ML17229A361

LER 97-007-00:on 970502,reactor Coolant Pump Oil Collection Sys Was Outside App R Design Bases.Identified Leak Sites Were Repaired & Mods to RCP Oil Collection Sys to Capture Any Future Leakage from areas.W/970529 Ltr

ML17229A361
Person / Time
Site:	Saint Lucie
Issue date:	05/29/1997
From:	FREHAFER K W, STALL J A FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
L-97-0137, L-97-137, LER-97-007, LER-97-7, NUDOCS 9706040241
Download: ML17229A361 (8)

Text

CATEGORY1REGULATORYIViFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9706040241DOC.DATE:97/05/29NOTARIZED:NOFACIL:50-335St.LuciePlant,Unit1,FloridaPower&LightCo.AUT3',.k>AMkAUTHORAFFI'..:AIONFREH:;."ER,K.W.FloridaPower&LightCo.STALu,J.A.FloridaPower&LightCo.RECIP.NAMERECIPIENTAFFILIATIONDOCKET05000335

SUBJECT:

LER97-007-00:on970502,reactorcoolantpumpoilcollectionsyswasoutsideAppRdesignbases.Identifiedleaksiteswererepai.ed&modstoRCPOilColleconSvstocaptureanyfutureleakagefromareas.W/9705291rr.DISTRIBUTIONCODE:ZE22TCOPIESRECEIVED:LTRENCLSIZE:TITLE:50.73/50.9LicenseeEventReport(LER),IncidentRpt,etc.NOTES:ERECIPIENTIDCODE/NAMEPD2-3PDINTERNAL:ACRSAEOD/SPD/RRABNRR/DE/ECGBNRR/DE/EMEBNRR/DRCH/HICBNRR/DRCH/HQMBNRR/DSSA/SPLBRES/DET/EIBEXTERNAL:LSTLOBBYWARDNOACPOORE,W.NRCPDRCOPIESLTTRENCL111111111111111111111111RECIPIENTIDCODE/NAMEWIENS,L.EOD$4,PD/RAB..FIIECENTERNRR/DE/EELBNRR/DRCH/HHFBNRR/DRCH/HOLBNRR/DRPM/PECBNRR/DSSA/SRXBRGN2FILE01LITCOBRYCEiJHNOACQUEENER,DSNUDOCSFULLTXTCOPIESLTTRENCL112211111111111111111111RYDENNOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE.TOHAVEYOURNAMEORORDANIZATIONREMOVEDFROMDISTRIBUTIONLISTSORREDUCETHENUMBEROFCOPIESRECEIVEDBYYOUORYOURORGANIZATION,CONTACTTHEDOCUMENTCONTROLDESK(DCD)ONEXTENSION415-2083FULLTEXTCONVERSIONREQUIREDTOTALNUMBEROFCOPIESREQUIRED:LTTR25EiVCL25 floridaPower&LightCompany,6501SouthOceanDrive,JensenBeach,fL34957May29,1997L-97-013710CFR50.73U.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555Re:St,LucieUnits1and2DocketNo.50-335ReportableEvent:97-007DateofEvent:May2,1997ReactorCoolantPumpOilCollectionSystemTheattachedLicenseeEventReportisbeingsubmittedpursuanttotherequirementsof10CFR50.73toprovidenotificationofthesubjectevent.Verytrulyyours,J.A.StallVicePresidentSt.LuciePlantJASIKWFAttachmentcc:RegionalAdministrator,USNRCRegionIISeniorResidentInspector,USNRC,St.LuciePlant970b04024i970529PDRADOCK05000335SPDRlllllllllllllllllllllllillllllllillllll.anfPLGroupcompany