ML17264A591

LER 96-011-00:on 960807,improper Configuration of Circuit Breaker Occurred,Due to Undetected Internal Interference, Resulting in Automatic Start of Both Auxiliary Feedwater Pumps.Running AFW Pumps Were secured.W/960905 Ltr

ML17264A591
Person / Time
Site:	Ginna
Issue date:	09/05/1996
From:	MARTIN J T, MERCREDY R C ROCHESTER GAS & ELECTRIC CORP.
To:	VISSING G S NRC (Affiliation Not Assigned), NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-96-011, LER-96-11, NUDOCS 9609130028
Download: ML17264A591 (8)

Text

('A'19'(90RYjREGULARYINFORMATIONDISTRIBUTISYSTEM(RIDS)1ACCESSIONNBR:9609130028DOC.DATE:96/09/05NOTARIZED:NODOCKETFACIL:50-244RobertEmmetGinnaNuclearPlant,Unit1,RochesterG05000244AUTH.NAMEAUTHORAFFILIATIONMARTIN,J.T.RochesterGas&ElectricCorp.MERCREDY,R.C.RochesterGasaElectricCorp.RECIP.NAMERECIPIENTAFFILIATIONVISSINGiG.S.

SUBJECT:

LER96-011-00:on960807,improperconfigurationofcircuitbreakeroccurred.Duetoundetectedinternalinterference,resultinginautomaticstartofbothauxiliaryfeedwaterpumps.RunningAFWpumpsweresecured.W/960905ltr.DISTRIBUTIONCODE:IE22TCOPIESRECEIVED:LTR/ENCL(SIZE:TITLE:50.73/50.9LicenseeEventReport(LER),incidentRpt,etc.NOTES:LicenseExpdateinaccordancewith10CFR2,2.109(9/19/72).05000244ERECIPIENTIDCODE/NAMEPD1-1PDINTERNAL:E./Mig/EQBFILECENA~/5E/EELBNRR/DRCH/HHFBNRR/DRCH/HOLBNRR/DRPM/PECBNRR/DSSA/SRXBRGN1FILE01COPIESLTTRENCL112211111111111111RECIPIENTIDCODE/NAMEVISSING,G.AEOD/SPD/RRABNRR/DE/ECGBNRR/DE/EMEBNRR/DRCH/HICBNRR/DRCH/HQMBNRR/DSSA/SPLBRES/DSIR/EIBCOPIESLTTRENCL1111111111111111D0EXTERNAL:LSTLOBBYWARDNOACMURPHY,G.ANRCPDR111111LITCOBRYCE,JH.'vACPOORE,W.NUDOCSFULLTXT221111NNOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMOWFNSD-5(EXT~415-2083)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEEDlFULLTEXTCONVERSIONREQUIREDTOTALNUMBEROFCOP,;-~SREQUIRED:LTTR25ENCL25 4NDROCHESTERGASANDELECTRICCORPORATION~89EASTAVfNUE,ROCHESTER,N.YId6d9000I7AREACODE7165d62700ROScRTC.MECREDYVcePresidentNvctearOoerrst'orsSeptember5,1996U.S.NuclearRegulatoryCommissionDocumentControlDeskAttn:GuyS.VissingProjectDirectorateI-1Washington,D.C.20555

Subject:

LER96-011,ImproperConfigurationofCircuitBreaker,DuetoUndetectedInternalInterference,ResultsinAutomaticStartofBothAuxiliaryFeedwaterPumpsR.E.GinnaNuclearPowerPlantDocketNo.50-244

DearMr.Vissing:

