ML17223A288

LER 89-004-00:on 890715,discovered That Reactor Containment Fan Coolers Had Filter Media in Place During Power Operations.Caused by Inadequate Maint Instructions.Filters Removed & Maint Instructions revised.W/890814 Ltr

ML17223A288
Person / Time
Site:	Saint Lucie
Issue date:	08/14/1989
From:	SNYDER M J, WOODY C O FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
L-89-299, LER-89-004-03, LER-89-4-3, NUDOCS 8908220121
Download: ML17223A288 (7)

Text

gcczlERATEDDISI+3UTIONDEMONSTRA'gNSYSTEMREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:8908220121DOC.DATE:89/08/14NOTARIZED:NOFACIL:50-335St.LuciePlant,Unit1,FloridaPower&LightCo.AUTH.NAMEAUTHORAFFILIATIONSNYDER,M.J.FloridaPower&LightCo.WOODY,C.O.FloridaPower&LightCo.RECIP.NAMERECIPIENTAFFILIATIONDOCKET05000335R

SUBJECT:

LER89-004-00:on890715,containmentfancoolerfiltersleftinplaceduringunitpoweroperationduetoIP.W/8ltr.DISTRIBUTIONCODE:IE22TCOPIESRECEIVED:LTRENCL/SIZE:TITLE:50.73/50.9LicenseeEventReport(LER),ncidentRpt,etc.NOTES:RECIPIENTIDCODE/NAMEPD2-2LANORRIS,JINTERNAL:ACRSMICHELSONACRSWYLIEAEOD/DSP/TPABDEDRONRR/DEST/CEB8HNRR/DEST/ICSB7NRR/DEST/MTB9HNRR/DEST/RSB8ENRR/DLPQ/HFB10NRR/DOEA/EAB11NUDOCS-ABSTRACTRES/DSIR/EIBEXTERNALEG&GWILLIAMSESLSTLOBBYWARDNRCPDRNSICMURPHY,G.ACOPIESLTTRENCL111111111111111111111111111144111111RECIPIENTIDCODE/NAMEPD2-2PDACRSMOELLERAEOD/DOAAEOD/ROAB/DSPIRM/DCTS/DABNRR/DEST/ESB8DNRR/DEST/MEB9HNRR/DEST/PSB8DNRR/DEST/SGB8DNRR/DLPQ/PEB10PB10REGFILE02GN2ILE01FORDBLDGHOY,ALPDRNSICMAYS,GCOPIESLTTRENCL1122112211111111111.1221111111111hRID/hFULLTEXTCONVERSIONREQUIREDTOTALNUMBEROFCOPIESREQUIRED:LTTR40ENCL40 P.O.Box14000,JunoBeach,FL33408-0420@PLAUGUSTj14198gL-89'-299U.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555Gentlemen:Re:St.LucieUnit1DocketNo.50-335ReportableEvent:89-04DateofEvent:July15,1989ContainmentFanCoolerFiltersLeftinPlaceDuringUnitPover0erationDuetoInadeateProceduresTheattachedvoluntaryLicenseeEventReportisbeingsubmittedtoprovidenotificationofthesubjectevent.Verytrulyyours,C.0.WoodyActingSeniorVicePresident-NuclearCOW/JRH/cm'ttachmentscc:StewartD.Ebneter,RegionalAdministrator,RegionII,USNRCSeniorResidentInspector,USNRC,St.LuciePlantan'f'r.Groupcompany NAC)erin$44195$1LICENSEEEVENTREPORTILER)U.S.NUCLEAAREGULATORYCOMMISSIONAPPAOVEOOMBNO2'1100104EXPIRES4-$1BSFACILITYNAME111DOCKETNUMBERIllPASt.Lucie,UnitOne0500033510FOCONTAINMENTFANCOOLERFILTERSLEFTINPLACEDURINGUNITPOVEROPERATIONDUETOINADEQUATEPROCEDURESEVENTDATEISILERNUMBER(41REPORTDATE171OTHERFACILITIE5INVOLVEDISIMONTHOAYYEARYEAR140Ij44TIAL4VM44IMOIIITHNIMofreOAYYEARiACII.ITYVAMESN/AOOCKFTNVMBERISI05000071589840008148N/A05000OPERATINOMODE(~)5POWERLEYEL000~i20.402(oi20405(~)Ill(il20.40541(I)iii120.405(~IllI(iiil20.405(~l(l)(ivl20,405(~1111(vI20.405(cl50.$4(cl(ll50.