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{{#Wiki_filter:~CATEGORY1REGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSXONNBR:9612260012DOC.DATE:96/12/20NOTARIZED:NOFACIL:50-389St.LuciePlant,Unit2,FloridaPower&LightCo.AUTH.NAMEAUTHORAFFILIATIONBENKEN,E.J.FloridaPower&LightCo.STALL,J.A,FloridaPower&LightCo.RECIP.NAMERECIPIENTAFFILIATIONDOCKET05000389
{{#Wiki_filter:~CATEGORY1REGULATORY INFORMATION DISTRIBUTION SYSTEM(RIDS)ACCESSXON NBR:9612260012 DOC.DATE:
96/12/20NOTARIZED:
NOFACIL:50-389 St.LuciePlant,Unit2,FloridaPower&LightCo.AUTH.NAMEAUTHORAFFILIATION BENKEN,E.J.
FloridaPower&LightCo.STALL,J.A, FloridaPower&LightCo.RECIP.NAME RECIPIENT AFFILIATION DOCKET05000389


==SUBJECT:==
==SUBJECT:==
LER96-005-00:on961206,determinedthatindependentoperabilityoftripcoilshadnotbeenadequatelytested.Causedbyinadequatesurveillanceprocedure.Performedtestingofcoils&revisedprocedures.W/961220ltr.DZSTRZBUTZONCODE:ZE22TCOFZESRECEZVED:LTR2ENCL/SZZE:TXTXE:50.73/50.9LicenseeEventReport(XER),IncidentRpt,etc.NOTES:RECIPIENTIDCODE/NAMEPD2-3PDINTERNAL:ACRSAEOD/SPD/RRABNRR/DE/ECGBNRR/DE/EMEBNRR/DRCH/HICBNRR/DRCH/HQMBNRR/DSSA/SPLBRES/DET/EIBEXTERNAL:LSTLOBBYWARDNOACMURPHY,G.ANRCPDRCOPIESLTTRENCL111122111111111111111111RECIPIENTIDCODE/NAMEWIENS,L.BFILECENELBNRR/DRCH/HHFBNRR/DRCH/HOLBNRR/DRPM/PECBNRR/DSSA/SRXBRGN2FXLE01LXTCOBRYCE,JHNOACPOORE,W.NUDOCSFULLTXTCOPIESLTTRENCL11221111111111111'111111DENOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMOWFNSD-5(EXT.415-2083)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!FULLTEXTCONVERSIONREQUIREDTOTALNUMBEROFCOPIESREQUIRED:LTTR26ENCL26 FloridaPower&LightCompany,P.O.Box128,FortPierce,FL34954.0128December20,1996L-96-33710CFR50.73U.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555Re:St.LucieUnit2DocketNo.50-389ReportableEvent:96-005DateofEvent:December6,1996OperationProhibitedbyTechnicalSpecifications'breakersTheattachedLicenseeEventReportisbeingsubmittedpursuanttotherequirementsof10CFR50.73toprovidenotificationofthesubjectevent.Verytrulyyours,J.A.StallVicePresidentSt.LuciePlantJAS/EJBAttachmentcc;RegionalAdministrator,USNRCRegionIISeniorResidentInspector,USNRC,St.LuciePlant96i22600i296i220PDRADQCK050003898PDRanFPLGroupcompanyM(t NRCFORM388(4.96)U.S.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORT(LER)(Seereverseforrequirednumberofdigits/charactersforeachblock)APPROVEDSYOMSNO.3160<104sxFSIEs04isorseESTIMATEDBURDENPERRESPONSEToCOMPLYWITHTHISMANDATOINFORMATIONCOLLECTIONREQUESTI60.0HRS.REPORTEDLESSONLEARNEDAREINCORPORATEDINTOTHEUCENSINOPROCESSANDFBACKTONOUSTRY.FORWARDCOMMENTSREGARDINGBURDENESTIMATTOTHEINFORMATIONANORECORDSMANAGEMENTBRANCHmeF33IUWNUCLEARREGIAATORYCOMMISSION.WASHINGTON.OC20666~1ANDTOTHEPAPERWORKREDUCTIONPROJECT(31600104),OFHCE0MANAGEMENTANDBUDGET,WASHINGTON,OC20603.FACILITYNAMEIllSTLUCIEUNIT2DOCKETNISASBl(2105000389PAGEnl1OF7TITLE14lOperationProhibitedbyTechnicalSpecificationsduetoInadequateSurveillanceTestingofReactorTripBreakers12OAY0696SEQUENTIALREVISIONNUMBERNUMBER96-005-00MONTHDAY122096FACIUTYNAMEN/AFACIUlYNAM6N/ADOCKETNUMSERDOCKETNUMBEROPERATIN0MODE(9)POWERLEVEL(10)<MC4':;<;:x"'.>320.2201(b)20.2203(a)(2)(i)20.2203(a){2){iii)20.2203(0)(2)(iv)20.2203(0){2)(v)20.2203(a)(3)(ii)50.38(c)(1)50.38(c)(2)50.73{a){2){i)60.73(a)(2)(ai)50.73(a){2)(v)50.73(a)(2)(vii)50.73(a)(2){viii)73.71OTHERSpecifyinAbstractbeloworInNRCForm3BBANAMEEdwinJ.Benken,LicensingEngineerTELEPHONENUMBEROnc4aahraacoda)(561)467-7156cAUBESYSTEMCOMPONENTMANUFACTURERREPORTABLEToNPRDSCAUSESYSTEMCOMPONENTREPORTABLEToNPROSYEB{Ifyee,completeEXPECTEDSUBMISSIONDATE).XNoEXPECTEDSUBMISSIONDATE(16)MONTHOAYYEARABSTRACT(umitto1400spaces,i.eapproximately15single.spacedtypewrittenlines)(18)OnDecember6,1996,St.LucieUnit2wasoperatinginMode1at100percentreactorpower.WhileperformingareviewasrequestedbyNRCGenericLetter96-01,"TestingofSafetyRelatedLogicCircuits,"FPLdeterminedthattheindependentoperabilityoftripcoilsassociatedwiththeReactorProtectiveSystem(RPS)TripCircuitBreakers(TCB)hadnotbeenadequatelytestedbysurveillanceprocedure.TheappropriateTechnicalSpecificationActionrequirementswereimplementedforfailuretoperformasurveillancerequirement.AdditionaltestingwasinitiatedandsubsequentlycompletedsatisfactorilyperTechnicalSpecificationrequirements.Thecauseoftheeventwasaninadequatesurveillanceprocedurefortestingtheoperationofthereactortripcircuitbreakers.Correctiveactionsinclude:1)OperabilitytestingofthetripcoilswasperformedtoincludeadditionaltestingofelectricalcontactsintheTCBcircuitpaths.2)ThesurveillanceproceduregoverningthetestingoftheReactorProtectiveSystemlogicwaschangedtoincludetestingtherequiredcircuitrycontacts.3)AdditionalsafetyrelatedelectricalcircuitryiscontinuingtobereviewedwithregardtotestingadequacyinaccordancewiththeactionsrequestedinNRCGenericLetter96-01.
LER96-005-00:on 961206,determined thatindependent operability oftripcoilshadnotbeenadequately tested.Causedbyinadequate surveillance procedure.
NRCFORM366AI4-9SILICENSEEEVENTREPORT(LER)TEXTCONTINUATIONU.S.NUCLEARREGULATORYCOMMISSIST.LUCIEUNIT205000389YEARSEQUENTIALREVISION96-005-002OF7TEXTilfmorespeceisrequired,useedditionelcopiesoffVRCf'orm366AiI17IOnDecember6,1996,withSt.LucieUnit2operatinginMode1at100percentpower,FPLengineeringpersonneldeterminedthattheindependentoperabilityoftheundervoltageandshunttripelectricallogicpathsfortheReactorTripCircuitBreakers(TCBs)(EIIS:JC)maynothavebeenadequatelytestedbycurrentSt.LucieUnit2procedures.ThisdeterminationwasmadefollowingareviewofasimilarconditionfoundatPaloVerdeStationandanassessmentofNRCGenericLetter,96-01,"TestingofSafetyRelatedLogicCircuits"forapplicabilitytoSt.LuciePlant.St.LucieUnit2TechnicalSpecification(TS)4.3.1.1,requiresthatafunctionaltestbeperformedatleastonceper18monthsorfollowingmaintenanceoradjustmentofthereactortripcircuitbreakerstoverifytheindependentoperabilityoftheundervoltageandshunttrips.At1705onDecember6,1996,basedupontheabovedetermination,OperationsinvokedTechnicalS,cification4.0.3.forfailuretoperformasurveillancerequirementwithintheallowedsurveillanceinterval.AConditionReport(CR)wasinitiatedtoassessthevalidityofthetestingrequirementsandreviewtheoperabilityoftheTCBs.TS4.0.3specifiesthatfailuretoperformasurveillancerequirementwithintheallowedsurveillanceintervalshallconstitutenoncompliancewiththeoperabilityrequirementsforaLimitingConditionforOperation(LCO)~TS4.0.3allowsthatactionrequirementsmaybedelayedforupto24hourstopermitthecompletionofasurveillancewhentheallowableoutagetimelimitsoftheLCOactionrequirementsarelessthan24hours.Followingdiscoveryoftheabovecondition,functionaltestingwasinitiatedat2145,onDecember6,1996,toverifytheindependentoperabilityoftheundervoltageandshunttripsforthereactorTCBs.Thistestingwascompletedsatisfactorilyat2215onDecember6,1996,andTS4.0.3wasthenexited.Thecauseoftheeventwasaninadequatesurveillancetestprocedure.OperatingProcedure2-1400059,"ReactorProtectionSystem-PeriodicLogicMatrixTest,"containstheinstructionsforperformanceoftheoperabilitytestfortheReactorTripCircuitBreakersshunttripandundervoltagetripdevices(coils).Thesurveillancetestinstructionsoftheprocedureverifiedthesatisfactoryoperationofbothoftheaboveshuntandundervoltagetripdevices,andwereconsistentwithvendorrecommendations,however,thetestdidnotverifytheindependentoperationoftheelectricalcontactswhichoperatetheshuntandundervoltagetripcoils.Atthetimeoftheevent,thesurveillanceadequacyofthereactortripcircuitbreakershadbeenidentifiedforadditionalengineeringreviewinaccordancewiththeschedulereferencedintheFPLresponsetoGenericLetter96-01,datedApril18,1996.Thiseventisreportableunder10CFR50.73(a)(2)(i)(B)as"anyoperationorconditionprohibitedbytheplant'sTechnicalSpecifications."St.LucieUnit2TS4.3.1.1requiresthateachreactorprotectiveinstrumentationchannelbedemonstratedoperablebytheperformanceofthechannelcheck,channelcalibrationandchannelfunctionaltestoperationsfortheModesandfrequenciesshownintable4.3-".NRCFORM388AI49SI NRCFORM368AI4-96ILICENSEEEVENTREPORT(LER)TEXTCONTINUATIONU.S.NUCLEARREGULATORYCOMMISSIST.LUCIEUNIT205000389YEARSEQUENTIALREVISION96-005-003OF7TEXT/ifmorespecsisrequired,useedditionelcopiesofNRCcform366A/I17ITStable4.3.1requiresthatatleastonceper18monthsandfollowingmaintenanceandadjustmentofthereactortripbreakers,thechannelfunctionaltestshallincludeverificationoftheindependentoperabilityoftheundervoltageandshunttrips.Followinga,determinationthattheindependentoperabilityoftheaboveundervoltageandshunttripdeviceshadnotbeenadequatelytestedatSt.LuciaUnit2,OperationspersonnelimplementedthesurveillancerequirementsofTS4.0.3.Aspreviouslydiscussed,TS4.0.3specifiesthatfailuretoperformasurveillancerequirementwithintheallowedsurveillanceintervalconstitutesnoncompliancewiththeoperabilityrequirementsfo'ranLCOandpermitsactionrequirementstobedelayedforupto24hourstofacilitatecompletionofthesurveillance.FPLsatisfactorilyperformedtheadditional,requiredtestingoftheelectricallogicpathsa<<ociatedwiththereactortripcircuitbreakerswithintheallowabletimeconstraintsofTS4.0.3.ThereactortripcircuitbreakersareafunctionalunitoftheReactorProtectiveSystem(RPS)instrumentationatSt.LuciePlant.TheoperabilityoftheRPSinstrumentationandbypassesensuresthat1)theassociatedreactortripwillbeinitiatedwhenamonitoredparameterreachesitssetpoint,2)thespecifiedcoincidencelogicismaintained,3)sufficientredundancyismaintainedtopermitachanneltobeoutofservicefortestingormaintenance,and4)sufficientsystemfunctionalcapabilityisavailablefromdiverseparameters.TheRPSisdesignedsothatanysinglefailurewithinthesystemwillnotpreventproperprotectiveactionatthesystemlevelwhenrequired.TherearefourReactorTripChannelsassociatedwiththeRPS.Atwo-out-of-fourRPSlogictripsignalresultsinthedeenergizationoffourtrippathrelays,whichinturnresultsinthedeenergizationofundervoltagecoilsandenergizationofshunttripcoilsoneightreactorTCBs(RefertoFigure1).EitherofthetwotripcoilsassociatedwithareactorTCBiscapableoftrippingthebreakerfromanRPSactuation.BothofthetrippathsareactuatedbythesameRPSrelayandusedifferentsetsofrelaycontactstoactuatetheirassociatedtripcoils(RefertoFigure2).Oneor>>bothofthesecontactschangingstatewillresultintheopeningoftheTCB.ThefollowingtestsareperformedatSt.LucietoverifytheoperabilityofthereactorTCBs:TheTripCoilofeachreactorTCBistestedbyuseofatestpush-buttonwhichenergizestheshunttripcoilandopensthebreaker.Thistestisconductedatleastevery18monthsandfollowingmaintenanceoradjustmentoftheTCB.2.TheUndervoltage(UV)CoilofeachreactorTCBistestedbyremovingthepowersupplyfusewhichdeenergizestheUVcoilandopensthebreaker.Thistestisalsoconductedevery18monthsandfollowingmaintenanceoradjustmentoftheTCB.3.TheRPSPeriodicLogicMatrixTestisperformedeachmonthtoverifythatRPStrippathrelaysfunctioncorrectlyandtheTCBsopenwhenrequired.NRCFORM368AI4-96I NRCFORM368AI4-9SILICENSEEEVENTREPORT(LER)TEXTCONTINUATIONU.S.NUCLEARREGUlATORYCOMINISSIOST.LUCIEUNIT2YEARSEQUENTIALREVISION0500038996-005-004OF7TEXT(Ifmorespecsisrequired,useedditionelcopiesofNRC&rm368AJI17)Asdescribedbytheabovetests,theabilityofthereactortripbreakerstoopenonanRPSactuationsignalisdemonstratedbytheRPSLogicMatrixTest,whichisperformedmonthly.Additionally,theoperabilityoftheTCBtripcoilsandundervoltagecoilsisdemonstratedatleastevery18months.Performanceoftheabovetesting,however,doesnotspecificallyverifythatthecontactsintheelectricallogicpathschangestatetoactuatetheundervoltageorshunttripcoils.IndividualcontactsthatperformasafetyfunctionarerequiredtobetestedinaccordancewiththeguidanceprovidedbyGenericLetter96-01.Subsequenttothisevent,FPLEngineeringperformedareviewofthetestingrequirementsassociatedwiththereactorTCBs.ThisreviewdeterminedthatwhilethepotentialforanundetectedfailureofonecontactintheelectricalflowpathtoanRPSTCBexistsduringperformanceoftheRPSLogicMatrixTest,thiswillnotresultinthefailureoftheTCBtotrip.Thedualpath,electricalarrangementassociatedwitheachreactorTCBisnotdesignedasaredundantfeature,asthereisnoseparationorisolation,andcommonequipmentisusedinbothpaths.Thetwopathsarediverse,however,inthatdifferentmechanisms(energizationvs.deenergizationandtheuseofdifferenttripcoils)areprovidedfoincreasedreliabilityofthetripmechanism.AreviewofTCBsurveillancetestsperformedatSt.LucieUnit1determinedthatatUnit1,theRPSLogicMatrixTestProcedure,performedmonthly,includesaverificationofindicatinglights(uniquetoUnit1)providedinboththeshuntandundervoltagetrippaths.TheseindicatinglightsarenotavailableatSt.LucieUnit2.Additionally,St.LucieUnit1TechnicalSpecificationsdonotrequireafunctionalcheckbeperformedoftheindependentoperabilityoftheshuntandundervoltagetrippaths.Therefore,thisconditionisnotapplicabletoSt.LucieUnit1.AdditionalsurveillancetestingperformedasaresultofthiseventsatisfactorilydemonstratedthattheelectricallogiccontactsresponsibleforactuatingtheundervoltageandshunttripcoilsonthereactorTCBswereoperational.Noreactortrippathsweredisabledasaresultofthesubjecttestinginadequacy,andsufficientsystemdiversityandfunctionalcapabilitywasmaintained.Basedupontheabove,theprotectionofthe'healthandsafetyofthepublicwasnotadverselyaffectedbytheevent.TestingoftheelectricallogiccontactsforthereactortripcircuitbreakerswassatisfactorilyperformedonDecember6,1996.2.TheSt.LucieUnit2ReactorProtectionSystem-PeriodicLogicMatrixTestProcedure(2-1400059)wasrevisedtoincludeadditionalverificationofTripRelayContactoperationduringthe18monthsurveillanceperformance.NRCFORM388AI4.96I NRCFORM366A4.95ILICENSEEEVENTREPORT(LER)TEXTCONTINUATIONU.S.NUCLEARREGULATORYCOMMISSIOST.LUCIEUNIT205000389YEARSEQUENTIALREVISION96-005-005OF7TEXT(Ifmorespaceisrequired,useadditionalcopiesofNRCForm368AJI17I3.InaccordancewithGenericLetter96-01,FPLiscontinuingtoreviewapplicablesafetyrelatelogiccircuitryandtestingprocedurestoensurethatallcircuitcomponentsrequiredtobetestedareadequatelyaddressedbysurveillanceprocedures.NoneNoneNRCFORM386AH-9S)
Performed testingofcoils&revisedprocedures.W/961220 ltr.DZSTRZBUTZON CODE:ZE22TCOFZESRECEZVED:LTR 2ENCL/SZZE:TXTXE:50.73/50.9 LicenseeEventReport(XER),IncidentRpt,etc.NOTES:RECIPIENT IDCODE/NAME PD2-3PDINTERNAL:
NRCFORM388A14-96)LICENSEEEVENTREPORT(LER)TEXTCONTINUATIONU.S.NUCLEARREGULATORYCOMMISSIST.LUCIEUNIT205000389YEARSEQUENTIALREVISION96-005-006OF7TEXTfifmorespaceisreqvired,useadditionalcopiesoflIl'RCForm866AlI17IREACTORPROTECTIYESYSTEMSIMPLIFIEDLOGICDIAGRAMI238$7891091238$8789109I234$8789109I238$8789109INPUTSFROMIBSSMEAsUREMENTaIANNELSCHANNELATRIPUNITSCHANNEL8CHANNELCCHANNELDLCGIcA.BLOGICANLOGICA0LOGICMATRICESIA87ASlA8lIACIACIiAO2LOGICMATIYKRELAYS8-CLOGICB.DLOGICC.DLOGIC8818Ct8CI8CiKl1187I1871SD4CO>807807COIMA120VACINSTRUMENTBVSMB120YACINSTRUMENTBVSMC120VACINSTRUMENTBUSMD120VACINSTRUMENTBUSTRIPPA1113AB1AC1AD1BCI801C01AB2AC2AD2BC2BD2C024'ACA80VACBVS'IBVS2MAINCIRCVITBREAKERSMOTORGENERATORS~240VACA83AC3A03BC3803C03A84AC4A04BC4BD4C04TRIPCIRCIATBREAKERCONTROLRELAYS12$YDCl(USB((KAIMANUALTT8PI4~IIMANUAL778P27IKI12$/USAKIUVSTSTTTYPaRCUITBREAKERSUY12$YDCI(USAKA12$YDCBVSB+STST~aamwangaITY9DENOTESADDITeNALREACTORTRIPUNITONDIAT2CCWLOSSOFFLOW81DMDUALCEDMPOWERSUPPLIESCEDMCONTROLSYSTEMUeIYIDVALCEDMPOWERSUPPUESGEOMPOWERSUPPUESPIRCOD111807.CEDMCEDMCEDMCOILSCOILSGOESCEDMCEDMCEDMCONTROLELEMENTCaLSCalsGalsDRIVEMECHANISMSNRCFORM388A14.96)
ACRSAEOD/SPD/RRAB NRR/DE/ECGB NRR/DE/EMEB NRR/DRCH/HICB NRR/DRCH/HQMB NRR/DSSA/SPLB RES/DET/EIB EXTERNAL:
NRCFORM388ALICENSEEEVENTREPORT(LER)TEXTCONTINUATIONU.S.NUCLEARREGULATORYCOMMISSIST.LUCIEUNIT205000389YEARSEQUENTIALREVISION96-005-00'7OF7TEXT(ifmorespeceisreqirired,IrseeddidoneicopiesofNRCFarm3M4lI17)REACTORTRIPCIRCUITBREAKERSIMPLIFIEDWIRINGDIAGRAIYI(TYPICAL)NORMALLYCLOSEDINOTTESTEOIIIOEPENOENTLY)NORMALLYOPENINOTTESTEOINOEPENOENTI.Y)TESTPUSHBUTTONBKS12m)I?EMERGTRIPPUSHBUTTONMANUALTRIPPUSHBUTTON(RTGB)-REEDPSCLOSESONTESTUNDERVOLTAGEUVDCOILREEHEBRZSH?SPENTKBSHUNTTRIPCOILBKBQlZEBTC}}
LSTLOBBYWARDNOACMURPHY,G.A NRCPDRCOPIESLTTRENCL111122111111111111111111RECIPIENT IDCODE/NAME WIENS,L.BFILECENELBNRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DRPM/PECB NRR/DSSA/SRXB RGN2FXLE01LXTCOBRYCE,JHNOACPOORE,W.NUDOCSFULLTXTCOPIESLTTRENCL11221111111111111'111111DENOTETOALL"RIDS"RECIPIENTS:
PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMOWFNSD-5(EXT.
415-2083)
TOELIMINATE YOURNAMEFROMDISTRIBUTION LISTSFORDOCUMENTS YOUDON'TNEED!FULLTEXTCONVERSION REQUIREDTOTALNUMBEROFCOPIESREQUIRED:
LTTR26ENCL26 FloridaPower&LightCompany,P.O.Box128,FortPierce,FL34954.0128 December20,1996L-96-33710CFR50.73U.S.NuclearRegulatory Commission Attn:DocumentControlDeskWashington, D.C.20555Re:St.LucieUnit2DocketNo.50-389Reportable Event:96-005DateofEvent:December6,1996Operation Prohibited byTechnical Specifications
'breakers TheattachedLicenseeEventReportisbeingsubmitted pursuanttotherequirements of10CFR50.73toprovidenotification ofthesubjectevent.Verytrulyyours,J.A.StallVicePresident St.LuciePlantJAS/EJBAttachment cc;RegionalAdministrator, USNRCRegionIISeniorResidentInspector, USNRC,St.LuciePlant96i22600i2 96i220PDRADQCK050003898PDRanFPLGroupcompanyM(t NRCFORM388(4.96)U.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)(Seereverseforrequirednumberofdigits/characters foreachblock)APPROVEDSYOMSNO.3160<104sxFSIEs04isorseESTIMATED BURDENPERRESPONSEToCOMPLYWITHTHISMANDATOINFORMATION COLLECTION REQUESTI60.0HRS.REPORTEDLESSONLEARNEDAREINCORPORATED INTOTHEUCENSINOPROCESSANDFBACKTONOUSTRY.FORWARDCOMMENTSREGARDING BURDENESTIMATTOTHEINFORMATION ANORECORDSMANAGEMENT BRANCHmeF33IUWNUCLEARREGIAATORY COMMISSION.
WASHINGTON.
OC20666~1ANDTOTHEPAPERWORK REDUCTION PROJECT(31600104),
OFHCE0MANAGEMENT ANDBUDGET,WASHINGTON, OC20603.FACILITYNAMEIllSTLUCIEUNIT2DOCKETNISASBl(2105000389PAGEnl1OF7TITLE14lOperation Prohibited byTechnical Specifications duetoInadequate Surveillance TestingofReactorTripBreakers12OAY0696SEQUENTIAL REVISIONNUMBERNUMBER96-005-00MONTHDAY122096FACIUTYNAMEN/AFACIUlYNAM6N/ADOCKETNUMSERDOCKETNUMBEROPERATIN0 MODE(9)POWERLEVEL(10)<MC4':;<;:x"'.>
320.2201(b)20.2203(a)
(2)(i)20.2203(a){2){iii)20.2203(0)(2)(iv)20.2203(0){2)(v)20.2203(a)
(3)(ii)50.38(c)(1) 50.38(c)(2)50.73{a){2){i)60.73(a)(2)(ai) 50.73(a){2)(v)50.73(a)(2)(vii) 50.73(a)(2)
