ML17264A578

LER 96-008-00:on 960707,main Feedwater Pump Breakers Opened. Caused by Change in Seal Water Differential Pressure Occurred During Sys Realignment.Afw Flow Controlled as Desired to Maintain S/G level.W/960806 Ltr

ML17264A578
Person / Time
Site:	Ginna
Issue date:	08/06/1996
From:	MECREDY R C, ST MARTIN J T ROCHESTER GAS & ELECTRIC CORP.
To:	VISSING G S NRC (Affiliation Not Assigned), NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-96-008, LER-96-8, NUDOCS 9608120049
Download: ML17264A578 (13)

Text

t'A.'j:EUUKXJ.REGULATOINFORMATIONDISTRIBUTIONSTEM(RIDS)ACCESSIONNBR:9608120049DOC.DATE:96/08/06NOTARIZED:NODOCKETFACIL:50-244RobertEmmetGinnaNuclearPlant,Unit1,RochesterG05000244AUTH.NAMEAUTHORAFFILIATIONST.MARTIN,J.T.RochesterGas6ElectricCorp.MECREDY,R.C.RochesterGasaElectricCorp.RECIP.NAMERECIPIENTAFFILIATIONVISSINGEG.S.DocumentControlBranch(DocumentControlDesk)

SUBJECT:

LER96-008-00:on960707,mainfeedwaterpumpbreakersopened.Causedbychangeinsealwaterdifferentialpressurethatoccurredduringsysrealignment.Stabilizedauxiliaryfeedwaterflowtobothsteamgenerators.W/960806ltr.DISTRIBUTIONCODE:IE22TCOPIESRECEIVED:LTRLENCLJSIZE:TITLE:50.73/50.9LicenseeEventReport(LER),IncidentRpt,etc.TEIGNOTES:LicenseExpdateinaccordancewith10CFR2,2.109(9/19/72).05000244INTERNALRECIPIENTIDCODE/NAMEPD1-1PDFETERNRR/DE/EELBNRR/DRCH/HHFBNRR/DRCH/HOLBNRR/DRPM/PECBNRR/DSSA/SRXBRGN1FILE01COPIESLTTRENCL112211111111111111RECIPIENTIDCODE/NAME.VISSING,G.AEOD/SPD/RRABNRR/DE/ECGBNRR/DE/EMEBNRR/DRCH/HICBNRR/DRCH/HQMBNRR/DSSA/SPLBRES/DSIR/EIBCOPIESLTTRENCL111111111111111'YtD0)EXTERNAL:LSTLOBBYWARDNOACMURPHY,G.ANRCPDR111111LITCOBRYCE,JHNOACPOORE,W.NUDOCSFULLTXT221111UE.NNOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMOWFNSD-5(EXT.415-2083)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!FULLTEXTCONVERSIONREQUIREDTOTALNUMBEROFCOPIESREQUIRED:LTTR25ENCL25 0

ANDcAtit,ROCHESTERGASAIDEIECTRICCORPORATION~89EASTA'i'EIVUE,ROHESTER,MYIdo-'9-0%1~i"AREACODE74~Sdrt-27&9ROBERTC.MECREDYVicePresiaenttrvcieorOperotionsAugust6,'1996U.S.NuclearRegulatoryCommissionDocumentControlDeskAttn:GuyS.VissingProjectDirectorateI-1Washington,D.C.20555

Subject:

LER96-008,MainFeedwaterPumpBreakersOpen,DuetoLowSealWaterDifferentialPressure,ResultsinAutomaticStartofAuxiliaryFeedwaterPumpR.E.GinnaNuclearPowerPlantDocketNo.50-244Inaccordancewith10CFR50.73,LicenseeEventReportSystem,item(a)(2)(iv),whichrequiresareportof,"Anyeventorconditionthatresultedinamanualorautomaticactuationofanyengineeredsafetyfeature(ESF),includingthereactorprotectionsystem(RPS)",theattachedLicenseeEventReportLER96-008isherebysubmitted.Thiseventhasinnowayaffectedthepublic'shealthandsafety.Verytrulyyours,'"C(.L.-RobertC.Mecrexc:U.S.NuclearRegulatoryCommissionMr.GuyS.Vissing(MailStop14C7)PWRProjectDirectorateI-1Washington,D.C.20555U.S.NuclearRegulatoryCommissionRegionI475AllendaleRoadKingofPrussia,PA19406U.S.NRCGinnaSeniorResidentInspector9608i2004'st960806PDRADQCK050002448PDR I

