ML17263A636

LER 94-022-01:on 940202,determined That Containment Pressure Channels P-947 & P-948 Were Inoperable.Caused by Obstruction of Common Pressure Sensing Line.Corrective Action:Iron Oxide Scale Was Removed & Channels Declared operable.W/940502 L

ML17263A636
Person / Time
Site:	Ginna
Issue date:	05/02/1994
From:	MECREDY R C, ST MARTIN J T ROCHESTER GAS & ELECTRIC CORP.
To:	JOHNSON A R NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation
References
LER-94-022, LER-94-22, NUDOCS 9405090121
Download: ML17263A636 (16)

Text

ACCELERATEDDISTRIBUTIONDEMONSTRATIONSYSTEMREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9405090121DOC.DATE:94/05/02NOTARIZED:NODOCKETFACIL:50-244RobertEmmetGinnaNuclearPlant,Unit1,RochesterG05000244AUTH.NAMEAUTHORAFFILIATIONST.MARTIN,J.T.RochesterGas&ElectricCorp.MECREDY,R.C.RochesterGas&ElectricCorp.RECIP.NAMERECIPIENTAFFILIATIONRJOHNSONIAR~ProjectDirectorateI-3D-S.A0500024.4.DNOTES:LicenseExpdateinaccordancewith10CFR2,2.109(9/19/72).

SUBJECT:

LER94-022-01:on940202,determinedthatContainmentPressurechannelsP-947&P-948wereinoperable.Causedbyobstructionofcommonpressuresensingline.Correctiveaction:ironoxidescalewasremoved&channelsdeclaredoperable.W/940502ltr.DISTRIBUTIONCODE:IE22TCOPIESRECEIVED:LTRfENCLISIZETITLE:50.73/50.9LicenseeEventReport(LER),IncidentRpt,etc.RECIPIENTIDCODE/NAMEPD1-3PDINTERNAL:AEOD/DOAAEOD/ROAB/DSPNRR/DE/EMEBNRR/DRCH/HHFBNRR/DRCH/HOLBNRR/DRSS/PRPBNRR/DSSA/SRXBRES/DSIR/EIBEXTERNAL:EG&GBRYCE,J.HNRCPDRNSICPOORE,W.COPIESLTTRENCL111122111111221111221111RECIPIENTIDCODE/NAMEJOHNSON,AAEOD/DSP/TPABNRR/DE/EELBNRR/DORS/OEABNRR/DRCH/HICBNRR/DRIL/RPEBNRR/DSSA/SPLBEGEIL~02GÃ1FILE01LSTLOBBYWARDNSICMURPHY,G.ANUDOCSFULLTXTCOPIESLTTRENCL1111111111111111111111111D'S."'R25'ets/0205DNOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESKROOMPl-37(EXT.20079)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!FULLTEXTCONVERSIONREQUIREDTOTALNUMBEROFCOPIESREQUIRED:LTTR27ENCL27 ROCHESTERGASANDELECTRICCORPORATION489EASTAVENUE,ROCHESTERMY.14849-0001uf8rosestartROBERTCAtECREDYVicePresidentCinnaNuclearProductionTEl.EPHONEAREACOOE71d5462700May2,1994U.S.NuclearRegulatoryCommissionDocumentControlDeskAttn:AllenR.JohnsonProjectDirectorate1-3Washington,DC20555

Subject:

LER94-022,Rev'isLor~f,::,ContainmentPressureTransmittersInoperableDuetoBlockageofSensingLinebyCorrosionProducts,CausesaConditionProhibitedbyTechnicalSpecificationsRG&EGinnaNuclearPowerPlantDocketNo.50-244Inaccordancewith10CFR50.73,LicenseeEventReportSystem,item(a)(2)(i)(B),whichrequiresareportof"Anyoperationorconditionprohibitedbytheplant'sTechnicalSpecifications",theattachedLicenseeEventReportLER94-002,Revlstoit'::,::,'1::,isherebysubmitted.nis'ci',::!rn'oI'u'ds'd"rn'!titrs'"'reycIs'io'ri;::ssYi&n~cvsrncv~:srasrtssswThiseventhasinnowayaffectedthepublic'shealthandsafety.Verytyyours,RobertC.Mecreyc:U.S.NuclearRegulatoryCommissionRegionI475AllendaleRoadKingofPrussia,PA19406GinnaSeniorResidentInspector8rQzP7+w/wA~~94050'70121'F405020~G0A0PDRADOCK05000244SPDR NRCFORM366(5-92).S.NUCLEARREGULATORYCOIIIISSIONPROVEDBYOMBNO.3150-0104EXPIRES5/31/95LICENSEEEVENTREPORT(LER)(Seereverseforrequirednumberofdigits/charactersforeachblock)ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIOHREQUEST:50.0MRS.FORWARDCOMMENTSREGARDIHGBURDEHESTIMATETOTHEINFORMATIONANDRECORDSMANAGEMENTBRANCH(MNBB7714)eUS~NUCLEARRECUtATORYCOMMISSIOHeWASHINGTOH,DC20555.0001AHDTOTHEPAPERWORKREDUCTIONPROJECT(3140-0104),OFFICEOFMANAGEMENTANDBUDGETWASHINGTONDC20503.FAclLITYNAME(1)R.E~GinnaNuclearPowerPlantDOCKETNQGIER(2)05000244PAGE(3)1OFQTITLE(4)ContainmentPressureTransmittersInoperable,DuetoBlockageofSensingLinebyCorrosionProducts,CausesaConditionProhibitedbyTechnicalSpecificationsMONTHDAYYEARYEAREVEHTDATE5LERNINBER6SEQUENTIALHUHBERREVISIOHNUMBERMONTHDAYYEARREPORTDATE7OTHERFACILITIESINVOLVED8DOCKETNUMBERFACILITYNAME02029494--002--FACILITYNAMEDOCKETNUMBEROPERATINGIKXIE(9)POWERLEVEL(10)N09873.71(b)73.71(c)50.73(a)<2)(iv)50.73(a)(2)(v)20.405(c)50.36{c)(1)20.402(b)20.4D5{a)(1)(i)20.405(a)(1)(ii)20.405(a)(1)(iii)20.405(a)(1)(iv)20.405(a)(l)(v)50.36<c)(2)50.73(a)(2)(i)50.73(a)(2)(ii)50.73(a)(2)(iii)LICENSEECONTACTFORTHISLER1250.73(a)(2)(vii)50.73(a)(2)(viii)(A)50.73(a)(2)(viii)(B)50.73(a)(2)(x)OTHER(SpecifyinAbstractbelowandinText,NRCForm366ATHISREPORTISSUBMITTEDPURSUANTTOTHEREQUIREMENTSOF10CFR:Checkoneormore11NAMEJohnT.St.Martin-Director,OperatingExperienceTELEPHONENUMBER(IncludeAreaCode)(315)524-4446C(NPLETEONELINEFOREACHCNIPOHENTFAILUREDESCRIBEDINTHISREPORT13CAUSESYSTEHCOMPOHEHTMANUFACTURERREPORTABLETOHPRDSCAUSESYSTEMCOMPOHENTMANUFACTURERREPORTABLETOHPRDSSUPPLEMENTALREPORTEXPECTED14YES(lfyes,completeEXPECTEDSUBMISSIOHDATE).XxoEXPECTEDSUBMISSIONDATE(15)MONTHDAYYEARABSTRACT(Limitto1400spaces,i.e.,approximately15single-spacedtypewrittenlines)(16)OnFebruary2,l994,atapproximately1642EST,withthereactoratapproximately984steadystatepower,ControlRoomoperatorsdeterminedthatContainmentPressurechannelsP-947andP-948wereinoperable.Basedonpost-eventreviewofcomputerdata,thisconditionwasinviolationofTechnicalSpecificationTable3.5-2ActionStatements.Immediatecorrectiveactionwastodefeat.theinoperablechannelsbyplacingtheaffectedbistablesinthetrippedcondition.Theunderlyingcauseoftheeventwasanobstructioninthecommoncontainmentpressuresensinglineforp-947andP-948~!pipiultirigoiasat~ax':hiingjt:aprpjeid~n:aQa'mi.;il:p'oa"'nti!o&6~i'a,-!1>hei,::p.".;:.%hisyenFeriYiimano'eI'ndiaoeatoexi'-:e!p'ro'gr'am""cpan'set'i'c'8ii'ioi!a'."4)8@!'""Correctiveactionwastakentocleartheobstructionfromtheaffectedtubing,leaktestthepenetrationpipingandtransmittertubing,andverifytheproperoperationofP-947andP-948.CorrectiveactiontoprecluderepetitionisoutlinedinSectionV(B).NRCFORM366(5-92)

