ML18018B265

LER 78-006-00 for Nine Mile Point, Unit 1 Re During Steady State Operation, Performance of Surveillance Test IC-75 Found a Trip Setpoint of 22.5 Inches Water on One Vacuum Switch in the Vacuum Relief System from the Pressure Suppression Cha

ML18018B265
Person / Time
Site:	Nine Mile Point
Issue date:	02/24/1978
From:	Schneider R R Niagara Mohawk Power Corp
To:	Grier B H Office of Nuclear Reactor Regulation, NRC Region 1
References
NMP-0124 LER 78-006-00
Download: ML18018B265 (10)

Text

REGULATORYINFORMATIONDISTRIBUTIONSYSTEM<RIDS)DISTRIBUTIONFORINCOMINGMATERIAL50-220REC'RIERBHNRCORG:SCHNEIDERRRNIAGARAMOHAWKPWRDOCDATE:02/24/78DATERCVD:03/07/78DOCTYPE:LETTERNOTARIZED:NOCOPIESRECEIVED

SUBJECT:

LTR0ENCL1LICENSEEEVENTREPT<RO50-220/78-06)ON01/27/78CONCERNINGPERFORMANCEOFSURVEILLANCETESTIC-75FOUNDATRIPSETPOINTOF22.5INCHESWATERONONEVACUUMSWITCHINTHEVACUUMRELIEFSYSTEMFROMTHEPRESSURESUPPRESSIONCHAMBERTOTHERXBLDG(68-12B>.PLANTNAME:NINEMILEPT-UNIT1REVIEWERINITIAL:XJMDISTRIBUTOR.INITIAL:gQDISTRIBUTIONOFTHISMATERIALISASFOLLOWSINCIDENTREPORTS<DISTRIBUTIONCODEA002)FORACTION:INTERNAL:EXTERNAL:/4ENCLEGILE~~~~W/ENCLI8.E%~%SCHROEDER/IPPOLIT044W/ENCLNOVAK/CHECK++W/ENCLKNIGHT++W/ENCLHANAUER+4W/ENCLEISENHUT++W/ENCLSHAO++W/ENCLKREGER/J.COLLINS44W/ENCLKSEYFRIT/IE++W/ENCLLPDR'SOSWEGO'Y++W/ENCLTIC++W/ENCLNSIC+4W/ENCLACRSCATB++W/16ENCLNRCPDR44W/ENCLMIPC++W/3ENCLHOUSTON4+W/ENCLGRIMES++W/ENCLBUTLER++W/ENCLTEDESCO++W/ENCLBAER44W/ENCLVOLLMER/BUNCH>~W/ENCLROSA++W/ENCLDISTRIBUTION:LTR45ENCL45SIZE:iP+iPTHEENDCONTROLNB:780680044