NRCFORIVI366(4-95)U.S.CLEARREGULATORYCOMMISSIOLICENSEEEVENTREPORT(LER)(Seereverseforrequirednumberofdigits/charactersforeachblock)AOVEDBYOMBNO.3150-0104EXPIAES04/30/98ESTIMATEDBURDENPERRESPONSEToCOMPLYWITHTHISMANDATORYINFOAMATIONCOLLECTIONREQUEST:50.0HAS.REPORTEDLESSONSLEARNEDAREINCORPORATEDINTOTHELICENSINGPROCESSANDFEDBACKToINDUSTAY.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMANAGEMENTBRANCH(T-6F33),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555.000),ANDTOTHEPAPERWOAKREDUCTIONPROJECTFACILnYNAMEll)R.E.GinnaNuclearPowerPlantDOCKET)IVMSER)2)05000244FAosI3)1OF6TITLE(4)MainFeedwaterPumpBreakersOpen,DuetoLowSealWaterDifferentialPressure,ResultsinAutomaticStartofAuxiliaryFeedwaterPumpMONTHDAYYEAR070796EVENTDATE(5)LERNUMBER(6)SEQUENAALREVISIONNUMBERNUMBER96-008-00REPORTDATE(7)MONTHDAYYEAR080696FACIUTYNAMEFACIUTYNAMEOTHERFACILITIESINVOLVED(8)DOCKET)IUMBDIDOCKET))UMBEROPERATINGMODE(9)POWERLEVEL(10)00020.2201(b)20.2203(a)(1)20.2203(a)(2)(I)20.2203(a)(2)(ii)20.2203(a)(2)(iii)20.2203(a)(2)(iv)20.2203(a)(2)(v)20.2203(a)(3)(i)20.2203(a)(3)(ii)20.2203(a)(4)50.36(c)(1)50.36(c)(2)50.73(a)(2)(i]50.73(a)(2)(ii)50.73(a)(2)(iii)50.73(a)(2)(iv)50.73(a)(2)(v)50.73(a)(2)(vii)50.73(a)(2)(viii)50.73(a)(2)(x)73.71OTHERSpecrfyInAbstractbeloworinNRCForm366ALICENSEECONTACTFORTHISLER(12)THISREPORTISSUBMITTEDPURSUANTTOTHEREQUIREMENTSOF10CFR5:(Chockoneormore)(11)rrAMsTELEPHONENUMBER(InoludeAresCoda)JohnT.St.Martin-TechnicalAssistant(716)771-3641COMPLETEONELINEFOREACHCOMPONENTFAILUAEDESCRIBEDINTHISREPORT(13)CAUSESYSTEMCOMPONENTMANUFACTVAEAAEPOATABLETONPADSCAUSESYSTEMCOMPONENTMANUFACTURERREPORTABLETONPADSSUPPLEMENTALREPORTEXPECTED(14)YES(IfYas,completeEXPECTEDSUBMISSIONDATE).XNOEXPECTEDSUBMISSIONDATE(15)MONTHDAYYEARABSTRACT(Limitto1400spaces,i.e.,approximately15single.spacedtypewrittenlines)(16)OnJuly7,1996,atapproximately1930EDST,theplantwasinMode3withthereactorcoolantsystembeingmaintainedatatemperatureof547degreesFandapressurizerpressureof2235PSIG.Thecondensateandmainfeedwater(MFW)systemswerebeingrealignedfrom"CleanupRecirculation"tothenormalat-powerlineup.LowMFWpumpsealwaterdifferentialpressureoccurredduringthisrealignment,whichcausedthebreakerforthe"A"MFWpumptoopen.SincetheotherMFWpumpbreakerwasalreadyopen,thiscreatedlogic(bothMFWpumpbreakersopen)forautostartofthe"B"motor-drivenauxiliaryfeedwaterpump.Immediateactionwastostabilizeauxiliaryfeedwaterflowtobothsteamgenerators.Theunderlyingcauseoftheautostartwasthatthelogicforautostartwascreatedbytheopeningofthe"A"MFWpumpbreaker.ThiseventisNUREG-1022CauseCode(E).CorrectiveactiontopreventrecurrenceisoutlinedinSectionV.B.NACFOAM366(495)

