ML17264A147

LER 95-007-00:on 950803,lost Power from 34.5 Kv Offsite Power Circuit 751 Due to Offsite Electrical Storm,Resulting in Automatic Start of EDG B.Offsite Power Restored,Edg B Stopped & Realigned & Circuit 751 cleared.W/950901 Ltr

ML17264A147
Person / Time
Site:	Ginna
Issue date:	09/01/1995
From:	MECREDY R C, ST MARTIN J T ROCHESTER GAS & ELECTRIC CORP.
To:	JOHNSON A R NRC (Affiliation Not Assigned), NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-95-007, LER-95-7, NUDOCS 9509070205
Download: ML17264A147 (13)

Text

IpRIORITY 3.(ACCELERATED RZDSPROCESSING)

REGULATORY INFORMATION DISTRIBUTION SYSTEM(RIDS)ACCESSION NBR:9509070205 DOC.DATE:

95/09/01NOTARIZED:

NODOCKETgFACIL:50-244 RobertEmmetGinnaNuclearPlant,Unit1,Rochester G05000244PAUTH.NAMEAUTHORAFFILIATION STMARTIN,J.T.

Rochester Gas&ElectricCorp.MECREDY,R.C.

Rochester Gas&ElectricCorp.RECIP.NAME RECIPIENT AFFILIATION JOHNSON,A.R.

SUBJECT:

LER95-007-00:on 950803,lost powerfrom34.5kVoffsiteowerCircuit751duetooffsiteelectrical'torm, resulting nautomatic startofEDGB.Offsite powerrestored,EDG Bstopped&realigned

&Circuit751cleared.W/950901 ltr.DISTRIBUTION CODE:IE22TCOPIESRECEIVED:LTRl ENCL1SIZE:!lTITLE:50.73/50.9 LicenseeEventReport(LER),IncidentRpt,etc.0RNOTES:License Expdateinaccordance with10CFR2,2.109(9/19/72).

05000244TRECIPIENT IDCODE/NAME PD1-1PDINTERNAL:

AE~O/SZD/~B

~ILECENTER~Rim-BNRR/DISP/PIPB NRR/DRCH/HICB NRR/DRPM/PECB NRR/DSSA/SPSB/B RES/DSIR/EIB EXTERNAL:

LSTLOBBY.WARDNOACMURPHY,G.A NRCPDRCOPIESLTTRENCL112211111111111111111111RECIPIENT IDCODE/NAME JOHNSON,A AEOD/SPD/RRAB NRR/DE/ECGB NRR/DE/EMEB NRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DSSA/SPLB NRR/DSSA/SRXB RGN1FILE01LITCOBRYCE,JHNOACPOORE,W.NUDOCSFULLTXTCOPIESLTTRENCL1'1111111111111111221111D,'M)NNOTETOALL"RZDS"RECIPIENTS:

PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMOWFN5D8(415-2083)

TOELIMINATE YOURNAMEFROMDISTRIBUTION

.LISTSFORDOCUMENTS YOUDON'TNEED!FULLTEXTCONVERSION REQUIREDTOTALNUMBEROFCOPIESREQUIRED:

LTTR26ENCL26 ANDROCHESTER GASANDElECTRTCCORPORATTON

+89EASTAVENUE, ROCHESTER, MY14649.0001 AREACODE71654'6-27NROBERTC.MECREDYVicePresident NvcleorOperotions September 1,1995U.S.NuclearRegulatory Commission DocumentControlDeskAttn:AllenR.JohnsonPWRProjectDirectorate I-1Washington, D.C.20555

Subject:

LER95-007,Lossof34.5KVOffsitePowerCircuit751,DuetoOffsiteElectrical Storm,ResultsinAutomatic Startof"B"Emergency DieselGenerator R.E.GinnaNuclearPowerPlantDocketNo.50-244Inaccordance with10CFR50.73,LicenseeEventReportSystem,item(a)(2)(iv),whichrequiresareportof,"Anyeventorcondition thatresultedinamanualorautomatic actuation ofanyengineered safetyfeature(ESF),including thereactorprotection system(RPS)",theattachedLicenseeEventReportLER95-007isherebysubmitted.

