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{{#Wiki_filter:ACCELERATEDDISTRIBUTIONDEMOblSj.RA'i'LON5YdlelvittREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9405100227DOC.DATE:94/05/06NOTARIZED:NOFACIL:50-244RobertEmmetGinnaNuclearPlant,Unit1,RochesterGAUTH.NAMEAUTHORAFFILIATIONST.MARTIN,J.T.RochesterGas&ElectricCorp.MECREDY,R.C.RochesterGas&ElectricCorp.RECIP.NAMERECIPIENTAFFILIATIONDOCKET05000244
{{#Wiki_filter:ACCELERATED DISTRIBUTION DEMOblSj.RA'i'LON 5YdlelvittREGULATORY INFORMATION DISTRIBUTION SYSTEM(RIDS)ACCESSION NBR:9405100227 DOC.DATE:
94/05/06NOTARIZED:
NOFACIL:50-244 RobertEmmetGinnaNuclearPlant,Unit1,Rochester GAUTH.NAMEAUTHORAFFILIATION ST.MARTIN,J.T.
Rochester Gas&ElectricCorp.MECREDY,R.C.
Rochester Gas&ElectricCorp.RECIP.NAME RECIPIENT AFFILIATION DOCKET05000244


==SUBJECT:==
==SUBJECT:==
LER94-002-02:on940202,ContainmentPressurechannelsP-947&P-948wereinoperable.Causedbywaterbeingtrappedinalowpointofline.Correctiveaction:ironoxidescalewasremoved&sensinglinewererestoredchannels.W/940506ltr.DISTRIBUTIONCODE:IE22TCOPIESRECEIVEDLTR(ENCLLSIZE:TITLE:50.73/50.9LicenseeEventReport(LER),IncidentRpt,etc.NOTES:LicenseExpdateinaccordancewith10CFR2,2.109(9/19/72).DA05000244DRECIPIENTIDCODE/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/j3SGh.SPLBBEGFILE02N1~FLEOlLSTLOBBYWARDNSICMURPHY,G.ANUDOCSFULLTXTCOPIESLTTRENCL11111111111111111111=1111DR~ygoqzg(>Lop.DNOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.20079)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!DDFULLTEXTCONVERSIONREQUIREDTOTALNUMBEROFCOPIESREQUIRED:LTTR27ENCL27 cROCHESTERGASANDELECTRICCORPORATION89EASTAVENUE,Nr~rc'Ix51accROCHESTERN.Y.14649-0001ROBERTC.h<ECREDYVicePreridentCrone,NuclcrrrProductionTELEottONEaBEaCODEPre546.2700Maj;;:6,1994U.S.NuclearRegulatoryCommissionDocumentControlDeskAttn:AllenR.JohnsonProjectDirectorateI-3Washington,D.C.20555
LER94-002-02:on 940202,Containment PressurechannelsP-947&P-948wereinoperable.
Causedbywaterbeingtrappedinalowpointofline.Corrective action:iron oxidescalewasremoved&sensinglinewererestoredchannels.W/940506 ltr.DISTRIBUTION CODE:IE22TCOPIESRECEIVEDLTR(ENCLLSIZE:TITLE:50.73/50.9 LicenseeEventReport(LER),IncidentRpt,etc.NOTES:License Expdateinaccordance with10CFR2,2.109(9/19/72).
DA05000244DRECIPIENT IDCODE/NAME PD1-3PDINTERNAL:
AEOD/DOAAEOD/ROAB/DS PNRR/DE/EMEB NRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DRSS/PRPB NRR/DSSA/SRXB RES/DSIR/EIB EXTERNAL:
EG&GBRYCE,J.H NRCPDRNSICPOORE,W.COPIESLTTRENCL111122111111221111221111RECIPIENT IDCODE/NAME JOHNSON,A AEOD/DSP/TPAB NRR/DE/EELB NRR/DORS/OEAB NRR/DRCH/HICB NRR/DRIL/RPEB NRR/j3SGh.
SPLBBEGFILE02N1~FLEOlLSTLOBBYWARDNSICMURPHY,G.A NUDOCSFULLTXTCOPIESLTTRENCL11111111111111111111=1111DR~ygoqzg(>Lop.DNOTETOALL"RIDS"RECIPIENTS:
PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.20079)TOELIMINATE YOURNAMEFROMDISTRIBUTION LISTSFORDOCUMENTS YOUDON'TNEED!DDFULLTEXTCONVERSION REQUIREDTOTALNUMBEROFCOPIESREQUIRED:
LTTR27ENCL27 cROCHESTER GASANDELECTRICCORPORATION 89EASTAVENUE,Nr~rc'Ix51accROCHESTER N.Y.14649-0001 ROBERTC.h<ECREDYVicePrerident Crone,NuclcrrrProduction TELEottONE aBEaCODEPre546.2700Maj;;:6,1994U.S.NuclearRegulatory Commission DocumentControlDeskAttn:AllenR.JohnsonProjectDirectorate I-3Washington, D.C.20555