NRCFORM366A(4-95).S.NUCLEARREGULATORYCOMMISSIONFACILITYNAME(1)LICENSEEEVENTREPORT(LER)TEXTCONTINUATIONDOCKETLERNUMBER(6)PAGE(3)R.E.GinnaNuclearPowerPlant05000244YEARSEQUENTIALREVISIONNUMBERNUMBER96-008-002OF6TEXT/ffmorespaceisrequired,useadditionalcopiesofNRCForm386A/(17)PRE-EVENTPLANTCONDITIONS:OnJuly7,1996,theplantwasinMode3asaresultofplantshutdowntoreplacealeakingpressurizer(PRZR)safetyvalve.Afterthesafetyvalvewasreplaced,plantheatupandstartupwasinitiated,andwasinprogress.Thereactorcoolantsystem(RCS)wasbeingmaintainedatatemperatureofapproximately547degreesFandaPRZRpressureofapproximately2235PSIGinpreparationforamodechangetoMode2.The"A"motor-drivenauxiliaryfeedwater(AFW)pumpwasoperatingtomaintainwaterinventoryinbothsteamgenerators(S/G)usingtheflowpaththroughcross-connectvalve4000A,andthe"B"motor-drivenAFWpumpwasnotoperating.Thecircuitbreakerforthe"A"mainfeedwater(MFW)pumphadjumpersinstalledandwasclosedinthe"test"position,tocomplywithtemporaryadministrativerequirements.TheControlRoomoperatorswereintheprocessofrealigningthecondensateandMFWsystemsfromthelineupusedfor"CleanupRecirculation"ofthesesystemstothenormalat-powerlineup.Whenin"CleanupRecirculation"thereiscondensateflowtothehotwellwhichprovidesadifferentialpressure(D/P)betweenthecondensatepumpdischargeandtheMFWpumpsuction.Whenrealigningtothenormalat-powerlineupwithoutMFWflow,theD/Pmaydecreasetozeroduringtherealignment.Atapproximately1929EDSTonJuly7,1996,MFWpumpsealwaterD/Pdecreasedbelowthealarmsetpointof15PSID.ThisresultedinanalarmfromMainControlBoard(MCB)AnnunciatorH-11"FeedPumpSealWaterLoDiffPress15PSI".TheControlRoomoperatorsreferredtoAlarmResponseProcedureAR-H-11,but,sincenoMFWpumpswereoperating,noactionswererequired.DESCRIPTIONOFEVENT:A.DATESANDAPPROXIMATETIMESOFMAJOROCCURRENCES:July7,1996,1929EDST:MainControlBoardAnnunciatorH-11alarms.July7,1996,1930EDST:Thebreakerforthe"A"MFWpumpopens.July7,1996,1930EDST:Eventdateandtime.July7,1996,1930EDST:Discoverydateandtime.July7,1996,1953EDST:¹1Asealwaterboosterpumpisstarted.AnnunciatorH-11clears.oJuly7,1996,2003EDST:ThesecondrunningAFWpumpissecured.NACFOAM366A(4.95)

