ML17262A419

LER 91-001-00:on 910215,loss of Safeguards Bus Occurred During Emergency Diesel Generator Monthly Load Test.Caused by Supply Breakers Tripping.Bus 18,emergency Diesel Generator 1A & Output Breaker inspected.W/910318 Ltr

ML17262A419
Person / Time
Site:	Ginna
Issue date:	03/18/1991
From:	BACKUS W H, MECREDY R C ROCHESTER GAS & ELECTRIC CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-91-001, LER-91-1, NUDOCS 9103260186
Download: ML17262A419 (22)

Text

ACCELERATEDDILUTIONDEMONSTP+TIONSYSTEMREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9103260186DOC.DATE:91/03/18NOTARIZED:NODOCKETgFACIL:50-244RobertEmmetGinnaNuclearPlant,Unit1,RochesterG05000244AUTH.NAMEAUTHORAFFILIATIONBACKUS,W.H.RochesterGas&ElectricCorp.MECREDY,R.C.RochesterGas&ElectricCorp.RECIP.NAMERECIPIENTAFFILIATION

SUBJECT:

LER91-001-00:on910215,lossofsafeguardsbusduringEmergencyDieselGeneratormonthlyloadtest.Causedbysupplybreakerstripping.Bus18,emergencydieselgenerator1A&outputbreakerinspected.W/910318ltr.DISTRIBUTIONCODE:IE22TCOPIESRECEIVED:LTRENCLSIZE:0TITLE:50.73/50.9LicenseeEventReport(LER),ncidenRpt,etc.NOTES:LicenseExpdateinaccordancewith10CFR2,2.109(9/19/72).D05000244DRECIPIENTIDCODE/NAMEPD1-3LAJOHNSON,AINTERNAL:ACNWAEOD/DSP/TPABNRR/DET/ECMB9HNRR/DLPQ/LHFB11NRR/DOEA/OEABNRR/DST/SELB8DNSPLB8D102GN1FILE01EXTERNAL:EG&GBRYCE,J.HNRCPDRNSICMURPHYiG~ACOPIESLTTRENCL1111221111111111111111331111RECIPIENTIDCODE/NAMEPD1-3PDAEOD/DOAAEOD/ROAB/DSPNRR/DET/EMEB7ENRR/DLPQ/LPEB10NRR/DREP/PRPB11NRR/DST/SICB7ENRR/DST/SRXB8ERES/DSIR/EIBILSTLOBBYWARDNSICMAYS,GNUDOCSFULLTXTCOPIES,LTTRENCL111122111122111111111111DDNOTETOALL"RIDS"RECIPIENTS:DDPLEASEHELPUSTOREDUCEWASTETHCONTACTTHEDOCUMENTCONTROLDESK,ROOMP1-37(EXT.20079)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!FULLTEXTCONVERSIONREQUIREDTOTALNUMBEROFCOPIESREQUIRED:LTTR31ENCL31 E1

'iI//'nij/!ri/rROCHESTERGASANDELECTRICCORPORATIONrrtwll(lall~+~/'trorrtstntc~89EASTAVENUE,ROCHESTERN.Y.14649-0001ROBERTC.MECREDYVicePresidentCinneNucteerProductionTEt.EPHOirKAAEACDOePte54627MMarch18,1991U.S.NuclearRegulatoryCommissionDocumentControlDeskWashington,DC20555

Subject:

LER91-001,LossofSafeguardsBusDuringEmergencyDieselGeneratorMonthlyLoadTest,DueToSupplyBreakersTripping,CausesAConditionProhibitedByThePlantTechnicalSpecificationsR.E.GinnaNuclearPowerPlantDocketNo.50-244Inaccordancewith10CFR50.73,LicenseeEventReportSystem,item(a)(2)(i)(B),whichrequiresareportof,"anyoperation'rohibitedbythePlant'sTechnicalSpecifications",theattachedLicenseeEventReportLER91-001isherebysubmitted.Thiseventhasinnowayaffectedthepublic'shealthandsafety.Vetrulyyours,RobertC.McredXC;U.S.NuclearRegulatoryCommissionRegionI475AllendaleRoadKingofPrussia,PA19406GinnaUSNRCSeniorResidentInspector9l03260i869103iSPDRADOCK0000244~\PDR k