==Subject:==
==Subject:==
LER94-M2,Re@)sigil'.":,.:,':2>ContainmentPressureTransmittersInoperable,DuetoBlockageofSensingLinebyCorrosionProducts,CausesaConditionProhibitedbyTechnicalSpecificationsR.E.GinnaNuclearPowerPlantDocketNo.50-244Inaccordancewith10CFR50.73,LicenseeEventReportSystem,item(a)(2)(i)(B),whichrequiresareportof,"Anyoperationorconditionprohibitedbytheplant'sTechnicalSpecifications",theattachedLicenseeEventReportLER94-002,Revisio'j',':;::,::,':2::;::isherebyr'nMCeMr'rnenwsubmitted.4'c%.(rerggp~pr:','@c.r++r4rexggj:,'@ANxenrnr~~~~rrrccctrcrrnrrn&rrrrruxrrrrCCc@crnrS~xNxa&4+%re'r.4.4>-"~~~."r4n~r&AxcAN~CeMrtiii'inde'd~i'ii"'Oiisgiiiisi~ii>Thiseventhasinnowayaffectedthepublic'shealthandsafety.Veryrulyyours,obertC.Mecryxc:U.S.NuclearRegulatoryCommissionRegionI475AllendaleRoadKingofPrussia,PA19406GinnaSeniorResidentInspector~fcr;"rr4Q'r,"l,I<pcJ5j)4zd7g~lzsDf9405100227940506PDRADOCK050002448PDRg>PP NRCFORM366(5-92)U.S.NUCLEARREGULATORYCQOIISSIOHPROVEDBYQlgNO.3150-0104EXPIRES5/31/95LICENSEEEVENTREPORT(LER)(Seereverseforrequirednumberofdigits/charactersforeachblock)ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIONREQUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMANAGEMENTBRANCH(MNBB7714),U.STNUCLEARREGULATORYCOHHISSION,l}ASHINGIOH,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(31/0-0104),OFFICEOFMANAGEMENTANDBUDGETWASHINGTONDC20503.FAGILITYNAME(1)R.E~GinnaNuclearPowerPlantDOCKETHQlBER(2)05000244PAGE(3)1OF14iTITLE(4)ContairN}entPressureTransmittersInoperable,DuetoBlockageofSensingLinebyCorrosionProducts,CausesaConditionProhibitedbyTechnicalSpecificationsMONTH02DAYYEAR0294EVENTDATE5YEAR94LERNllBER6SEQUENTIALNUMBERREVISIONNUHBER--002---'02::4'ac'ONTHDAYYEARREPORTDATE7FACILITYNAMEDOCKETNUMBERFACILITYNAHEDOCKETNUHBEROTHERFACILITIESINVOLVED8OPERATINGMQ)E(9)POWERLEVEL(10)N09820.402(b)20.405(a)(1)(i)20.405(c)50.36(c)(1)50.73(a)(2)(iv)50.73(a)(2)(v)73.71(b)73.71(c)20.405(a)(1)(ii)50.36(c)(2)20.405(a)(1)(iii)X50.73(a)(2)(i)20'05(a)(1)(iv)20.405(a)(1)(v)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)50'3(a)(2)(x)OTHER(SpecifyinAbstractbelowandinText,NRCForm366ATHISREPORTISSUBHITTEDPURSUANTTOTHEREQUIREMENTSOF10CFR:Checkoneormore11NAMEJohnT.St.Hartin-Director,OperatingExperienceTELEPHONENUMBER(IncludeAreaCode)(315)524-4446CQlPLETEONELINEFOREACHCQlPOHEHTFAILUREDESCRIBEDINTHISREPORT'13CAUSESYSTEMCOHPONENTMANUFACTURERREPORTABLETONPRDSCAUSESYSTEHCOMPONENTMANUFACTURERREPORTABLETONPRDSSUPPLEMENTALREPORTEXPECTED14YES(Ifyes,completeEXPECTEDSUBHISSIONDATE).XNOEXPECTEDSUBHISSIONDATE(15)HONTHDAYYEARABSTRACT(Limitto1400spaces,i.e.,approximately15single-spacedtypewrittentines)(16)OnFebruary2,1994,atapproximately1642EST,withthereactoratapproximately989steadystatepower,ControlRoomoperatorsdeterminedthatContainment.PressurechannelsP-947andP-948wereinoperable.Basedonpost-eventreviewofcomputerdata,thisconditionwasinviolationofTechnicalSpecificationTable3.5-2ActionStatements.Immediatecorrectiveactionwastodefeattheinoperablechannelsbyplacingtheaffectedbistablesinthetrippedcondition.TheunderlyingcauseoftheeventwasanobstructioninthecommoncontainmentpressuresensinglineforP947a-nilP-948Fi'i<1'6'su''ltiri&gjfro'm4'..:ll"::'"9!i-:s.:*-ll':-'oi':,,:::!!P!:::,,::!!W!ii,:,".:::::ii':':-"-i!ilia:::'"4!ii'!E!i'",:-"'"i"'ll'i-"I'i:-*'-'.ilia',.'i""'i'i'i!ii"""-"::i'i'i::iiiiiiiiilia:,**i!'.Correctiveactionwastakentocleartheobstructionfromtheaffectedtubing,leaktestthepenetrationpipingandtransmittertubing,andverifytheproperoperationofP-947andP-948.CorrectiveactiontoprecluderepetitionisoutlinedinSectionV(B).iNRCFORH366(592)
LER94-M2,Re@)sigil'.":,.:,':2>
NRCFORM366A(5-92)U.SNUCLEARREGULATORYCOWIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYOMBNO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIONREGUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDEHESTIMATETOTHEINFORMATIONANDRECORDSMANAGEMEHTBRANCH(MHBB7714),U.S.NUCLEARREGULATORYCOMMISSION,'WASHINGTON,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(3140-0104),OFFICEOFMANAGEMENTANDBUDGETWASHINGTONDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNNER205000244LERNUMBER6YEARSEQUENTIAL94-002-REVISIONPAGE32OF>3''TEXT(Ifmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)PRE-EVENTPLANTCONDITIONS'heplantwasatapproximately98'teadystatereactorpowerwithnomajoractivitiesinprogress.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)
Containment PressureTransmitters Inoperable, DuetoBlockageofSensingLinebyCorrosion
NRCFORM366A(5-92)U.S.NUCLEARREGULATORYCAIIISSIONL1CENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYOMBNO.3150-0'104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIONREQUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMANAGEMENTBRANCH(MNBB7714),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(31400104),OFFICEOFMANAGEMENTAHDBUDGETWASHINGTONDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETHIER2YEAR0500024494LERHIHIBER6SEQUENTIAL-002--REVISIGH02PAGE33OF9!4'EXT(Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A)(17)B.EVENT:OnJanuary20,1994,ControlRoomoperatorsobservedthatoneMainControlBoardindicationforCNMTpressure,PI-947,wasreadingslightlylowerthantheothertwoindicators,PI-945andPI-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,withthereactoratapproximately98%steadystatereactorpower,ControlRoomoperatorsdeclaredchannel'P-947inoperable.Theaffectedbistableswereplacedinthetrippedcondition.ToverifytheoperabilityoftheredundantCNMTpressurechannels,theoperatorsthencausedasmallchangeinCNMTpressurebydepressurizingCNMTperoperatingprocedure0-11,"ControlofMiniPurgeExhaustValvesWhileDepressurizingContainment".I&CpersonnelmonitoredtestpointsforCNMTpressurechannelsP945gP947P948)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.HRCFORM366A(5-92)
: Products, CausesaCondition Prohibited byTechnical Specifications R.E.GinnaNuclearPowerPlantDocketNo.50-244Inaccordance with10CFR50.73,LicenseeEventReportSystem,item(a)(2)(i)(B),whichrequiresareportof,"Anyoperation orcondition prohibited bytheplant'sTechnical Specifications",
NRCFORM366A(5-92)U.s.NUcLEARREGULATDRYcQellssloNLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYOMBNO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIOHREQUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORMATIONAHDRECORDSMANAGEMENTBRAHCH(MNBB7714),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTOH,DC20555-0001AHDTOTHEPAPERWORKREDUCTIONPROJECT(31400104),OFFICEOFMANAGEMENTANDBUDGET'WASHIHGTONDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNUMBER205000244LERNINBER6YEARSEQUENTIAL94--002--REVISION02PAGE34OF.34TEXT(Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A)(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,butthiswaterwasnotthesourceoftheblockage.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(592)
theattachedLicenseeEventReportLER94-002,Revisio'j',':;::,::,':2::;::
NRCFORM366A(5-92)US.NUCLEARREGULATORYCQNIISSIOHLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYOMBNO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIOHCOLLECTIONREOUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMANAGEHENTBRANCH(MNBB7714),U.S.NUCLEARREGULATORYCOMMISSION>WASHIHGTOH,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(3140-0104),OFFICEOFMANAGEMENTANDBUDGETWASHINGTONDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNUMBER20500024494--00202LERNUMBER6'YEARSEOUENTIALREVISIONPAGE3'5!.:;:.'OFi:.;":;1'4TEXT(Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A)(17)~~>>>>>>>>>>mcgrr~~w~XCwO,.~~~X>>X><<>>~>~,a~,.eocevmOW~yXaxc..W>>>WZ>ya'',.m>>>,<~.>,s.>>~a~m~yg~.~>>>>>>~P,:i.,.':",:,,",.';,;:q,i'.;;,.:'f;P';'i';:;.'.-'.;.i:;;.'::;x':".,,~n;".'.;''aHRCFORM366A(5-92)  
isherebyr'nMCeMr'rnen wsubmitted.
4'c%.(rerggp~pr:
','@c.r++r4 rexggj:,'@AN xenrnr~~~~rrrccctrcrrnrrn&rrrrruxrrrrCCc@crnrS~xNxa&4
+%re'r.4.4>-"~~~."r4n~r&AxcAN~CeM rtiii'inde'd~i'ii"'Oiisgiiiisi~ii>
Thiseventhasinnowayaffectedthepublic'shealthandsafety.Veryrulyyours,obertC.Mecryxc:U.S.NuclearRegulatory Commission RegionI475Allendale RoadKingofPrussia,PA19406GinnaSeniorResidentInspector
~fcr;"rr4Q'r,"l,I<pcJ5j)4zd7g~lzsDf9405100227 940506PDRADOCK050002448PDRg>PP NRCFORM366(5-92)U.S.NUCLEARREGULATORY CQOIISSIOH PROVEDBYQlgNO.3150-0104 EXPIRES5/31/95LICENSEEEVENTREPORT(LER)(Seereverseforrequirednumberofdigits/characters foreachblock)ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRANCH(MNBB7714),U.STNUCLEARREGULATORY COHHISSION, l}ASHINGIOH, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(31/0-0104),
OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FAGILITYNAME(1)R.E~GinnaNuclearPowerPlantDOCKETHQlBER(2)05000244PAGE(3)1OF14iTITLE(4)ContairN}ent PressureTransmitters Inoperable, DuetoBlockageofSensingLinebyCorrosion
: Products, CausesaCondition Prohibited byTechnical Specifications MONTH02DAYYEAR0294EVENTDATE5YEAR94LERNllBER6SEQUENTIAL NUMBERREVISIONNUHBER--002---'02::4'ac'ONTH DAYYEARREPORTDATE7FACILITYNAMEDOCKETNUMBERFACILITYNAHEDOCKETNUHBEROTHERFACILITIES INVOLVED8OPERATING MQ)E(9)POWERLEVEL(10)N09820.402(b) 20.405(a)(1)(i)20.405(c) 50.36(c)(1) 50.73(a)(2)(iv) 50.73(a)(2)(v) 73.71(b)73.71(c)20.405(a)(1)(ii) 50.36(c)(2) 20.405(a)(1)(iii)
X50.73(a)(2)(i) 20'05(a)(1)(iv) 20.405(a)(1)(v) 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) 50'3(a)(2)(x)
OTHER(SpecifyinAbstractbelowandinText,NRCForm366ATHISREPORTISSUBHITTED PURSUANTTOTHEREQUIREMENTS OF10CFR:Checkoneormore11NAMEJohnT.St.Hartin-Director, Operating Experience TELEPHONE NUMBER(IncludeAreaCode)(315)524-4446CQlPLETEONELINEFOREACHCQlPOHEHT FAILUREDESCRIBED INTHISREPORT'13CAUSESYSTEMCOHPONENT MANUFACTURER REPORTABLE TONPRDSCAUSESYSTEHCOMPONENT MANUFACTURER REPORTABLE TONPRDSSUPPLEMENTAL REPORTEXPECTED14YES(Ifyes,completeEXPECTEDSUBHISSION DATE).XNOEXPECTEDSUBHISSIONDATE(15)HONTHDAYYEARABSTRACT(Limitto1400spaces,i.e.,approximately 15single-spaced typewritten tines)(16)OnFebruary2,1994,atapproximately 1642EST,withthereactoratapproximately 989steadystatepower,ControlRoomoperators determined thatContainment.
PressurechannelsP-947andP-948wereinoperable.
Basedonpost-event reviewofcomputerdata,thiscondition wasinviolation ofTechnical Specification Table3.5-2ActionStatements.
Immediate corrective actionwastodefeattheinoperable channelsbyplacingtheaffectedbistables inthetrippedcondition.
Theunderlying causeoftheeventwasanobstruction inthecommoncontainment pressuresensinglineforP947a-nilP-948Fi'i<1'6'su''ltiri&gjfro'm 4'..:ll"::
'"9!i-:s.:*-ll':-'oi':,,:::!!P!:::,,::!!W!ii,:,".:::::ii
':':-"-i!ilia::
:'"4!ii'!E!i'",:
-"'"i"'ll'i-
"I'i:-*'-'.ilia',.'i""'i' i'i!ii"""-"::i'i'i::ii iiiiiiilia:,**i!'.
Corrective actionwastakentocleartheobstruction fromtheaffectedtubing,leaktestthepenetration pipingandtransmitter tubing,andverifytheproperoperation ofP-947andP-948.Corrective actiontoprecluderepetition isoutlinedinSectionV(B).iNRCFORH366(592)
NRCFORM366A(5-92)U.SNUCLEARREGULATORY COWIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOMBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTION REGUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDEHESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMEHT BRANCH(MHBB7714),U.S.NUCLEARREGULATORY COMMISSION,
'WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),
OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNNER205000244LERNUMBER6YEARSEQUENTIAL 94-002-REVISIONPAGE32OF>3''TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)PRE-EVENT PLANTCONDITIONS'he plantwasatapproximately 98'teadystatereactorpowerwithnomajoractivities inprogress.