{viii)73.71OTHERSpecifyinAbstractbeloworInNRCForm3BBANAMEEdwinJ.Benken,Licensing EngineerTELEPHONE NUMBEROnc4aahraacoda)(561)467-7156cAUBESYSTEMCOMPONENT MANUFACTURER REPORTABLE ToNPRDSCAUSESYSTEMCOMPONENT REPORTABLE ToNPROSYEB{Ifyee,completeEXPECTEDSUBMISSION DATE).XNoEXPECTEDSUBMISSION DATE(16)MONTHOAYYEARABSTRACT(umitto1400spaces,i.eapproximately 15single.spacedtypewritten lines)(18)OnDecember6,1996,St.LucieUnit2wasoperating inMode1at100percentreactorpower.Whileperforming areviewasrequested byNRCGenericLetter96-01,"TestingofSafetyRelatedLogicCircuits,"
FPLdetermined thattheindependent operability oftripcoilsassociated withtheReactorProtective System(RPS)TripCircuitBreakers(TCB)hadnotbeenadequately testedbysurveillance procedure.
Theappropriate Technical Specification Actionrequirements wereimplemented forfailuretoperformasurveillance requirement.
Additional testingwasinitiated andsubsequently completed satisfactorily perTechnical Specification requirements.
Thecauseoftheeventwasaninadequate surveillance procedure fortestingtheoperation ofthereactortripcircuitbreakers.
Corrective actionsinclude:1)Operability testingofthetripcoilswasperformed toincludeadditional testingofelectrical contactsintheTCBcircuitpaths.2)Thesurveillance procedure governing thetestingoftheReactorProtective Systemlogicwaschangedtoincludetestingtherequiredcircuitry contacts.
3)Additional safetyrelatedelectrical circuitry iscontinuing tobereviewedwithregardtotestingadequacyinaccordance withtheactionsrequested inNRCGenericLetter96-01.
NRCFORM366AI4-9SILICENSEEEVENTREPORT(LER)TEXTCONTINUATION U.S.NUCLEARREGULATORY COMMISSIST.LUCIEUNIT205000389YEARSEQUENTIAL REVISION96-005-002OF7TEXTilfmorespeceisrequired, useedditionel copiesoffVRCf'orm366AiI17IOnDecember6,1996,withSt.LucieUnit2operating inMode1at100percentpower,FPLengineering personnel determined thattheindependent operability oftheundervoltage andshunttripelectrical logicpathsfortheReactorTripCircuitBreakers(TCBs)(EIIS:JC) maynothavebeenadequately testedbycurrentSt.LucieUnit2procedures.
Thisdetermination wasmadefollowing areviewofasimilarcondition foundatPaloVerdeStationandanassessment ofNRCGenericLetter,96-01,"TestingofSafetyRelatedLogicCircuits" forapplicability toSt.LuciePlant.St.LucieUnit2Technical Specification (TS)4.3.1.1,requiresthatafunctional testbeperformed atleastonceper18monthsorfollowing maintenance oradjustment ofthereactortripcircuitbreakerstoverifytheindependent operability oftheundervoltage andshunttrips.At1705onDecember6,1996,basedupontheabovedetermination, Operations invokedTechnical S,cification 4.0.3.forfailuretoperformasurveillance requirement withintheallowedsurveillance interval.
ACondition Report(CR)wasinitiated toassessthevalidityofthetestingrequirements andreviewtheoperability oftheTCBs.TS4.0.3specifies thatfailuretoperformasurveillance requirement withintheallowedsurveillance intervalshallconstitute noncompliance withtheoperability requirements foraLimitingCondition forOperation (LCO)~TS4.0.3allowsthatactionrequirements maybedelayedforupto24hourstopermitthecompletion ofasurveillance whentheallowable outagetimelimitsoftheLCOactionrequirements arelessthan24hours.Following discovery oftheabovecondition, functional testingwasinitiated at2145,onDecember6,1996,toverifytheindependent operability oftheundervoltage andshunttripsforthereactorTCBs.Thistestingwascompleted satisfactorily at2215onDecember6,1996,andTS4.0.3wasthenexited.Thecauseoftheeventwasaninadequate surveillance testprocedure.
Operating Procedure 2-1400059,"ReactorProtection System-PeriodicLogicMatrixTest,"containstheinstructions forperformance oftheoperability testfortheReactorTripCircuitBreakersshunttripandundervoltage tripdevices(coils).Thesurveillance testinstructions oftheprocedure verifiedthesatisfactory operation ofbothoftheaboveshuntandundervoltage tripdevices,andwereconsistent withvendorrecommendations, however,thetestdidnotverifytheindependent operation oftheelectrical contactswhichoperatetheshuntandundervoltage tripcoils.Atthetimeoftheevent,thesurveillance adequacyofthereactortripcircuitbreakershadbeenidentified foradditional engineering reviewinaccordance withtheschedulereferenced intheFPLresponsetoGenericLetter96-01,datedApril18,1996.Thiseventisreportable under10CFR50.73(a)(2)(i)(B) as"anyoperation orcondition prohibited bytheplant'sTechnical Specifications."
St.LucieUnit2TS4.3.1.1requiresthateachreactorprotective instrumentation channelbedemonstrated operablebytheperformance ofthechannelcheck,channelcalibration andchannelfunctional testoperations fortheModesandfrequencies shownintable4.3-".NRCFORM388AI49SI NRCFORM368AI4-96ILICENSEEEVENTREPORT(LER)TEXTCONTINUATION U.S.NUCLEARREGULATORY COMMISSIST.LUCIEUNIT205000389YEARSEQUENTIAL REVISION96-005-003OF7TEXT/ifmorespecsisrequired, useedditionel copiesofNRCcform366A/I17ITStable4.3.1requiresthatatleastonceper18monthsandfollowing maintenance andadjustment ofthereactortripbreakers, thechannelfunctional testshallincludeverification oftheindependent operability oftheundervoltage andshunttrips.Following a,determination thattheindependent operability oftheaboveundervoltage andshunttripdeviceshadnotbeenadequately testedatSt.LuciaUnit2,Operations personnel implemented thesurveillance requirements ofTS4.0.3.Aspreviously discussed, TS4.0.3specifies thatfailuretoperformasurveillance requirement withintheallowedsurveillance intervalconstitutes noncompliance withtheoperability requirements fo'ranLCOandpermitsactionrequirements tobedelayedforupto24hourstofacilitate completion ofthesurveillance.
FPLsatisfactorily performed theadditional, requiredtestingoftheelectrical logicpathsa<<ociated withthereactortripcircuitbreakerswithintheallowable timeconstraints ofTS4.0.3.Thereactortripcircuitbreakersareafunctional unitoftheReactorProtective System(RPS)instrumentation atSt.LuciePlant.Theoperability oftheRPSinstrumentation andbypassesensuresthat1)theassociated reactortripwillbeinitiated whenamonitored parameter reachesitssetpoint,2)thespecified coincidence logicismaintained, 3)sufficient redundancy ismaintained topermitachanneltobeoutofservicefortestingormaintenance, and4)sufficient systemfunctional capability isavailable fromdiverseparameters.
TheRPSisdesignedsothatanysinglefailurewithinthesystemwillnotpreventproperprotective actionatthesystemlevelwhenrequired.