Thiseventhasinnowayaffectedthepublic'shealthandsafety.Verytrulyyours,RobertC.Mecredyxc:U.S.NuclearRegulatory Commission Mr.AllenR.Johnson(MailStop14B2)PWRProjectDirectorate I-1Washington, D.C.20555U.S.NuclearRegulatory Commission RegionI475Allendale RoadKingofPrussia,PA19406U.S.NRCGinnaSeniorResidentInspector t.(E<~950'9070205 9'50'st01 PDRADOCK05000244~gpssl)

HRCFORM366(5-92)U.S.NUCLEARREGULATORY IXNHISSIOH APPROVEDBYNHO.3150-0104 EXPIRES5/31/95LICENSEEEVENTREPORT(LER)(Seereverseforrequirednumberofdigits/characters foreachblock)ESTIHATED BURDEHPERRESPONSETOCOHPLYWITHTHISINFORHATION COLLECTIOH REQUEST:50.0HRS.FOR'WARDCOMMENTSREGARDING BURDENESTIHATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRANCH(HNBB7714),U.S.NUCLEARREGULATORY COHHISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION" PROJECT(31800104),OFFICEOFHAHAGEHEHT ANDBUDGETWASHINGTON DC20503.FAGILITYNAME(1)R.E.GinnaNuclearPowerPlantDOCKETNNIBER(2)05000244PAGE(3)10F10TITLE(4)Lossof34.5KVOffsitePoMerCircuit751,DuetoOffsiteElectrical Storm,ResultsinAutomatic Startof<<B<<Emergency DieselGenerator EVEHTDATE(5)LERNUMBER(6)REPORTDATE(7)OTHERFACILITIES INVOLVED(S)HOHTHDAYYEARYEARSEQUENTIAL REVISION MONTHNUMBERNUHBERDAYFACILITYHAHEYEARDOCKETNUMBER.08039595--007--000901FACILITYNAMEDOCKETHUMBEROPERATING H(NE(9)NTHISREPORTISSUBHITTED PURSUANTTOTHEREQUIREMENTS OF10CFR5.(Checkoneormore)(11)20.402(b) 50.73(a)(2)(iv) 20.405(c) 73.71(b)POWERLEVEL(10)09720405(a)(1)(i)20.405(a)(l)(ii) 20.405(a)(1)(iii) 20.405(a)(1)(iv) 20.405(a)(1)(v) 50.36(c)(1) 50.36(c)(2) 50.73(a)(2)(i) 50.73(a)(2)(ii) 50'3(a)(2)(iii)

LICENSEECONTACTFORTHISLER(12)50.73(a)(2)(v) 50.73(a)(2)(vii) 50.73(a)(2)(viii)(A) 50.73(a)(2)(viii)(B) 50.73(a)(2)(x) 73.71(c)OTHER(SpecifyinAbstractbelowandinText,HRCForm366A)HAMEJohnT.St.Martin-Technical Assistant TELEPHONE NUMBER(includeAreaCode)(716)771-3641CNIPLETEONELINEFOREACHCOMPONENT FAILUREDESCRIBED INTHISREPORT(13)CAUSESYSTEHCOMPONENT EACBL5HANUFACTURER X000REPORTABLE TONPRDSN,CAUSESYSTEHCOHPOHENT HANUFACTURER REPORTABLE TONP)DSSUPPLEHENTAL REPORTEXPECTED(14)YES(Ifyes,completeEXPECTEDSUBHISSION DATE).XHOEXPECTEDSUSHISSIOHDATE(15)MONTHDAYYEARABSTRACT(Limitto1400spaces,i.e.,approximately 15single-spaced typegrittenlines)(16)OnAugust3,1995,atapproximately 1526EDST,withthereactoratapproximately 97%steadystatepower,powerfromCircuit751(34.5KVoffsitepowersource)waslost.Thisresultedindeenergization of4160Voltbus12Band"B"train480Voltsafeguards buses16and17.The"B"Emergency DieselGenerator (D/G)automatically started'nd reenergized buses16and17asperdesign.Therewasnochangeinreactorpowerorturbineload.Immediate corrective actionwastoperformtheappropriate actionsofAbnormalProcedure AP-ELEC.1 (Lossof12AAnd/Or12BBusses)tostabilize theplantandtoverifythatthe"B"Emergency D/Ghadstartedandreenergized buses16and17.ThecauseofthelossofpowerfromCircuit751wasdetermined tobeelectrical stormactivitythataffectedcircuitsatoffsiteStation204andtrippedthe"C"phaseinstantaneous overcurrent protective relayforCircuit751(atStation204),deenergizing thecircuit.ThiseventisNUREG-1022 CauseCode(C).HRCFORH366(5-92)