Inaccordancewith10CFR50.73,LicenseeEventReportSystem,item(a)(2)(iv),whichrequiresareportof,"Anyeventorconditionthatresultedinamanualorautomaticactuationofanyengineeredsafetyfeature(ESF),includingthereactorprotectionsystem(RPS)",theattachedLicenseeEventReportLER96-011isherebysubmitted.Th!seventhasinnowayaffectedthepublic'shealthandsafety.Verytrulyyours,RobertC.Mecredyxc:Mr.GuyS.Vissing(MailStop14C7)PWRProjectDirectorateI-1Washington,D.C.20555U.S.NuclearRegulatoryCommissionRegionI475AllendaleRoadKingofPrussia,PA19406GinnaSeniorResidentInspectorc7609i30028960905PDRaOOCK0500044SPDR NRCFORM366(4-95)U.S.NUCLEARREGULATORYCOMMISSIOLICENSEEEVENTREPORT(LER)(Seereverseforrequirednumberofdigits/charactersfcreachblock)APPROVEDBYOMBNO.3160%104EXPIRES04/30/98ESTIMATEDBURDENPERRESPONSEToCOMPLYWITHTHISMANDATORYINFORMATIONCOLLECTIONREQUEST:50.0HRS.REPORTEDLESSONSLEARNEDAREINCORPORATEDINTOTHELICENSINGPROCESSANDFEDBACKToINDUSTRY.FORWARDCOMMENTSREGARDINGBURDENESTIMATEToTHEINFORMATIONANDRECORDSMANAGEMENTBRANCH(T-6F33),U.S.NUCI.EARREGULATORYCOMMISSION,WASHINGTON,DC20555cool,ANDTOTHEPAPERWORKREDUCTIONPROJECTFACIUTYNAMEIIIR.E.GinnaNuclearPowerPlantDOCKETNUMBERI2)05000244PAOEI3)1OF5TITLE(4IImproperConfigurationofCircuitBreaker,DuetoUndetectedInternalInterference,ResultsinAutomaticStartofBothAuxiliaryFeedwaterPumpsEVENTDATE(6)LERNUMBER(6)REPORTDATE(7)OTHERFACILITIESINVOLVED(8)MONTH08DAY07YEAR96SEQUENTIALREVISIONNUMBERNUMBER96-011-00MONTHOAY090596FACIUTYNAMEFACIUTYNAMEDOCKETNUMBERDOCKETNUMBEROPERATINGMODE(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)X50.73(a)(2)(iv)50.73(a)(2)(v)50.73(a)(2)(vii)THISREPORTISSUBMITTEDPURSUANTTOTHEREQUIREMENTSOF10CFR%:(Checkoneormore)(11)50.73(a)(2)(viii)50.73(a)(2)(x)73.71OTHERSpecifyinAbstractbelowormNRCForm366ANAMELICENSEECONTACTFORTHISLER(12)ELEFHONENUMBERilncrvdeAreaCodelJohnT.St.Martin-TechnicalAssistantCOMPLETEONELINEFOREACHCOMPONENTFAILUREDESC(716)771-3641RIBEDINTHISREPORT(13)CAUSESYSTEMCOMPONENTMANUFACTURERToNPRDSCAUSESYSTEMCOMPONENTMANUFACTURERREPORTABLEToNPROSSUPPLEMENTALREPORTEXPECTED(14)YES(Ifyes,completeEXPECTEDSUBMISSIONDATE).XNOEXPECTEDSUBMISSIONDATE(16)MONTHDAYYEARABSTRACT(Limitto1400spaces,i.e.,approximately15single-spacedtypewrittenlines)(16)OnAugust7,1996,atapproximately2009EDST,theplantwasinIVlode3withthereactorcoolantsystembeingmaintainedatatemperatureof545degreesFandapressurizerpressureof2235PSIG.Withnoauxiliaryfeedwaterpumpsrunningandonemainfeedwaterpumpcircuitbreakerrackedoutinthe"test"position,'n"AFWBypassSwitch"wasmovedfrom"Defeat"to"Normal".Anundetectedimproperconfigurationofthecircuitbreakercreatedthelogicthatbothmainfeedwaterpumpbreakerswerealreadyopen.Thiscreatedthelogicforautostartofboththe"A"and"B"motor-drivenauxiliaryfeedwaterpumps.Immediateactionwastostabilizeauxiliaryfeedwaterflowtobothsteamgenerators.Theunderlyingcauseoftheautostartwasthatthelogicforautostartdivaspresentduetoanundetectedinternalinterferencewithinthecircuitbreakerbetweentherackingarmandtheactuatingrodforthe52Sauxiliaryswitch,whichpreventedthisswitchfromopeningtoprovidethecircuitlogicthatthebreakerwasintheclosedposition.ThiseventisNUREG-1022CauseCode(A).CorrectiveactiontopreventrecurrenceisoutlinedinSectionV.B.NRCFORM366(4-95)