I,I NRCFORM366AI4.95)LICENSEEEVENTREPORT(LER)TEXTCONTINUATION.S.NUCLEARREGULATORYCOMMISSIONFACILITYNAMEI1)R.E.GinnaNuclearPowerPlantDOCKET05000244LERNUMBERI6)YEARSEQUENTIALREVISIONNUMBERNUMBER96-008-00PAGEI3)3OF6TEXTllfmorespaceisrequired,useadditionalcopiesofNRCFormMGA/I17)B.EVENT:OnJuly7,1996,atapproximately1930EDST,theplantwasinMode3.MCBAnnunciatorH-11wasinthealarmcondition.Asperdesign,the"A"MFWpumpcircuitbreakertrippedopenapproximatelysixty(60)secondsafterreceiptofAnnunciatorH-11.WithbothMFWpumpbreakersopen,thereisa2of2logicfortheautostartsignalsuppliedtobothmotor-drivenAFWpumps.Sincethebreakerforthe"B"MFWpumpwasalreadyopen,the2of2logicwaspresent,whichcausedanautostartofthe"B"AFWpump.(The"A"AFWpumpalsoreceivedanautostartsignal,butwasalreadyoperating.)TheControlRoomoperatorsobservedtheautostartofthe"B"AFWpump,andcontrolledAFWflowtothedesiredflowrateforMode3conditions.Atapproximately1953EDST,the¹1Asealwaterboosterpumpwasmanuallystarted,whichincreasedthesealwaterD/Pabove15PSID.ThisclearedthealarmconditionforAnnunciatorH-11,whichallowedtheMFWpumpbreakertobeclosedinthetestposition,aspertemporaryadministrativerequirements.Whenthebreakerwasclosed(intest),theautostartsignalfortheAFWpumpswasremoved.Subsequently,thesecondrunningAFWpumpwassecuredatapproximately2003EDST.C.INOPERABLESTRUCTURES,COMPONENTS,ORSYSTEMSTHATCONTRIBUTEDTOTHEEVENT:NoneD.OTHERSYSTEMSORSECONDARYFUNCTIONSAFFECTED:NoneE.METHODOFDISCOVERY:Thiseventwasimmediatelyapparentwhenthe"B"AFWpumpautostarted60secondsafterreceiptofMCBAnnunciatorH-11.Theautostartofthe"B"AFWpumpwasanexpectedresponsetobothMFWpumpbreakersbeingopen.F.OPERATORACTION:WhenAnnunciatorH-11alarmed,theControlRoomoperatorsreferredtoprocedureAR-H-11.Afterthe"B"AFWpumpautostarted,theytookpromptactionstocontrolAFWflow.TheControlRoomoperatorssubsequentlynotifiedhighersupervisionandnotifiedtheNRCper10CFR50.72(b)(2)(ii),non-emergencyfourhournotification,atapproximately2218EDSTonJuly7,1996.NRCFORM366AI4-95)

NRCFORiVI366A<4.95)LICENSEEEVENTREPORT(LER)TEXTCONTINUATION.S.NUCLEARREGULATORYCOMMISSIONFACILITYNAMEI1)R.E.GinnaNuclearPowerPlantDOCKET05000244LERNUMBERI6)YEARSEQUENTIALREVISIONNUMBERNUMBER96-008-00PAGEI3)TEXT(lfmorespeceisrequired,useeddilionelcopiesofNRCForm388A/(17)G.SAFETYSYSTEMRESPONSES:The"B"AFWpumpautostartedasperdesignduetobothMFWpumpbreakersbeingopen.(The"A"AFWpumpalsoreceivedanautostartsignal,butwasalreadyoperating.)III.CAUSEOFEVENT:A.IMMEDIATECAUSE:Theimmediatecauseoftheautostartofthe"B"AFWpumpwasbothMFWpumpbreakersopen,duetotrippingopenthe"A"MFWpumpbreaker.B.INTERMEDIATECAUSE:Theintermediatecauseoftrippingopenthe"A"MFWpumpbreakerwasa60secondtimedelayduetolowsealwaterD/P.Asystemrealignmentwasinprogress,andlowsealwaterD/Pmayoccurduringthisrealignment.C.ROOTCAUSE:TheunderlyingcauseoftheMFWpumpbreakertrippingopenwasachangeinsealwaterdifferentialpressurethatoccurredduringsystemrealignment.ThisultimatelyresultedintheundesiredopeningofaMFWpumpbreaker.ThissituationwascreatedtobeincompliancewiththeGinnaStationImprovedTechnicalSpecifications(ITS)Table3.3.2-1Function6.f.TopreventanunnecessaryactuationofbothAFWpumpsduringMode2conditions,aMFWpumpbreakermaybeadministrativelyclosedinthetestposition,provideditiscapableofbeingtrippedonundervoltageandovercurrentconditions.ThiseventisNUREG-1022CauseCode(E),"Management/QualityAssuranceDeficiency"~TheadministrativerequirementswereestablishedtocomplywithITSTable3.3.2-1,whichrequirestheautostartfunctionofthemotor-drivenAFWpumpuponopeningofbothMFWpumpbreakersduringModes1and2.PriortoAmendmentNo.61totheITS,thisfunctionwasonlyrequiredinMode1whentheMFWpumpswereactuallyinservice.TheadditionofMode2(whentheMFWpumpsmaynotbeinservice)wasinadvertentlyaddedtotheITSbyAmendmentNo.61.TheautostartoftheAFWpumpdoesnotmeettheNUMARC93-01,"IndustryGuidelineforMonitoringtheEffectivenessofMaintenanceatNuclearPowerPlants",definitionofa"MaintenancePreventableFunctionalFailure".NRCFORM366AI4-95)