NRCFORM366A(5-92)U.SNUCLEARREGULATORYCQIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDB'YCNSNO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIOHREQUEST:50.0MRS.FORWARDCOMMENTSREGARDIHGBURDENESTIMATETOTHEINFORMATIONAHDRECORDSMANAGEMENTBRANCH(MHBB/l'14),U.S.NUCLEARREGULATORYCOMMISSION,WASHIHGTOH,DC20555-0001AHDTOTHEPAPERWORKREDUCTIONPROJECT(3140-0104),OFFICEOFMANAGEMENTAHDBUDGETWASHIHGTOHDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNINBER205000244LERNUMBER6SEQUENTIALREVISION94-002--PAGE32OF9'EXT(Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A)(17)PRE-EVENTPLANTCONDITIONSTheplantwasatapproximately989steadystatereactorpowerwithnomajoractivitiesinprogress.InstrumentandControl(I&C)DepartmentpersonnelwereinvestigatingContainmentPressurechannelP-947.ThisinvestigationwasinitiatedbyaMaintenanceWorkRequest/TroubleReport(MWR/TR)writtenJanuary20,1994byControlRoomoperatorsbecausetheMainControlBoardpressureindicationforP-947(PI-947)wasobservedtobereadingslightlylowerthantheindicationforContainmentPressurechannelsP-945andP-949(PI-945andPI-949),whicharealsoontheMainControlBoard.II.DESCRIPTIONOFEVENTA.DATESANDAPPROXIMATETIMESOFMAJOROCCURRENCES:oJune24,1992,1500EDST:Containment(CNMT)pressurechannelP-947outputindicationstartstobecomeinconsistentwithchannelsP-945andP-949,asmonitoredonthePlantProcessComputerSystem(PPCS).(Thisisbasedonpost-eventreviewofarchiveddataonthePPCS.)Eventdateandtime.oJanuary20,1994:ControlRoomoperatorssubmitMWR/TRonPI-947MainControlBoardindication.oFebruary2,1994,1642EST:Discoverydateandtime.oFebruary4,1994,0007EST:ContainmentPressurechannelP-947isrestoredtooperablestatus.oFebruary4,1994,1536EST:ContainmentPressurechannelP-948isrestoredtooperablestatus.NRCFORM366A(5.92)

NRCFORH366A(5-92)U.S.NUCLEARREGULATORY(XNIIISSIOHLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYOHBNO.3150-0104EXPIRES5/31/95ESTINATEDBURDENPERRESPOHSETOCOHPLYWITHTHISIHFORHATIOHCOLLECTIOHREOUEST:50.0HRS.FORWARDCOHHENTSREGARDINGBURDENESTIHATETOTHEINFORHATIONANDRECORDSHANAGEHEHTBRANCH(NNBB7714),U.S.NUCLEARREGULATORYCONHISSIOH,WASHINGTON,DC20555-0001AHDTOTHEPAPERWORKREDUCTIONPROJECT(3140-0104),OFFICEOFNANAGENENTANDBUDGETWASHINGTONDC20503.FACILITYNAKE1R.E.GinnaNuclearPowerPlantDOCKETNWBER205000244LERNIMBER6TEARSEQUENTIAL94--002--REVISIONPAGE3013OF9':4TEXT(Ifmorespaceisrequired,useadditionatcopiesofNRCForm366A)(17)B.EVENT:OnJanuary20,1994,ControlRoomoperatorsobservedthatoneMainControlBoardindicationforCNMTpressure,PI-947,wasreadingslightlylowerthantheothertwoindicators,PI-945an'dPI-949.TheyinitiatedaMWR/TR,forI&Cpersonneltoinvestigatethedifferenceinreadings.OnJanuary21,I&Cperformedtheannualcalibrationofthechannel.Thechannel(P-947)respondedproperlytoboththeelectronicchecksandtoactualpressuresignalsinsertedintothetransmitter(PT-947).Afterreviewingpost-calibrationtrendingdataandarchivedPPCScomputertracesofCNMTpressure,I&CnoticedthatchannelP-947wasstillnottrackingconsistentwithchannelsP-945andP-949.FurtherinvestigationwasconductedonFebruary2,1994,toidentifyiftherecouldbeanypossiblemechanicaland/orelectricalproblemswithP-947.OnFebruary2,1994,atapproximately1612EST,withthereactoratapproximately989.steadystatereactorpower,ControlRoomoperatorsdeclaredchannelP-947inoperable.Theaffectedbistableswereplacedinthetrippedcondition.ToverifytheoperabilityoftheredundantCNMTpressurechannels,theoperatorsthencausedasmallchangeinCNMTpressurebydepressurizingCNMTperoperatingprocedure0-11,"ControlofMiniPurgeExhaustValvesWhileDepressurizingContainment".I&Cpersonnelmonitoredtest,pointsforCNMTpressurechannelsP-945,P-947,P-948,andP-949withadigitalmultimeter.Duringthisdepressurization,atapproximately1642EST,twochannels(P-947andP-948)didnotshowanyresponsetothesmallchangeinCNMTpressure.TheControlRoomoperatorsformallydeclaredP-948inoperableatapproximately1658EST.TheaffectedbistableswereplacedinthetrippedconditionperemergencyrestorationprocedureER-INST.1,"ReactorProtectionBistableDefeatAfterInstrumentationLoopFailure".P-947andP-948senseCNMTpressureviaacommonline(CNMTPenetration203A).ACNMTentrywasmadetoverifythatthissensinglineforPT-947andPT-948,(Pen.203A)wasnotmechanicallyblocked.Pen.203Awasvisuallyverifiednottobeexternallyobstructed.Thevalvelineupsforthepressuretransmitters(PT-947andPT-948)wereverifiedtobecorrect.HRCFORH366A(5-92)