TherearefourReactorTripChannelsassociated withtheRPS.Atwo-out-of-four RPSlogictripsignalresultsinthedeenergization offourtrippathrelays,whichinturnresultsinthedeenergization ofundervoltage coilsandenergization ofshunttripcoilsoneightreactorTCBs(RefertoFigure1).Eitherofthetwotripcoilsassociated withareactorTCBiscapableoftrippingthebreakerfromanRPSactuation.
BothofthetrippathsareactuatedbythesameRPSrelayandusedifferent setsofrelaycontactstoactuatetheirassociated tripcoils(RefertoFigure2).Oneor>>bothofthesecontactschangingstatewillresultintheopeningoftheTCB.Thefollowing testsareperformed atSt.Lucietoverifytheoperability ofthereactorTCBs:TheTripCoilofeachreactorTCBistestedbyuseofatestpush-button whichenergizes theshunttripcoilandopensthebreaker.Thistestisconducted atleastevery18monthsandfollowing maintenance oradjustment oftheTCB.2.TheUndervoltage (UV)CoilofeachreactorTCBistestedbyremovingthepowersupplyfusewhichdeenergizes theUVcoilandopensthebreaker.Thistestisalsoconducted every18monthsandfollowing maintenance oradjustment oftheTCB.3.TheRPSPeriodicLogicMatrixTestisperformed eachmonthtoverifythatRPStrippathrelaysfunctioncorrectly andtheTCBsopenwhenrequired.
NRCFORM368AI4-96I NRCFORM368AI4-9SILICENSEEEVENTREPORT(LER)TEXTCONTINUATION U.S.NUCLEARREGUlATORY COMINISSIO ST.LUCIEUNIT2YEARSEQUENTIAL REVISION0500038996-005-004OF7TEXT(Ifmorespecsisrequired, useedditionel copiesofNRC&rm368AJI17)Asdescribed bytheabovetests,theabilityofthereactortripbreakerstoopenonanRPSactuation signalisdemonstrated bytheRPSLogicMatrixTest,whichisperformed monthly.Additionally, theoperability oftheTCBtripcoilsandundervoltage coilsisdemonstrated atleastevery18months.Performance oftheabovetesting,however,doesnotspecifically verifythatthecontactsintheelectrical logicpathschangestatetoactuatetheundervoltage orshunttripcoils.Individual contactsthatperformasafetyfunctionarerequiredtobetestedinaccordance withtheguidanceprovidedbyGenericLetter96-01.Subsequent tothisevent,FPLEngineering performed areviewofthetestingrequirements associated withthereactorTCBs.Thisreviewdetermined thatwhilethepotential foranundetected failureofonecontactintheelectrical flowpathtoanRPSTCBexistsduringperformance oftheRPSLogicMatrixTest,thiswillnotresultinthefailureoftheTCBtotrip.Thedualpath,electrical arrangement associated witheachreactorTCBisnotdesignedasaredundant feature,asthereisnoseparation orisolation, andcommonequipment isusedinbothpaths.Thetwopathsarediverse,however,inthatdifferent mechanisms (energization vs.deenergization andtheuseofdifferent tripcoils)areprovidedfoincreased reliability ofthetripmechanism.
AreviewofTCBsurveillance testsperformed atSt.LucieUnit1determined thatatUnit1,theRPSLogicMatrixTestProcedure, performed monthly,includesaverification ofindicating lights(uniquetoUnit1)providedinboththeshuntandundervoltage trippaths.Theseindicating lightsarenotavailable atSt.LucieUnit2.Additionally, St.LucieUnit1Technical Specifications donotrequireafunctional checkbeperformed oftheindependent operability oftheshuntandundervoltage trippaths.Therefore, thiscondition isnotapplicable toSt.LucieUnit1.Additional surveillance testingperformed asaresultofthiseventsatisfactorily demonstrated thattheelectrical logiccontactsresponsible foractuating theundervoltage andshunttripcoilsonthereactorTCBswereoperational.
Noreactortrippathsweredisabledasaresultofthesubjecttestinginadequacy, andsufficient systemdiversity andfunctional capability wasmaintained.
Basedupontheabove,theprotection ofthe'health andsafetyofthepublicwasnotadversely affectedbytheevent.Testingoftheelectrical logiccontactsforthereactortripcircuitbreakerswassatisfactorily performed onDecember6,1996.2.TheSt.LucieUnit2ReactorProtection System-PeriodicLogicMatrixTestProcedure (2-1400059)wasrevisedtoincludeadditional verification ofTripRelayContactoperation duringthe18monthsurveillance performance.
NRCFORM388AI4.96I NRCFORM366A4.95ILICENSEEEVENTREPORT(LER)TEXTCONTINUATION U.S.NUCLEARREGULATORY COMMISSIO ST.LUCIEUNIT205000389YEARSEQUENTIAL REVISION96-005-005OF7TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm368AJI17I3.Inaccordance withGenericLetter96-01,FPLiscontinuing toreviewapplicable safetyrelatelogiccircuitry andtestingprocedures toensurethatallcircuitcomponents requiredtobetestedareadequately addressed bysurveillance procedures.
NoneNoneNRCFORM386AH-9S)
NRCFORM388A14-96)LICENSEEEVENTREPORT(LER)TEXTCONTINUATION U.S.NUCLEARREGULATORY COMMISSIST.LUCIEUNIT205000389YEARSEQUENTIAL REVISION96-005-006OF7TEXTfifmorespaceisreqvired, useadditional copiesoflIl'RCForm866AlI17IREACTORPROTECTIYE SYSTEMSIMPLIFIED LOGICDIAGRAMI238$7891091238$8789109I234$8789109I238$8789109INPUTSFROMIBSSMEAsUREMENT aIANNELSCHANNELATRIPUNITSCHANNEL8CHANNELCCHANNELDLCGIcA.BLOGICANLOGICA0LOGICMATRICESIA87ASlA8lIACIACIiAO2LOGICMATIYKRELAYS8-CLOGICB.DLOGICC.DLOGIC8818Ct8CI8CiKl1187I1871SD4CO>807807COIMA120VACINSTRUMENT BVSMB120YACINSTRUMENT BVSMC120VACINSTRUMENT BUSMD120VACINSTRUMENT BUSTRIPPA1113AB1AC1AD1BCI801C01AB2AC2AD2BC2BD2C024'ACA80VACBVS'IBVS2MAINCIRCVITBREAKERSMOTORGENERATORS
~240VACA83AC3A03BC3803C03A84AC4A04BC4BD4C04TRIPCIRCIATBREAKERCONTROLRELAYS12$YDCl(USB((KAIMANUALTT8PI4~IIMANUAL778P27IKI12$/USAKIUVSTSTTTYPaRCUITBREAKERSUY12$YDCI(USAKA12$YDCBVSB+STST~aamwangaITY9DENOTESADDITeNAL REACTORTRIPUNITONDIAT2CCWLOSSOFFLOW81DMDUALCEDMPOWERSUPPLIESCEDMCONTROLSYSTEMUeIYIDVAL CEDMPOWERSUPPUESGEOMPOWERSUPPUESPIRCOD111807.
CEDMCEDMCEDMCOILSCOILSGOESCEDMCEDMCEDMCONTROLELEMENTCaLSCalsGalsDRIVEMECHANISMS NRCFORM388A14.96)
NRCFORM388ALICENSEEEVENTREPORT(LER)TEXTCONTINUATION U.S.NUCLEARREGULATORY COMMISSIST.LUCIEUNIT205000389YEARSEQUENTIAL REVISION96-005-00'7OF7TEXT(ifmorespeceisreqirired, Irseeddidoneicopies ofNRCFarm3M4lI17)REACTORTRIPCIRCUITBREAKERSIMPLIFIED WIRINGDIAGRAIYI (TYPICAL)
NORMALLYCLOSEDINOTTESTEOIIIOEPENOENTLY)
NORMALLYOPENINOTTESTEOINOEPENOENTI.Y)
TESTPUSHBUTTONBKS12m)I?EMERGTRIPPUSHBUTTONMANUALTRIPPUSHBUTTON(RTGB)-REEDPSCLOSESONTESTUNDERVOLTAGEUVDCOILREEHEBRZS H?SPENTKBSHUNTTRIPCOILBKBQlZEBTC}}