NRCFORM366A(4-95)LICENSEEEVENTREPORT(LER)TEXTCONTINUATIONU.S.NUCLEARREGULATORYCOMMISSIONFACILITYNAME(1)R.E.GinnaNuclearPowerPlantDOCKET05000244LERNUMBER(6)YEARSEQUENTIALREVISIONNUMBERNUMBER96-011-00PAGE(3)2OF5TEXTiifmorespeceisrequired,useedditionefcopiesofNRCForm366Aj(17)PRE-EVENTPLANTCONDITIONS:OnAugust7,1996,atapproximately2009EDST,theplantwasinMode3asaresultofavoluntaryplantshutdowntoupgrademotor-operatedvalvesintheresidualheatremovalIRHR)system.Valveupgradeswerecompletedandplantheatupandstartupwasinprogress.ThereactorcoolantsystemIRCS)wasbeingmaintainedatatemperatureofapproximately545degreesFandapressurizer(PRZR)pressureofapproximately2235PSIG.Thecircuitbreakerforthe"A"mainfeedwaterIMFW)pumphadjumpersinstalledandwasclosedinthe"test"position,tocomplywithtemporaryadministrativerequirements.AuxiliaryfeedwaterIAFW)pumpshadjustbeensecuredasdirectedbythesetemporaryadministrativerequirements,sotherewerenoAFWpumpsrunning.II.DESCRIPTIONOFEVENT:A.DATESANDAPPROXIMATETIMESOFMAJOROCCURRENCES:oAugust7,1996,2009EDST:Eventdateandtime.oAugust7,1996,2009EDST:Discoverydateandtime.oAugust7,1996,2024EDST:OnerunningAFWpumpissecured.oAugust7,1996,2135EDST:AllrunningAFWpumpsaresecured.EVENT:OnAugust7,1996,atapproximately2009EDST,theplantwasinMode3.TheRCSwasbeingmaintainedatatemperatureofapproximately545degreesFandaPRZRpressureofapproximately2235PSIG.AsdirectedbyNormalOperatingProcedure0-1.2,"PlantStartupFromHotShutdowntoFullLoad",theControlRoomoperatorsmovedan"AFWBypassSwitch"fromthe"Defeat"tothe"Normal"position.Duetoanundetectedimproperconfigurationofthecircuitbreakerforthe"A"MFWpump,the2of2logicforbothMFWpumpbreakersopenwaspresent,whichcausedanautostartofboththe"A"and"B"AFWpumps.TheControlRoomoperatorsobservedtheautostartofboththe"A"and"B"AFWpumps,andcontrolledAFWflowtothedesiredflowrateforMode3conditions.OneoftherunningAFWpumpswassecuredatapproximately2024EDST.TheControlRoomoperatorsrequestedthatplantelectriciansinvestigatetheproblem.Electriciansdetermined,whenrackingoutthecircuitbreakerintothe"test"position,thebreakerpositioningarmhadtravelledbeyonditsmechanicalstop.Thiscausedanundetectedinterferencebetweentherackingarmandthe52Sauxiliaryswitchactuatingrod,whichpreventedthe52Sswitchfromopeningtoprovidecircuitlogicthatthebreakerwasintheclosedposition.Thebreakerwasproperlyrackedout,andelectriciansverifiedtherewasnointerferenceandthatthe52Sswitchhadopened.NIICFOAM366A(4-95) tl NRCFORM366A(4-95)LICENSEEEXTENTREPORT(LER)TEXTCONTINUATIONU.S.NUCLEARREGULATORYCOMMISSIONFACILITYNAME(1)R.E.GinnaNuclearPowerPlantDOCKET05000244LERNUMBER(6)YEARSEQUENTIALREVISIONNUMBERNUMBER96-011-00PAGE(3)3OF5TEXT(Ifmorespeceisrequired,useeddidonelcopiesofNRCForm366AJ(17)C.INOPERABLESTRUCTURES,COMPONENTS,ORSYSTEMSTHATCONTRIBUTEDTOTHEEVENT:NoneD.OTHERSYSTEMSORSECONDARYFUNCTIONSAFFECTED:NoneE.METHODOFDISCOVERY:Thiseventwasimmediatelyapparentwhenboththe"A"and"B"AFWpumpsautostartedaftertheAFWBypassSwitchwasplacedinthe"Normal".position.OPERATORACTION:Afterboththe"A"and"B"AFWpumpsautostarted,theControlRoomoperatorstookpromptactionstocontrolAFWflow.Theyrequestedthattheplantelectriciansdeterminethecauseoftheproblem.TheControlRoomoperatorssubsequentlynotifiedhighersupervisionandnotifiedtheNRCper10CFR50.72(b)(2)(ii),non-emergencyfourhournotification,atapproximately2226EDSTonAugust7,1996.G.SAFETYSYSTEMRESPONSES:Boththe"A"and"B"AFWpumpsautostartedasperdesign.CAUSEOFEVENT:A.IMMEDIATECAUSE:Theimmediatecauseoftheautostartofboththe"A"and"B"AFWpumpswastheautostartlogic,whichwassatisfiedby52ScontactsprovidingcircuitlogicthatbothMFWpumpbreakerswereopenandanAFWBypassSwitchin"Normal".B.INTERMEDIATECAUSE:Theintermediatecauseofautostartlogicbeingsatisfiedwasanundetectedimproperconfigurationofthe"A"'MFWpumpcircuitbreaker.NRCFORM36:6I's)

