ML17227A467

LER 92-004-00:on 920521,relay Time Delay Settings Altered Due to Personnel Error.Remaining Load Sequence Timers on Both Units 1 & 2 Were Inspected to Ensure Thumbwheel Switches Were Set correctly.W/920618 Ltr

ML17227A467
Person / Time
Site:	Saint Lucie
Issue date:	06/18/1992
From:	SAGER D A, WACHTEL P K FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
L-92-167, LER-92-004-02, LER-92-4-2, NUDOCS 9206250161
Download: ML17227A467 (7)

Text

DOCKET05000335ACCELERATED'STIUBUTIONDEMONSATIONSYSTEMREGULATYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)jagACCESSIONNBR:9206250161DOC.DATE:92/06/18NOTARIZED:NOFACIL:50-335St.LuciePlant,Unit1,FloridaPower&LightCo.AUTH.NAMEAUTHORAFFILIAT10NWACHT'EL,P.K.FloridaPower&LightCo.SAGER,D.A.FloridaPower&LightCo.RECIP.NAMERECIPIENTAFFILIATION

SUBJECT:

LER92-004-00:on920521,relaytimedelaysettingsalteredduetopersonnelerror.RemainingloadsequencetimersonbothUnit1&Unit2wereinspectedtoensurethumbwheelswitchesweresetcorrectly.W/920618ltr.DISTRIBUTIONCODE:IE22TCOPIESRECEIVED:LTRrENCLgSIZE:TITLE:50.73/50.9LicenseeEventReport(LER),IncidentRpt,etc.NOTES:RECIPIENTIDCODE/NAMEPD2-2LANORRIS,J1NTERNAL:ACNWAEOD/DOAAEOD/ROAB/DSPNRR/DLPQ/LHFB10NRR/DOEA/OEABNRR/DST/SELB8DNRRfDSSPLB8D1REGFILE02RLE01EXTERNAL:EG&GBRYCEiJ.HNRCPDRNSICPOORETW.COPIESLTTRENCL1111221122111111111111331111RECIPIENTIDCODE/NAMEPD2-2PDACRSAEOD/DSP/TPABNRR/DET/EMEB7ENRR/DLPQ/LPEB10NRR/DREP/PRPB11NRR/DST/SICB8H3NRR/DST/SRXB8ERES/DSIR/EIBLSTLOBBYWARDNSICMURPHY,G.ANUDOCSFULLTXTCOPIESLTTRENCL11221111112211111111111NOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE!CONTACI'HEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.20079)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLINISFORDOCUMENTSYOUDON'TNEED!FULLTEXTCONVERSIONREQUIREDTOTALNUMBEROFCOPIESREQUIRED:LTTR32ENCL32 P.O.Box128,Ft.Pierce,FL34954-0128June18,1992L-92-16710CFR50.73U.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskwashington,D.C.20555Re:St.LucieUnit1DocketNo.50-335ReportableEvent:92-004DateofEvent:May21,1992RelayTimeDelaySettingsAlteredduetoPersonnelErrorcausesConditionProhibitedbTechnicalSecificationsTheattachedLicenseeEventReportisbeingsubmittedpursuanttotherequirementsof10CFR50.73toprovidenotificationofthesubjectevent.Verytrulyyours,D.A.gerVicersidentSt.LuePlantDAS/JWH/kwAttachmentcc:StewartD.Ebneter,RegionalAdministrator,USNRCRegionIISeniorResidentInspector,USNRC,St.LuciePlantDAS/PSLN715-929206250161920618PDRADOCK050003358PDRanFPLGroupcompany