Instrument andControl(I&C)Department personnel wereinvestigating Containment PressurechannelP-947.Thisinvestigation wasinitiated byaMaintenance WorkRequest/TroubleReport(MWR/TR)writtenJanuary20,1994byControlRoomoperators becausetheMainControlBoardpressureindication forP-947(PI-947)wasobservedtobereadingslightlylowerthantheindication forContainment PressurechannelsP-945andP-949(PI-945andPI-949),whicharealsoontheMainControlBoard.II.DESCRIPTION OFEVENTA.DATESANDAPPROXIMATE TIMESOFMAJOROCCURRENCES:
oJune24,1992,1500EDST:Containment (CNMT)pressurechannelP-947outputindication startstobecomeinconsistent withchannelsP-945andP-949,asmonitored onthePlantProcessComputerSystem(PPCS).(Thisisbasedonpost-event reviewofarchiveddataonthePPCS.)Eventdateandtime.oJanuary20,1994:ControlRoomoperators submitMWR/TRonPI-947MainControlBoardindication.
oFebruary2,1994,1642EST:Discovery dateandtime.oFebruary4,1994,0007EST:Containment PressurechannelP-947isrestoredtooperablestatus.oFebruary4,1994,1536EST:Containment PressurechannelP-948isrestoredtooperablestatus.NRCFORM366A(5-92)
NRCFORM366A(5-92)U.S.NUCLEARREGULATORY CAIIISSION L1CENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOMBNO.3150-0'104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRANCH(MNBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(31400104),OFFICEOFMANAGEMENT AHDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETHIER2YEAR0500024494LERHIHIBER6SEQUENTIAL
-002--REVISIGH02PAGE33OF9!4'EXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)B.EVENT:OnJanuary20,1994,ControlRoomoperators observedthatoneMainControlBoardindication forCNMTpressure, PI-947,wasreadingslightlylowerthantheothertwoindicators, PI-945andPI-949.Theyinitiated aMWR/TR,forI&Cpersonnel toinvestigate thedifference inreadings.
OnJanuary21,I&Cperformed theannualcalibration ofthechannel.Thechannel(P-947)responded properlytoboththeelectronic checksandtoactualpressuresignalsinsertedintothetransmitter (PT-947).
Afterreviewing post-calibration trendingdataandarchivedPPCScomputertracesofCNMTpressure, I&CnoticedthatchannelP-947wasstillnottrackingconsistent withchannelsP-945andP-949.Furtherinvestigation wasconducted onFebruary2,1994,toidentifyiftherecouldbeanypossiblemechanical and/orelectrical problemswithP-947.OnFebruary2,1994,atapproximately 1612EST,withthereactoratapproximately 98%steadystatereactorpower,ControlRoomoperators declaredchannel'P-947inoperable.
Theaffectedbistables wereplacedinthetrippedcondition.
Toverifytheoperability oftheredundant CNMTpressurechannels, theoperators thencausedasmallchangeinCNMTpressurebydepressurizing CNMTperoperating procedure 0-11,"ControlofMiniPurgeExhaustValvesWhileDepressurizing Containment".
I&Cpersonnel monitored testpointsforCNMTpressurechannelsP945gP947P948)andP-949withadigitalmultimeter
.Duringthisdepressurization, atapproximately 1642EST,twochannels(P-947andP-948)didnotshowanyresponsetothesmallchangeinCNMTpressure.
TheControlRoomoperators formallydeclaredP-948inoperable atapproximately 1658EST.Theaffectedbistables wereplacedinthetrippedcondition peremergency restoration procedure ER-INST.1, "ReactorProtection BistableDefeatAfterInstrumentation LoopFailure".
P-947andP-948senseCNMTpressureviaacommonline(CNMTPenetration 203A).ACNMTentrywasmadetoverifythatthissensinglineforPT-947andPT-948,(Pen.203A)wasnotmechanically blocked.Pen.203Awasvisuallyverifiednottobeexternally obstructed.
Thevalvelineupsforthepressuretransmitters (PT-947andPT-948)wereverifiedtobecorrect.HRCFORM366A(5-92)
NRCFORM366A(5-92)U.s.NUcLEARREGULATDRY cQellssloNLICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOMBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTIOH REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION AHDRECORDSMANAGEMENT BRAHCH(MNBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTOH, DC20555-0001 AHDTOTHEPAPERWORK REDUCTION PROJECT(31400104),OFFICEOFMANAGEMENT ANDBUDGET'WASHIHGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNUMBER205000244LERNINBER6YEARSEQUENTIAL 94--002--REVISION02PAGE34OF.34TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)OnFebruary3,1994,aworkpackagefortroubleshooting andrepairoftheCNMTpenetration linewasprepared.
ACNMTentrywasmadeandPen.203Awaspressurized tothirty(30)poundspersquareinchesaboveatmospheric pressure(PSIG),usingsurveillance testprocedure PTT-23.17B, "Containment Isolation ValveLeakRateTestingContainment PressureTransmitters PT-947andPT-948Pen203A".PT-947andPT-948didnotrespondtothispressure, whichindicated ablockageinthepipingforPen.203Aorinthecommoninstrument tubingline.Backflushing withone-hundred-twenty (120)PSIGairsupplytocleartheblockagewasunsuccessful.
Pen.203AwasisolatedinsideCNMTtoprovidedoublebarrierisolation forCNMTintegrity.
Theinstrument tubingwasdisconnected outsideCNMT.Theinstrument tubingwasfoundtocontainwater,butthiswaterwasnotthesourceoftheblockage.
The1/2inchcarbonsteeltubingforPen.203Awasfoundtobemechanically blockedwithathicksludge.Theblockagewasremoved.Thetubingwasreassembled andpreparations weremadetotestthetubing.OnFebruary3,1994,atapproximately 2207EST,Pen.203Awasdeclaredinoperable toperformrequiredAppendixJtesting.TheLimitingCondition forOperation (LCO)forTechnical Specification (TS)3.6.3.1.wasentered.Pen.203Awastestedinaccordance withsurveillance testprocedure PTT-23.17B, "Containment Isolation ValveLeakRateTestingContainment PressureTransmitters PT-947andPT-948Pen203A".Itwasdocumented inPTT-23.17B thatPT-947andPT-948nowaccurately responded whenthepenetration waspressurized to60PSIG.PTT-23.17B wassuccessfully completed atapproximately 2336ESTandPen.203Awasdeclaredoperableatapproximately 2340EST.OnFebruary4,1994,atapproximately 0007EST,P-947wasdeclaredoperable.
Thetransmitter andrackcalibration procedure forchannelP-948wasperformed laterinthedayonFebruary4,andP-948wasdeclaredoperableatapproximately 1536ESTonFebruary4,1994.HRCFORM366A(592)
NRCFORM366A(5-92)US.NUCLEARREGULATORY CQNIISSIOH LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOMBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIOH COLLECTION REOUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEHENT BRANCH(MNBB7714),U.S.NUCLEARREGULATORY COMMISSION>
WASHIHGTOH, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),
OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNUMBER20500024494--00202LERNUMBER6'YEARSEOUENTIAL REVISIONPAGE3'5!.:;:.'OF i:.;":;1'4 TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)~~>>>>>>>>>>mcgrr~~w~XCwO,.~~~X>>X><<>>~>~,a~,.eocevmOW~yXaxc
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NRCFORM366A(5-92)U.S.NUCLEARREGULATORYCOMMISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYOMBNO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISIHFORMATIOHCOLLECTIOHREQUEST:50.0NRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORMATIONAHDRECORDSMANAGEMEHTBRANCH(MHBB7714),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(3140-0104),OFFICEOFMANAGEMENTANDBUDGETWASHINGTONDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNIMBER205000244LERNUMBER6YEARSEQUENTIAL94--002REVISION02PAGE3-."I."':.-'$~1'-'EXT(Ifmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)C~INOPERABLESTRUCTURESiCOMPONENTSIORSYSTEMSTHATCONTRIBUTEDTOTHEEVENT:NoneD.OTHERSYSTEMSORSECONDARYFUNCTIONSAFFECTED:are8,wasSI,)~946EngineeredSafetyFeaturesthatrelyonCNMTpressureinputsSafetyInjectionActuation(SI),SteamLineIsolation,andContainmentSprayActuation(CNMTSpray).NoneofthesefeatureswasaffectedbytheinoperabilityofP-947andP-94becauseatnotime,fromJune24,1992,toFebruary4,1994,CNMTpressureatorneartheactuationsetpoints(4PSIGfor18PSIGforSteamLineIsolation,and28PSIGforCNMTSprayDuringthisperiod,theredundantchannels(forP-947thechannelsareP-945andP-949;forP-948thechannelsareP-andP-950)wereinserviceandwerenottakenoutofserviceunlesstheaffectedbistableswereplacedinthetrippeddt""":,',,E".",X.;:.V',,';i>jj(i9'),.;!,'',CIP'.".'-':"::."":''-""'!!!""";,:;:conztz.onj~<e)('0'epr":.;:,,'"'xol-,';::.::.,'aper'axe%'ai'ei:jr,':,'',::'sine;>,"::(ji)i;:,:,:::se'concl''s':':on;"::"::9'8cQmb:e&#xc3;,'l:;:::.'04:.;::::;"':f99,2,:;":~E.METHODOFDISCOVERY:ThiseventwasfirstidentifiedduetotheastuteobservationofaControlRoomoperatoronJanuary20,1994,whoquestionedaslightdifferenceinindicationsforCNMTpressure.ThesmalldeviationbetweenredundantchannelswaswithinthetoleranceofMainControlBoardinstrumentationchannelchecks.ThemonthlyChannelFunctionalTestsandannualChannelCalibrationsassociatedwiththesechannels(asrequiredbyTSTable4.1-1forunits&#xb9;17and&#xb9;25)didnotdetecttheobstructedtubinglineduetothelocationoftheobstruction.ThesludgewaslocatedbetweenCNMTandtherootisolationvalvesforPT-947andPT-948.Theserootisolationvalvesareclosedduringperformanceofthenecessarytestsandcalibrations,inordertopressurizethevolumebetweenthevalveandthepressuretransmitter.ThismethodoftestingisconsistentwiththedefinitionofChannelFunctionalTesting,asdefinedinTS1t7~3~a~ThefactthatthiseventaffectedbothchannelsP-947andP-948wasidentifiedasaresultoftheinvestigationsperformedbyI&CpersonnelonFebruary2,1994.NRCFORM366A(5.92)
NRCFORM366A(5-92)U.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOMBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISIHFORMATIOH COLLECTIOH REQUEST:50.0NRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION AHDRECORDSMANAGEMEHT BRANCH(MHBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),
NRCFORH366A(5-92)U.S.NUCLEARREGULATORYCQHISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYOHBNO.3150-0104EXPIRES5/31/95ESTINATEDBURDENPERRESPONSETOCOHPLYWITHTHISINFORNATIONCOLLECTIONREQUEST:50.0HRS.FORWARDCOHHEHTSREGARDINGBURDENESTIHATETOTHEINFORHATIOHANDRECORDSHAHAGEHENTBRANCH(HNBB7714),U.S.NUCLEARREGULATORYCOHHISSION,WASHINGTON,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(3110.0104),OFFICEOFNANAGEHEHTANDBUDGETWASHINGTONDC20503.FACILITYNAHE1R.E.GinnaNuclearPowerPlantDOCKETHNBER205000244LERHIHIBER6YEARSEQUENTIAL94--002--REVISIOH02PAGE3TEXT(Ifmorespaceisrequired,useadditionalcoPIesofNRCForm366A)(17)Amoredetailedreview'ofthearchivedPPCSrecordsofCNMTpressureconcludedthatchannelP-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.NRCFORH366A(5.92)
OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNIMBER205000244LERNUMBER6YEARSEQUENTIAL 94--002REVISION02PAGE3-."I."':.-'$~1'-'EXT (Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)C~INOPERABLE STRUCTURES iCOMPONENTS IORSYSTEMSTHATCONTRIBUTEDTOTHEEVENT:NoneD.OTHERSYSTEMSORSECONDARY FUNCTIONS AFFECTED:
NRCFORM366A(5-92)U.S.NUCLEARREGULATORYCO}IIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYQUINO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIONREQUEST:50.0HRS.FORWARDCOMMENTSREGARDIHGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMANAGEMENTBRANCH(MNBB7714)gUSTNUCLEARREGULATORYCOMMISSION>>l}ASHIHGTON,DC20555-0001AHDTOTHEPAPERWORKREDUCTIONPROJECT(31500104),OFFICEOFMANAGEMENTAHDBUDGETWASHINGTONDC20503.FACILITYNA}lE1R.E.GinnaNuclearPowerPlant.DOCKETNWBER2YEAR0500024494-00202LERNUMBER6SEQUENTIALREVISIONPAGE3TEXT(Ifmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)B.INTERMEDIATECAUSE:TheintermediatecauseoftheobstructionofthecommonpressuresensinglineatPen.203Awasabuildupofcorrosionproductsinthisline,whichis1/2inchOD,0.065inchwallthickness,carbonsteeltubing.Thesecorrosionproductswerevisuallyexaminedandfoundtobereddishbrown/blackincolor,visuallyresemblingironoxidescale.IL'bj,'s;l::.'bu'iaM)j<.,-.".'.e'f.::,.;Cori:.;epiq'ii:.:'.:;'pro'ductsC.ROOTCAUSE:Theunderlyingcauseofthe,,",:...,",;g>>e:,,g:":f*,:g,,"::,.:CalibratianfriO-s',,th>>e:,;:;::,::,".Sp'e'ifi'CSenSinglineconfiguration.Z&Cpersonnelhavecali.bratedthesetransmitterswithawater-filleddeadweighttesterformanyyears.Theconfigurationofthetransmitterandsensinglineforv'~<Pen'".::.'-.::.',:,203Apreventedthedrainageofallthewateraftercalibration.Afterthetransmitterwasunisolatedaspartofthecalibrationprocess,thetrappedwatertraveleddowntothelowportionofthesensinglienl:ii':.:h>>,>>ea~rlj!R:::i:,sthvg'A}Amvggv>>>>~hggge~''>>gg>>hvg~pg'va>>>>hghvgv'vgseggg~agvug>>vp'uhv>>AYAH%'''&>>&Ah"v>>gev>>>>frigg:A>>vvrgguhvuhpDg>>hvahug&gsh>>hsYAm>>h''hug>>A>>>>va+ggvgasgvgergIhae}::ieav>>eA'~i::,:::.'::::.~~sjMRQ@Perfoihrmanceijlxhn>>rigca'togrp>>'&regrege'0'aHRCFORM366A(5-92)