HRCFORN366A(5-92)U.S.NUCLEARREGULATORY C(NHISSIOH LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYOIBHO-3150-0104 EXPIRES5/31/95ESTIHATEO BURDENPERRESPONSETOCOHPLYWITHTHISINFORHATIOH COLLECTION REQUEST:50.0BR'ORWARD COHHEHTSREGARDING BURDENESTINATETOTHEINFORNATION ANDRECORDSHANAGEHENT BRANCH(HNBB7714),U.S.NUCLEARREGULATORY C(WNISSION

~WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3150-0104),

OFFICEOFNANAGENENT ANDBUDGETWASHIHGTON DC20503-FACILITYHAHE(1)R.E.GinnaNuclearPowerPlantDOCKETNWBER(2)05000244LERNIMBER(6)SEQUENTIAL NUHBER--007--REVISIONHUNBER00PAGE(3)2OF10TEXT(lfmorespaceisrequired, useadditional copiesofHRCForm366A)(17)I.PRE-EVENT PLANTCONDITIONS Theplantwasatapproximately 97%steadystatereactorpower.The"B"Emergency DieselGenerator (D/G)hadbeenremovedfromserviceearlieronAugust3toperformplannedmaintenance (andhadbeendeclaredinoperable at0422EDSTtoperformthismaintenance).

Bymid-afternoon onAugust3,themaintenance hadbeencompleted, butthe"B"Emergency D/Gwasstillconsidered inoperable, pendingcompletion ofpost-maintenance testing.Duetoweatherconditions (a'hunderstorm wasinprogressinthevicinityoftheplant),testingwasbeingdeferreduntilthethunderstorm passed.ThePlantManagerrecommended thatthe"B"Emergency D/Gbealignedforautostandby(although stillinoperable fromanadministrative viewpoint) tobeanavailable sourceofpowerintheeventofalossofoffsitepowerduringthethunderstorm.

Therefore, the"B"Emergency D/Gwasalignedforautostandby.Theoffsitepowerconfiguration totheplantwasinthealternate "50%/50%"offsitepowerlineup.Thisconfiguration usesCircuit767(insteadofCircuit751)tosupplypowertothe"A"trainofsafeguards equipment:

oCircuit751(34.5KVoffsitepowersource)wassupplying powertothe"B"train480Voltsafeguards buses16and17through34.5KVto4160Volttransformer 12A(12Atransformer),

viaCircuitBreaker52/12AX,to4160Voltbus12B,andthroughthesafeguards bus4160Voltto480Volttransformers.

oCircuit767(34.5KVoffsitepowersource)wassupplying powertothe"A"train480Voltsafeguards buses14and18through34.5KVto4160Volttransformer 12B(12Btransformer),

viaCircuitBreaker52/12BY,to4160Voltbus12A,andthroughthesafeguards bus4160Voltto480Volttransformers.