HACSsrrsSSS)$05)LICENSEEEVENTREPORT(LERlUANVCLSAAASOULAT01'0COSWSWKNIAsrHOYSOOsslHO.SISS.0)Ov~SSIACSSSSI/SSDocASTHVMSSNQlSACIL)TYHAS)0Ii)R.E.GinnaNuclearPowerPlanto6ooo244IOF0g'"LossofSafeguardsBusDuringEmergencvDieselGeneratorMonthlyLoadTestsDueToSu1BreakersTriin,CausesAConditionProhibitedBTheP1antTechScs.CVlNTOATSISIMONTHDAYYCA1LC1NVssll1lll1lso1TD*TCIllOTHl1SACILI'T)llINVOLVCOW)02191MSAAT)HONMOOSie)SOWC1LtvlL09YCA1%'toulrsr<ALHuvslrssuMS~1MOHTHOAYYCA1SACsLstrHAsSISOO<<STHVMSSAISIosooo0010o31895551)SITS.TIIII~0.T54IQ)orISC.TS4)QI)rlN.T5lslQI)rllSC,T54)Q)irW)IAI~0.554)it)lrWII~Il0.154)QUsltl.sNlslNJNs)IIISCMHIQI50.sot)i)SILAN4)I)IIS50ACSIs)IIIIll50AOS4IIIIIWISCA)>>41(1)lsrlSO.SN)sII)Ilrlo6ooo0THC1ltsssrrs4Asrssrrsrsrss0lsTssLHACSsrrr550A)~0.T54)Q))0~0T54)Q)IlllO.T54IQIIWlL)CCHSllCONTACTS01TH)SLC1l)tlTH)sAcso1TllsvsMITTSDsvAsuAHTToTHcAtov)ASMCNTT0s)lcs1$slorrssss<<sssrssrsrsrsrrrrrs)IIIIHAMSWesleyH.BackusTechnicalAssistanttotheationMaTCLCSHOHCNVMSCIIA)ISACOOS315524-444.6COSSSLSTtONCLINCSOACACNCOMSOHCNTSAILU1COCSC1)SCDSNTH>>CtSO1TI)t)CAVSSSYSTCMCOSSSOHCNTMAHVSACTVWC1CSOSITASLCToHSIOSSYSTCMCOMSOHCNTMAHVSACTVAC1CSOSITASLToHSWDSSVSSLtMlHT*LAtSOATlSSlCTCOI)slMOHTHCAYYCA)ICXSCCTCOLVSM<SSIOHDATC11~IYCSOSrsr.rrrusrH55SCCTCOSVSM)55)0>>OATS)HOASSTAADTIL4srrssIso)ssrr>>.Ss.,sssrssssrsNrsHINrrsr4srrsssrrlrsrsrsrHsMrsslll~I.-IFebruary15,1991at0845ESTwiththereactoratapproximately.74fullpower,theemergencyandnormalfeedbreakerstoBus18.rippedwhilethe1AEmergencyDieselGeneratorwasbeingparal-eledontothebus.ThelossofBus18placedtheplantinaconditionprohibitedbyplantTechnicalSpecifications.'mmediateoperatoractionconsistedofstartinganadditionalservicewaterpumpfromBus17.Subsequently,theControlRoomoperatorsdeclaredanUnusualEvent:andcommencedaplantshutdowntocomplywithplantTechnicalSpecifications.Theunderlyingcauseoftheeventisundct.erminedatthistime.Furthertestingandevaluationwillbeperformed.CorrectiveactionwastoinspectBus18,the1AEmergencyDieselGeneratoroutputbreakerandthe1AEmergencyDieselGenerator.Componentswerefoundsatisfactoryandreturnedtoservice.sr1CSsrrsSN)SASI I

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1IPIC NIICfons$NAIMJILICENSEEEVENTREPORT(LER)TEXTCONTINUATIONIl.$.NUCLlAIIAtOULATOIIYCOMMI$$ION/Aff<<OVTOOUINOgl$0&IO$4)CttAIS$/31+$fACILITYNAM$IIIOOC<<tTNUMICIIIXILIIINUMIl1III$$Q<<$<<TIAL~IVY1II$VISIOHHM~8~AQKIIIR.E.GinnaNuclearPowerPlantTEXTINoaf<<MCe<<~.vm<<<<M$MWlYIICA$<<<<~lIII'osooo4491-001-009or09,B.ACTIONTAKENORPLANNEDTOPREVENTRECURRENCE.Inadditiontotheactionstakentoreturnthesystemstonormalstatus,thefollowingactionwill'betaken:oAdditionaltestingandcalibrationof.the50GovercurrentgroundrelayforBus18.00Parallelingthe1AEmergencyDieselGeneratortoBus18perPT-12.1hasbeenperformedtwicewhilebeingmonitoredwithextensiveinstrumenta'-tion.Theimmediateresultsidentifiedthatbreakerspeedofclosureandoperatorsynchroni-zationisfunctioningcorrectly.TheresultsofthiseffortwillbefurtherevaluatedbytheElectricalEngineeringDepartment.ApplicableproceduresforparallelingtheDieselGeneratorarebeingrevisedasrequiredtobeconsistentwithtraining.VI.ADDITIONALINFORMATIONA.FAILEDCOMPONENTS:None.BPREVIOUSLERsONSIMILAREVENTS:AsimilarLEReventhistoricalsearchwasconductedwiththefollowingresults.NodocumentationofsimilarLEReventsatGinnacouldbeidentified.C.SPECIALCOMMENTS:None.N<<CfOAU$$$AiOA$~