are8,wasSI,)~946Engineered SafetyFeaturesthatrelyonCNMTpressureinputsSafetyInjection Actuation (SI),SteamLineIsolation, andContainment SprayActuation (CNMTSpray).Noneofthesefeatureswasaffectedbytheinoperability ofP-947andP-94becauseatnotime,fromJune24,1992,toFebruary4,1994,CNMTpressureatorneartheactuation setpoints (4PSIGfor18PSIGforSteamLineIsolation, and28PSIGforCNMTSprayDuringthisperiod,theredundant channels(forP-947thechannelsareP-945andP-949;forP-948thechannelsareP-andP-950)wereinserviceandwerenottakenoutofserviceunlesstheaffectedbistables wereplacedinthetrippeddt""":,',,E".",X.;:
NRCFORH366A(5-92).S.NUCLEARREGULATORYCQIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYOMBNO.3150-0104EXPIRES5/31/95ESTIHATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORHATIONCOLLECTIONREQUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORHATIONANDRECORDSMANAGEMENTBRANCH(HNBB7714),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(31i0-0104),OFFICEOFMANAGEMENTANDBUDGETWASHINGTONDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNINBER2YEAR0500024494LERNUMBER6SEQUENTIALM--002REVISION02PAGE39;ii,"'OP;:sl%".4ITEXT(Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A)(17)Stagnantwaterhaerema'inedinthecarbonsteelsensing~ee5'hajj'i;:,':,':;4'0'i:.':,:.:Pjyi>><i203)";forasubstantialperiodoftimea,f'5ejgje'ajhcol'fbi'i%iixi.Underetteh'thp'seconditions,significant,corrosionofthecarbonsteelmaterial8ecvieid.Thecorrosionproduct,hydratedironoxide(commonrust)"'isvoluminous,occupyingmanytimesthevolumeofthemateriallosttothecorrosionprocess.Sufficientcorrosionproductaccumulatedtoblockthesensinglinetubing,resultingintheinoperabilityofP-947andP-948.IV.ANALYSISOFEVENTThiseventisreportableinaccordancewith10CFR50.73,LicenseeEventReportSystem,item(a)(2)(i)(B),whichrequiresareportof,"Anyoperationorconditionprohibitedbytheplant'sTechnicalSpecifications".CNMTpressurechannelsP-947andP-948wereinoperableforaconsiderablelengthoftime,''co'n~yjj,'~iBci,':qtheiIragiji'eaM~reiofTsTable3.5-2,unitsgl.b.,2.b.,andf.c.Operationi'isconditionsinceJune24,1992isaconditionprohibitedbyTS.Anassessmentwasperformedconsideringboththesafetyconsequencesandimplicationsofthisevent.TheresultsofthisassessmentarethattherewerenooperationalorsafetyconsequencesorimplicationsattributedtotheinoperabilityofP-947andP-948because:oAreviewofplanthistoryandpreventivemaintenancehistoryfileshasshownthattheredundantCNMTpressurechannels(P-945,P-946,P-949,andP-950)havebeeneitheroperableorplacedintheconservativetrippedstatefromtheEventdatetotheDiscoverydate,-':::,i,.'::except:";,:,:::ifi:.,'priaOp3Xrima'tely~ii'iiii's.S;:;a!88'Cend8!'iOnliiDracenb'sr-'."i".25'p.:.i'2:,"'.oAreviewofPPCSdatahasshownthattheredundantpressurechannelshaverespondedtopressurizationofthesensinglinesandpressurechangesinCNMT.IV'i'sualgirn,epgot3cne."O'OCIFSilSC'e'p,'.:4548tothesamefailuremodeasP-947andP-948.NRCFORH366A(5-92)
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NRCFORM366A(5.92)U.SNUCLEARREGULATORYCQIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYOMBNO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIONREQUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORMATIONAHDRECORDSMANAGEMENTBRANCH(MNBB7714),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(3140-0104),OFFICEOFMANAGEMENI'NDBUDGETWASHINGTONDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNUMBER205000244YEAR94LERNUMBER6SEQUENTIAL--002-REVISION02PAGE3'30i~O,F,,":::::3'4:TEXT(Ifmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)oThe2outof3logi'c(2/3)requiredforactuationofSIwasreducedtoa2/2logicwiththeinoperabilityofP-947.ThusSIactuationfromhkghCNMTpressure(4PSIG)wouldhaveoccurredasassumedinthedesignbasis.0ThediverseactuationcircuitryforSIhasthreeadditionalmeansofactuation(steamgeneratorlowsteampressure,pressurizerlowpressure,andManual).NoneofthesediversemeanswasaffectedbytheinoperabilityofP-947.oThe2/3logicrequiredforSteamLineIsolationactuationwasreducedtoa2/2logicwiththeinoperabilityofP-948.pressure(18PSIG)wouldhaveoccurredasassumedinthedesignbasis.oThediverseactuationcircuitryforSteamLineIsolationhasthreeadditionalmeansofactuation(hi-histeamflowwithsafetyinjection,histeamflowand2/4lowTavgwithsafetyinjection,andManual).NoneofthesediversemeanswasaffectedbytheinoperabilityofP-948.oThe2/3plus2/3logicrequiredforCNMTSprayactuationwasreducedtoa2/2plus2/2logicwiththeinoperabilityofP-947andP-948':",:::except'''or.,':.'.:':,".approx';.mate1y,;".:;nine'!3'(9)j:",.,"second's:wCvWayC...'';'.Pj.V:''';'P'5mVN'+'.WNNRv..::+9~~"%Xv."VNw."$"w)~.&#xc3;>O'4'Wr>.a~v.~&(i:)).,w''iw'%4iN5'gN'V'WC'Op'.-:;:(pe'C'ember:;:.:'.;:,:24'j'"::.-,,'-:',1'9924Thus,CkfMTSprayactuation'from~h-CNNTpressuie(28PSIG)wouldhaveoccurredasassumedinthedesignbasis.oThealternateactuationcircuitryforCNMTSpray(Manual)wasnotaffectedbytheinoperabilityofP-947andP-948.HRCFORM366A(5-92)
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NRCFORM366A(5-92)U.SNUCLEARREGULATORYCQBIISSIOHLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBYOMBNO.3150-0104EXPIRES5/31/95IESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIONREQUEST:50.0HRS.FORWARDCOMMENTSREGARDINGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMANAGEMENTBRANCH(MHBB7714),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTOH,DC20555-0001,AHDTOTHEPAPERWORKREDUCTIONPROJECT(3150-0104),OFFICEOFMANAGEMENTANDBUDGET'WASHIHGTOHDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNNIBER205000244YEAR94LERNUMBER6SEQUENTIAL--002--REVISION02PAGE3L3~''.'',:OSCAR,@4cTEXT(Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A)(17)Nvcyplpcpcyp""vyypcCcw'~ypyykvcccccccwvcyyy~...CypvrMCtcpyyy~w~gCvC:'Cpcvppy''pppyyCpgvyC"CCpycycxwq>w"Cvw".vpwvw,sMw",yy,e>wyc,ypvwy'~sv}vv"vgCyp>wnyyyyyg.~wcyl~".ne~jSX-ai.:uaC'i'onjixsta4ie-@xoig~>enanne'i;:-P,;I'ccccppy+,,c,~p.,Cv,av+$CCRjp&%0p'tcwxCcvpppyvwxvwypepp?'v'p(%vC'?'v.,wpppw"pwp..feyY:..,vyvywc'>.yywA,"vcwC,.%,.vyvc'.vpp',r',~yy,'>:;cyA,"v>pavedciw7wkine':<:;..'9:::.,".,s'i5~6n'~iiY8r'vo''a'e'I,c()n,'i':()n:,"'"'"VNSNh~~vccyNQRhfpMc4MxL'(&cvc'Cvykckc@c~HRCFORM366A(5-92)
":''-""'!!!""";,:;:
NRCFORH366A(5-92)U.S.NUCLEARREGULATORYC(NNISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYINIBNO.3150-0104EXPIRES5/31/95ESTIHATEDBURDENPERRESPONSETOCOHPLYWITHTHISINFORHATIONCOLLECTIONREQUEST:50.0HRS~FORWARDCONHENTSREGARDINGBURDENESTINATETOTHEINFORHATIOHANDRECORDSHANAGEMEHTBRANCH(HHBB7714),U.S.NUCLEARREGULATORYCOHHISSIOH,WASHINGTON,DC20555-0001ANDTOTHEPAPERWORKREDUCTIONPROJECT(3140-0104),OFFICEOFHANAGEHENTANDBUDGETWASHINGTONDC20503.FACILITYHAHE1DOCKETNIMBER2YEARLERNlMBER6)SEQUENTIALREVISIOHPAGE3R.E.GinnaNuclearPowerPlant0500024494--002--02TEXT(Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A)(17)rN:~".--:Basedontheabove,itcanbeconcludedthatthepublic'shealthandsafetywasassuredatalltimes.V.CORRECTIVEACTIONA.ACTIONTAKENTORETURNAFFECTEDSYSTEMSTOPRE-EVENTNORMALSTATUS:oTheironoxidescale-wasremovedfromtheobstructedpenetrationsensinglineandP-947andP-948wererestoredtooperablestatus.oTheotherchannelsthatmonitorCNMTpressurewereverifiedtorespondtosmallchangesinCNMTpressure.HRCFORH366A(5-92)
conztz.onj~<e)('0'epr":.;:,,'"'xol-,';::.::.,'aper'axe%'ai'ei:jr,':,'',::'sine;>,"::(ji) i;:,:,:::se'concl''s':
NRCFORH366A(5-92).S.NUCLEARREGULATORYC(HIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONPROVEDBYQQNO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOHPLYWITHTHISINFORMATIONCOLLECTIONREOUEST:50.0HRS.FORWARDCOHHENTSREGARDIHGBURDENESTIHATETOTHEINFORHATIOHANDRECORDSMANAGEHENTBRANCH(MHBB7714),U.S.NUCLEARREGULATORYCOHHISSION,WASHINGTON,DC20555-0001AHDTOTHEPAPERWORKREDUCTIONPROJECT(3140-0104),OFFICEOFMANAGEMENTAHDBUDGETWASHINGTONDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNQIBER205000244YEAR94-00202LERNIMBER6SEOUENTIALREVISIONPACE3ljig?'g'OP>:i,'s'.'>g'cgTEXT(Ifmorespaceisrequired,useadditionalcopiesofHRCForm366A)(17)B.ACTIONTAKENORPLANNED'OPREVENTRECURRENCE:oPPCScomputerpointsforCNMTpressurewillbearchiveddailyuntilthe1994refuelingoutagetoverifychannelvVvvI)oThesensinglinesforallCNMTpressurechannelswillbeinsectedandcleanedoutduringthe1994refuelingoutage.oThemethodofcalibrationoftheCNMTpressuretransmittershasbeenchangedtousegas(insteadofwater)asthetestccQ~w&4~?v'wccggcg~ccc~ccccv?+wvYp~v?ccw???v?c?vsNvccvc.'i."(pY."wp&c?vv?v54<r"'v,cvcvgmedium.?"ese::,xe'vms'ea:-:,:;,::proc'e'dUxe's.:;:::'.::vere'..::..u'si'd!-'.'to:;'::,per'for'iaprai~rit'i~i''::::;i'IIcm~:ran''cp';!"'"'*""'"""'""""='''""oTestingthesecontainmentpenetrationshasbeenenhancedtoincludeformaldocumentationo'fpressurechannelresponse.>~:e'kaid'~~b8inh"::~ins.ii','.i,""'ep''C'os't'a3'.:HRCFORH366A(5-92)
':on;"::"::
NRCFORM366A(5-92)U.S.NUCLEARREGULATORYCQHIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATIONAPPROVEDBY(HLBNO.3150-0104EXPIRES5/31/95ESTIMATEDBURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIONCOLLECTIOHREQUEST:50'HRS.FORWARDCOMMENTSREGARDIHGBURDENESTIMATETOTHEINFORMATIONANDRECORDSMAHAGEMENI'RANCH(MHBB7714),U.S.NUCLEARREGULATORYCOMMISSION,WASHINGTON,DC20555-0001,ANDTOTHEPAPERWORKREDUCTIONPROJECT(3150-0104),OFFICEOFMANAGEMENTANDBUDGETWASHINGTONDC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNINBER205000244LERNUMBER6YEARSEQUENTIAL94-002REVISION02PAGE3m~"~O~~"~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)}}
9'8cQmb:e&#xc3;,'l:;:::.'04:.;::::;"':f 99,2,:;":~
E.METHODOFDISCOVERY:
Thiseventwasfirstidentified duetotheastuteobservation ofaControlRoomoperatoronJanuary20,1994,whoquestioned aslightdifference inindications forCNMTpressure.
Thesmalldeviation betweenredundant channelswaswithinthetolerance ofMainControlBoardinstrumentation channelchecks.ThemonthlyChannelFunctional TestsandannualChannelCalibrations associated withthesechannels(asrequiredbyTSTable4.1-1forunits&#xb9;17and&#xb9;25)didnotdetecttheobstructed tubinglineduetothelocationoftheobstruction.
ThesludgewaslocatedbetweenCNMTandtherootisolation valvesforPT-947andPT-948.Theserootisolation valvesareclosedduringperformance ofthenecessary testsandcalibrations, inordertopressurize thevolumebetweenthevalveandthepressuretransmitter.
Thismethodoftestingisconsistent withthedefinition ofChannelFunctional Testing,asdefinedinTS1t7~3~a~ThefactthatthiseventaffectedbothchannelsP-947andP-948wasidentified asaresultoftheinvestigations performed byI&Cpersonnel onFebruary2,1994.NRCFORM366A(5.92)
NRCFORH366A(5-92)U.S.NUCLEARREGULATORY CQHISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOHBNO.3150-0104 EXPIRES5/31/95ESTINATED BURDENPERRESPONSETOCOHPLYWITHTHISINFORNATION COLLECTION REQUEST:50.0HRS.FORWARDCOHHEHTSREGARDING BURDENESTIHATETOTHEINFORHATIOH ANDRECORDSHAHAGEHENT BRANCH(HNBB7714),U.S.NUCLEARREGULATORY COHHISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3110.0104),
OFFICEOFNANAGEHEHT ANDBUDGETWASHINGTON DC20503.FACILITYNAHE1R.E.GinnaNuclearPowerPlantDOCKETHNBER205000244LERHIHIBER6YEARSEQUENTIAL 94--002--REVISIOH02PAGE3TEXT(Ifmorespaceisrequired, useadditional coPIesofNRCForm366A)(17)Amoredetailedreview'ofthearchivedPPCSrecordsofCNMTpressureconcluded thatchannelP-947hadnotresponded tochangesinCNMTpressuresinceJune24,1992,beginning atapproximately 1500EDST.NotethatwhileCNMTpressurechannelP-947ismonitored bythePPCS,channelP-948isnot.Inaddition, PI-948(andalsoPI-946andPI-950)haveascaleof10to200PSIA(absolute pressure).