Seetheattachedsketchoftheoffsitepowerdistribution system.II.DESCRIPTION OFEVENTA.DATESANDAPPROXIMATE TIMESOFMAJOROCCURRENCES:

oAugust3,1995,1526EDST:Eventdateandtime.August3,1995,1526EDST:Discovery dateandtime.HRCFORN366A(5-92)

NRCFORH366A(5-92)U.S.NUCLEARREGULATORY CQQIISSIOHLICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYQIBNO.3150-0104 EXPIRES5/31/95ESTIHATED BURDENPERRESPONSETOCONPLYWITHTHISINFORHATION COLLECTION REQUEST:50.0HRS~FORWARDCONNENTSREGARDING BURDENESTIHATETOTHEIHFORHATION ANDRECORDSHANAGEHENT BRANCH(HNBB7714)~U.S.NUCLEARREGULATORY COHNISSIOH

~WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3150.0104),

OFFICEOFHANAGEHENT ANDBUDGETWASHINGTON DC20503.FACILITYNAKE(1)R.E.GinnaNuclearPowerPlantDOCKETNIHIBER(2)05000244LERNQIBER(6SEQUENTIAL NUHBER95--007--REVISIONNUHBER00PAGE(3)30F10TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)August3,1995,1526EDST:ControlRoomoperators verifythe"B"Emergency DieselGenerator (D/G)operation andthatsafeguards buses16and17areenergized.

August3,1995,1628EDST:Safeguards buses16and17weretransferred toCircuit767fromthe"B"Emergency D/G.August3,1995,1635EDST:The"B"Emergency D/Gwasstoppedandrealigned forautostandby.oAugust3,1995,1644EDST:Circuit751wasdeclaredoperable.

August7,1995,1228EDST:Offsitepowerconfiguration wasrestoredtothealternate "50%/50%"lineup.B.EVENT:OnAugust3,1995,atapproximately 1526EDST,withthereactoratapproximately 97%steadystatefullpower,theControlRoomreceivednumerousMainControlBoardannunciator alarms.AmongthesealarmswereL-20(12AXFMROR12ABUSTROUBLE),

J-5(IllORg12TRANSFORMER OUTOFSYNCH)iJ7(480VMAINORTIEBREAKERTRIP),J-9(SAFEGUARD BREAKERTRIP),andJ-32(EMERGENCY DIESELGEN1BPANEL).TheControlRoomoperators determined thatthefollowing eventshadoccurred:

oCircuit751(34.5KVoffsitepowersource)wasdeenergized o"B"train480Voltsafeguards buses16and17hadlosttheirpowersupplyfrom4160Voltbus12B(buses16and17hadbeenmomentarily deenergized) oThe"B"Emergency D/Ghadautomatically startedandwastiedtosafeguards buses16and17TheControlRoomoperators verifiedthatreactorcoolantsystemtemperature andpressurewerestable,andthattherewasnochangeinreactorpowerorturbineload.Theyperformed theappropriate actionsofAbnormalProcedure AP-ELEC.1 (Lossof12AAnd/Or12BBusses)tostabilize theplant.Theyverifiedthatthe"B"Emergency D/Gwasoperating andthatsafeguards buses16and17wereenergized.

TheControlRoomoperators observedthatCircuit751andbus12Bdisplayed zero(0)voltage.NRCFORH366A(5-92)

NRCFORH366A(5-92)U.S.NUCLEARREGULATORY CQIIISSIOH LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYQIBNO.3150-0104 EXPIRES5/31/95ESTIHATED BURDENPERRESPONSETOCOHPLYWITHTHISINFORHATIONCOLLECTIONREQUEST:50.0HRS.FORWARDCQDIENTSREGARDING BURDENESTIHATETOTHEIHFORHATIONANDRECORDSHANAGEHENT BRANCH(HNBB7714),U.S.NUCLEARREGULATORY COHHISSIOH, WASHIHGTOH, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3180-0104)