NRCFORM366A(5.92)US.NUCLEARREGULATORYCOHIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYOMBNO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIONREQUEST:50.0HRS.FORWARDCOMMENTSREGARDIHGBURDENESTIMATETOTHEINFORMATIONAHDRECORDSMANAGEMENTBRANCH(MNBB7714),U.S.NUCLEARREGUI.ATORYCOMMISSION,WASHINGTON,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(31/0.0104),OFFICEOFMANAGEMENTANDBUDGETWASHINGTONDC20503.FACILITYlOWE1R.E.GinnaNuclearPowerPlantDOCKETNUMBER205000244LERNUMBER6YEARSEQUENTIAL94-002REVISION01PAGE34OFm!4TEXT(Ifmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)OnFebruary3,1994,aworkpackagefortroubleshootingandrepairoftheCNMTpenetrationlinewasprepared.ACNMTentrywasmadeandPen.203Awaspressurizedtothirty(30)poundspersquareinchesaboveatmosphericpressure(PSIG),usingsurveillancetestprocedurePTT-23.17B,"ContainmentIsolationValveLeakRateTestingContainmentPressureTransmittersPT-947andPT-948Pen203A".PT-947andPT-948didnotrespondtothispressure,whichindicatedablockageinthepipingforPen.203Aorinthecommoninstrumenttubingline.Backflushingwithone-hundred-twenty(120)PSIGairsupplytocleartheblockagewasunsuccessful.Pen.203AwasisolatedinsideCNMTtoprovidedoublebarrierisolationforCNMTintegrity.TheinstrumenttubingwasdisconnectedoutsideCNMT.Theinstrumenttubingwasfoundtocontainwater,butthiswaterwasnot'hesourceoftheblockage.The1/2inchcarbonsteeltubingforPen.203Awasfoundtobemechanicallyblockedwithathicksludge.Theblockagewasremoved.Thetubingwasreassembledandpreparationsweremadetotestthetubing.OnFebruary3,1994,atapproximately2207EST,Pen.203AwasdeclaredinoperabletoperformrequiredAppendixJtesting.TheLimitingConditionforOperation(LCO)forTechnicalSpecification(TS)3.6.3.1.wasentered.Pen.203AwastestedinaccordancewithsurveillancetestprocedurePTT-23.17B,"ContainmentIsolationValveLeakRateTestingContainmentPressureTransmittersPT-947andPT-948Pen203A".ItwasdocumentedinPTT-23.17BthatPT-947andPT-948nowaccuratelyrespondedwhenthepenetrationwaspressurizedto60PSIG.PTT-23.17Bwassuccessfullycompletedatapproximately2336ESTandPen.203Awasdeclaredoperableatapproximately2340EST.OnFebruary4,1994,atapproximately0007EST,P-947wasdeclaredoperable.ThetransmitterandrackcalibrationprocedureforchannelP-948wasperformedlaterinthedayonFebruary4,andP-948wasdeclaredoperableatapproximately1536ESTonFebruary4,1994.HRCFORM366A(5-92)

NRCFORM366A(5-92)US.NUCLEARREGULATORYCQOIISSIOHLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBYQUINO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIONREQUEST:50.0HRS.FOR'WARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMAHAGEMENTBRANCH(MHBB7714),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555-0001,ANDTOTHEPAPERWORKREDUCTIONPROJECT(3150-0104),OFFICEOFMANAGEMENTAHDBUDGETWASHINGTONDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNUMBER205000244YEAR94-002--01LERNUMBER6SEQUENTIALREVISIONPAGE3TEXT(Ifmorespaceisrequired,useadditionatcopiesofHRCForm366A)(17)'AA'~L':::LnIHT.:::i:,.yz',assana!::,::@hanna1s,.'::.~fluhy'Pr()%i'III,~e'ly.',-.:.jD'7,;59.;-'::-EST,';TTi%h':::thV':'1anP%n":"6>a"'>co'1d~shoactosn!;::,:oonaI:SLosn:l.:::,:::;aectit9,',onaI..'.",cc'--'"':el:'"::F:.:!"=:"'-,.~HRCFORM366A(5-92)

