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&XWKÃsŽ ACCESSION NBR:9304270028 DOC.DATE:

93/04/19NOTARIZED:

NOFACIL:50-335 St.LuciePlant,Unit1,FloridaPower&LightCo.50-389St.LuciePlant,Unit2,FloridaPower&LightCo.AUTH.NAMEAUTHORAFFILIATION SAGER,D.A.

FloridaPower&LightCo.RECIP.NAME RECIPIENT AFFILIATION DocumentControlBranch(Document ControlDesk)DOCKETI0500033505000389

SUBJECT:

Specialrept:on930310,longitudinal channelofcommon.,seismicmonitorrecorder&indicator declaredoutofsvc&remainedoutofsvclongerthanallowedbyTS.Utilawaiting'epairs toinstruments byvendor.DISTRIBUTION CODE:IE22DCOPIESRECEIVED:LTR LENCLISIZE:+-TITLE:50,73/50.9 LicenseeEvent-Report(LER),IncidentRpt,etc.NOTES:'DRECIPIENT IDCODE/NAME PD2-2LANORRISPJINTERNAL:

ACNWAEOD/DOAAEOD/ROAB/DSP NRR/DE/EMEB NRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DRSS/PRPB NRR/DSSA/SRXB RES/DSIR/EIB EXTERNALEG&GBRYCEgJHNRCPDRNSICPOORE,W.COPIESLTTRENCL1111221122111111221.111221111RECIPIENT IDCODE/NAME PD2-2PDACRSAEOD/DSP/TPAB NRR/DE/EELB NRR/DORS/OEAB NRR/DRCH/HICB NRR/DRIL/RPEB NRR/3)5SA/SPLB EGPQL502GN2FILE01LSTLOBBYWARDNSICMURPHYPG.A NUDOCSFULLTXTCOPIESLTTRENCL11221111111111111111111.111DDD,'NOTETOALL"RIDS"RECIPIENTS:

PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.504-2065)

TOELIMINATE YOURNAMEFROMDISTRII3UTION LISTSFORDOCUMENTS YOUDON'TNEED!TOTALNUMBEROFCOPIESREQUIRED:

LTTR32ENCL32D P.O.Box,Ft.Pierce,Fi34954-0128 FPLApril19,1993.L-93-10210CFR50.36U.S.NuclearRegulatory Commission Attn:DocumentControlDeskWashington, D.C.20555Re:St.LucieUnits1and2DocketNos.50-335and50-389SpecialReportDateofEvent:March10,1993SeismicMonitorin ChannelOutofServiceTheattachedSpecialReportisbeingsubmitted pursuanttotherequirements ofSt.LucieTechnical Specification 3.3.3.3.Thisreportprovidesnotification thataSeismicMonitoring Channelhasbeenoutofserviceforgreaterthanthirtydaysanddescribes thecauseofthemalfunction andtheplansforrestoring thechanneltoservice.Verytrulyyours,D.A.SerVicePsidentSt.LuePlantDAS/JWH/kw Attachment cc:StewartD.Ebneter,RegionalAdministrator, USNRCRegionIISeniorResidentInspector, USNRC,St.LuciePlantDAS/PSLN900-93~gr~'rr304270028 930~~9~'G~PDRADOCK05000335SPDRanFpi.GroupcornpanV NRCSPECIALREPORTSEISMIC,MONITOROUTOFSERVICEFORLONGERTHANALLOWEDBYTECHNICAL SPECIFICATIONS OnMarch10,1993thelongitudinal channeloftheSt.LuciePlantcommonseismicmonitorrecorder(SMR-42-1) and'seismicmonitorindicator (SMI-42-11) weredeclaredoutofservice.AsrequiredbyTechnical Specification 3.3.3.3,thisSpecial'Reportisbeingsubmitted tonotifytheNRCthattheseinstruments havebeenoutofservicegreaterthan30days.There'are 2seismicmonitorrecorders (SMRs)locatedinUnit1containment areawhicharetiedtoamasterSMR-42-1thatalsofunctions asan'additional containment seismicrecorder.

ThemasterSMR-42-1providesaoutputsignalonthedifferent

'motionranges(transverse, longitudinal, andvertical) fromthesethreetriaxialaccelerators totheseismicmonitoring indicator (SMI)SMI-42-11 locatedintheUnit1controlroom.TheSMIservestoprovidepeakacceleration datatocontrolroomoperators so,thattheymaydetermine'if aOperational BasisEarthquake (OBE)hasoccurred.

Onamonthlychannelcheck,theSMIistestedbyinserting atestsignaltoeachofthemotionchannelsonthemastercontroller toexcitetherespective recorder.

Duringasurveillance oftheSMIthetestsignalwasinsertedbuttheindicator forthelongitudinal channelshowednodeflection.

Troubleshooting ofthesystemindicated thattheproblemwasinthe,mastercontroller SMR-42-1.

OnMarch18,SMR-42-1wassenttothevendor(Kinemetrics) forrepair.Thismodelofseismicmonitorisnolongermanufactured sorepairswereexpedited ontheexistingSMR-42-1.

TheunitarrivedbackatSt.LucieonApril7.Instrument andControls(l&C)department madeacontainment entryandinstalled SMI-42-1onthesameday.Whentheunitwastestedtoverifyoperability itwasdiscovered thatthesamesymptomsoftheproblemwerestillpresent.Thel8Cdepartment triedtodetermine thecauseandmakerepairstotheinstrument atSt.LuciePlant.However,onApril10,theSMR-42-1wasreturnedtothevendorforfurtherrepair.Currently St.LuciePlantisawaitingrepairoftheinstrument byKinemetrics todetermine theexactrootcauseandtoplacetheunitbackinservice.Thetriaxialaccelerator SMR-42-1, andcontrolroomindicator SMI-42-11, areexpectedtobeplacedbackinservicebyMay10,1993.Intheinterim,sufficient capability isstillavailable topromptlydetermine themagnitude ofaseismiceventandevaluatetheresponseofthosefeaturesimportant tosafety.TheplantseismicswitchSMS-42-12, andpeakshockrecorders SMR-42-9andSMR-.42-10, areindependent fromtheaffectedequipment described inthisspecialreport.SMS-42-12 willcontinuetoprovideannunciation inbothcontrolroomsifaseismiceventequaltoorgreaterthan90%oftheOBEoccurs.AfteranOBEalarm,plantpersonnel willhavetheabilitytoreviewpeakshockrecorderreadingsonSMR-42-9andSMR-42-10.

Additionally, seismicrecorders SMR-42-2.through SMR-42-5willrecordinformation fromaOBEorDesignBasisEventonmagnetictapeforlaterreviewandanalysis.