~OFFICEOFHANAGEHENT ANDBUDGETWASHIHGTOH DC20503.FACILITYNAHE(1)R.E.GinnaNuclearPowerPlantDOCKETNWER(2)YEAR0500024495LERNWBER(6)SEQUENTIAL NUMBER-007--REVISIONNUNBER00PAGE(3)4OF10TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)ThelossofpowerfromCircuit751resultedinundervoltage onsafeguards buses16and17,andthe"B"Emergency D/Gautomatically startedwithinten(10)secondsasperdesignandreenergized thesebuses.EnergyOperations personnel alsoidentified thelossofpowerfromCircuit751,andpromptlynotifiedGinnaControlRoomoperators of.thelossofpowerfromCircuit751,whichappearedtobecausedbyanoffsitelightning strikethataffectedCircuit751.TheControlRoomoperators referredtoEquipment Restoration procedure ER-ELEC.1 (Restoration ofOffsitePower)torestoreoffsitepowerto4160Voltbus12Band480Voltsafeguards buses16and17.TheControlRoomoperators closed4160Voltcircuitbreaker52/12BXtoenergizebus12BfromCircuit767,viathe12Btransformer, atapproximately 1602EDST.Atapproximately 1628EDST,safeguards buses16and17weretransferred toCircuit767fromthe"B"Emergency D/G.(Circuit767hadremainedinoperation, supplying "A"train480Voltsafeguards buses14and18,throughout theevent.)Atapproximately 1635EDST,August3;1995,the"B"Emergency D/Gwasstoppedandrealigned forautostandby,pendingperformance ofthepost-maintenance testing.EnergyOperations subsequently contacted theControlRoomoperators andconfirmed thatthelossofpowerfromCircuit751wascausedbyelectrical stormactivitythataffectedcircuitsatoffsiteStation204andtrippedthe"C"phaseinstantaneous overcurrent protective relayforCircuit751(atStation204),deenergizing thecircuit.RelayshadbeenresetatStation204,andCircuit751wasreenergized anddeclaredoperableatapproximately 1644EDST.Circuit751wasnotimmediately

'lineduptosupplyplantloads,butwasmaintained astheplant'sbackupsupplyofoffsitepowerratherthanrealigning theelectrical systemduringthethunderstorm conditions.

C.INOPERABLE STRUCTURES, COMPONENTS'R SYSTEMSTHATCONTRIBUTED TOTHEEVENT:NoneNRCFORH366A(5-92)

NRCFORM366A(5-92)U.SNUCLEARREGULATORY COMMISSION APPROVEOBYQNINO.3150-0104 EXPIRES5/31/95LICENSEEEVENTREPORT(LER)TEXTCONTINUATION FACILITYMANE(1)R.E.GinnaNuclearPowerPlantDOCKETNQIBER(2)05000244PAGE(3)5OF10LERNIBIBER(6)SEQUENTIAL NUMBERREVISIONNUMBERYEAR00--007--ESTIMATED BURDENPERRESPONSETOCOMPLYMITHTHISINFORMATION COLLECTIOH REQUEST:500HRS.FORMARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION ANDRECORDSMAHAGEMEHT BRANCH(MMBB7714),U.S.NUCLEARREGULATORY COMMISSION, NASHIHGTOH, DC20555-0001 ANDTOTHEPAPERMORK REDUCTION PROJECT(3180-0104),

OFFICEOFMANAGEMENT ANDBUDGETiJASHINGTON DC20503.TEXT(Ifmorespaceisrequired, useadditional copiesofMRCForm366A)(17)D.OTHERSYSTEMSORSECONDARY FUNCTIONS AFFECTED:

Thethunderstorm conditions alsoaffectedsome.telephone service.Atapproximately 1539EDST,theEmergency Notification System(ENS)lineforGinnaStationbecameinoperable.

TheShiftTechnical AdvisornotifiedtheNRCOperations CenterandtheUSNRCGinnaSeniorResidentInspector ofthelossoftheENSatapproximately 1544EDST.(TheENSwassubsequently restoredtooperablestatusatapproximately 1401EDSTonAugust4.)E.METHODOFDISCOVERY:

Thiseventwasimmediately apparentduetonumerousMainControlBoardalarmsandotherindications intheControlRoomwhenpowerfromCircuit751waslost.F.OPERATORACTION:Following'he undervoltage condition onbuses'16and17,the"B"Emergency D/Gautomatically startedandreenergized thesebuses.TheControlRoomoperators performed theappropriate actionstoverifythatthe"B"Emergency D/Gwasoperating andsafeguards buses16and17wereenergized.