NRCFORH366A(5-92)U.S.NUCLEARREGULATORYC(NIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYQGINO.3150-0104EXPIRES5/31/95ESTINATEDBURDENPERRESPOHSETOCOHPLYWITHTHISIHFORMATIOHCOLLECTIONREQUEST:50.0HRS.FORWARDCOHHENTSREGARDING'BURDENESTIHATETOTHEINFORHATIOHANDRECORDSHANAGEHENTBRANCH(HNBB7714)aUSTNUCLEARREGULATORYCOHHISSIOHaWASHINGTON,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(3150-0104),OFFICEOFMANAGEMENTANDBUDGETWASHINGTONDC20503.FACILITYNAHE1R.E.GinnaNuclearPowerPlantDOCKETNIMBER205000244LERNUMBER6YEARSEQUENTIAL94-002--REVISIOH01PAGE3LR~:<MTEXT(Ifmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)C.INOPERABLESTRUCTURESgCOMPONENTSgORSYSTEMSTHATCONTRIBUTEDTOTHEEVENT:NoneD~OTHERSYSTEMSORSECONDARYFUNCTIONSAFFECTED:EngineeredSafetyFeaturesthatrelyonCNMTpressureinputsareSafetyInjectionActuation(SI),SteamLineIsolation,andContainmentSprayActuation(CNMTSpray).NoneofthesefeatureswasaffectedbytheinoperabilityofP-947andP-948,becauseatnotime,fromJune24,1992,toFebruary4,1994,wasCNMTpressureatorneartheactuationsetpoints(4PSIGforSI,18PSIGforSteamLineIsolation,and28PSIGforCNMTSpray).Duringthisperiod,theredundantchannels(forP-947thechannelsareP-945andP-949;forP-948thechannelsareP-946andP-950)wereinserviceandwerenottakenoutofserviceunlesstheaffectedhistahleswereplacedinthetripped""'"i,::,:::::::i..":...:.',9,,:',:,.%,::.:i!:-.'.I'P,.::.',":,':.'.:,,:.:%:::::",:::::".:'",:,ll<:::,:i!i~>','-'-.".i'ecan>+<-".::!><'i'"happ:.>'l'METHODOFDISCOVERY:ThiseventwasfirstidentifiedduetotheastuteobservationofaControlRoomoperatoronJanuary20,1994,whoquestionedaslightdifferenceinindicationsforCNMTpressure.ThesmalldeviationbetweenredundantchannelswaswithinthetoleranceofMainControlBoardinstrumentationchannelchecks.ThemonthlyChannelFunctionalTestsandannualChannelCalibrationsassociatedwiththesechannels(asrequiredbyTSTable4.1-1forunitsf17andf25)didnotdetecttheobstructedtubinglineduetothelocationoftheobstruction.ThesludgewaslocatedbetweenCNMTandtherootisolationvalvesforPT-947andPT-948.Theserootisolationvalvesareclosedduringperformanceofthenecessarytestsandcalibrations,inordertopressurizethevolumebetweenthevalveandthepressuretransmitter.ThismethodoftestingisconsistentwiththedefinitionofChannelFunctionalTesting,asdefinedinTS1.7e3~a.ThefactthatthiseventaffectedbothchannelsP-947andP-948wasidentifiedasaresultoftheinvestigationsperformedbyI&CpersonnelonFebruary2,1994.HRCFORH366A(592)

NRCFORM366A(592)U.SNUCLEARREGULATORYCQOIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYQIBNO.'150-0104EXPIRES5/31/95ESTIMATEDBURDEHPERRESPOHSETOCOMPLYMITHTHISINFORMATIONCOLLECTIONREGUEST:50.0MRS.FORHARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMANAGEMENTBRAHCH(MNBB7714),U.S.NUCLEARREGULATORYCOMMISSION,NASHINGTOH,DC20555-0001ANDTOTHEPAPERIIORKREDUCTIONPROJECT(3140-0104),OFFICEOFMANAGEMENTANDBUDGETIlASHINGTONDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNINBER20500024494--002--01LERHINBER6YEARSEQUENTIALREVISIGHPAGE3,:;O~P:"jX4TEXT(Ifmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)AmoredetailedreviewofthearchivedPPCSrecordsofCNMTpressureconcludedthatchannelP-947hadnotrespondedtochangesinCNMTpressuresinceJune24,1992,beginningatapproximately1500EDST.NotethatwhileCNMTpressurechannelP-947ismonitoredbythePPCS,channelP-948isnot.Inaddition,PI-948(andalsoPI-946andPI-950)haveascaleof10to200PSIA(absolutepressure).Bycomparison,PI-947(andalsoPI-945andPI-949)haveascaleof0to60PSIG.ItisassumedthatP-948hadnotrespondedtochangesinCNMTpressureforthesameamountoftimeasP-947.F.OPERATORACTION:TheControlRoomoperatorsobservedthatthePI-947readingwasinconsistentonJanuary20,1994,andinitiatedaMWR/TR.AfterbothchannelsP-947andP-948werediscoveredtobeinoperable,theControlRoomoperatorsperformedemergencyrestorationprocedureER-INST.1andplacedtheaffectedbistablesinthetrippedcondition.Subsequently,theControlRoomoperatorsensuredthathighersupervisionandtheNRCResidentInspectorhadbeennotifiedofthisevent.G.SAFETYSYSTEMRESPONSES:NoneIII.CAUSEOFEVENTA.IMMEDIATECAUSE:TheimmediatecauseoftheeventwasthefailureofP-947andP-948torespondtochangesinCNMTpressureduetoobstructionofthecommonpressuresensingline.NRCFORM366A(5-92)