NRCFORM366A(4-95)LICENSEEEVENTREPORT(LER)TEXTCONTINUATIONU.S.NUCLEARREGULATORYCOMMISSIONFACILITYNAME(1)DOCKETLERNUMBER(6)PAGE(3)R.E.GinnaNuclearPowerPlant05000244YEARSEQUENTIALREVISIONNUMBERNUMBER4OF596-011-00TEXTIifmorespaceisrequired,useadditionalcopiesofNRCForm36@A/(17)C.ROOTCAUSE:Theunderlyingcauseoftheimproperconfigurationwasanundetectedinternalinterferencewithinthe"A"MFWpumpcircuitbreaker.Whenthebreakerwasrackedouttothetestposition,thebreakerpositioningarmtravelledbeyonditsmechanicalstop.Thiscausedinterferencebetweentherackingarmandtheactuatingrodforthe52Sauxiliarycontactswitch.Therefore,whilethebreakerwasphysicallyclosedinthe"test"position,theauxiliaryswitchdidnotprovidecircuitlogicthatthebreakerwasintheclosedposition.ThissituationwascreatedtobeincompliancewiththeGinnaStationImprovedTechnicalSpecifications(ITS)Table3.3.2-1Function6.f.TopreventanunnecessaryactuationofbothAFWpumpsduringMode2conditions,aMFWpumpbreakermaybeadministrativelyclosedinthetestposition,provideditiscapableofbeingtrippedonundervoltageandovercurrentconditions.TheadministrativerequirementswereestablishedtocomplywithITSTable3.3.2-1,whichrequirestheautostartfunctionofthemotor-drivenAFWpumpuponopeningofbothMFWpumpbreakersduringModes1and2.PriortoAmendmentNo.61totheITS,thisfunctionwasonlyrequiredinMode1whentheMFWpumpswereactuallyinservice.TheadditionofMode2(whentheMFWpumpsmaynotbeinservice)wasinadvertentlyaddedtotheITSbyAmendmentNo.61.ThiseventisNUREG-1022CauseCode(A),"PersonnelError".Thiserrorwasacognitiveerroronthepartofaplantelectrician,whodidnotdetecttheinterferencebetweentherackingarmandtheactuatingrod.Thiserrorwasassociatedwithactivitiesthatwerecoveredbyanapprovedprocedure,andwasnotcontrarytothatprocedure.Theproceduralguidancewascorrect,butenhancementstotheprocedurehavebeenidentified.Therewerenounusualcharacteristicsofthelocationofthisbreakerthatcontributedtothisevent.Notethatthisinterferencecanonlybecreatedwhenrackingthebreakerouttothetestposition.TheautostartoftheAFWpumpdoesnotmeettheNUMARC93-01,"IndustryGuidelineforMonitoringtheEffectivenessofMaintenanceatNuclearPowerPlants",definitionofa"MaintenancePreventableFunctionalFailure".IV.ANALYSISOFEVENT:Thiseventisreportableinaccordancewith10CFR50.73,LicenseeEventReportSystem,item(a)(2)(iv),whichrequiresareportof,"Anyeventorconditionthatresultedinamanualorautomaticactuationofanyengineeredsafetyfeature(ESF),includingthereactorprotectionsystem(RPS)".ThestartofanAFWpumpisanactuationnfanESF.Anassessmentwasperformedconsideringboththesafetyconsequencesandimplicationsofthiseventwiththefollowingresultsandconclusions:Therewerenooperationalorsafetyconsequencesorimplicationsattributedtotheautostartofboththe"A"and"B"AFWpumpsbecause:oTheautostartoccurredwithacceptablelevelsinbothS/Gs.AFWflowwascontrolledtomaintaintheselevels.NRCFOR)A366A(4.95)