$4(el(2)50.7$(eI(2)Ii)50.7$(~l(ll(iilS0.7l(el(2)(iiilLICENSEECONTACTFORTHISLER(12)50.7l(~I(2l(ivi50.72(~)(21(vI50,77(4)(21(riiI507$N)(ll(niil(AI50.7$(~l(21(riillIBIS0.7l(~I(2)(e)THISREPORTISSUBMITTEDPURSUANTT0tHEREOUIREMENTSof10cfA():IcnrceonroirnrNroImrIoooiiinpl(117$.71(4)7$.7)(c)DTHEAlsorcirrinAorrrectoiio>>rod.nTerr.rVIICfor<<<<$54AIVoluntary4AMEMichaelJ.Snyder,ShiftTechnicalAdvisorTELEPIrONE4VMBERAREACODE407465"3550COMPLE'TfONfLINEfOAEACHCOMPONENTFAILUREDESCRIBEDINTHISREPORT1121CAUSESYSTEMCOMPO454TMANLPAC.Ti,'AfREPOA-ABLETO4PRDSCAVSESYSTEMCOMPONENT4IANVFAC.TVREREPORTABLfTOherrDSSUPPLEMENTALAEPOATEXPECTED(141EXPECTEDSV5MISSIONDATE(151MO47viDAYvfARYESII'nCOMP~rrEXPECTEDSVSMrSSiOiVOATEI4OAssTRAcTILinvrrorepCroicrrir,roorov.i<<rrrII'Irri<<e<<prrroke~trorn<<rrinI.<<nl1141On15July,1989,whileSt.LucieUnitOnewasshutdown,itwasdiscoveredthattheReactorContainmentFanCoolers(RCFC)hadfiltermediainplaceduringpoweroperations.TheRCFCfiltersreducefoulingofthesystem'scoolingcoilswhentheunitisshutdown.FilterswereinstalledduringtheFebruary1987refuelingoutage,werereplacedduringtheJuly1988refuelingoutageandleftinstalleduntilJuly,1989.Thecauseofthiseventwasduetoinadequatemaintenanceinstructions.Thefilterswereremoved,andanEngineeringevaluationisbeingpreparedtoverifyfilterperformanceunderaccidentconditions.St.LucieUnitTwoRCFCwereverifiedtohavefiltersremoved,maintenanceinstructionswillberevised,andothersafetyrelatedcomponentswerecheckedforimproperlyinstalledfilters.Thiseventwasdeterminednottobereportableunder10CFR50.72or50.73andisbeingsubmittedforinformationalpurposes.NACperi<<$44195$1 NRCfeIAI388AWQI~LICENSEEEVE:TREPORT(LER)TEXTCONTINUATIU.S.NUCLEARREGULATORYCOMMISSIONAPPROVEOOM8NO.3150WI04EXPIRES:8/31/NlfACILITYNAMEIlIOOCKETNUMSER121YEARLERNUMSER18)+SI55OVENTIALr@INVM58AEVI5IONNVM5APAGELSISt.Lucie,UnitOneTOIT/8'AMleNMCP8/59VIREV5444RRMA4/H/IChem3/5348/(Itl0500033502OFDESCRIPTIONOFEVENT:On15July,1989,whileSt.LucieUnitOne(PSLl)wasshutdownforaSteamGenerator(EIISIAB)tubeplugreplacementoutage,aninspectionoftheReactorContainmentFanCoolers(EIISIBK)(RCFC)showedthattheprefiltermediaforthesecoolerswasexcessivelydiscolored.ThesystemTechnicalManualfortheRCFCimpliesthattheprefiltermediashouldonlybeusedduringshutdownmodesofoperationtoreducefoulingofthecoolingcoilsduringconstructionormaintenance.TheprefilterswereinstalledduringtheFebruary1987refueling.outageandremainedinplaceuntilthenextrefuelingoutageofJuly,1988.NewfiltersinstalledduringtheJuly1988outagewereleftinplaceuntilJuly1989.Thelengthoftimethesefilterswereinstalledpromptedutilitypersonneltoinitiateanoperabilityassessmentonpastsystemperformance.CAUSEOFTHEEVENT:Thecauseofallowingprefiltermediatoremaininplaceduringpoweroperationwasduetomaintenanceinstructionsnotstatingthatthefiltershouldbeusedonlyduringoutageperiods.ANALYSISOFEVENT:Technical,Specification3/4.6.2.3addressesthesurveillancerequirementsandthebasesforthecontainmentcoolingsystem.TheoperabilityoftheRCFCensuresthat1)thecontainmentairtemperaturewillbemaintainedwithinlimitsduringnormaloperation,and2)adequateheatremovalcapacityisavailablewhenoperatedinconjunctionwiththeContainmentSpraySystemsduringpostulatedlossofcoolantaccidentconditions.ThesurveillancerequirementsfortheRCFCweremetunderpastsystemperformance.Thebasesofsystemoperationweresatisfiedasfollows:1)NormalcontainmentairtemperaturewasmaintainedwithinthelimitssetbyPSL1TechnicalSpecification3/4.6.1.5.Also,theRCFCmanufacturer,Westinghouse,analyzedtheresultsofdifferentialpressure(dp)measurementstakenoneachofthefourcoolingfansanddeterminedthattheasfoundfilterresistancewasnotaproblemduringnormalandpostulatedaccidentmodeoperation.Themeasureddpwaslessthanthemaximumdpfortherecommendedfilters.Therefore,theminimum"airflowrequirementfortheRCFCwasneverviolatedunderpastsystemperformance.NRCPOAM545Ar4USGPOII9880824538/455 