KRCFORM366A(5.92)U.S.NUCLEARREGULATORYCQIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBY(HUINO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISIHFORMATIONCOLLECTIONREQUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIHATETOTHEINFORMATIONANDRECORDSMANAGEMENTBRANCH(MHBB7714),U.STNUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555-0001,AHDTOTHEPAPERWORKREDUCTIONPROJECT(31500104),OFFICEOFMAHAGEMEHTANDBUDGETWASHINGTONDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNWBER2YEAR05000244g4LERHINBER6SEQUENTIAL--002--REVISION01PAGE3TEXT(Ifmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)B.INTERMEDIATECAUSE:C.TheintermediatecauseoftheobstructionofthecommonpressuresensinglineatPen.203Awasabuildupofcorrosionproductsinthisline,whichis1/2inchOD,0.065inchwallthickness,carbonsteeltubing.Thesecorrosionproductswerevisuallyexaminedandfoundtobereddishbrown/blackincolor,visuallyreSemblingiranOXideSCale.ThiiS!h'in!idpe!~Cia:;:,":':,,:CrctrrcwancaprdciiCtS"""""""."e"4'"'~'"""'i""'i"""ROOTCAUSE:Theunderlyingcauseofthemso,,~t:-:,"'ii}h:::",ii-:':::,I:::::-ei'k!:configuration.I&Cpersonnelhavecali.'b'ratedthesetransmitterswithawater-filleddeadweighttesterformanyyears.Theconfigurationofthetransmitterandsensinglinefi+r~'Pe'ri:".",y-,20)'Apreventedthedrainageofallthewateraftercalibsraf:ion.Afterthetransmitterwasunisolatedaspartofthecalibrationprocess,thetrappedwatertraveleddowntothelowportionofthesensinglineP!:.:;'::!whereityataje'djunJ'i~1!,PV'aPoratig,",nr".:.,"::P(ejrCmtjngfQC1HRCFORM366A(5-92)

NRCFORM366A(5-92)U.S.NUCLEARREGULATORYCQIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYMSNO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIOHREQUEST:50.0HRS~FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMANAGEMENTBRANCH(MHBB7714),U.S.NUCLEARREGULATORYCOMMISSIONSWASHINGTOH,DC205550001ANDTOTHEPAPERWORKREDUCTIONPROJECT(31800104),OFFICEOFMANAGEMENTANDBUDGETWASHINGTONDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNINBER20500024494--002--01LERNUMBER6YEARSEQUENTIALREVISIONPAGE3/god!1'4'EXT(Ifmorespaceisrequired,useadditionalcopiesotNRCForm366A)(17)Stagnantwaterhaeremainedinthecarbonsteelsensinq~ee5"Ape".LCD~!Pj~T}..-:-.,:20gh"forasubstantialperiodoftimee'fter'.,',":;::.:e'i'4~3-:i~bditi'OiP.Unctereach~th'i'i'5conditions,significant"corrosionofthecarbonsteelmaterialoeeuiii'5.,Thecorrosionproduct,hydratedironoxide(commonrust)isvoluminous,occupyingmanytimesthevolumeofthemateriallosttothecorrosionprocess.Sufficientcorrosionproductaccumulatedtoblockthesensinglinetubing,resultingintheinoperabilityofP-947andP-948.IV.ANALYSISOFEVENTThiseventisreportableinaccordancewith10CFR50.73,LicenseeEventReportSystem,item(a)(2)(i)(B),whichrequiresareportof,"Anyoperationorconditionprohibitedbytheplant'sTechnicalSpecifications".CNMTpressurechannelsP-947andP-948wereinoperableforaconsiderablelengthoftime,contrO'Vg5~c))::,th'i".~~reqYi';x".ime~nt,-ofTSTable3.5-2,unitsg1.b.,2.b.,and5".c.OperaTionintlii.sconditionsinceJune24,1992isaconditionprohibitedbyTS.Anassessmentwasperformedconsideringboththesafetyconsequencesandimplicationsofthisevent.TheresultsofthisassessmentarethattherewerenooperationalorsafetyconsequencesorimplicationsattributedtotheinoperabilityofP-947andP-948because:oAreviewofplanthistoryandpreventivemaintenancehistoryfileshasshownthattheredundantCNMTpressurechannels(P-945,P-946,P-949,andP-950)havebeeneitheroperableorplacedintheconservativetrippedstatefromtheEventdtetotheDiscoverydate~@'exieptl:,'go~rgajproYYimate'3/<i,njn'ei(,,i)g':i,:i,oAreviewofPPCSdatahasshownthat.theredundantpressurechannelshaverespondedtopressurizationofthesensinglinesandpressurechangesinCNMT.9gsg'a'1;:@Tl'SjiCti~()n8hah~>8iiS'pe'.04M'itothesamefailuremodeasP-947andP-948.~Wi"'""'"RvkN4K6MHRCFORM366A(5-92)

