereviewwastoidentifythoselicenseesthathaveexperiencedhigherECCsystemoutagesthanotherlicenseeswithsimilarNSSSs.TheneedforimprovedreliabilityofdieselgeneratorsisunderreviewbytheNRC.ADieselGeneratorInterimReliabilityProgramhasbeenproposedtoeffectimprovedperformanceatoperatingplantsAsaconsequence,acomparisonofdieselgeneratoroutageinformationwithinthisreviewisnotrequired.~AIJ(lFranMinResearchCenterADlvhionofTheFranklinInsome TER-C5506-2963TECHNICALE%iLUATION3~1REVZENOFCOMPLETENESSOPTHELICENSEE'SREPORTTheECCsystemsatPPL'sSt.LucieUnit1consistofthefollowingfourseparatesystems:o.safetyinjection(SI)tankohighpressuresafetyinjection(HPSZ)systemolowpressuresafetyinjection(LPSI)systemorefuelingwaterstoragetank(RWST).InReference4,FPLalsoincludedsystemsandcomponentsthatsupportthe..ZCC.systems.hn.carrying..out..their.design..functions.under.variousaccideatconditions.Thesupportsystemsare:ocontainmentsprayostandbydieselgeneratorsocomponentcoolingwateroauxiliaryfeedwatersystem.InestablishingthetypeofeventsthatconstituteanECCsystemoutage,FPLconsidexedanoutagetobeanyeventthatrenderedanECCsystemunabletorespondduringplantconditionsforwhichtechnicalspecificationsrequiredECCsystemoperability.ForeachECCsystemoutageevent,PPLprovidedtheoutagedates,theduration,andthecause,plussufficientdescriptiontodiscernthecorrectiveactiontaken.MaintenanceandsurveillancetestingactivitieswereincludedintheECCsystemoutagedata,unlesstheseactivitieswereperformedduringashutdownconditioninwhichtheaffectedECCsystemwasnotrequiredtobeopex'ational.TheresultsofFPL'sreviewwereprovidedfortheperiodfromMarch1,1976toOctober31,1980fortheSt.LucieUnitl.Basedontheprecedingdiscussion,ithasbeenestablishedthatFPLhassubmittedareportwhichfulfillstherequirementsofreviewcriterion1withoutexception.t)llFranklinResearchCenterAOiwionolTheFrau4nlnseatc TERM5506-29632COMPARISONOFECCSYSTEMOUTAGESWITHTHOSEOFOTHERPLANTSTheoutagesofECCsystemscanbecategorizedas(1)unplannedoutagesduetoequipmentfailureor(2)plannedoutagesduetosurveillancetestingorpreventivemaintenance.UnplannedoutagesarereportableasLicenseeEventReports(LERs)underthetechnicalspecifications.PlannedoutagesforperiodicmaintenanceandtestingarenotreportableasLERs.ThetechnicalspecificationsidentifythetypeandquantityofECCequipmentrequiredaswellasthemaximumallowableoutagetimes.Ifanoutageexceedsthemaximumallowabletime,thentheplantoperatingmodeisalteredtoalowerstatusconsistentwiththeavailableECCsystemcomponentsstilloperational.ThepurposeofthetechnicalspecificationmaximumallowableoutagetimesistopreventextendedplantoperationwithoutsufficientECCsystemprotection.ThemximumallowableoutageCime,specified~event,tendstolimittheunavailabilityofanECCsystem.However,thereisnocumulative.outagetimelimitationtopreventrepeatedplannedandunplannedoutagesfromaccumulatingextensiveECCsystemdowntime.Unavailability,asdefinedingeneraltermsinWASH>>1400(8],istheprobabilityofasystembeinginafailedstatewhenrequired.However,forthisreview,adetailedunavailabilityanalysiswasnotrequired.Instead,apreliminaryestimateoftheunavailabilityofanECCsystemwasmadebycalculatingtheratiooftheECCsystemdowntimetothenumberofdaysthattheplantwasinoperationduiingthelast5years.Tosimplifythetabulationofoperatingtime,onlytheperiodwhentheplantwasinoperationalMode1wasconsidered.Thissimplifyingassumptionisreasonablegiventhattheperiodoftimethataplantisstartingup,shuttingdown,andcoolingdownissmallcomparedtothetimeitisoperatingatpower.Inaddition,anECCsystemwasconsidereddownwheneveranECCsystemcomponentwasunavailableduetoanycause.ItshouldbenotedthattheratiocalculatedinthismannerisnotatruemeasureoftheECCsystemunavailability,sinceoutageeventsareincludedthatappeartocompromisesystemperformancewhen,infact,partialorfullfunctionofthesystemwouldbeexpected.FullfunctionofanECCsystemtillFranklinResearchCenterA&visionoi~FranklinInsatute TERM5506-296wouldbeexpectedifthedesign'capabilityofthesystemexceededthecapacityrequiredforthesystemtofulfillitssafetyfunction.Forexample,ifanECCsystemconsistingoftwoloopswithmultiplepumpsineachloopisdesignedsothatonlyonepumpineachloopisrequiredtosatisfycorecoolingrequirements,thenanoutageofasinglepumpwouldnotpreventthe"systemfromperformingitssafetyfunction.Inaddition,theactualECCsystemunavailabilityisafunctionofplannedandunplannedoutagesofessentialsupportsystemsaswellasofplannedandunplannedoutagesofprimaryECCsystemcomponents.Znaccordancewiththeclarificat:iondiscussedinSection2,onlytheeffectsofoutagesassociatedwithprimaryECCsystemcomponentsandemergencydieselgeneratorsareconsideredinthisreview.TheinclusionofalloutageeventsassumedtobetrueECCsystemoutagestendstooverestimatetheunavailability,whiletheexclusionofsupportsystemoutagest:endstounderestimatetheunavailability,ofECCsystemsandcomponents.OnlyadetailedanalysisofeachECCsystemforeachplantcouldimprovetheconfidenceinthecalculatedresult.Suchananalysisisbeyondtheintendedscopeofthisreport.Theplannedandunplanned(forced)outagetimesforthefourECCsystems(SItank,HPSI,LPSZ,andRHST)andthestandbydieselgeneratorswereidentifiedfromtheoutageinformationinReference4andareshowninnumberofdaysandaspercentageofplantoperatingtimeperyearinTable1fortheSt.LucieUnitl.Outagesthatoccurredduringnonoperationalperiodswereeliminatedaswellasthosecaused.byfailuresortestan/maintenanceofsupportsystems.Dataonplantoperatingconditionswereobtainedfromtheannualreports,"NuclearPowerPlantOperatingExperience"[9-12],andfrommonthlyreports,"LicensedOperatingReactorsStatusSummaryReports"[13].TheremainingoutagesweresegregatedintoplannedandunplannedoutagesbasedonPPL'sdescriptionofthecausesTheoutageperiodsforeachcategorywerecalculatedbysummingtheindividualoutagedurations.ObservedoutagetimesofvariousECCsystemsatSt.LucieUnit1werecomparedwiththoseofotherPHRs.Basedonthiscomparison,itwasconcludedthatthehistoricalunavailabilityoftheSZtank,RWST,HPSZ,andLPSIsystemshasbeenconsistentwiththeperformanceofthosesystemsthroughout00FranklinResearchCenterARisenorTheFrsnl4nInsatwe Table1.PlannedandUnplanned(Porced)OutageTimesforSt.LucieUnit1SITankHPSIOutaeinDasForcedPlannedRWSTOutaeinDasLPSIOutaeinDasPorcedPlannedPorcedPlannedDieselGeneratorForcedPlanned1976CommercialOper.12/21/761977309.20.00.00.041.46(0.01%)(0'7%)0.0lo710.0(0'5%)0.0~6.021.83(1.95%)(0.59%)1978278.50.00.00.01421.58lo500.00.0(0~51%)(0.571)(0~54%)0'51.71(0.05%)(0'1%)1979269.60.10.0(0.04%)0.01.420.02o08000.0(0.53%)(0+77%)0.08(0'3'0)l.5(0~56%)1980288.20.00.00.01.421.92i+500.00.0(0'9%)(0.67l)(0'24)0.02,25~(0,78%)Total1145.50.10.0(0.01%)0.045.72F506'90.00.0(<0.01%)(0.50%)(0.3ll)=(0'9%)-~.6,25F29(0.55')(0.64%)*Humbersinparenthesesindicatesystemoutagetimeasapercentageoftotalplantoperatingtime.