TheControlRoomoperators manuallyrestarted the"B"and"C"containment recirculation fans,whichhadtrippedduetothelossofbus16.Themomentary lossofpowertobuses16and17causedthetripofthecommonsamplepumpformonitoring ofthecontainment (CNMT)atmosphere bychannelsR-10A(iodine),

R-11(particulate) andR-12(noblegas).TheControlRoomoperatormanuallyrestarted thecommonsamplepumpatapproximately 1535EDST.TheControlRoomoperators restoredoffsitepower(fromCircuit767)tobuses16and17,stoppedthe"B"Emergency D/G,andrealigned itforautostandby,priortostartingpost-maintenance testingoftheD/G.Subsequently, theShiftSupervisor notifiedtheNRCatapproximately 1748EDSTper10CFR50.72(b)(2)(ii),non-emergency fourhournotification.

HRCFORM366A(5-92)

NRCFORH.366A (5-92)U.S.NUCLEARREGULATORY COHHISSIOH LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYOHBHO.3150-0104 EXPIRES5/31/95ESTIHATED BURDENPERRESPOHSETOCOHPLYWITHTHISINFORHATIOH COLLECTION REQUEST:50.0HRS.FORWARDCOHHENTSREGARDING BURDENESTIHATETOTHEINFORHATIOH ANDRECORDSNANAGEHENT BRANCH(HNBB7714),U.S.HUCLEARREGULATORY COHHISSIOH,

'WASHINGTON, OC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(31500104),OFFICEOFHAHAGENENT ANDBUDGETWASHINGTON DC20503.FACILITYHAHE(1)R.E.GinnaNuclearPowerPlantDOCKETNINBER(2)05000244LERNIIIBER(6)SEDUENTIALNUHBER--007--REVISIONHUNGER00PAGE(3)6OF10TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)G.SAFETYSYSTEMRESPONSES:

Allsafeguards equipment functioned properly.

The"B"Emergency D/Gautomatically startedduetotheundervoltage condition onbuses16and17,displayed propervoltageandfrequency, andreenergized safeguards buses16and17tosupplyemergency power.Runningcontainment recirculation fansonbus16trippedasdesignedandweremanuallyrestarted asneededtorestorenormalcoolingtotheContainment.

Therunningservicewater,pumponbus17trippedasdesignedandthepumpselectedforautostart startedwhenpowerwasrestoredtobus17.III.CAUSEOFEVENTA.,IMMEDIATE CAUSE:Theautomatic actuation ofthe"B"Emergency D/Gwasduetoundervoltage onsafeguards buses16and17.B.INTERMEDIATE CAUSE:Theundervoltage onsafeguards buses16and17wasduetothelossofpowerfromCircuit751.C.ROOTCAUSE:Theunderlying causeofthelossofpowerfromCircuit751waselectrical stormactivitythataffectedcircuitsatoffsiteStation204andtrippedthe"C"phaseinstantaneous overcurrent protective relayforCircuit751(atStation204),deenergizing Circuit751.ThiseventisNUREG-1022 CauseCode(C),"External Cause".Thislossofpowerandsubsequent startofanEmergency D/GdoesnotmeettheNUMARC93-01,"Industry Guideline forMonitoring theEffectiveness ofMaintenance atNuclearPowerPlants",definition ofa"Maintenance Preventable Functional Failure".

HRCFORH366A(5-92)

NRCFORM366A(5-92)U.S.NUCLEARREGULATORY C(HHISSIOM LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYOHBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPOHSETOCOMPLYNITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORIIARDCOMMENTSREGARDIHG BURDENESTIMATETOTHEINFORMATION ANDRECORDSNAMAGEMENT BRANCH(HNBB7714),U.S.NUCLEARREGULATORY COMMISSION/