FPLFcccirrTlcdIFICForm380US.NUCLEARREGNATORYCOMMISSIONLICENSEEEVENTREPORT(LER)ATTIXXCOCACIICX0IICCI0100CCCC00000CCICIATTOOACCCIOIImCCXCCTO00XCTTTCOI~0CTXCIATXCIIXXITCT0XIICXACCT:000ICTATOCCAIXICCICCXICICCAICCXIIAACXIIICICIAIClolloICCIXTXIAICIICTCCICINAIXTCNfITMCIXI+44QLIIXIAAXCACICOAAT0XITCASSAVAWIS44lRW,OC00MCrCDloTHC00tIICCX00ICOUCTXXIICOCCT0IICCICC.CIIICIOIIWNODCICIIXIIMXXTAOCXCIXAOC00001FACILITYNAME(1)St.LucieUnit1DOCKETNUMBER(2)PAGE305000335104~(4)RelayTimeDelaySettingsAlteredduetoPersonnelErrorCausesConditionProhibitedbyPlantTechnicalSpecificationsEVENTDATE(5)LERNUMBER(6)REPORTDATEmOTHERFACILITIESINVOLVED(8)05DAY21YEAR92SALR920040006DAYYEAR1892FACILITYNAMESN/AN/ADOCKETNUMBER(S)05000OPERATINGMODE(9)20.402(b)20.405(c)50.73(a)(2)(iv)THISREPORTISSUBMITIEDPURSUANTTOTHEREQUIREMENTSOF10CFR:Checkoneormoreofthefollowin(11)73.71(b)POWERLEVEL(10)10020.405(a)(1)(i)20.405(a)(1)(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)50.73(a)(2)(iii)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(SpecifyinAbstractbelowandinTextNRCForm388A)LICENSEECONTACTFORTHISLER12PatriciaK.Wachtel,ShiftTechnicalAdvisorTELEPONENUMBERAREACODE407465-3550COMPLETEONELINEFOREACHCOMPONENTFAILUREDESCRIBEDINTHISREPORT13SYSTEMCOMPONENTMANUFAC-REPORTABLETURERTONPRDSCAUSESYSTEMCOMPONENTMANUFAC-TURERREPORTABLETONPRDSSUPPLEMENTALREPORTEXPECTED14YES(Ifyes,completeEXPECTEDSUBMISSIONDATE)NOEXPECTEDMONTHDAYYEARSUBMISSIONDATE(15)ABSTRACT(Limitto1400spaces.I.e.approximatelyfifteensingle-spacetypewrittenlines)(16)OnMay21,1992,St.LucieUnit1wasinmode1,operatingat100%steadystatepower.AutilityengineerwasinspectingthetimedelaysettingsonAgastatrelaysInspecifhelectricalbuseswhenitwasdiscoveredthatthetimerthumbwheelsettingsforthe1AComponentCoolingWaterpumpandthe18ContainmentSpraypumpwereverydosetothe+I-onesecondTechnicalSpecificathnsurveillancetolerancefordieselgeneratorloadsequencing.Subsequentinvestigationrevealedthatthetimedelaysettingshadbeenaltered.Thecauseofthiseventwaspersonnel,error.Whilecleaningthecubidesinwhhhtheserelayswerelocated,acontractmaintenanceworkerinadvertentlychangedthetimesettingsonthethumbwheelswitcheswhilecleaningthefacesoftherelays.Correctiveactionstakeninclude:1)theAgastatrelayswereresettocomplywithTechnicalSpecifications,2)themaintenancecrewswerecounseledonhowtocleantherelaysandnotdisturbthehadsequencetimersettings,3)theswitchgearcleaningprocedurewaschangedtoensurethecorrectthumbwheelswitchsettingisverifiedpriortoreturningtheelectricalbustoservice,and4)theremaininghadsequencetimersonbothUnit1andUnit2wereinspectedtoensurethethumbwheelswitchesweresetcorrectly.FPLFacsimileofNRCForm366(M9)

