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

ACCELERATED DILUTIONDEMONSTP+TION SYSTEMREGULATORY INFORMATION DISTRIBUTION SYSTEM(RIDS)ACCESSION NBR:9103260186 DOC.DATE:

91/03/18NOTARIZED:

NODOCKETgFACIL:50-244 RobertEmmetGinnaNuclearPlant,Unit1,Rochester G05000244AUTH.NAMEAUTHORAFFILIATION BACKUS,W.H.

Rochester Gas&ElectricCorp.MECREDY,R.C.

Rochester Gas&ElectricCorp.RECIP.NAME RECIPIENT AFFILIATION

SUBJECT:

LER91-001-00:on 910215,loss ofsafeguards busduringEmergency DieselGenerator monthlyloadtest.Causedbysupplybreakerstripping.Bus 18,emergency dieselgenerator 1A&outputbreakerinspected.W/910318 ltr.DISTRIBUTION CODE:IE22TCOPIESRECEIVED:LTR ENCLSIZE:0TITLE:50.73/50.9 LicenseeEventReport(LER),ncidenRpt,etc.NOTES:License Expdateinaccordance with10CFR2,2.109(9/19/72).

D05000244DRECIPIENT IDCODE/NAME PD1-3LAJOHNSON,A INTERNAL:

ACNWAEOD/DSP/TPAB NRR/DET/ECMB 9HNRR/DLPQ/LHFB11 NRR/DOEA/OEAB NRR/DST/SELB 8DNSPLB8D102GN1FILE01EXTERNAL:

EG&GBRYCE,J.H NRCPDRNSICMURPHYiG~ACOPIESLTTRENCL1111221111111111111111331111RECIPIENT IDCODE/NAME PD1-3PDAEOD/DOAAEOD/ROAB/DS PNRR/DET/EMEB 7ENRR/DLPQ/LPEB10 NRR/DREP/PRPB11 NRR/DST/SICB 7ENRR/DST/SRXB 8ERES/DSIR/EIB ILSTLOBBYWARDNSICMAYS,GNUDOCSFULLTXTCOPIES,LTTRENCL111122111122111111111111DDNOTETOALL"RIDS"RECIPIENTS:

DDPLEASEHELPUSTOREDUCEWASTETHCONTACTTHEDOCUMENTCONTROLDESK,ROOMP1-37(EXT.20079)TOELIMINATE YOURNAMEFROMDISTRIBUTION LISTSFORDOCUMENTS YOUDON'TNEED!FULLTEXTCONVERSION REQUIREDTOTALNUMBEROFCOPIESREQUIRED:

LTTR31ENCL31 E1

'iI//'nij/!ri/rROCHESTER GASANDELECTRICCORPORATION rrtwll(lall~+~/'trorrtstntc~89EASTAVENUE,ROCHESTER N.Y.14649-0001 ROBERTC.MECREDYVicePresident CinneNucteerProduction TEt.EPHOirK AAEACDOePte54627MMarch18,1991U.S.NuclearRegulatory Commission DocumentControlDeskWashington, DC20555

Subject:

LER91-001,LossofSafeguards BusDuringEmergency DieselGenerator MonthlyLoadTest,DueToSupplyBreakersTripping, CausesACondition Prohibited ByThePlantTechnical Specifications R.E.GinnaNuclearPowerPlantDocketNo.50-244Inaccordance with10CFR50.73,LicenseeEventReportSystem,item(a)(2)(i)(B),

whichrequiresareportof,"anyoperation'rohibited bythePlant'sTechnical Specifications",

theattachedLicenseeEventReportLER91-001isherebysubmitted.

Thiseventhasinnowayaffectedthepublic'shealthandsafety.Vetrulyyours,RobertC.McredXC;U.S.NuclearRegulatory Commission RegionI475Allendale RoadKingofPrussia,PA19406GinnaUSNRCSeniorResidentInspector 9l03260i86 9103iSPDRADOCK0000244~\PDR k