IIASHIMGTOH, DC20555-0001 ANDTOTHEPAPERNORK REDUCTION PROJECT(3150.0104),

OFFICEOFMANAGEMENT ANDBUDGETMASHINGTOM DC20503.FACILITYNAME(1)R.E.GinnaNuclearPowerPlantDOCKETMINBER(2)05000244LERMINBER(6SEQUENTIAL NUMBER95--007--REVISIONNUMBER00PAGE(3)7OF10TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)IV.ANALYSISOFEVENT:Thiseventisreportable inaccordance with10CFR50.73,LicenseeEventReportSystem,item(a)(2)(iv),whichrequiresareportof,"Anyeventorcondition thatresultedinamanualorautomatic actuation ofanyengineered safetyfeature(ESF),including thereactorprotection system(RPS)",inthatthestartingofthe"B"Emergency D/Gwasanautomatic actuation ofanESFsystem.Anassessment wasperformed considering boththesafetyconsequences andimplications ofthiseventwiththefollowing resultsandconclusions:

Therewerenooperational orsafetyconsequences orimplications attributed tothelossofCircuit751andstartoftheEmergency D/Gbecause:Allreactorcontrolandprotection systemsperformed asdesigned.

Althoughthemaintenance workforthe"B"Emergency D/Ghadbeencompleted, the"B"Emergency D/Gremainedadministratively inoperable.

Itwasavailable foroperation andsubsequently functioned asdesignedtoreenergize "B"trainsafeguards buses16and17.Whi'leinthiscondition, theplantelectrical powersystem(offsitepowersourcesandtheEmergency D/Gs)remainedwithintherequirements oftheLimitingCondition forOperation (LCO)ofTechnical Specification (TS)3.7.2.2.b.l, whichrequiresthatthe"A"Emergency D/Gbedemonstrated operablewithin'ne hourofthe"B"Emergency D/Gbeinginoperable andatleastonceper24hoursthereafter.

The"A"Emergency D/Ghadbeendemonstrated operablewithinonehourof0422EDSTonAugust3,sonofurtheractionswererequiredbyTSfortheshorttimethat,Circuit751wasalsoinoperable onAugust3;Circuit767remainedinoperation supplying powertothe"A"trainsafeguards buses;subsequently, Circuit767waslineduptosupplypowertothe"B"trainsafeguards busesalso,aspermitted byTS.HRCFORM366A(5-92)

NRCFORM366A(5-92)U.S.NUCLEARREGULATORY CQNISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYOMBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYMITHTHISINFORHATION COLLECTIOH REQUEST:50.0HRS.FORNARDCOHHEHTSREGARDING BURDENESTIHATETOTHEIHFORHATION ANDRECORDSMANAGEHENT BRANCH(MNBB7714),U.S.NUCLEARREGULATORY COMMISSION/

MASHINGTOH, DC20555-0001 ANDTOTHEPAPERNORK REDUCTION PROJECT(3140-0104),

OFFICEOFMANAGEMENT ANDBUDGETMASHINGTON DC20503FACILITYNAHE(1)R.E.GinnaNuclearPowerPlantDOCKETNQlBER(2)05000244YEARLERNIIIBER(6)SEQUENTIAL NUHBER-007-REVISIOHNUHBER00PAGE(3)8OF10TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)oRadiation monitorchannelsR-10A,R-11,andR-12weretemporarily lost.Thecommonsamplepumpwasmanuallyrestarted withinafewminutes,whichiswithintherequiredactiontimeofTS3.1.5.1.2 toobtainagrabsampleatleastonceevery24hours.Basedon.theabove,itcanbeconcluded thatthepublic'shealthandsafetywasassuredatalltimes.V.CORRECTIVE ACTIONA.ACTIONTAKENTORETURNAFFECTEDSYSTEMSTOPRE-EVENT NORMALSTATUS:oOffsitepowerwasrestoredtosafeguards buses16and17fromCircuit767,andthe"B"Emergency D/Gwasstoppedandrealigned forautostandby,priortothestartofpost-maintenance testingofthe"B"Emergency D/G.oCircuit751wasclearedforusebyEnergyOperations, protective relaysforCircuit751(atStation204)wereresetbyEnergyOperations, andCircuit751wasreenergized andrestoredtooperablestatus.B.ACTIONTAKENORPINNEDTOPREVENTRECURRENCE:

AsstatedinLER95-006,optionsforoffsitepowerconfiguration totheplantwillbereevaluated tooptimizereliability duringadverseweatherconditions.