FPLFffcaffffleDiACFOffff$$IMolUa.NUCLEARREGULATORYCOMMfssfONUCENSEEEVENTREPORT(LER)TEXTCONTINUATIONITTCTTTDCCCIICLTINCIfl~AIICCTTCTCIATKDTAICIINICIIICWCtfNTOCCACCTTCTIITICICCCICIATIIWCCIICCTII7IICCIXCT:TOCIITATCITWNCTCTACCNTCICCNICNCTA/ITINCCTCIAIClOllCICCNCCNCIICTCSNCNINAINICNTCDANCE~IACMX1CARICOAAICITTCNIICIIAWANDCITCN,DCTIINCAKIlOTINtNTTIATÃTICTACT11IIICICCTffIICCICCCITICCCfIWWCINNTNCTIACIICTWAIADKflDADCTCICAFACILITYNAME(1)St.LucieUnit1DOCKETNUMBER(2)LERNUMBER(6)EQUENTIALREVISIONUMBERNUMBERPAGE(3)0500033592TEXT(limorespaceisrequired,useadditionalNRCForm366A's)(17)004000204OnMay21,1992,St.LucieUnit1wasinmode1at100%steadystatepower.Autilityengineerwasinspectingthe1A3and1B3electricalbuses(EIIS:EB)tocheckthetimedelaysettingsonspecificAgastatrelays.Thisinspectionwasbeingperformedinresponsetoanengineeringassessmentrelatingtorecentindustryeventsonloadsequencetimers.TheinvestigationatSt.LucieUnit1revealedthatthetimedelaysettingsforthe1AComponentCoolingWaterpump(EIIS:CG)(CGW)andthe1BContainmentSpraypump(EIIS:BE)(CS)wereIncorrect.Thefollowingdatawasprovkledfollowingtheinspection:1ACCW1BCSREQUIREDTIMEAS-FOUND(4-1second)Tl-IUMBWHEELSETIING6.007.0112.001298AS-FOUNDTlME(05-2142)7.1713.11A%AFTTIME6.12secords12.16secondsThisindicatedthatboththe1ACGWand1BCSpumpshadtheirtimedelaysettingsoutskfeofthe+/-onesecondloadsequencingsettingrequiredbyTechnicalSpecificationsutveillancerequirement4.8.1.1.2.e.11.ThetimeswerelastverifiedduringtheUnit1PeriodicIntegratedTestoftheEngineeredSafetyFeaturesperformedinOctober,1991.Thefollowingtimesettingsweredocumentedforthesepumps:1ACGWpump-6.18seconds;1BCSpump-12.16seconds.EachofthesetimeswaswithintheacceptabletoleranceallowedbyplantTechnicalSpecifications.Thecauseofthiseventhasbeenattributedtopersonnelerror.Theinadvertentchangingofthetimerthumbwheelswitchesappearstohaveoccurredwhenthecubfciesonthe4160voltbusescontainingtheserelayswerecleanedduringthelastUnit1refuelingoutage.Whenthebusseswerecleaned,theworkercouldcomeincontactwiththethumbwheeiandinadvertentlyalterthetimedelaysettings.Therewerenounusualworkconditionswhichmayhavecontributedtothiseventnorwasthereanyspecificproceduralgukfancetocautionthecontractmaintenancepersonnelnottodisturbtheloadsequencetimersettingswhencleaningtherelays.Thiseventisreportableundertherequirementsof10CFR50.73.a.2.i.Bas"anyoperationorconditionprohibitedbytheplantTechnicalSpecTiications."TechnicalSpecificationsurveillancerequirement4.8.1.1.2.e.5requiresthatoncepereighteenmonths,alossofoff-sitepowerinconjunctionwithanengineeredsafetyfeatureactuationtestsignaI(EIIS:JE)besimulated.Followingthestartoftheemergencydieselgenerator(EDG)(EIIS:EK),theemergencybusseswithpermanentlyconnectedloadsenergizationandtheauto~nnectedemetgency(accident)loadsenergizationthroughtheauto-sequencermustbeverified.VerificationthattheautomaticloadFPLFacsimiieofNRCForm366(649)