NRCFORM366(4-95)U.S.NUCLEARREGULATORYCOMMISSION'LICENSEEEVENTREPORT(LER)(Seereverseforrequirednumberofdigits/charactersforeachblock)APPROVEDSYOMBNo.3160C104EKFmES04130rssESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISMANDATOINFORMATIONCOLLECTIONREOUEST:60.0HRS.REPORTEDLESSONLGVlNEOAREINCORPORATEDINTOTHEUCENSINGPROCESSANDFBACKTOBIOUSTRY.FORWARDCOMMENTSREGARDINGBURDENESTIMATTOTHEINFORMATIONANDRECORDSMANAGEMENTBRANCHIT%F33IU.S.NVCLEARREGULATORYCOMMISSION.WASHINGTON,DC20665<001ANOTOTHEPAPERWORKREDUCTIONPROJECT(3160<leer,OFHCE0MANAGEMENTANDBUDGET,WASHINGTON,OC20503.FACIUTYNAME11lSTLUCIEUNIT1DOCKETNI3IISIFI(2105000335PAGE1311OF4TITLE(41ReactorCoolantPumpOilCollectionSystemOutsideAppendixRDesignBasesOAYYEAR297SEOUENTIALREVISIONNUMBEANUMBER97-007-0MONTHDAYYEAR52997FACIUTYNAMESt.LucleUnit2FACIUTYNAMEDOCKETNUMBER05000389DOCKETNUMBOl05000OPERATINOMDDE(9)POWERLEVEL(10)10020.2201(b)20.2203(a)(2)(I)20.2203(0)(2)(iii)20.2203(a)(2)(iv)20.2203(a)(2)(v)20.2203(a)(3)(ii)50.36(c)(1)50.36(c)(2)50.73(a)(2)(i)50.73(a)(2)(iii)50.73(a)(2)(v)50.73(a)(2)(vii)50.73(a)(2)(viii)73.71OTHERSpecifyblAbetrectbeloworinNRCForm366ANAMEK.W.Frehafer,LicensingEngineerTELEPHONENUMBERSneludeAresCedei(561)468-4284CAUSESYSTEMCOMPONENTMANUFACTURERR~ABLETONPROSggi4$9pVtI'rM+EL9~%P~k%CAUSESYSTEMCOMPONENTMANUFACTUREAREPORTABLETONPADSYES(Ifyes,completeEXPECTEDSUBMISSIONDATE).XNoEXPECTEDSUBMISSIONDATE(15)MONTHOAYYEARABSTRACT(Umitto1400spaces,i.e.,approximately15single-spacedtypewiittenlines)(16)OnMay2,1997,St.LucieUnit1wasat100percentpower,andSt.LucieUnit2wasinMode6anddefueledforarefuelingoutage.AnoutageinspectionoftheUnit2ReactorCoolantPumps(RCPS)identifiedminorexternaloilleakageattheupperandlowerRCP'motoroilreservoirlocationsthatwasnotcapturedbytheRCPOilCollectionSystem.AppendixRSectionIII.OrequiresthattheRCPOilCollectionSystembedesignedtocollectoilfromallpotentialRCPoilleakagesources.ThecauseofthiseventwasduetodesigndeficienciesoftheRCPOilCollectionSystem.Correctiveactionincluderepairstoidentifiedleaksites,andmodificationstotheRCPOilCollectionSystemtocaptureanyfutureleakagefromtheseareas.NRCFOAM366(4.96)