(RefertoLER95-006,Revision0,DocketNo.50-244.)Theprimaryoptioncurrently beingevaluated wouldusean100%/0%"offsitepowerconfiguration asthepreferred configuration, withCircuit767normallysupplying powertoboththe"A"and"B"trainsafeguards buses.NRCFORM366A(5-92)

NRCFORH366A(5-92)U.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYOMBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYllITHTHISINFORHATIOH COLLECTIOH REGUEST:50.0MRS'ORHARD COMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION AHDREQ)RDSMANAGEMENT BRANCH(MHBB7714),U.S.NUCLEARREGULATORY COMMISSION, lIASHIHGTON, DC20555-0001 ANDTOTHEPAPERlSRK REDUCTION PROJECT(3180-0104),

OFFICEOFMANAGEMENT ANDBUDGETMASHINGTON DC20503.FACILITYNAME(1)R.E.GinnaNuclearPowerPlantDOCKETHWBER(2)0500024495LERMQIBER(6)SEQUENTIAL NUMBER-007--REVISIONHUMBER00PAGE(3)9OF10TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)VI.ADDITIONAL INFORMATION A.FAILEDCOMPONENTS:

NoneB.PREVIOUSLERsONSIMILAREVENTS:AsimilarLEReventhistorical searchwasconducted withthefollowing results:LERs91-002,92-007,94-012,and95-006weresimilareventswithsimilarrootcauses(startofanEmergency D/Gduetolossofoffsitepowerfromexternalcauses).C.SPECIALCOMMENTS:

NoneHRC'ORM366A(5-92)

~MRCFORM366A(5.92)U.S.MUCI.EARREGULATORY COWISSIOM APPROVEDBYQGIHO.3150-0104 EXPIRES5/31/95LICENSEEEVENTREPORT(LER)TEXTCONTINUATION FACILITYNAME(1)R.E.GinnaNuclearPowerPlantDOCKETNQIBER(2)LERNLNBER(6)PAGE(3)10OF10SEQUENTIAL NUMBERREVISIONNUMBERYEAR05000244g500--007--ESTIMATED BURDENPERRESPOHSETOCOMPLYMITHTHISINFORMATION COLLECTIOH REQUESTS50.0FORMARDCOMMENTSREGARDING BURDENESTIMATETOTNEINFORMATION AllORECORDSMANAGEMENT BRANCH(liHBB7714),U.S.NUCLEARREGULATORY COMMISSION, llASNIHGTOH, DC20555-0001 AMDTOTHEPAPERUORK REDUCTION PROJECT(3150.0104)

IOFFICEOFNAMAGENEHT AMDBUDGETMASHINGTON DC20503.TEXT(Ifmorespaceisrequired, useadditionaL copiesofNRCForm366A)(17)SI>>Ilail14CN$1$IN~QfONUW>>ICI>>>>1St/>>ICI$1aYONS1Sll41>>~IWSI.SCC~I>>~ICO>>IIO>>1$111Sl/~$1111\~OilISt>>ANICNCNONCO 14$>>.SIC~ICC~ICC>>CtlCIOCI4>>~O&/$Sl/ISOSSt/CCSO/SCPS>>/CSt/14$ISO>>or/Oalto/Is11$CSCOTSCCNCOOI/OU$14/llI4tCOON~Sl/41$1$$/IC11StICSt/O/tltO/lt

$1/441SO/tCICSSIC~IRSt/ONS14/I1St/OI$14/IS~>>I11$$NC$1/1I$14/I~11$$ICCI~ic>>11IIO10~CI,CIC~Ž~I>>IRNICCICC~ICC>>COIC>>COCAIC>>Sl/OISI1/II~I~KSt/O>>II1/IICCCI~IIRINNC:OCS~SNCNIC>>ONCSSCISt>>CC$1/~ISII/IOSI~ICSt/Ohl>>/ICCall>>lNO$1/OltItlttOIIICSt/NNCNCIC1$1IC(I)CORNO'$1/OI$11/SICICIllIR~CCIOIS11St/CNSIC/lICCCNtAC(I)CCIN>>IICN C$1/41111/11~I~NCHRCFORM366A(5-92)