AILFarmlrrffoofIRCFcrrrr368gHffrjU.S.NUCLEARREGULATORYCOMMfSSIoffLICENSEEEVENTREPORT(LER)TEXTCONTTNUATTONAARTORoOWIRILTIRCITlcTTORRACAOTTCTTAATTOILROTRITITICIATTCRTdOCARLTTATllTIRIOCCICIATCRCCLITOTICTRIARCH:RANTLICRWARTCOWRRTCIRONCRAIIMTRRICRRATCldIIRICOCICRRDICICRTCRANI/RIRRTCRAROIrRRRLIIRILCLTARICCRAATCRTOISRRRTLWRRATR7I.OCRRRLHoIoTIRPARRRCIRlCITUCTCRIROCCTTTIIOCIRLCTRCCEÃAMRARTRRTRORAXRT,WARRRROROCTOOLFACILITYNAME(1)St.LucieUnit1DOCKETNUMBER(2)LERNUMBER(6)EQUENTIALNUMBERREVISIONUMBERPAGE(3)05000335TEXT(Ifmorespaceisrequired,useadditionalNRCForm366A's)(17)92004000304sequencetimersareoperablewiththeintervalbetweeneachloadbkckwithin+/-onesecondofitsdesignintervalisrequiredasperTechnicalSpecificationsurveillancerequirement4.8.1.1.2.e.11.AlthoughthissurveillancewasperformedsatisfactorilysevenmonthsagoduringtheUnit1refuelingoutage,theas-foundsettingsforthe1AComponentCoolingWaterandthe1BContainmentSpraypumpsindicatethattheywouldnothaveloadedontotheEDGinthepropersequence.Adetailedengineeringevaluation(JPN-PSL-SEEP-92-031)wasperfomedtodemonstratethattheEDGwouldhaveperformedacceptablywiththeas-'foundtimersettings.ConclusionsfromthisevaluationindicatedthatthetimersettingsdidnotadverselyaffecttheabilityoftheEmergencyDieselGeneratorstosupplypowertotherequiredEngineeredSafetyFeatureloadsunderdesignbasislossofoff-sitepowerandaccidentconditions.Thehealthandsafetyofthepublicwasnotatriskatanytimewhileinthiscondition.1.Therequiredtimedelaysettingswererestoredforthetwoalteredloadsequencetime+.2.TheremainingloadsequencetimersonbothUnit1andUnit2wereinspectedtoensurethethumbwheelswitchesweresetcorrectly.Allwereunchanged.3.ElectricalmaintenancewillvisuallyverifythatallloadsequencetimersaresetcorrectlypriortoenteringMode4subsequenttoarefuelingoutage.Thisverificationwillbeincorporatedintoplantprocedures.4.TheswitchgearcleaningprocedurewaschangedtoincludestepstoverifythetimerthumbwheelswitchsettingiswithinTechnicalSpecificationslimitsbeforereleasingthebusforsoNice.5.Electricalmaintenancesupervisorscounseledcontractorandutilitymaintenancepersonnelnottodisturbtheloadsequencetimerswhilecleaningtheswitchgearcubicles.6.ThePlantMaintenanceDepartmentsevaluatedotherpreventativemaintenancecleaningproceduresforthepotentialtodisturbthesettingsofloadsequencetimers.FPLFacsimileofNRCForm366(649)

FPLFscttmleatPICFomlSOBIMQjU.S.NUCLEARREGULATORYCOMMSSTONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONI¹IWOIOOt¹eIOITIWOIOICOTWATI¹J¹IC¹OCIII¹OKN¹TOOOWLTTOTIIll¹IOOCCCCAlla¹Ot1ICOODII¹cl¹oo¹I>II¹cTawwtccloC¹o¹¹l1I¹olc¹two¹JsolIoo¹AI¹lollcI¹cccooHCII¹¹C¹T1¹AHAI¹I¹IITOIIA¹CHt¹CCOLII¹IA¹CCA¹l¹C¹CATI¹IICOO+O¹t¹CAAOIOICW.OOTIOOAIIDTOTIOTJIUC¹WOIWICCCCICHIIOC¹OTCIIWAIL%OIIICOI¹¹AKIÃA¹¹TNO¹AX¹T.WA¹¹et¹t¹COO$0¹CLFACILUYNAME(1)St.LucieUnit1DOCKETNUMBER(2)LERNUMBER(6)EQUENTIALREVISIONUMBER.NUMBERPAGE(3)0500033592TEXT(Ifmorespaceisrequired,useadditionalNRCForm366A's)(17)004000404Therewasnocomponentfailureduringthisevent;however,specificcomponentidentificationisincludedforinformationalpurposes.Relay:PartNumber.Manufacturer:Agastat7tmingRelayDSBXXOI25SPAXAAAmeraceCorporationTherehavebeennopreviouseventsinwhichmaintenancepersonnelhaveinadvertentlyalteredrelaytimedelaysettings.FPLFacsimileofNRCForm366(649)