NRCFORM366A(4-96)LICENSEEEVENTREPORT(LER)TEXTCONTINUATIONU.S.NUCLEARREGULATORYCOMMISSIONFACILITYNAME(1)R.E.GinnaNuclearPowerPlantDOCKET05000244LERNUMBER(6)YEARSEQUENTIALREVISIONNUMBERNUMBER96-011-00PAGE(3)5OF5TEXTllfmorespaceisrequired,useadditionalcopiesofNRCForm366A/(17)oThelimitingcaseforthesupplyofAFWistheLossofFeedwateraccidentat100'/opower.Theplantconditionatthetimeofthiseventwaslessthan5%power.Basedontheabove,itcanbeconcludedthatthepublic'shealthandsafetywasassuredatalltimes.V.CORRECTIVEACTION:A.ACTIONTAKENTORETURNAFFECTEDSYSTEMSTOPRE-EVENTNORMALSTATUS:AFWflowwascontrolledasdesiredtomaintainS/Glevel.oTherunningAFWpumpsweresecured.B.ACTIONTAKENORPLANNEDTOPREVENTRECURRENCE:TheITSwillberevisedtoeliminatetheneedforhavingaMFWpumpbreakerclosedinthetestpositionduringMode2conditions.Procedure0-2.1willbeenhancedtoincludespecificallyaddressingthatthe52Sswitchactuatingrodisinthecorrectpositionwhenthebreakerisrackedoutinthetestposition.Vi.ADDITIONALINFORMATION:A.FAILEDCOMPONENTS:NoneB.PREVIOUSLERsONSIMILAREVENTS:AsimilarLEReventhistoricalsearchwasconductedwiththefollowingresults:NodocumentationofsimilarLEReventswiththesamerootcausecouldbeidentified.However,LERs96-004,96-008,and96-010aresimilareventswithdifferentrootcauses.C.SPECIALCOMfvlENTS:NoneNRCFORM9"~A(4-95)