Bycomparison, PI-947(andalsoPI-945andPI-949)haveascaleof0to60PSIG.ItisassumedthatP-948hadnotresponded tochangesinCNMTpressureforthesameamountoftimeasP-947.F.OPERATORACTION:TheControlRoomoperators observedthatthePI-947readingwasinconsistent onJanuary20,1994,andinitiated aMWR/TR.AfterbothchannelsP-947andP-948werediscovered tobeinoperable, theControlRoomoperators performed emergency restoration procedure ER-INST.1 andplacedtheaffectedbistables inthetrippedcondition.
Subsequently, theControlRoomoperators ensuredthathighersupervision andtheNRCResidentInspector hadbeennotifiedofthisevent.G.SAFETYSYSTEMRESPONSES:
NoneIII.CAUSEOFEVENTA.IMMEDIATE CAUSE:Theimmediate causeoftheeventwasthefailureofP-947andP-948torespondtochangesinCNMTpressureduetoobstruction ofthecommonpressuresensingline.NRCFORH366A(5.92)
NRCFORM366A(5-92)U.S.NUCLEARREGULATORY CO}IIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYQUINO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDIHG BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRANCH(MNBB7714)gUSTNUCLEARREGULATORY COMMISSION>>
l}ASHIHGTON, DC20555-0001 AHDTOTHEPAPERWORK REDUCTION PROJECT(31500104),OFFICEOFMANAGEMENT AHDBUDGETWASHINGTON DC20503.FACILITYNA}lE1R.E.GinnaNuclearPowerPlant.DOCKETNWBER2YEAR0500024494-00202LERNUMBER6SEQUENTIAL REVISIONPAGE3TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)B.INTERMEDIATE CAUSE:Theintermediate causeoftheobstruction ofthecommonpressuresensinglineatPen.203Awasabuildupofcorrosion productsinthisline,whichis1/2inchOD,0.065inchwallthickness, carbonsteeltubing.Thesecorrosion productswerevisuallyexaminedandfoundtobereddishbrown/black incolor,visuallyresembling ironoxidescale.IL'bj,'s;l::.'bu'iaM) j<.,-.".'.e'f.::,.;Cori:.;epiq'ii:.:'.:;'pro'ducts C.ROOTCAUSE:Theunderlying causeofthe,,",:...,",;g>>e:,,g:":f*,:
g,,"::,.:
Calibratian friO-s',,th>>e:,;:;::,::,".Sp'e'ifi'C SenSinglineconfiguration.
Z&Cpersonnel havecali.brated thesetransmitters withawater-filled deadweight testerformanyyears.Theconfiguration ofthetransmitter andsensinglineforv'~<Pen'".::.'-.::.',:,203A prevented thedrainageofallthewateraftercalibration.
Afterthetransmitter wasunisolated aspartofthecalibration process,thetrappedwatertraveleddowntothelowportionofthesensinglienl:ii':.
:h>>,>>ea~rlj!R:::i:,
sthvg'A}Amvggv>>>>~hggge~''>>gg>>hvg~pg
'va>>>>hghvgv'vgseggg~agvug>>vp'uhv>>AYAH%'''&>>&Ah" v>>gev>>>>frigg:A>>vvrgguhvuhpDg>>hvahug&gsh>>hs YAm>>h''hug>>A>>>>va+ggvgasgvger gIhae}::ieav>>
eA'~i::,:::.'::::.~~sjMRQ@Perf oihrmanceijlxhn>>rigca'togrp>>'&
regrege'0'a HRCFORM366A(5-92)
NRCFORH366A(5-92).S.NUCLEARREGULATORY CQIIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOMBNO.3150-0104 EXPIRES5/31/95ESTIHATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORHATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORHATION ANDRECORDSMANAGEMENT BRANCH(HNBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(31i0-0104),
OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNINBER2YEAR0500024494LERNUMBER6SEQUENTIAL M--002REVISION02PAGE39;ii,"'OP;:sl%".4I TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)Stagnantwaterhaerema'ined inthecarbonsteelsensing~ee5'hajj'i;:,':,':;4'0'i:.':,:.:Pjyi>><i203)";
forasubstantial periodoftimea,f'5ejgje'ajh col'fbi'i%iixi.
Underetteh'thp'seconditions, significant, corrosion ofthecarbonsteelmaterial8ecvieid.
Thecorrosion product,hydratedironoxide(commonrust)"'is voluminous, occupying manytimesthevolumeofthemateriallosttothecorrosion process.Sufficient corrosion productaccumulated toblockthesensinglinetubing,resulting intheinoperability ofP-947andP-948.IV.ANALYSISOFEVENTThiseventisreportable inaccordance with10CFR50.73,LicenseeEventReportSystem,item(a)(2)(i)(B),whichrequiresareportof,"Anyoperation orcondition prohibited bytheplant'sTechnical Specifications".
CNMTpressurechannelsP-947andP-948wereinoperable foraconsiderable lengthoftime,''co'n~yjj,'
~iBci,':qth eiIragiji'eaM~rei ofTsTable3.5-2,unitsgl.b.,2.b.,andf.c.Operation i'iscondition sinceJune24,1992isacondition prohibited byTS.Anassessment wasperformed considering boththesafetyconsequences andimplications ofthisevent.Theresultsofthisassessment arethattherewerenooperational orsafetyconsequences orimplications attributed totheinoperability ofP-947andP-948because:oAreviewofplanthistoryandpreventive maintenance historyfileshasshownthattheredundant CNMTpressurechannels(P-945,P-946,P-949,andP-950)havebeeneitheroperableorplacedintheconservative trippedstatefromtheEventdatetotheDiscovery date,-':::,i,.'::except:";,:,:::if i:.,'priaOp3Xrima'tel y~ii'iiii's
.S;:;a!88'Cend8!'iOnliiDracenb'sr-'."i".25'p
.:.i'2:,"'.
oAreviewofPPCSdatahasshownthattheredundant pressurechannelshaveresponded topressurization ofthesensinglinesandpressurechangesinCNMT.IV'i'sualgirn,epgot3cne."
O'OCIFSilSC'e'p,
'.:4548tothesamefailuremodeasP-947andP-948.NRCFORH366A(5-92)
NRCFORM366A(5.92)U.SNUCLEARREGULATORY CQIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOMBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION AHDRECORDSMANAGEMENT BRANCH(MNBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),
OFFICEOFMANAGEMENI'ND BUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNUMBER205000244YEAR94LERNUMBER6SEQUENTIAL
--002-REVISION02PAGE3'30i~O,F,,":::::3'4:
TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)oThe2outof3logi'c(2/3)requiredforactuation ofSIwasreducedtoa2/2logicwiththeinoperability ofP-947.ThusSIactuation fromhkghCNMTpressure(4PSIG)wouldhaveoccurredasassumedinthedesignbasis.0Thediverseactuation circuitry forSIhasthreeadditional meansofactuation (steamgenerator lowsteampressure, pressurizer lowpressure, andManual).Noneofthesediversemeanswasaffectedbytheinoperability ofP-947.oThe2/3logicrequiredforSteamLineIsolation actuation wasreducedtoa2/2logicwiththeinoperability ofP-948.pressure(18PSIG)wouldhaveoccurredasassumedinthedesignbasis.oThediverseactuation circuitry forSteamLineIsolation hasthreeadditional meansofactuation (hi-histeamflowwithsafetyinjection, histeamflowand2/4lowTavgwithsafetyinjection, andManual).Noneofthesediversemeanswasaffectedbytheinoperability ofP-948.oThe2/3plus2/3logicrequiredforCNMTSprayactuation wasreducedtoa2/2plus2/2logicwiththeinoperability ofP-947andP-948':",:::except'''or.,':.'.:':,".approx';.mate1y,;".:;nine'!3'(9)j:",.,"second's:
wCvWayC...
'';'.Pj.V:''';'P'5mVN'+'.WNNRv..::+9~~"%Xv."V Nw."$"w)~.&#xc3;>O'4'Wr>.a~v.~&(i:)).,w''
iw'%4iN5'gN'V'WC
'Op'.-:;:(pe'C'ember:;:.:'.;:,:24'j'"::.-,,'-:',1'9924 Thus,CkfMTSprayactuation'from
~h-CNNTpressuie(28PSIG)wouldhaveoccurredasassumedinthedesignbasis.oThealternate actuation circuitry forCNMTSpray(Manual)wasnotaffectedbytheinoperability ofP-947andP-948.HRCFORM366A(5-92)
NRCFORM366A(5-92)U.SNUCLEARREGULATORY CQBIISSIOH LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYOMBNO.3150-0104 EXPIRES5/31/95IESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRANCH(MHBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTOH, DC20555-0001, AHDTOTHEPAPERWORK REDUCTION PROJECT(3150-0104),
OFFICEOFMANAGEMENT ANDBUDGET'WASHIHGTOH DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNNIBER205000244YEAR94LERNUMBER6SEQUENTIAL
--002--REVISION02PAGE3L3~''.'',:OSCAR,@4c TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)Nvcyplpcpcyp""vyypcCcw'~ypyykvcccccccwvcyyy~...CypvrMCtcpyyy
~w~gCvC:'Cpcvppy''pppyyCpgvyC "CCpycycxwq>w "Cvw".vpwvw,sMw",yy,e>wyc,ypvwy'~sv}vv"vgCyp>wnyyyyyg.~wcyl~".ne~jSX-ai.:uaC'i'onjixsta4ie-@xoig~>enanne'i;:-P,;
I'ccccppy+,,c,
~p.,Cv,av+$CCRjp&%0p'tcwx Ccvpppyvw xvwypepp?'v'p(%vC'?'v.,wpppw "pwp..feyY:..,vyvywc'>.yywA,"vcwC,.%,.vyvc'.vpp',r',~yy,
'>:;cyA,"v>pavedciw7wkine':<:;..'9:::.,".,s'i5~6n'~iiY 8r'vo''a'e'I,c()n,'i
':()n:,"'"'"VNSNh~~vccyNQRhfpMc4MxL'(&cvc'Cvykckc@c~
HRCFORM366A(5-92)
NRCFORH366A(5-92)U.S.NUCLEARREGULATORY C(NNISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYINIBNO.3150-0104 EXPIRES5/31/95ESTIHATED BURDENPERRESPONSETOCOHPLYWITHTHISINFORHATION COLLECTION REQUEST:50.0HRS~FORWARDCONHENTSREGARDING BURDENESTINATETOTHEINFORHATIOH ANDRECORDSHANAGEMEHT BRANCH(HHBB7714),U.S.NUCLEARREGULATORY COHHISSIOH, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),
OFFICEOFHANAGEHENT ANDBUDGETWASHINGTON DC20503.FACILITYHAHE1DOCKETNIMBER2YEARLERNlMBER6)SEQUENTIAL REVISIOHPAGE3R.E.GinnaNuclearPowerPlant0500024494--002--02TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)rN:~".--:Basedontheabove,itcanbeconcluded thatthepublic'shealthandsafetywasassuredatalltimes.V.CORRECTIVE ACTIONA.ACTIONTAKENTORETURNAFFECTEDSYSTEMSTOPRE-EVENT NORMALSTATUS:oTheironoxidescale-was removedfromtheobstructed penetration sensinglineandP-947andP-948wererestoredtooperablestatus.oTheotherchannelsthatmonitorCNMTpressurewereverifiedtorespondtosmallchangesinCNMTpressure.
HRCFORH366A(5-92)
NRCFORH366A(5-92).S.NUCLEARREGULATORY C(HIIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYQQNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOHPLYWITHTHISINFORMATION COLLECTION REOUEST:50.0HRS.FORWARDCOHHENTSREGARDIHG BURDENESTIHATETOTHEINFORHATIOH ANDRECORDSMANAGEHENT BRANCH(MHBB7714),U.S.NUCLEARREGULATORY COHHISSION, WASHINGTON, DC20555-0001 AHDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),
OFFICEOFMANAGEMENT AHDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNQIBER205000244YEAR94-00202LERNIMBER6SEOUENTIAL REVISIONPACE3ljig?'g'OP>:i,'s'.'>g'cg TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)B.ACTIONTAKENORPLANNED'O PREVENTRECURRENCE:
oPPCScomputerpointsforCNMTpressurewillbearchiveddailyuntilthe1994refueling outagetoverifychannelvVvvI)oThesensinglinesforallCNMTpressurechannelswillbeinsectedandcleanedoutduringthe1994refueling outage.oThemethodofcalibration oftheCNMTpressuretransmitters hasbeenchangedtousegas(insteadofwater)asthetestccQ~w&4~?v'wccggcg~ccc~
ccccv?+wvYp~v?ccw???v?c?vsNvccvc.'i.
"(pY."wp&c?vv?v54<r"
'v,cvcvgmedium.?"ese::,xe'vms'ea:-:,:;,::proc'e'dUxe's.:;:::'.::vere'..::..u'si'd!-'.'to:;'::,per'for'ia prai~rit'i~i''::::;i'IIc m~:ran''cp';!
"'"'*""'"""'""""='''""oTestingthesecontainment penetrations hasbeenenhancedtoincludeformaldocumentation o'fpressurechannelresponse.>~:
e'kaid'~~b8inh"::~ins.i i','.i,""'ep''C'os't'a3'.:
HRCFORH366A(5-92)
NRCFORM366A(5-92)U.S.NUCLEARREGULATORY CQHIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBY(HLBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTIOH REQUEST:50'HRS.FORWARDCOMMENTSREGARDIHG BURDENESTIMATETOTHEINFORMATION ANDRECORDSMAHAGEMENI'RANCH (MHBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001, ANDTOTHEPAPERWORK REDUCTION PROJECT(3150-0104),
OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNINBER205000244LERNUMBER6YEARSEQUENTIAL 94-002REVISION02PAGE3m~"~O~~"~4TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)VI.ADDITIONAL INFORMATION A.FAILEDCOMPONENTS:
Therewerenofailedcomponents.
Theobstructed sensinglineis1/2inchOD,0.065inchwallthickness, carbonsteeltubing.Information aboutthevendorandmanufacturer isnotrelevanttothisevent.B.PREVIOUSLERsONSIMILAREVENTS:AsimilarLEReventhistorical searchwasconducted withthefollowing results:LER92-003wasalsoaneventcausedbyanobstructed pressuresensingline.However,theobstruction wascausedbybuildupofsludgefromnormalimpurities intheprocessfluid(feedwater).
Theobstruction referredtoinLER94-002wascausedbycorrosion fromtheinteraction ofthetestmediumandthesensinglinematerials.
C.SPECIALCOMMENTS:
NoneHRCFORM366A(5-92)}}