NRCFORH366A(5.92)U.S.NUCLEARREGULATORYCQOlISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBY(NBNO.3150-0104EXPIRES5/31/95ESTIHATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIONREQUEST:50.0HRS.FORWARDCOHMEHTSREGARDINGBURDENESTIHATETOTHEINFORMATIONAHDRECORDSHANAGEHEHTBRANCH(HHBB7714),U.S.NUCLEARREGULATORYCOMMISSIONSWASHIHGTOH,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(31/0.0104),OFFICEOFMANAGEMENTANDBUDGETWASHINGTONDC20503.FACILITYNAME1DOCKETHINBER2LERHINBER6SEQUENTIALREVISIONPAGE3R.E.GinnaNuclearPowerPlant0500024494--00200Al9843,4TEXT(lfmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)00The2outof3logic(2/3)requiredforactuationofSIwasreducedtoa2/2logicwiththeinoperabilityofP-947.ThusSIactuationfromh&phCNMTpressure(4PSIG)wouldhaveoccurredasassumedinthedesignbasis.ThediverseactuationcircuitryforSIhasthreeadditionalmeansofactuation(steamgeneratorlowsteampressure,pressurizerlowpressure,andManual).NoneofthesediversemeanswasaffectedbytheinoperabilityofP-947.0The2/3logicrequiredforSteamLineIsolationactuationwasreducedtoa2/2logicwiththeinoperabilityofP-948.pressure(18PSIG)wouldhaveoccurredasassumedinthedesignbasis.0ThediverseactuationcircuitryforSteamLineIsolationhasthreeadditionalmeansofactuation(hi-histeamflowwithsafetyinjection,histeamflowand2/4lowTavgwithsafetyinjection,andManual).NoneofthesediversemeanswasaffectedbytheinoperabilityofP-948.0The2/3plus2/3logicrequiredforCNMTSprayactuationwasreducedtoa2/2plus2/2logicwiththeinoperabilityofp-947ahdp-948K~!"exaej%i:,:,:::,ga~Tapprpkiiaats1p~in'i'iie'-.::+9),"secchdsIYe9hCHI4Tpressure(28PSIG)wouldhaveoccurredasassumedinthedesignbasis.0ThealternateactuationcircuitryforCNMTSpray(Manual)wasnotaffectedbytheinoperabilityofP-947andP-948.NRCFORM366A(592)

NRCFORM366A(5-92)U.S.NUCLEARREGULATORYCQIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATZONAPPROVEDBTQU!NO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPOHSETOCOMPLYWITHTHISINFORMATIONCOLLECTIOHREQUEST:50.0HRS.FORWARDCOMMENTSREGARDIHGBURDENESTIMATETOTHEINFORMATIONAHDRECORDSMANAGEMENTBRANCH(MHBB7714),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555-0001AHDTOTHEPAPERWORKREDUCTIONPROJECT(3140-0104),OFFICEOFMANAGEMENTANDBUDGETWASHINGTONDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNIHIBER205000244LERNUMBER6YEARSEQUENTIAL94-002--REVISION01PAGE3TEXT(Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A)(17)On::;:!OMT~iFi"-"'::(@i~="lI""i"">I.""8:i"'i="='""c:-"ss""'"bi"i'.;!N":ii.n'<""'n'nexgxzneg'an'@OS:::;:P-::,",94T'.:,,~HRCFORM366A(5-92)