Revision as of 15:47, 29 June 2018

LER 96-005-00:on 961206,determined That Independent Operability of Trip Coils Had Not Been Adequately Tested. Caused by Inadequate Surveillance Procedure.Performed Testing of Coils & Revised procedures.W/961220 Ltr
ML17229A173
Person / Time
Site: Saint Lucie NextEra Energy icon.png
Issue date: 12/20/1996
From: BENKEN E J, STALL J A
FLORIDA POWER & LIGHT CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
L-96-337, LER-96-005-02, LER-96-5-2, NUDOCS 9612260012
Download: ML17229A173 (9)
v • d • e


Text

~CATEGORY1REGULATORY INFORMATION DISTRIBUTION SYSTEM(RIDS)ACCESSXON NBR:9612260012 DOC.DATE:

96/12/20NOTARIZED:

NOFACIL:50-389 St.LuciePlant,Unit2,FloridaPower&LightCo.AUTH.NAMEAUTHORAFFILIATION BENKEN,E.J.

FloridaPower&LightCo.STALL,J.A, FloridaPower&LightCo.RECIP.NAME RECIPIENT AFFILIATION DOCKET05000389

SUBJECT:

LER96-005-00:on 961206,determined thatindependent operability oftripcoilshadnotbeenadequately tested.Causedbyinadequate surveillance procedure.

Performed testingofcoils&revisedprocedures.W/961220 ltr.DZSTRZBUTZON CODE:ZE22TCOFZESRECEZVED:LTR 2ENCL/SZZE:TXTXE:50.73/50.9 LicenseeEventReport(XER),IncidentRpt,etc.NOTES:RECIPIENT IDCODE/NAME PD2-3PDINTERNAL:

ACRSAEOD/SPD/RRAB NRR/DE/ECGB NRR/DE/EMEB NRR/DRCH/HICB NRR/DRCH/HQMB NRR/DSSA/SPLB RES/DET/EIB EXTERNAL:

LSTLOBBYWARDNOACMURPHY,G.A NRCPDRCOPIESLTTRENCL111122111111111111111111RECIPIENT IDCODE/NAME WIENS,L.BFILECENELBNRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DRPM/PECB NRR/DSSA/SRXB RGN2FXLE01LXTCOBRYCE,JHNOACPOORE,W.NUDOCSFULLTXTCOPIESLTTRENCL11221111111111111'111111DENOTETOALL"RIDS"RECIPIENTS:

PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMOWFNSD-5(EXT.

415-2083)

TOELIMINATE YOURNAMEFROMDISTRIBUTION LISTSFORDOCUMENTS YOUDON'TNEED!FULLTEXTCONVERSION REQUIREDTOTALNUMBEROFCOPIESREQUIRED:

LTTR26ENCL26 FloridaPower&LightCompany,P.O.Box128,FortPierce,FL34954.0128 December20,1996L-96-33710CFR50.73U.S.NuclearRegulatory Commission Attn:DocumentControlDeskWashington, D.C.20555Re:St.LucieUnit2DocketNo.50-389Reportable Event:96-005DateofEvent:December6,1996Operation Prohibited byTechnical Specifications

'breakers TheattachedLicenseeEventReportisbeingsubmitted pursuanttotherequirements of10CFR50.73toprovidenotification ofthesubjectevent.Verytrulyyours,J.A.StallVicePresident St.LuciePlantJAS/EJBAttachment cc;RegionalAdministrator, USNRCRegionIISeniorResidentInspector, USNRC,St.LuciePlant96i22600i2 96i220PDRADQCK050003898PDRanFPLGroupcompanyM(t NRCFORM388(4.96)U.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)(Seereverseforrequirednumberofdigits/characters foreachblock)APPROVEDSYOMSNO.3160<104sxFSIEs04isorseESTIMATED BURDENPERRESPONSEToCOMPLYWITHTHISMANDATOINFORMATION COLLECTION REQUESTI60.0HRS.REPORTEDLESSONLEARNEDAREINCORPORATED INTOTHEUCENSINOPROCESSANDFBACKTONOUSTRY.FORWARDCOMMENTSREGARDING BURDENESTIMATTOTHEINFORMATION ANORECORDSMANAGEMENT BRANCHmeF33IUWNUCLEARREGIAATORY COMMISSION.

WASHINGTON.