NRCFORM366AI4-95)LICENSEEEVENTREPORT(LER)TEXTCONTINUATION.S.NUCLEARREGULATORYCOMMISSIONFACILITYNAMEI1)R.E.GinnaNuclearPowerPlantDOCKET05000244LERNUMBERI6)YEARSEQUENTIALREVISIONNUMBERNUMBER96-008-00PAGEI3)5OF6TEXTllfmorespaceisrequired,useadditionelcopiesofNRCForm366A/(17)IV.ANALYSISOFEVENT:Thiseventisreportableinaccordancewith10CFR50.73,LicenseeEventReportSystem,item(a)(2)(iv),whichrequiresareportof,"Anyeventorconditionthatresultedinamanualorautomaticactuationofanyengineeredsafetyfeature(ESF),includingthereactorprotectionsystem(RPS)".ThestartofanAFWpumpisanactuationofanESF.Anassessmentwasperformedconsideringboththesafetyconsequencesandimplicationsofthiseventwiththefollowingresultsandconclusions:Therewerenooperationalorsafetyconsequencesorimplicationsattributedtotheautostartofthe"B"AFWpumpbecause:oTheautostartofthe"B"AFWpumpoccurredwiththe"A"AFWpumpalreadyoperatingandwithacceptablelevelsinbothS/Gs.AFWflowwascontrolledtomaintaintheselevels.oThelimitingcaseforthesupplyofAFWistheLossofFeedwateraccidentat100%power.Theplantconditionatthetimeofthiseventwaslessthan5%powerwithfeedwaterbeingsuppliedbythe"A"AFWpump,sotherewasnolossoffeedwaterevent.Basedontheabove,itcanbeconcludedthatthepublic'shealthandsafetywasassuredatalltimes.V.CORRECTIVEACTION:A.ACTIONTAKENTORETURNAFFECTEDSYSTEMSTOPRE-EVENTNORMALSTATUS:oAFWflowwascontrolledasdesiredtomaintainS/Glevel.oThe¹1AsealwaterboosterpumpwasstartedtoprovideaD/PfortheMFWpumps.oThesecondrunningAFWpumpwassecured.B.ACTIONTAKENORPLANNEDTOPREVENTRECURRENCE:TheITSwillberevisedtoeliminatetheneedforhavingaMFWpumpbreakerclosedinthetestpositionduringMode2conditions.UntiltheITSarerevised,thetemporaryadministrativecontrols(forinstallingjumpersandclosingaMFWpumpbreakerinthetestposition)willbereevaluated.NRCFORM366AI4.95)

Ii NRCFORM366AI4-95)LICENSEEEVENTREPORT(LER)TEXTCONTINUATION.S.NUCLEARREGULATORYCOMMISSIONFACILITYNAMEI1)R.E.GinnaNuclearPowerPlantDOCKET05000244LERNUMBERI6)ARSEQUENTIALREVISIONNUMBERNUMBER96-008-00PAGEI3)6OF6TEXTllfmorespaceisrequired,useadditionalcopiesofNRCForm366AJI17)VI.ADDITIONALINFORMATION:A.FAILEDCOMPONENTS:NoneB.PREVIOUSLERsONSIMILAREVENTS'similarLEReventhistoricalsearchwasconductedwiththefollowingresults:NodocumentationofsimilarLEReventswiththesamerootcausecouldbeidentified.C.SPECIALCOMMENTS:NoneNRCFQRM366AI4-95)