NRCFORM388AI4-95)LZCENSEEEVENTREPORT(LER)TEXTCONTINUATIONU8,NUCLEARRMUIATORYCOMMISSIOSt.LucieUnit105000335YEARSEQUENTIALREVISION97-007-02OF4TEXT(ifmorespeceisrequired,useedditionelcopiesofNRCForm366AJI17lOnMay2,1997,St.LucieUnit1wasat100percentpower,andSt.LucieUnit2wasinMode6anddefueledforarefuelingoutage.AnoutageinspectionoftheUnit2ReactorCoolantPumps(RCPs)[EIIS:AB:P]identifiedexternaloilleakagenotcapturedbytheRCPoilcollectionsystem.TheexistingRCPOilCollectionSystemdesignconsistsofthreeoildripenclosuresandfivedrippansoneachreactorcoolantpumpmotor.Agravitydrainpipingsystemisprovidedtotransportanyaccumulatedoilfromthesedevicestoa225gallonoilcollectiontank.Thetankisventedandprovidedwithaflamearrestorwithamagneticliquidlevelgagetoprovidelocalindicationofoilinthetank.Thecollectiondevicesaredesignedtocollectoilleakagefromthefollowingpotentialleakagesources:1.2.3.4,Theliftoilsystem,allflangedconnectionsontheoilcoolers&circulatingoilpiping,oilfillanddrainlines,and,oillevelinstrumentationpiping.TheUnit2RCPinspection'otedoilleakageatboththeupperandlowerRCPmotoroilreservoirlocations.Theinvestigationintothesourceoftheoilfromthelowerreservoiridentifiedminorweepagefromthe"piepan"(loweroilreservoirtopaccesscovers)/RCPshaftsealarea.Becauseofthesmallamountofoilleakage,itisnotpossibletopositivelyconfirmwhetherthesourceisfromtheRCPshaftsealorthe"piepan"covers.TheinvestigationintothesourceofleakagefromtheupperoilreservoiridentifiedaleakingRCPbearingresistancetemperaturedetector(RTD)penetrationfittingonthemotortophat,whichallowedoiltocollectontopoftheRCPmotorhousingandrundownthesideofthemotor.Theseleakagesitesareatatmosphericorlowpressuresandarelocatedabovethenormalupperandlowerreservoiroillevels.However,theselocationscanpotentiallyleaksmallamountsofoilduetotheoilsplashcausedbytherotatingcomponentsinsidetheoilreservoirs.ItwasthereforedeterminedthatthedesignoftheRCPOilCollectionSystemwasdeficientinthatnotallpotentialoilleakagesourceshaveprovisionsforcollection.TheoriginalRCPOilCollectionSystemdesigndidnotconsiderthethesecomponentpartstobepotentialleakagesourcesbecausetheirlocationsareabovethenormaloperatingoilreservoirlevel.Additionally,thelowerreservoiroperatesonlyataslightlypositivepressureandtheupperreservoiroperatesatatmosphericpressure.Thepotentialforleakageduetooilsplashwasnotconsideredintheoriginaldesign.Therefore,nodesignfeatureswereprovidedtocollectoilfromtheselocations.NRCFoRM366AI495I