NRCform388A(Q4)3)LICENSEEEVEREPORT{LER)TEXTCONTINUATIO)U.S.NUCLEARREOULATORYCOMMISSIONAPPROVEOOMSNO.3150-0104EXPIRES:8/3'I/88FACILITYNAMEII)DOCKETNUMBERll)LERNUMBERIS)PACE(3)St.Lucie,UnitOneTEitT/SRSNoCfoco/4oqulor/Uoo/aP/N/one////)C%%dnR38SA'4)IIT)05000335YEARrPPv.SEOUENTIALNUMSERREVISIONNUMSER03OF2)Section6.2ofthePSL1FUSARdescribesthedesignbasesandminimumrequirementsforcontainmentheatremovalsystems.Anyoneofthefollowingthreesubsystemswillprovideatleastminimumheatremovalcapabilitynecessarytolimitandreducethepostaccidentcontainmentpressureandtemperature:allfourcontainmentfancoolers(100percentcapacity),eitherofthetwocontainmentspraytrains(EIISIBE)(100percentcapacityforeachsubsystem).Evenassumingtheworstcase,noRCFCavailableandasingleactivefailureinoneofthetwocontainmentspraytrains,thesafetyfunctionofcontainmentheatremovalwouldhavebeenmetwiththeremainingoperablecontainmentspraysubsystem.Basedontheabove,itcanbeconcludedthatthehealthandsafetyofthepublicwerenotaffectedatanytimewiththecontinuousinstallationofprefiltersintheRCFC.Thiseventisnotdeemedreportableaspertherequirementsof10CFR50.73,orofanyoperationorconditionprohibitedbySt.LuciePlant'sTechnicalSpecifications.However,thisreportisbeingsubmittedforinformationalpurposes.CORRECTIVEACTIONS:1.St.LucieUnitTwo'sRCFCsystemTechnicalManualexplicitlystatesthattheprefiltermediashouldberemovedpriortopoweroperation.AninspectionofUnitTwo'sRCFCon15JulyconfirmedthatalloftheRCFCprefiltermediawasremovedbeforetheunitbeganpoweroperations.2.TestswereruntomeasurethedpacrosseachfilterandcoolingunitforPSL1.Thesetestrunsweremadetoaddresspossibleoperabilityconcernsoverapotentiallyhighfilterdp.ApreliminaryEngineeringevaluationdeter'minedthattheRCFCwereoperablewithprefiltersinstalledduringpoweroperation.3.TheprefilterswereremovedfromthePSLlRCFCandwillnotbeusedduringpoweroperations.r4.AnEngineeringsafetyevaluationisbeingperformedto,determinetheenvironmentalqualificationofthefiltermediaandtheperformanceofthesefiltersunderpostulatedaccidentconditions.ContactwithWestinghouse,FloridaFilters(supplierofthefiltermedialastused),andothermaterialmanufacturershasbeenestablishedinordertoassesspastperformancecapabilitiesoftheRCFC.NRCCORM344A)8831oU.S.GPO:I9880.824538/~55 kllCPocMS44AIbbb>LICENSEETREPORT(LER)TEXTCONTINUAV$IIVCLEAIIAEGVLATOIIYCOMMIS'PPIIOVEOOMbIIOSISO&104EXPIIIE$.b/SIIEEIPACILITYNAMEillSt.Lucie,UnitOneTEXT(/vere4S444b14EMPSKE444~iVIICAsmJXA'4)(17lOOCKETIIUMSESI(SS05000335YSAALEllRUMSEAlblSSGVCHT<AL~NUMSAASM+IQHMMM4ApPAGEulpgOF5,PSL1'sTechnicalManualonRCFCwillbechangedtoexplicitlyprohibitleavingfiltermediaonthefansduringpoweroperation.6.Othersafety-relatedcomponentswerecheckedtoverifythatnoothercomponentshaveunanalyzedfiltersinstalled.ADDITIONALINFORMATION:COMPONENTFAILURESNonePREVIOUSSIMILAREVENTSNoneMACSOAM444A4U$GPOlbbb'062~'Sbb~