ML17228A133

Special Rept:On 930310,longitudinal Channel of Common Seismic Monitor Recorder & Indicator Declared Out of Svc & Remained Out of Svc Longer than Allowed by Ts.Util Awaiting Repairs to Instruments by Vendor

ML17228A133
Person / Time
Site:	Saint Lucie
Issue date:	04/19/1993
From:	SAGER D A FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
L-93-102, NUDOCS 9304270028
Download: ML17228A133 (3)

Text

Accm~g@PP~@g~@Xy&XWKÃsŽACCESSIONNBR:9304270028DOC.DATE:93/04/19NOTARIZED:NOFACIL:50-335St.LuciePlant,Unit1,FloridaPower&LightCo.50-389St.LuciePlant,Unit2,FloridaPower&LightCo.AUTH.NAMEAUTHORAFFILIATIONSAGER,D.A.FloridaPower&LightCo.RECIP.NAMERECIPIENTAFFILIATIONDocumentControlBranch(DocumentControlDesk)DOCKETI0500033505000389

SUBJECT:

Specialrept:on930310,longitudinalchannelofcommon.,seismicmonitorrecorder&indicatordeclaredoutofsvc&remainedoutofsvclongerthanallowedbyTS.Utilawaiting'epairstoinstrumentsbyvendor.DISTRIBUTIONCODE:IE22DCOPIESRECEIVED:LTRLENCLISIZE:+-TITLE:50,73/50.9LicenseeEvent-Report(LER),IncidentRpt,etc.NOTES:'DRECIPIENTIDCODE/NAMEPD2-2LANORRISPJINTERNAL:ACNWAEOD/DOAAEOD/ROAB/DSPNRR/DE/EMEBNRR/DRCH/HHFBNRR/DRCH/HOLBNRR/DRSS/PRPBNRR/DSSA/SRXBRES/DSIR/EIBEXTERNALEG&GBRYCEgJHNRCPDRNSICPOORE,W.COPIESLTTRENCL1111221122111111221.111221111RECIPIENTIDCODE/NAMEPD2-2PDACRSAEOD/DSP/TPABNRR/DE/EELBNRR/DORS/OEABNRR/DRCH/HICBNRR/DRIL/RPEBNRR/3)5SA/SPLBEGPQL502GN2FILE01LSTLOBBYWARDNSICMURPHYPG.ANUDOCSFULLTXTCOPIESLTTRENCL11221111111111111111111.111DDD,'NOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.504-2065)TOELIMINATEYOURNAMEFROMDISTRII3UTIONLISTSFORDOCUMENTSYOUDON'TNEED!TOTALNUMBEROFCOPIESREQUIRED:LTTR32ENCL32D P.O.Box,Ft.Pierce,Fi34954-0128FPLApril19,1993.L-93-10210CFR50.36U.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555Re:St.LucieUnits1and2DocketNos.50-335and50-389SpecialReportDateofEvent:March10,1993SeismicMonitorinChannelOutofServiceTheattachedSpecialReportisbeingsubmittedpursuanttotherequirementsofSt.LucieTechnicalSpecification3.3.3.3.ThisreportprovidesnotificationthataSeismicMonitoringChannelhasbeenoutofserviceforgreaterthanthirtydaysanddescribesthecauseofthemalfunctionandtheplansforrestoringthechanneltoservice.Verytrulyyours,D.A.SerVicePsidentSt.LuePlantDAS/JWH/kwAttachmentcc:StewartD.Ebneter,RegionalAdministrator,USNRCRegionIISeniorResidentInspector,USNRC,St.LuciePlantDAS/PSLN900-93~gr~'rr304270028930~~9~'G~PDRADOCK05000335SPDRanFpi.GroupcornpanV NRCSPECIALREPORTSEISMIC,MONITOROUTOFSERVICEFORLONGERTHANALLOWEDBYTECHNICALSPECIFICATIONSOnMarch10,1993thelongitudinalchanneloftheSt.LuciePlantcommonseismicmonitorrecorder(SMR-42-1)and'seismicmonitorindicator(SMI-42-11)weredeclaredoutofservice.AsrequiredbyTechnicalSpecification3.3.3.3,thisSpecial'ReportisbeingsubmittedtonotifytheNRCthattheseinstrumentshavebeenoutofservicegreaterthan30days.There'are2seismicmonitorrecorders(SMRs)locatedinUnit1containmentareawhicharetiedtoamasterSMR-42-1thatalsofunctionsasan'additionalcontainmentseismicrecorder.ThemasterSMR-42-1providesaoutputsignalonthedifferent'motionranges(transverse,longitudinal,andvertical)fromthesethreetriaxialacceleratorstotheseismicmonitoringindicator(SMI)SMI-42-11locatedintheUnit1controlroom.TheSMIservestoprovidepeakaccelerationdatatocontrolroomoperatorsso,thattheymaydetermine'ifaOperationalBasisEarthquake(OBE)hasoccurred.Onamonthlychannelcheck,theSMIistestedbyinsertingatestsignaltoeachofthemotionchannelsonthemastercontrollertoexcitetherespectiverecorder.DuringasurveillanceoftheSMIthetestsignalwasinsertedbuttheindicatorforthelongitudinalchannelshowednodeflection.Troubleshootingofthesystemindicatedthattheproblemwasinthe,mastercontrollerSMR-42-1.OnMarch18,SMR-42-1wassenttothevendor(Kinemetrics)forrepair.ThismodelofseismicmonitorisnolongermanufacturedsorepairswereexpeditedontheexistingSMR-42-1.TheunitarrivedbackatSt.LucieonApril7.InstrumentandControls(l&C)departmentmadeacontainmententryandinstalledSMI-42-1onthesameday.Whentheunitwastestedtoverifyoperabilityitwasdiscoveredthatthesamesymptomsoftheproblemwerestillpresent.Thel8CdepartmenttriedtodeterminethecauseandmakerepairstotheinstrumentatSt.LuciePlant.However,onApril10,theSMR-42-1wasreturnedtothevendorforfurtherrepair.CurrentlySt.LuciePlantisawaitingrepairoftheinstrumentbyKinemetricstodeterminetheexactrootcauseandtoplacetheunitbackinservice.ThetriaxialacceleratorSMR-42-1,andcontrolroomindicatorSMI-42-11,areexpectedtobeplacedbackinservicebyMay10,1993.Intheinterim,sufficientcapabilityisstillavailabletopromptlydeterminethemagnitudeofaseismiceventandevaluatetheresponseofthosefeaturesimportanttosafety.TheplantseismicswitchSMS-42-12,andpeakshockrecordersSMR-42-9andSMR-.42-10,areindependentfromtheaffectedequipmentdescribedinthisspecialreport.SMS-42-12willcontinuetoprovideannunciationinbothcontrolroomsifaseismiceventequaltoorgreaterthan90%oftheOBEoccurs.AfteranOBEalarm,plantpersonnelwillhavetheabilitytoreviewpeakshockrecorderreadingsonSMR-42-9andSMR-42-10.Additionally,seismicrecordersSMR-42-2.throughSMR-42-5willrecordinformationfromaOBEorDesignBasisEventonmagnetictapeforlaterreviewandanalysis.