~4.I~IhhIhhJt'V;.>'1:,"',"t,',4~*khh'It',"VIIIIIklhhIkh~l'~I,kk~h,PV"khtt"I4'hhh44,'I~VkIh,bI,K H((LQREMMHteI'F(NMP-0124NIAGARAMOHAWKPOWERCORPORATION/300ERIEBOULEVARDWEST,SYRACUSE,N.Y.13202/TELEPHONE(315)474-1511Febeuucg24,1978A..BogceH.G/L4.et,Mn.ecto/I.U~edStaf:e5NueLea/1.ReguZato/I.yCommissionRegionI631Pa/I.kAvenueKingo(Pm56~,PA.19406RE:SocketNo.50-220Pea/I.(k.G/Iie/I,:9~f//pe'+~,t@ZANcW/~Ay~~/Inacco/u(anceuIithNineNLePointNuct'.ea/I.S~onUnit>1Technicat'.Speci.+cation/,mehe/1ebysub~LicenseeEventRepo/LtLER78-06,IvhichLeinv~o~no(Section3.3.6.Fo)AeTechnicat'pecigcations.Th&aepoMuImcompletedinSheJotuIatdesignatedinNUREG-0161,datedJId'(g1977.Ve/I.y~ggo~,ORIGINALSIGNEPBYR.R.SCHNEISERR.R.Schneide/I,ViceP/I.u&e<-ELecttu.cP/I,odu~onn4nAttachments(3)xc:Nrce&on.,'0(I(iceo(18E(30copiu)Si/Iecto/L,0(pceo(h(IPC(3copim)78pggo NRCFORM3GG(777)U.S.NUCLEARREGULATORYCOMMISSION~o78CON'T~0178Qs.022478QgsoURGEMLQG50002206061DOCKETNUMBER6869EVENTDATE7475REPORTDATE80EVENTDESCRIPTIONANDPROBABLECONSEQUENCESQ10DurinsteadstateoerationerformanceofsurveillancetestIC-75LICENSEEEVENTREPOR~~~CONTROLBLOCK:QI(PLEASEPRINTORTYPEALLREQUIREDINFORMATION)I6NYNNP1QE00-00000-00Q341111QE~QELICENSEECODE1415LICENSENUMBER2526LICENSETYPE3057CAT58~03foundatrisetointof22.5incheswaterononevacuumswitchinthe~o4vacuumreliefsstemfromtheressuresuressionchambertotheRx~o5Buildin(68-12B).T.S.3.3.64Freuiresasetointlessthanorequal~oGto0.5si13.85incheswater.Thisconditionresultedinminimal~o7safetimlications.Aredundantswitchwasavailabletoinitiate~osoerationofthevacuumreliefvalve.78980~OsSYSTEMCAUSECAUSECOMP.VALVECODECODESUBCODECOMPONENTCODESUBCODESUBCODE~SAQ>>EQ13~6Q13INSTR004~SQPE~ZQPE78910111213181920SEQUENTIALOCCURRENCEREPORTREVISIONLEAPPAOEVENTYEARREPORTNO.CODETYPENO.Q17REPQRT~78~~006~~~03~L~02122232426272829303132ACTION4FUTUREEFFECTSHUTDOWNATTACHh'IENTNPADPPRIMECOMP.COMPONENTTAKENACTIONONPLANTMETHODHOURS22SUBMITTEDFORMSUB.SUPPLIERMANUFACTURERgJQ~QgJgJQo"Q33~Q34~QEEQEE3334353637404142434447CAUSEDESCRIPTIONANDCORRECTIVEACTIONSQ27oThecauseofthefailurewasinstrumentdriftinamercoidmodelCP4122vacuumswitch.Tripsetpointwasresetto6.8incheswater.Currentsurveillancetestingschedulesareadequatetoensureearlydetectionoffutureinstrumentdrifts.789FACILITYSTATUS66POWEAOTHERSTATUSQ15E2S9629NAQ~0QACTIVITYCONTENTRELEASEDOFAEI.EASEAMOUNTOFACTIVITYQZQ33~ZQ34nA7891044PERSONNELEXPOSURESNUMBERTYPEDESCRIPTIONQ397~000Q37ZQ33NA789111213PEASONNELIN3URIESMETHODOFDISCOVERYDISCOVERYDESCRIPTIONQ2~BQ31Survei11anceTesting4546LOCATIONOFRELEASEQ45808080807878n,7NAMF-OFPREPARERDennisMacVittie91112LOSSOFORDAMAGETOFACILITYQ43TYPEDESCRIPTION~ZQ42NA910PUBLICITYISSUEDDESCRIPTIONlNIWnINA80NRCUSEONLYItii1J.L.LLL..LiI'7J315-343-2110ext.]5580,PHONE:a NRCFORh1'366I777)U.b.NVCLFARHEUULATOHYCL7<IIPIlb>ICJENIIPLEASEPRINTORTYPEALLREOUIREOINFORMATIONI6102001000001415LICENSENUAIBER00Q24IIIIQE~QE2526LICENSETYPE'057CAT58ICENSEEEVENTREPORTP(ONTROLBLOCK:I~orNIYN.I'IP789I.ICENSEECODECON'T~orEov'REE~LQE050.0022QT.O8022478786061DOCKETNUMBER6869EVENTDATE74~75REPORTDATE80EVEITITDESCRIPTIONANOPROBABI.ECONSEQUENCES10~ozBurinsteadstateoerationerformanceofsurveillancetestIC-75~o2foundatripsetpointof22.5incheswaterononevacuumswitchinthe~oRvacuumreliefsstemfromtheressuresuressionchambertotheRx~osBuildin(68-128.T.S.3.3.6.Frequiresasetpointlessthanorequ'al~o8to0.5si13.85inchesivater.Thisconditionresultedinminimal~oTsafetimIications.Aredundantswitchwasavailabletoinitiate~o8oarationofthevacuumreliefvalve.7898078SYSTES1CAUSECAUSECOMP.VALVECODECODE"SUBCODECOMPONFNTCODESUBCOOESUBCODE~SAQ~EQ~EQINSTR0Q~SQ~2cl910111213181920SEQUENTIALOCCURRENCEREPORTREVISIONLEREPROEVENTYEARREPORTNO.CODE>YPENO.QirREPQRT~78~~006~m~03~L~~0212223,2426272829303132ACTION,FUTUREEFFECTSHUTDOWNATTACHA1ENTNPROKPRIMECOMPCOMPONcNTTAKENACTIONONPLANTMETHOD~OURS22SUBS11TTEDFORMSUB,SUPPLIERMANUFACTURERQ18LIEO>>~2O20~2Q21000~~NQ22~TOTE~NQzsN235Q283334353637404142434447CAUSFDESCRIPTIONANDCORRECTIVEACTIONS'27oThecauseofthefailurewasinstrumentdriftinamercoidmodelCP4122vacuumswitch.Tripsetpointwasresetto6.8incheswater.Currentsurveillancetestingschedulesareadequatetoensureearlydetectionoffutureinstrumentdrifts.4789FACILITY~STATUS<<8POWEROTHERSTATUSSE2809629NA787891112LOSSOFORDAMAGETOFACILITYQ43TYPEDESCRIPTION2Q42NA910PUBLICITYISSUED~DESCRIPTION~6)E~EEIEADennist1acVittieNAMEOFPREPARERCOLJO~OACTIVITYCONTENTREI.EASEDOFRELEASEAMOUNTOFACTIVITYQ8~2Qzz~2QEENA789101144PERSONNELEXPOSURESNUMBERTYPEDESCRIPTION~I7~000QTT~LQ28NA789111213PERSOiNiNELINJURIESNUMBERO'ESCRIPTIONQ~000QioNAI,IETHQDOFDISCOVERY~BQSI4546NADISCOVERYOESCRIPTIQi'4Q3SurveillanceTestingLOCATIONOFRELEASEQB808080808080NRCIJSEONLYIIIIII.I.I..I.III"",315-343-2110ext.1558PHONE:

To:PIB-39~)~)rooN.3fa-gQ2lg~or<TL/TorY<iŽ(lil~~.riGl'w:;b~:r',lelephonclou::il~ciTO:DirectorofPco>>lat<<ryOperationOSl;lKl.-.:ir,nI63lPari:l:;encl:in@nfPros'ia,Ph.19406Frooi:HiirgaralTol:a';cl;Po.jcrCorporationbinehilt.Point,DuelcdrStationU>>ltfiTP0.Bor.i<32Lp'colllin9,hcl'IYork13093SUPiilECT:PP.Ol',1'TRl.PO.,TN)].!!OCD).J)El'CEDOC):l'.Tl'0."0-220LICLl!SEl!0.DPR-G3ASSJ(islEDLERHO.'8-09CYGNETDATE:78022EREPORTDf<TE:78022IEVErlTDFSCRIPTTnrl:SEEATTACHED.CO:(POlKliTSIl'OL"ED:TIPmachineshearva'1vesqufbdevices,CAUSEl(t!DRKr':ENf(LACTIDILcircuitperGErevisi'onInstitutionofmodiffcationinsquibFE(CILITVSTATUS=c)RoutineStartopd)Routln~Sll::dc"ne)stea<rys:.iieopLl-~f)LoadCl'.-.ageS;TllEt:Wnt.bi(1840Slwit<foi~orefuellngOtherl(otlippj'IcBI>ILILi'riticnfollow-uprcportwillbesentv;itbini<iov.'ccl:s.vr..roonro3576.H:ill.roo~rV:P.~~a"owLa2.illMH.

ATTACHMENTTOLER78-09EventDescription:DuringroutinestationoperationwiththeTIPdetectors.withdrawn,repTacementexplosivechargesintheTIPsystemshearvalveswerereplcaedwithnewcharges.Followingreplacement,itwasfoundthattheohmnetercontlnuitytestforacceptableeTectriccontactwasunsatisfactory.ThenormalTIPtubetsoTaticmsystemwas.operabTeatthistime.IItwasfoundthartthe.actualetectricaVconnectionstothe.explosivechargeswerenetas-described-4nthemaStenance-procedure.-Theshear.valveswouldnothaveoperatedto5solatetheTIPguide.tubawitlrtheTIpinsertedDectricalconnectionsvillbecheckedandtestedtoassure.thattheexplosive.va7.veswAloperateasdescribedintheoperaticprocedures."..Stationrecords;including.theau6ntenance.-.procedures,-wfTT=becorrectedtoreflectthecorrect.wirinyconnectionsAnend-ta-enddemonstration-at'he.explosiveshearva7ves=willbeperformed'iththeexplosivechargeremoved.from..the,system..'orrectiveactionwfllbecompTetedbeforetheTIPsystemisagainusedrTheexplosiveoperatedTIPsheartsolationvalvesareaback-upsystemtobeusedforisa'EatioeoftheTIPtubesintheeventitisnotpossible.tewfthdrwrthe.detectnrsethenormaTautomat%a.i.soTationsystemmayfunction