OC20666~1ANDTOTHEPAPERWORK REDUCTION PROJECT(31600104),

OFHCE0MANAGEMENT ANDBUDGET,WASHINGTON, OC20603.FACILITYNAMEIllSTLUCIEUNIT2DOCKETNISASBl(2105000389PAGEnl1OF7TITLE14lOperation Prohibited byTechnical Specifications duetoInadequate Surveillance TestingofReactorTripBreakers12OAY0696SEQUENTIAL REVISIONNUMBERNUMBER96-005-00MONTHDAY122096FACIUTYNAMEN/AFACIUlYNAM6N/ADOCKETNUMSERDOCKETNUMBEROPERATIN0 MODE(9)POWERLEVEL(10)<MC4':;<;:x"'.>

320.2201(b)20.2203(a)

(2)(i)20.2203(a){2){iii)20.2203(0)(2)(iv)20.2203(0){2)(v)20.2203(a)

(3)(ii)50.38(c)(1) 50.38(c)(2)50.73{a){2){i)60.73(a)(2)(ai) 50.73(a){2)(v)50.73(a)(2)(vii) 50.73(a)(2)

{viii)73.71OTHERSpecifyinAbstractbeloworInNRCForm3BBANAMEEdwinJ.Benken,Licensing EngineerTELEPHONE NUMBEROnc4aahraacoda)(561)467-7156cAUBESYSTEMCOMPONENT MANUFACTURER REPORTABLE ToNPRDSCAUSESYSTEMCOMPONENT REPORTABLE ToNPROSYEB{Ifyee,completeEXPECTEDSUBMISSION DATE).XNoEXPECTEDSUBMISSION DATE(16)MONTHOAYYEARABSTRACT(umitto1400spaces,i.eapproximately 15single.spacedtypewritten lines)(18)OnDecember6,1996,St.LucieUnit2wasoperating inMode1at100percentreactorpower.Whileperforming areviewasrequested byNRCGenericLetter96-01,"TestingofSafetyRelatedLogicCircuits,"

FPLdetermined thattheindependent operability oftripcoilsassociated withtheReactorProtective System(RPS)TripCircuitBreakers(TCB)hadnotbeenadequately testedbysurveillance procedure.

Theappropriate Technical Specification Actionrequirements wereimplemented forfailuretoperformasurveillance requirement.

Additional testingwasinitiated andsubsequently completed satisfactorily perTechnical Specification requirements.

Thecauseoftheeventwasaninadequate surveillance procedure fortestingtheoperation ofthereactortripcircuitbreakers.

Corrective actionsinclude:1)Operability testingofthetripcoilswasperformed toincludeadditional testingofelectrical contactsintheTCBcircuitpaths.2)Thesurveillance procedure governing thetestingoftheReactorProtective Systemlogicwaschangedtoincludetestingtherequiredcircuitry contacts.

3)Additional safetyrelatedelectrical circuitry iscontinuing tobereviewedwithregardtotestingadequacyinaccordance withtheactionsrequested inNRCGenericLetter96-01.

NRCFORM366AI4-9SILICENSEEEVENTREPORT(LER)TEXTCONTINUATION U.S.NUCLEARREGULATORY COMMISSIST.LUCIEUNIT205000389YEARSEQUENTIAL REVISION96-005-002OF7TEXTilfmorespeceisrequired, useedditionel copiesoffVRCf'orm366AiI17IOnDecember6,1996,withSt.LucieUnit2operating inMode1at100percentpower,FPLengineering personnel determined thattheindependent operability oftheundervoltage andshunttripelectrical logicpathsfortheReactorTripCircuitBreakers(TCBs)(EIIS:JC) maynothavebeenadequately testedbycurrentSt.LucieUnit2procedures.

Thisdetermination wasmadefollowing areviewofasimilarcondition foundatPaloVerdeStationandanassessment ofNRCGenericLetter,96-01,"TestingofSafetyRelatedLogicCircuits" forapplicability toSt.LuciePlant.St.LucieUnit2Technical Specification (TS)4.3.1.1,requiresthatafunctional testbeperformed atleastonceper18monthsorfollowing maintenance oradjustment ofthereactortripcircuitbreakerstoverifytheindependent operability oftheundervoltage andshunttrips.At1705onDecember6,1996,basedupontheabovedetermination, Operations invokedTechnical S,cification 4.0.3.forfailuretoperformasurveillance requirement withintheallowedsurveillance interval.

ACondition Report(CR)wasinitiated toassessthevalidityofthetestingrequirements andreviewtheoperability oftheTCBs.TS4.0.3specifies thatfailuretoperformasurveillance requirement withintheallowedsurveillance intervalshallconstitute noncompliance withtheoperability requirements foraLimitingCondition forOperation (LCO)~TS4.0.3allowsthatactionrequirements maybedelayedforupto24hourstopermitthecompletion ofasurveillance whentheallowable outagetimelimitsoftheLCOactionrequirements arelessthan24hours.Following discovery oftheabovecondition, functional testingwasinitiated at2145,onDecember6,1996,toverifytheindependent operability oftheundervoltage andshunttripsforthereactorTCBs.Thistestingwascompleted satisfactorily at2215onDecember6,1996,andTS4.0.3wasthenexited.Thecauseoftheeventwasaninadequate surveillance testprocedure.

Operating Procedure 2-1400059,"ReactorProtection System-PeriodicLogicMatrixTest,"containstheinstructions forperformance oftheoperability testfortheReactorTripCircuitBreakersshunttripandundervoltage tripdevices(coils).Thesurveillance testinstructions oftheprocedure verifiedthesatisfactory operation ofbothoftheaboveshuntandundervoltage tripdevices,andwereconsistent withvendorrecommendations, however,thetestdidnotverifytheindependent operation oftheelectrical contactswhichoperatetheshuntandundervoltage tripcoils.Atthetimeoftheevent,thesurveillance adequacyofthereactortripcircuitbreakershadbeenidentified foradditional engineering reviewinaccordance withtheschedulereferenced intheFPLresponsetoGenericLetter96-01,datedApril18,1996.Thiseventisreportable under10CFR50.73(a)(2)(i)(B) as"anyoperation orcondition prohibited bytheplant'sTechnical Specifications."

St.LucieUnit2TS4.3.1.1requiresthateachreactorprotective instrumentation channelbedemonstrated operablebytheperformance ofthechannelcheck,channelcalibration andchannelfunctional testoperations fortheModesandfrequencies shownintable4.3-".NRCFORM388AI49SI NRCFORM368AI4-96ILICENSEEEVENTREPORT(LER)TEXTCONTINUATION U.S.NUCLEARREGULATORY COMMISSIST.LUCIEUNIT205000389YEARSEQUENTIAL REVISION96-005-003OF7TEXT/ifmorespecsisrequired, useedditionel copiesofNRCcform366A/I17ITStable4.3.1requiresthatatleastonceper18monthsandfollowing maintenance andadjustment ofthereactortripbreakers, thechannelfunctional testshallincludeverification oftheindependent operability oftheundervoltage andshunttrips.Following a,determination thattheindependent operability oftheaboveundervoltage andshunttripdeviceshadnotbeenadequately testedatSt.LuciaUnit2,Operations personnel implemented thesurveillance requirements ofTS4.0.3.Aspreviously discussed, TS4.0.3specifies thatfailuretoperformasurveillance requirement withintheallowedsurveillance intervalconstitutes noncompliance withtheoperability requirements fo'ranLCOandpermitsactionrequirements tobedelayedforupto24hourstofacilitate completion ofthesurveillance.

FPLsatisfactorily performed theadditional, requiredtestingoftheelectrical logicpathsa<<ociated withthereactortripcircuitbreakerswithintheallowable timeconstraints ofTS4.0.3.Thereactortripcircuitbreakersareafunctional unitoftheReactorProtective System(RPS)instrumentation atSt.LuciePlant.Theoperability oftheRPSinstrumentation andbypassesensuresthat1)theassociated reactortripwillbeinitiated whenamonitored parameter reachesitssetpoint,2)thespecified coincidence logicismaintained, 3)sufficient redundancy ismaintained topermitachanneltobeoutofservicefortestingormaintenance, and4)sufficient systemfunctional capability isavailable fromdiverseparameters.

TheRPSisdesignedsothatanysinglefailurewithinthesystemwillnotpreventproperprotective actionatthesystemlevelwhenrequired.

TherearefourReactorTripChannelsassociated withtheRPS.Atwo-out-of-four RPSlogictripsignalresultsinthedeenergization offourtrippathrelays,whichinturnresultsinthedeenergization ofundervoltage coilsandenergization ofshunttripcoilsoneightreactorTCBs(RefertoFigure1).Eitherofthetwotripcoilsassociated withareactorTCBiscapableoftrippingthebreakerfromanRPSactuation.