Revision as of 11:57, 29 June 2018

LER 94-002-02:on 940202,containment Pressure Channels P-947 & P-948 Were Inoperable.Caused by Water Being Trapped in Low Point of Line.Corrective Action:Iron Oxide Scale Was Removed & Sensing Line restored.W/940506 Revised Ltr
ML17263A637
Person / Time
Site: Ginna Constellation icon.png
Issue date: 05/06/1994
From: MECREDY R C, ST MARTIN J T
ROCHESTER GAS & ELECTRIC CORP.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-94-002, LER-94-2, NUDOCS 9405100227
Download: ML17263A637 (18)
v • d • e


Text

ACCELERATED DISTRIBUTION DEMOblSj.RA'i'LON 5YdlelvittREGULATORY INFORMATION DISTRIBUTION SYSTEM(RIDS)ACCESSION NBR:9405100227 DOC.DATE:

94/05/06NOTARIZED:

NOFACIL:50-244 RobertEmmetGinnaNuclearPlant,Unit1,Rochester GAUTH.NAMEAUTHORAFFILIATION ST.MARTIN,J.T.

Rochester Gas&ElectricCorp.MECREDY,R.C.

Rochester Gas&ElectricCorp.RECIP.NAME RECIPIENT AFFILIATION DOCKET05000244

SUBJECT:

LER94-002-02:on 940202,Containment PressurechannelsP-947&P-948wereinoperable.