NRCFORM366AI4-96ILICENSEEEVENTREPORT(LER)TEXTCONTINUATIONU.S.NUCLEARREGULATORYCOMMISSISt.LucieUnit105000335YEARSEQUENTIALREVISION97-007-03OF4TEXT'ilfmorespeceisrequired,useedditionalcopiesofNRCFarm366AiI17)TheRCPOilCollectionSystemdesignisrequiredtomeettherequirementsof10CFR50AppendixRSectionII.O,whichstatesthat"thesystemshallbesodesigned,engineered,andinstalledthatfailurewillnotleadtofireduringnormaloperationordesignbasisconditionsandthatthereisreasonableassurancethatthesystemwillwithstandtheSafeShutdownEarthquake.Suchcollectionsystemsshallbecapableofcollectinglubeoilfromallpotentialpressurizedandunpressurizedleakagesitesinthereactorcoolantlubeoilsystems."However,theSt.LucieRCPOilCollectionSystemdesignisdeficientinthatnotallpotentialoilleakagesiteshaveprovisionsforbeingcollected.Therefore,itwasdeterminedthatthisconditionwasreportablebecausetheRCPOilCollectionSystemwasoutsideoftheAppendixRSectionIII,Odesignbases.BecauseUnit1andUnit2havesimilarRCPmotorsandoilcollectionsystems,thedesigndeficienciesassociatedwiththeupperoilreservoirtophatareaandtheloweroilreservoirshaftseal/"piepan"areaareapplicabletobothUnits1and2.Thefollowingassessmentwasmadetodeterminethefirepotentialresultingfromanyuncollectedoilattheselocations.Theidentifiedleakagesiteswereassessedinordertocharacterizeanypostulatedleakageandresultantfirepotential~Thepotentialleakagesitesareeitherunpressurizedoronlyslightlypressurizedandarelocatedabovethenormaloperatingleveloftheoilreservoirs.Anypostulatedleakagewouldbefromtheoilsplashcausedbytherotatingcomponentsinsidetheoilreservoirs.Therefore,oilescapingfromthereservoirwouldnotbesprayed(atomized),butwouldresultinonlyminordripsofuncollectedoil~Thefirepotentialofsuchleakageisminimal;ifadripweretocomeincontactwithahotsurface(temperatureovertheignitiontemperature)itwouldnotaccumulate;thedropwouldburnbutnotsupportfurthercombustion.Ifitcomesincontactwithacoolsurfaceitcouldlocallyaccumulate,butwouldeventuallymigratetothefloor.Oillandingonthefloorwillbedirectedtofloordrainsbasedonfloorslope.Lubricatingoilontheflooorinthesumpisnotsubjecttoignitionbecausethefloorisavastheatsinkwhichwillmaintaintheoilatalowtemperatureandpreventitfromreachingitsignitionpoint.Therefore,thepotentialforafireresultingfromminoroilleakagefromtheselocationsisnotconsideredcredible.Inaddition,RCPmotorupperandloweroilreservoirlevelsaretrendedandreviewedonamonthlybasistoensurethatRCPlubeoilleaksareidentifiedduringplantoperation.AlthoughchangesinthecontainmenttemperatureandpressurecancausesmallvariationsinindicatedRCPoilreservoirlevel,anyappreciablelosofRCPlubeoilisdetectable.TherehavebeennosafetysignificantRCPlubeoilleaksidentifiedoneitherUnit1or2.NRCFORM368Al4.95I NRCFORM366AI4-95ILICENSEEEVENTREPORT(LER)TEXTCONTINUATIONU.S.NUCLEARRMULATORYCOMMISSIOSt.LucieUnit105000335YEARSEQUENTIALREVISION97-007-04OF4TEXTItfmorespaceisrequired,useadditionalcopiesofNRCForm366AJI17)ContinuedoperationofUnit1isjustifiedbasedontheabovediscussionandthefollowingadditionalinformation.Currently,theSystemEngineerhasconcludedthatnosignificantoilleaksarepresentinanyoftheUnit1RCPs,basedondatacollectedoverthelastsixmonths.Additionally,theinspectionofthe.RCPs,duringtherecentUnit1ShortNoticeOutage(SNO)onApril19,1997,didnotidentifyanysignificantexternaloilleaks.Anoilfilmonthe1A1RCPandplatformwasnoted.Eventhoughtheprecisesourceofthisoilfilmisnotknown,itisevidentthattheexistingminoroilleakagehasnotcomeincontactwithanignitionsourceincontainment.Thus,itisreasonabletoassumethatfurtherleakagefromthesamelocationwouldalsonotcomeincontactwithignitionsources,andthatafireincontainmentfromexistingpotentialleakagesourcesisnotlikely.1~Theuncollectedoilwascleanedup.2.Workorderswereissuedtorepairtheidentifiedleakingpenetrationsandtoresolveleaksonthelowerreservoirs.3.AstepwasaddedtotheRCPGeneralInspectionandRepairMasterPWOtaskdescriptiontoaddressproperinstallationofthelowerreservoir"piepan"covers.4.TheRCPinstrumentationremoval/reinstallationMasterPWOtaskdescriptionwillberevisedtoensureadequateprovisionsforinstallingandsealingpenetrationfittings.5.PCM97-025wasimplementedontheUnit2RCPOilCollectionSystemtoensurethatanyfutureoilleakagefromthemechanicalpenetrationswouldbecapturedbythesystem.6.SimilarmodificationswillbeimplementedontheUnit1RCPOilCollectionSystemduringtheFall1997refuelingoutage.None.NRCFORM368AI4-95I kJ