HRCFORM366A(5-92)U.S.NUCLEARREGULATORYCOHISSIOHLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYQQHO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYMITHTHISINFORMATIONCOLLECTIONREOUEST:50.0HRS.FORNARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMANAGEMENTBRANCH(HNBB7714),U.S.NUCLEARREGULATORYCOMMISSIDH,MASHIHGTOH,DC20555-0001AHDTOTHEPAPERNORKREDUCTIONPROJECT(3140-0104),OFFICEOFMANAGEMENTANDBUDGETllASHINGTONDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETHNBER205000244YEAR94LERNUMBER6SEQUENTIAL--002REVISION-01PAGE3TEXT(Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A)(17)'1c)88~@>>.0$'i'off'8Xt'e'.spowexv4c'oiNckldeAt@%73,"t'b~4h8'~lacctdi@nt';ll!'i'-,!!i!Ill,,!!!i!!...ii!,!!i,'::,.!ll...!!P,,ilia!!'l'i'i!ii!i'!,:tile~>>!i!:"'asedontheabove,itcanbeconcludedthatthepublic'shealthandsafetywasassuredatalltimes.V.CORRECTIVEACTIONA.ACTIONTAKENTORETURNAFFECTEDSYSTEMSTOPRE-EVENTNORMALSTATUSoTheironoxidescalewasremovedfromtheobstructedpenetrationsensinglineandP-947andP-948wererestoredtooperablestatus.oTheotherchannelsthatmonitorCNMTpressurewereverifiedtorespondtosmallchangesinCNMTpressure.HRCFORH366A(5-92)

NRCFORM366A(5-92)U.S.NUCLEARREGULATORYCQIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBY(HNINO;3150-0104EXPIRES5/31/95ESTIMATEDBURDEHPERRESPONSETOCOMPLYIIITHTHISINFORMATIONCOLLECTIOHREQUEST:50.0HRS.FORllARDCOMMENTSREGARDIHGBURDENESTIMATETOTHEIHFORMATIOHANDRECORDSMANAGEMENTBRANCH(MHBB7714)4USTNUCLEARREGULATORYCOMMISSION?llASHINGTON,DC20555-0001ANDTOTHEPAPERNORKREDUCTIONPROJECT(3110-0104),OFFICEOFMANAGEMENTAHDBUDGETWASHINGTONDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNIMBER20500024494--002--01LERNUMBER6'YEARSEQUENTIALREVISIONPAGE3TEXT(Ifmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)B.ACTIONTAKENORPLANNEDTOPREVENTRECURRENCE:oPPCScomputerpointsforCNMTpressurewillbearchiveddailyuntilthe1994refuelingoutagetoverifychanneloperability.pl?CSScoa?putana;:-":;rior'ntsi'::fur,C,H::,,:MTSpr'sssurrsiieereoThesensinglinesforallCNMTpressurechannelswillbeinspectedandcleanedoutduringthe1994refuelingoutage.oThemethodofcalibrationoftheCNMTpressuretransmittershasbeenchangedtousegas(insteadofwater)asthetest...e?sas4?999??an?~~i..."vmmu?m,.znSSrr....",??4;49?S?'as.ye.rate....,44rs"',y;4'?w'ia4ssSSS<ccs'?9~'rRmedium.a.'ipse',~i',.e',vase'cIj',pros'cveau'r'ea",s',::.';gPreVpht;i'TIE+'EiI'cui',.:renice;.:IoTestingthesecontainmentpenetrationshasbeenenhancedtoincludeformaldocumentationofpressurechannelresponse.mHRCFORM366A(5-92)

NRCFORM366A(5-92)U.S.NUCLEARREGULATORYCQIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYIHIBNO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYNITHTHISINFORMATIONCOLLECTIONREQUEST:50.0HRS.FORMARDCOMHEHTSREGARDINGBURDENESTIMATETOTHEINFORMATIOHANDRECORDSMANAGEMENTBRANCH(MNBB7714),U.S.NUCLEARREGULATORYCOMMISSION,llASHIHGTOH,DC20555-0001AHDTOTHEPAPERIIORKREDUCTIONPROJECT(31400104),OFFICEOFMANAGEMENTAHDBUDGETNASHIHGTOHDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETHWBER2YEAR0500024494LERNUMBER6SEQUENTIAL-002REVISION01PAGE3~~"~":"'~F~>"4TEXT(Ifmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)VI.ADDITIONALINFORMATIONA.FAILEDCOMPONENTS:Therewerenofailedcomponents.Theobstructedsensinglineis1/2inchOD,0.065inchwallthickness,carbonsteeltubing.Informationaboutthevendorandmanufacturerisnotrelevanttothisevent.B.PREVIOUSLERsONSIMILAREVENTS:AsimilarLEReventhistoricalsearchwasconductedwiththefollowingresults:LER92-003wasalsoaneventcausedbyanobstructedpressuresensingline.However,theobstructionwascausedbybuildupofsludgefromnormalimpuritiesintheprocessfluid(feedwater).TheobstructionreferredtoinLER94-002wascausedbycorrosionfromtheinteractionofthetestmediumandthesensinglinematerials.C.SPECIALCOMMENTS:NoneHRCFORM366A(5-92)