Causedbywaterbeingtrappedinalowpointofline.Corrective action:iron oxidescalewasremoved&sensinglinewererestoredchannels.W/940506 ltr.DISTRIBUTION CODE:IE22TCOPIESRECEIVEDLTR(ENCLLSIZE:TITLE:50.73/50.9 LicenseeEventReport(LER),IncidentRpt,etc.NOTES:License Expdateinaccordance with10CFR2,2.109(9/19/72).

DA05000244DRECIPIENT IDCODE/NAME PD1-3PDINTERNAL:

AEOD/DOAAEOD/ROAB/DS PNRR/DE/EMEB NRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DRSS/PRPB NRR/DSSA/SRXB RES/DSIR/EIB EXTERNAL:

EG&GBRYCE,J.H NRCPDRNSICPOORE,W.COPIESLTTRENCL111122111111221111221111RECIPIENT IDCODE/NAME JOHNSON,A AEOD/DSP/TPAB NRR/DE/EELB NRR/DORS/OEAB NRR/DRCH/HICB NRR/DRIL/RPEB NRR/j3SGh.

SPLBBEGFILE02N1~FLEOlLSTLOBBYWARDNSICMURPHY,G.A NUDOCSFULLTXTCOPIESLTTRENCL11111111111111111111=1111DR~ygoqzg(>Lop.DNOTETOALL"RIDS"RECIPIENTS:

PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.20079)TOELIMINATE YOURNAMEFROMDISTRIBUTION LISTSFORDOCUMENTS YOUDON'TNEED!DDFULLTEXTCONVERSION REQUIREDTOTALNUMBEROFCOPIESREQUIRED:

LTTR27ENCL27 cROCHESTER GASANDELECTRICCORPORATION 89EASTAVENUE,Nr~rc'Ix51accROCHESTER N.Y.14649-0001 ROBERTC.h<ECREDYVicePrerident Crone,NuclcrrrProduction TELEottONE aBEaCODEPre546.2700Maj;;:6,1994U.S.NuclearRegulatory Commission DocumentControlDeskAttn:AllenR.JohnsonProjectDirectorate I-3Washington, D.C.20555

Subject:

LER94-M2,Re@)sigil'.":,.:,':2>

Containment PressureTransmitters Inoperable, DuetoBlockageofSensingLinebyCorrosion

Products, CausesaCondition Prohibited byTechnical Specifications R.E.GinnaNuclearPowerPlantDocketNo.50-244Inaccordance with10CFR50.73,LicenseeEventReportSystem,item(a)(2)(i)(B),whichrequiresareportof,"Anyoperation orcondition prohibited bytheplant'sTechnical Specifications",

theattachedLicenseeEventReportLER94-002,Revisio'j',':;::,::,':2::;::

isherebyr'nMCeMr'rnen wsubmitted.

4'c%.(rerggp~pr:

','@c.r++r4 rexggj:,'@AN xenrnr~~~~rrrccctrcrrnrrn&rrrrruxrrrrCCc@crnrS~xNxa&4

+%re'r.4.4>-"~~~."r4n~r&AxcAN~CeM rtiii'inde'd~i'ii"'Oiisgiiiisi~ii>

Thiseventhasinnowayaffectedthepublic'shealthandsafety.Veryrulyyours,obertC.Mecryxc:U.S.NuclearRegulatory Commission RegionI475Allendale RoadKingofPrussia,PA19406GinnaSeniorResidentInspector

~fcr;"rr4Q'r,"l,I<pcJ5j)4zd7g~lzsDf9405100227 940506PDRADOCK050002448PDRg>PP NRCFORM366(5-92)U.S.NUCLEARREGULATORY CQOIISSIOH PROVEDBYQlgNO.3150-0104 EXPIRES5/31/95LICENSEEEVENTREPORT(LER)(Seereverseforrequirednumberofdigits/characters foreachblock)ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRANCH(MNBB7714),U.STNUCLEARREGULATORY COHHISSION, l}ASHINGIOH, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(31/0-0104),

OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FAGILITYNAME(1)R.E~GinnaNuclearPowerPlantDOCKETHQlBER(2)05000244PAGE(3)1OF14iTITLE(4)ContairN}ent PressureTransmitters Inoperable, DuetoBlockageofSensingLinebyCorrosion

Products, CausesaCondition Prohibited byTechnical Specifications MONTH02DAYYEAR0294EVENTDATE5YEAR94LERNllBER6SEQUENTIAL NUMBERREVISIONNUHBER--002---'02::4'ac'ONTH DAYYEARREPORTDATE7FACILITYNAMEDOCKETNUMBERFACILITYNAHEDOCKETNUHBEROTHERFACILITIES INVOLVED8OPERATING MQ)E(9)POWERLEVEL(10)N09820.402(b) 20.405(a)(1)(i)20.405(c) 50.36(c)(1) 50.73(a)(2)(iv) 50.73(a)(2)(v) 73.71(b)73.71(c)20.405(a)(1)(ii) 50.36(c)(2) 20.405(a)(1)(iii)

X50.73(a)(2)(i) 20'05(a)(1)(iv) 20.405(a)(1)(v) 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) 50'3(a)(2)(x)

OTHER(SpecifyinAbstractbelowandinText,NRCForm366ATHISREPORTISSUBHITTED PURSUANTTOTHEREQUIREMENTS OF10CFR:Checkoneormore11NAMEJohnT.St.Hartin-Director, Operating Experience TELEPHONE NUMBER(IncludeAreaCode)(315)524-4446CQlPLETEONELINEFOREACHCQlPOHEHT FAILUREDESCRIBED INTHISREPORT'13CAUSESYSTEMCOHPONENT MANUFACTURER REPORTABLE TONPRDSCAUSESYSTEHCOMPONENT MANUFACTURER REPORTABLE TONPRDSSUPPLEMENTAL REPORTEXPECTED14YES(Ifyes,completeEXPECTEDSUBHISSION DATE).XNOEXPECTEDSUBHISSIONDATE(15)HONTHDAYYEARABSTRACT(Limitto1400spaces,i.e.,approximately 15single-spaced typewritten tines)(16)OnFebruary2,1994,atapproximately 1642EST,withthereactoratapproximately 989steadystatepower,ControlRoomoperators determined thatContainment.

PressurechannelsP-947andP-948wereinoperable.

Basedonpost-event reviewofcomputerdata,thiscondition wasinviolation ofTechnical Specification Table3.5-2ActionStatements.

Immediate corrective actionwastodefeattheinoperable channelsbyplacingtheaffectedbistables inthetrippedcondition.

Theunderlying causeoftheeventwasanobstruction inthecommoncontainment pressuresensinglineforP947a-nilP-948Fi'i<1'6'sultiri&gjfro'm 4'..:ll"::

'"9!i-:s.:*-ll':-'oi':,,:::!!P!:::,,::!!W!ii,:,".:::::ii

':':-"-i!ilia::

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-"'"i"'ll'i-

"I'i:-*'-'.ilia',.'i""'i' i'i!ii"""-"::i'i'i::ii iiiiiiilia:,**i!'.

Corrective actionwastakentocleartheobstruction fromtheaffectedtubing,leaktestthepenetration pipingandtransmitter tubing,andverifytheproperoperation ofP-947andP-948.Corrective actiontoprecluderepetition isoutlinedinSectionV(B).iNRCFORH366(592)

NRCFORM366A(5-92)U.SNUCLEARREGULATORY COWIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOMBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTION REGUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDEHESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMEHT BRANCH(MHBB7714),U.S.NUCLEARREGULATORY COMMISSION,

'WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),

OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNNER205000244LERNUMBER6YEARSEQUENTIAL 94-002-REVISIONPAGE32OF>3TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)PRE-EVENT PLANTCONDITIONS'he plantwasatapproximately 98'teadystatereactorpowerwithnomajoractivities inprogress.

Instrument andControl(I&C)Department personnel wereinvestigating Containment PressurechannelP-947.Thisinvestigation wasinitiated byaMaintenance WorkRequest/TroubleReport(MWR/TR)writtenJanuary20,1994byControlRoomoperators becausetheMainControlBoardpressureindication forP-947(PI-947)wasobservedtobereadingslightlylowerthantheindication forContainment PressurechannelsP-945andP-949(PI-945andPI-949),whicharealsoontheMainControlBoard.II.DESCRIPTION OFEVENTA.DATESANDAPPROXIMATE TIMESOFMAJOROCCURRENCES:

oJune24,1992,1500EDST:Containment (CNMT)pressurechannelP-947outputindication startstobecomeinconsistent withchannelsP-945andP-949,asmonitored onthePlantProcessComputerSystem(PPCS).(Thisisbasedonpost-event reviewofarchiveddataonthePPCS.)Eventdateandtime.oJanuary20,1994:ControlRoomoperators submitMWR/TRonPI-947MainControlBoardindication.

oFebruary2,1994,1642EST:Discovery dateandtime.oFebruary4,1994,0007EST:Containment PressurechannelP-947isrestoredtooperablestatus.oFebruary4,1994,1536EST:Containment PressurechannelP-948isrestoredtooperablestatus.NRCFORM366A(5-92)

NRCFORM366A(5-92)U.S.NUCLEARREGULATORY CAIIISSION L1CENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOMBNO.3150-0'104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRANCH(MNBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(31400104),OFFICEOFMANAGEMENT AHDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETHIER2YEAR0500024494LERHIHIBER6SEQUENTIAL

-002--REVISIGH02PAGE33OF9!4'EXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)B.EVENT:OnJanuary20,1994,ControlRoomoperators observedthatoneMainControlBoardindication forCNMTpressure, PI-947,wasreadingslightlylowerthantheothertwoindicators, PI-945andPI-949.Theyinitiated aMWR/TR,forI&Cpersonnel toinvestigate thedifference inreadings.

OnJanuary21,I&Cperformed theannualcalibration ofthechannel.Thechannel(P-947)responded properlytoboththeelectronic checksandtoactualpressuresignalsinsertedintothetransmitter (PT-947).

Afterreviewing post-calibration trendingdataandarchivedPPCScomputertracesofCNMTpressure, I&CnoticedthatchannelP-947wasstillnottrackingconsistent withchannelsP-945andP-949.Furtherinvestigation wasconducted onFebruary2,1994,toidentifyiftherecouldbeanypossiblemechanical and/orelectrical problemswithP-947.OnFebruary2,1994,atapproximately 1612EST,withthereactoratapproximately 98%steadystatereactorpower,ControlRoomoperators declaredchannel'P-947inoperable.

Theaffectedbistables wereplacedinthetrippedcondition.

Toverifytheoperability oftheredundant CNMTpressurechannels, theoperators thencausedasmallchangeinCNMTpressurebydepressurizing CNMTperoperating procedure 0-11,"ControlofMiniPurgeExhaustValvesWhileDepressurizing Containment".

I&Cpersonnel monitored testpointsforCNMTpressurechannelsP945gP947P948)andP-949withadigitalmultimeter

.Duringthisdepressurization, atapproximately 1642EST,twochannels(P-947andP-948)didnotshowanyresponsetothesmallchangeinCNMTpressure.