HACSsrrsSSS)$05)LICENSEEEVENTREPORT(LERlUANVCLSAAASOULAT01'0 COSWSWKNI AsrHOYSOOsslHO.SISS.0)Ov

~SSIACSSSSI/SSDocASTHVMSSNQlSACIL)TYHAS)0Ii)R.E.GinnaNuclearPowerPlanto6ooo244IOF0g'"LossofSafeguards BusDuringEmergencv DieselGenerator MonthlyLoadTestsDueToSu1BreakersTriin,CausesACondition Prohibited BTheP1antTechScs.CVlNTOATSISIMONTHDAYYCA1LC1NVssll1lll1lso1TD*TCIllOTHl1SACILI'T)ll INVOLVCOW)02191MSAAT)HONMOOSie)SOWC1LtvlL09YCA1%'toulrsr<AL HuvslrssuMS~1MOHTHOAYYCA1SACsLstrHAsSISOO<<STHVMSSAISI osooo0010o31895551)SITS.TIIII~0.T54IQ)orISC.TS4)QI)rl N.T5lslQI)rllSC,T54)Q)irW)IAI~0.554)it)lrWII~Il0.154)QUsl tl.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)sAcso1TllsvsMITTSD svAsuAHTToTHcAtov)ASMCNTT 0s)lcs1$slorrssss<<sssrssrsrsrsrrrrrs)

IIIIHAMSWesleyH.BackusTechnical Assistant totheationMaTCLCSHOHC NVMSCIIA)ISACOOS315524-444.6COSSSLSTt ONCLINCSOACACNCOMSOHCNT SAILU1COCSC1)SCD SNTH>>CtSO1TI)t)CAVSSSYSTCMCOSSSOHCNT MAHVSACTVWC1CSOSITASLC ToHSIOSSYSTCMCOMSOHCNT MAHVSACTVAC1CSOSITASL ToHSWDSSVSSLtMlHT*L AtSOATlSSlCTCOI)slMOHTHCAYYCA)ICXSCCTCOLVSM<SSIOH DATC11~IYCSOSrsr.rrrusrH55SCCTCOSVSM)55)0>>

OATS)HOASSTAADTIL4srrssIso)ssrr>>.Ss.,sssrssssrsNrs HINrrsr4srrsssrr lrsrsrsrHs Mrsslll~I.-IFebruary15,1991at0845ESTwiththereactoratapproximately

.74fullpower,theemergency andnormalfeedbreakerstoBus18.rippedwhilethe1AEmergency DieselGenerator wasbeingparal-eledontothebus.ThelossofBus18placedtheplantinacondition prohibited byplantTechnical Specifications.'mmediate operatoractionconsisted ofstartinganadditional servicewaterpumpfromBus17.Subsequently, theControlRoomoperators declaredanUnusualEvent:andcommenced aplantshutdowntocomplywithplantTechnical Specifications.

Theunderlying causeoftheeventisundct.ermined atthistime.Furthertestingandevaluation willbeperformed.

Corrective actionwastoinspectBus18,the1AEmergency DieselGenerator outputbreakerandthe1AEmergency DieselGenerator.

Components werefoundsatisfactory andreturnedtoservice.sr1CSsrrsSN)SASI I

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1IPIC NIICfons$NAIMJILICENSEEEVENTREPORT(LER)TEXTCONTINUATION Il.$.NUCLlAIIAtOULATOIIY COMMI$$ION/Aff<<OVTOOUINOgl$0&IO$4)CttAIS$/31+$fACILITYNAM$IIIOOC<<tTNUMICIIIXILIIINUMIl1III$$Q<<$<<TIAL~IVY1II$VISIOHHM~8~AQKIIIR.E.GinnaNuclearPowerPlantTEXTINoaf<<MCe<<~.vm<<<<M$MWlYIICA$<<<<~lIII'osooo4491-001-009or09,B.ACTIONTAKENORPLANNEDTOPREVENTRECURRENCE.

Inadditiontotheactionstakentoreturnthesystemstonormalstatus,thefollowing actionwill'betaken:oAdditional testingandcalibration of.the50Govercurrent groundrelayforBus18.00Paralleling the1AEmergency DieselGenerator toBus18perPT-12.1hasbeenperformed twicewhilebeingmonitored withextensive instrumenta'-

tion.Theimmediate resultsidentified thatbreakerspeedofclosureandoperatorsynchroni-zationisfunctioning correctly.

Theresultsofthiseffortwillbefurtherevaluated bytheElectrical Engineering Department.

Applicable procedures forparalleling theDieselGenerator arebeingrevisedasrequiredtobeconsistent withtraining.

VI.ADDITIONAL INFORMATION A.FAILEDCOMPONENTS:

None.BPREVIOUSLERsONSIMILAREVENTS:AsimilarLEReventhistorical searchwasconducted withthefollowing results.Nodocumentation ofsimilarLEReventsatGinnacouldbeidentified.

C.SPECIALCOMMENTS:

None.N<<CfOAU$$$AiOA$~