BothofthetrippathsareactuatedbythesameRPSrelayandusedifferent setsofrelaycontactstoactuatetheirassociated tripcoils(RefertoFigure2).Oneor>>bothofthesecontactschangingstatewillresultintheopeningoftheTCB.Thefollowing testsareperformed atSt.Lucietoverifytheoperability ofthereactorTCBs:TheTripCoilofeachreactorTCBistestedbyuseofatestpush-button whichenergizes theshunttripcoilandopensthebreaker.Thistestisconducted atleastevery18monthsandfollowing maintenance oradjustment oftheTCB.2.TheUndervoltage (UV)CoilofeachreactorTCBistestedbyremovingthepowersupplyfusewhichdeenergizes theUVcoilandopensthebreaker.Thistestisalsoconducted every18monthsandfollowing maintenance oradjustment oftheTCB.3.TheRPSPeriodicLogicMatrixTestisperformed eachmonthtoverifythatRPStrippathrelaysfunctioncorrectly andtheTCBsopenwhenrequired.

NRCFORM368AI4-96I NRCFORM368AI4-9SILICENSEEEVENTREPORT(LER)TEXTCONTINUATION U.S.NUCLEARREGUlATORY COMINISSIO ST.LUCIEUNIT2YEARSEQUENTIAL REVISION0500038996-005-004OF7TEXT(Ifmorespecsisrequired, useedditionel copiesofNRC&rm368AJI17)Asdescribed bytheabovetests,theabilityofthereactortripbreakerstoopenonanRPSactuation signalisdemonstrated bytheRPSLogicMatrixTest,whichisperformed monthly.Additionally, theoperability oftheTCBtripcoilsandundervoltage coilsisdemonstrated atleastevery18months.Performance oftheabovetesting,however,doesnotspecifically verifythatthecontactsintheelectrical logicpathschangestatetoactuatetheundervoltage orshunttripcoils.Individual contactsthatperformasafetyfunctionarerequiredtobetestedinaccordance withtheguidanceprovidedbyGenericLetter96-01.Subsequent tothisevent,FPLEngineering performed areviewofthetestingrequirements associated withthereactorTCBs.Thisreviewdetermined thatwhilethepotential foranundetected failureofonecontactintheelectrical flowpathtoanRPSTCBexistsduringperformance oftheRPSLogicMatrixTest,thiswillnotresultinthefailureoftheTCBtotrip.Thedualpath,electrical arrangement associated witheachreactorTCBisnotdesignedasaredundant feature,asthereisnoseparation orisolation, andcommonequipment isusedinbothpaths.Thetwopathsarediverse,however,inthatdifferent mechanisms (energization vs.deenergization andtheuseofdifferent tripcoils)areprovidedfoincreased reliability ofthetripmechanism.

AreviewofTCBsurveillance testsperformed atSt.LucieUnit1determined thatatUnit1,theRPSLogicMatrixTestProcedure, performed monthly,includesaverification ofindicating lights(uniquetoUnit1)providedinboththeshuntandundervoltage trippaths.Theseindicating lightsarenotavailable atSt.LucieUnit2.Additionally, St.LucieUnit1Technical Specifications donotrequireafunctional checkbeperformed oftheindependent operability oftheshuntandundervoltage trippaths.Therefore, thiscondition isnotapplicable toSt.LucieUnit1.Additional surveillance testingperformed asaresultofthiseventsatisfactorily demonstrated thattheelectrical logiccontactsresponsible foractuating theundervoltage andshunttripcoilsonthereactorTCBswereoperational.

Noreactortrippathsweredisabledasaresultofthesubjecttestinginadequacy, andsufficient systemdiversity andfunctional capability wasmaintained.

Basedupontheabove,theprotection ofthe'health andsafetyofthepublicwasnotadversely affectedbytheevent.Testingoftheelectrical logiccontactsforthereactortripcircuitbreakerswassatisfactorily performed onDecember6,1996.2.TheSt.LucieUnit2ReactorProtection System-PeriodicLogicMatrixTestProcedure (2-1400059)wasrevisedtoincludeadditional verification ofTripRelayContactoperation duringthe18monthsurveillance performance.

NRCFORM388AI4.96I NRCFORM366A4.95ILICENSEEEVENTREPORT(LER)TEXTCONTINUATION U.S.NUCLEARREGULATORY COMMISSIO ST.LUCIEUNIT205000389YEARSEQUENTIAL REVISION96-005-005OF7TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm368AJI17I3.Inaccordance withGenericLetter96-01,FPLiscontinuing toreviewapplicable safetyrelatelogiccircuitry andtestingprocedures toensurethatallcircuitcomponents requiredtobetestedareadequately addressed bysurveillance procedures.

NoneNoneNRCFORM386AH-9S)

NRCFORM388A14-96)LICENSEEEVENTREPORT(LER)TEXTCONTINUATION U.S.NUCLEARREGULATORY COMMISSIST.LUCIEUNIT205000389YEARSEQUENTIAL REVISION96-005-006OF7TEXTfifmorespaceisreqvired, useadditional copiesoflIl'RCForm866AlI17IREACTORPROTECTIYE SYSTEMSIMPLIFIED LOGICDIAGRAMI238$7891091238$8789109I234$8789109I238$8789109INPUTSFROMIBSSMEAsUREMENT aIANNELSCHANNELATRIPUNITSCHANNEL8CHANNELCCHANNELDLCGIcA.BLOGICANLOGICA0LOGICMATRICESIA87ASlA8lIACIACIiAO2LOGICMATIYKRELAYS8-CLOGICB.DLOGICC.DLOGIC8818Ct8CI8CiKl1187I1871SD4CO>807807COIMA120VACINSTRUMENT BVSMB120YACINSTRUMENT BVSMC120VACINSTRUMENT BUSMD120VACINSTRUMENT BUSTRIPPA1113AB1AC1AD1BCI801C01AB2AC2AD2BC2BD2C024'ACA80VACBVS'IBVS2MAINCIRCVITBREAKERSMOTORGENERATORS

~240VACA83AC3A03BC3803C03A84AC4A04BC4BD4C04TRIPCIRCIATBREAKERCONTROLRELAYS12$YDCl(USB((KAIMANUALTT8PI4~IIMANUAL778P27IKI12$/USAKIUVSTSTTTYPaRCUITBREAKERSUY12$YDCI(USAKA12$YDCBVSB+STST~aamwangaITY9DENOTESADDITeNAL REACTORTRIPUNITONDIAT2CCWLOSSOFFLOW81DMDUALCEDMPOWERSUPPLIESCEDMCONTROLSYSTEMUeIYIDVAL CEDMPOWERSUPPUESGEOMPOWERSUPPUESPIRCOD111807.

CEDMCEDMCEDMCOILSCOILSGOESCEDMCEDMCEDMCONTROLELEMENTCaLSCalsGalsDRIVEMECHANISMS NRCFORM388A14.96)

NRCFORM388ALICENSEEEVENTREPORT(LER)TEXTCONTINUATION U.S.NUCLEARREGULATORY COMMISSIST.LUCIEUNIT205000389YEARSEQUENTIAL REVISION96-005-00'7OF7TEXT(ifmorespeceisreqirired, Irseeddidoneicopies ofNRCFarm3M4lI17)REACTORTRIPCIRCUITBREAKERSIMPLIFIED WIRINGDIAGRAIYI (TYPICAL)

NORMALLYCLOSEDINOTTESTEOIIIOEPENOENTLY)

NORMALLYOPENINOTTESTEOINOEPENOENTI.Y)

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