TERW5506-296theindustry.Theobservedunavailabilitywaslessthantheindustrial,meanforSZtank,RWST,andHPSIsystemsandlessthanaboutonestandarddeviationabovetheindustrialmeanfortheLPSIsystem,assumingthattheunderlyingunavailabilityisdistributedlognormally.Theoutagetimeswerealsoconsistentwithexistingtechnicalspecif'ications.3.3REVIEWOPPROPOSEDCHANGESTOIMPROVE'ITHEAVAILABILITYOPECCEQUIPMENT'IInReference4,PPLdidnotproposeanychangestoimprovetheavailabilityofECCsystemsandcomponents.9I!FranklfnResearchCenterA5vtsendIhtfrsnldnhsacute TERM5506-2964CONCLUSIONSPloridaPowerandLightCompany(PPL)hassubmittedareportforSt.LucieUnit1thatcontains(1)outagedatesanddurationofoutages,(2)causesoftheoutages,(3)ECCsystemsorcomponentsinvolvedintheoutages,and(4)correctiveactionstaken.ItisconcludedthatPPLhasfulfilledtherequirementsofNUREG-0737,ItemIZ.K.3.17.Inaddition,thehistoricalunavailabilityoftheSItank,RWST,HPSI,andLPSIsystemshasbeenconsistentwiththeperformanceofthosesystemsthroughouttheindustry.TheobservedunavailabilitywaslessthantheindustrialmeanfortheSZtank,RWST,andHPSI'systemsandlessthanaboutonestandarddeviationabovetheindustrialmeanfortheLPSZsystem.Theoutagetimeswerealsoconsistentwithexistingtechnicalspecifications.tllIFranklinResearchCenter TERW5506-2965REPERENCESNUREG-0626"GenericEvaluationofPeedwaterTransientsandSmallBreakLoss~f-CoolantAccidentsinGE-DesignedOperatingPlantsandNear-TermOperatingLicenseApplications"NRC,January198024NUREG-0660"NRCActionPlanDevelopedasaResultoftheTMI-2Accident"NRC,March198030NUREG-0737"ClarificationofTMIActionPlanRequirements"NRC,October19804R.E.Uhrig(PPL).Letter',~D.QEisenhut.(Director,DivisionofLicensingNRC)SubjectiSubmittalofInformationRequiredbyNUREG-0737January2,19815.J.N.Donohew,Jr.(NRC)LettertoDr.S.P.Carfagno(PRC).

Subject:

ContractNo.NRC-03-81-130,TentativeAssignmentPNRC,July21,19816oNRCMeetingbetweenNRCandPRC.

Subject:

C5506TentativeWorkAssignmentP,OperatingReactorPORVandECCSOutageReports'ugust12,198170NRCMeetingbetweenNRCandPRC.

Subject:

ResolutionofReviewCriteriaandScopeofWork'uly26,1982WASH-1400"ReactorSafetyStudy"NRC,October19759.NUREG-0366"NuclearPowerPlantOperating'Experience1976"NRC,December197710.NUREG-0483NuclearPowerPlantOperatingExperience1977"NRC,Pebruary1979II'ranklinResearchCenterASusenotTheFnusSnIns~-10-TER-C5506-29611NUREG-0618"NuclearPowerPlantOperatingExperience1978"NRC,December197912NUREG/CR-1496"NuclearPowerPlantOperatingExperience1979"NRC,May198113NUREG-0020"LicensedOperatingReactorsStatusSummaryReport"Volume4,Nos.1through12,andVolume5,No.1NRC,December1980throughJanuary198199FranklinResearchCenterA&veenelTheFrankfinInsotuct