TheControlRoomoperators formallydeclaredP-948inoperable atapproximately 1658EST.Theaffectedbistables wereplacedinthetrippedcondition peremergency restoration procedure ER-INST.1, "ReactorProtection BistableDefeatAfterInstrumentation LoopFailure".

P-947andP-948senseCNMTpressureviaacommonline(CNMTPenetration 203A).ACNMTentrywasmadetoverifythatthissensinglineforPT-947andPT-948,(Pen.203A)wasnotmechanically blocked.Pen.203Awasvisuallyverifiednottobeexternally obstructed.

Thevalvelineupsforthepressuretransmitters (PT-947andPT-948)wereverifiedtobecorrect.HRCFORM366A(5-92)

NRCFORM366A(5-92)U.s.NUcLEARREGULATDRY cQellssloNLICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOMBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTIOH REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION AHDRECORDSMANAGEMENT BRAHCH(MNBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTOH, DC20555-0001 AHDTOTHEPAPERWORK REDUCTION PROJECT(31400104),OFFICEOFMANAGEMENT ANDBUDGET'WASHIHGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNUMBER205000244LERNINBER6YEARSEQUENTIAL 94--002--REVISION02PAGE34OF.34TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)OnFebruary3,1994,aworkpackagefortroubleshooting andrepairoftheCNMTpenetration linewasprepared.

ACNMTentrywasmadeandPen.203Awaspressurized tothirty(30)poundspersquareinchesaboveatmospheric pressure(PSIG),usingsurveillance testprocedure PTT-23.17B, "Containment Isolation ValveLeakRateTestingContainment PressureTransmitters PT-947andPT-948Pen203A".PT-947andPT-948didnotrespondtothispressure, whichindicated ablockageinthepipingforPen.203Aorinthecommoninstrument tubingline.Backflushing withone-hundred-twenty (120)PSIGairsupplytocleartheblockagewasunsuccessful.

Pen.203AwasisolatedinsideCNMTtoprovidedoublebarrierisolation forCNMTintegrity.

Theinstrument tubingwasdisconnected outsideCNMT.Theinstrument tubingwasfoundtocontainwater,butthiswaterwasnotthesourceoftheblockage.

The1/2inchcarbonsteeltubingforPen.203Awasfoundtobemechanically blockedwithathicksludge.Theblockagewasremoved.Thetubingwasreassembled andpreparations weremadetotestthetubing.OnFebruary3,1994,atapproximately 2207EST,Pen.203Awasdeclaredinoperable toperformrequiredAppendixJtesting.TheLimitingCondition forOperation (LCO)forTechnical Specification (TS)3.6.3.1.wasentered.Pen.203Awastestedinaccordance withsurveillance testprocedure PTT-23.17B, "Containment Isolation ValveLeakRateTestingContainment PressureTransmitters PT-947andPT-948Pen203A".Itwasdocumented inPTT-23.17B thatPT-947andPT-948nowaccurately responded whenthepenetration waspressurized to60PSIG.PTT-23.17B wassuccessfully completed atapproximately 2336ESTandPen.203Awasdeclaredoperableatapproximately 2340EST.OnFebruary4,1994,atapproximately 0007EST,P-947wasdeclaredoperable.

Thetransmitter andrackcalibration procedure forchannelP-948wasperformed laterinthedayonFebruary4,andP-948wasdeclaredoperableatapproximately 1536ESTonFebruary4,1994.HRCFORM366A(592)

NRCFORM366A(5-92)US.NUCLEARREGULATORY CQNIISSIOH LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOMBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATIOH COLLECTION REOUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEHENT BRANCH(MNBB7714),U.S.NUCLEARREGULATORY COMMISSION>

WASHIHGTOH, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),

OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNUMBER20500024494--00202LERNUMBER6'YEARSEOUENTIAL REVISIONPAGE3'5!.:;:.'OF i:.;":;1'4 TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)~~>>>>>>>>>>mcgrr~~w~XCwO,.~~~X>>X><<>>~>~,a~,.eocevmOW~yXaxc

..W>>>WZ>ya,.

m>>>,<~.>,s.>>~a~m~yg~.~>>>>>>~P,:i.,.':

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q,i'.;;,.:'f; P';'i';:;.'.

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aHRCFORM366A(5-92)

~~

NRCFORM366A(5-92)U.S.NUCLEARREGULATORY COMMISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOMBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISIHFORMATIOH COLLECTIOH REQUEST:50.0NRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION AHDRECORDSMANAGEMEHT BRANCH(MHBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),

OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNIMBER205000244LERNUMBER6YEARSEQUENTIAL 94--002REVISION02PAGE3-."I."':.-'$~1'-'EXT (Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)C~INOPERABLE STRUCTURES iCOMPONENTS IORSYSTEMSTHATCONTRIBUTEDTOTHEEVENT:NoneD.OTHERSYSTEMSORSECONDARY FUNCTIONS AFFECTED:

are8,wasSI,)~946Engineered SafetyFeaturesthatrelyonCNMTpressureinputsSafetyInjection Actuation (SI),SteamLineIsolation, andContainment SprayActuation (CNMTSpray).Noneofthesefeatureswasaffectedbytheinoperability ofP-947andP-94becauseatnotime,fromJune24,1992,toFebruary4,1994,CNMTpressureatorneartheactuation setpoints (4PSIGfor18PSIGforSteamLineIsolation, and28PSIGforCNMTSprayDuringthisperiod,theredundant channels(forP-947thechannelsareP-945andP-949;forP-948thechannelsareP-andP-950)wereinserviceandwerenottakenoutofserviceunlesstheaffectedbistables wereplacedinthetrippeddt""":,',,E".",X.;:

.V',,';i>jj(i9'),.;!,,

CIP'.".'-':"::."

":-""'!!!""";,:;:

conztz.onj~<e)('0'epr":.;:,,'"'xol-,';::.::.,'aper'axe%'ai'ei:jr,':,,::'sine;>,"::(ji) i;:,:,:::se'concls':

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E.METHODOFDISCOVERY:

Thiseventwasfirstidentified duetotheastuteobservation ofaControlRoomoperatoronJanuary20,1994,whoquestioned aslightdifference inindications forCNMTpressure.

Thesmalldeviation betweenredundant channelswaswithinthetolerance ofMainControlBoardinstrumentation channelchecks.ThemonthlyChannelFunctional TestsandannualChannelCalibrations associated withthesechannels(asrequiredbyTSTable4.1-1forunits¹17and¹25)didnotdetecttheobstructed tubinglineduetothelocationoftheobstruction.

ThesludgewaslocatedbetweenCNMTandtherootisolation valvesforPT-947andPT-948.Theserootisolation valvesareclosedduringperformance ofthenecessary testsandcalibrations, inordertopressurize thevolumebetweenthevalveandthepressuretransmitter.

Thismethodoftestingisconsistent withthedefinition ofChannelFunctional Testing,asdefinedinTS1t7~3~a~ThefactthatthiseventaffectedbothchannelsP-947andP-948wasidentified asaresultoftheinvestigations performed byI&Cpersonnel onFebruary2,1994.NRCFORM366A(5.92)

NRCFORH366A(5-92)U.S.NUCLEARREGULATORY CQHISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOHBNO.3150-0104 EXPIRES5/31/95ESTINATED BURDENPERRESPONSETOCOHPLYWITHTHISINFORNATION COLLECTION REQUEST:50.0HRS.FORWARDCOHHEHTSREGARDING BURDENESTIHATETOTHEINFORHATIOH ANDRECORDSHAHAGEHENT BRANCH(HNBB7714),U.S.NUCLEARREGULATORY COHHISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3110.0104),

OFFICEOFNANAGEHEHT ANDBUDGETWASHINGTON DC20503.FACILITYNAHE1R.E.GinnaNuclearPowerPlantDOCKETHNBER205000244LERHIHIBER6YEARSEQUENTIAL 94--002--REVISIOH02PAGE3TEXT(Ifmorespaceisrequired, useadditional coPIesofNRCForm366A)(17)Amoredetailedreview'ofthearchivedPPCSrecordsofCNMTpressureconcluded thatchannelP-947hadnotresponded tochangesinCNMTpressuresinceJune24,1992,beginning atapproximately 1500EDST.NotethatwhileCNMTpressurechannelP-947ismonitored bythePPCS,channelP-948isnot.Inaddition, PI-948(andalsoPI-946andPI-950)haveascaleof10to200PSIA(absolute pressure).

Bycomparison, PI-947(andalsoPI-945andPI-949)haveascaleof0to60PSIG.ItisassumedthatP-948hadnotresponded tochangesinCNMTpressureforthesameamountoftimeasP-947.F.OPERATORACTION:TheControlRoomoperators observedthatthePI-947readingwasinconsistent onJanuary20,1994,andinitiated aMWR/TR.AfterbothchannelsP-947andP-948werediscovered tobeinoperable, theControlRoomoperators performed emergency restoration procedure ER-INST.1 andplacedtheaffectedbistables inthetrippedcondition.

Subsequently, theControlRoomoperators ensuredthathighersupervision andtheNRCResidentInspector hadbeennotifiedofthisevent.G.SAFETYSYSTEMRESPONSES:

NoneIII.CAUSEOFEVENTA.IMMEDIATE CAUSE:Theimmediate causeoftheeventwasthefailureofP-947andP-948torespondtochangesinCNMTpressureduetoobstruction ofthecommonpressuresensingline.NRCFORH366A(5.92)

NRCFORM366A(5-92)U.S.NUCLEARREGULATORY CO}IIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYQUINO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDIHG BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRANCH(MNBB7714)gUSTNUCLEARREGULATORY COMMISSION>>

l}ASHIHGTON, DC20555-0001 AHDTOTHEPAPERWORK REDUCTION PROJECT(31500104),OFFICEOFMANAGEMENT AHDBUDGETWASHINGTON DC20503.FACILITYNA}lE1R.E.GinnaNuclearPowerPlant.DOCKETNWBER2YEAR0500024494-00202LERNUMBER6SEQUENTIAL REVISIONPAGE3TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)B.INTERMEDIATE CAUSE:Theintermediate causeoftheobstruction ofthecommonpressuresensinglineatPen.203Awasabuildupofcorrosion productsinthisline,whichis1/2inchOD,0.065inchwallthickness, carbonsteeltubing.Thesecorrosion productswerevisuallyexaminedandfoundtobereddishbrown/black incolor,visuallyresembling ironoxidescale.IL'bj,'s;l::.'bu'iaM) j<.,-.".'.e'f.::,.;Cori:.;epiq'ii:.:'.:;'pro'ducts C.ROOTCAUSE:Theunderlying causeofthe,,",:...,",;g>>e:,,g:":f*,:

g,,"::,.:

Calibratian friO-s',,th>>e:,;:;::,::,".Sp'e'ifi'C SenSinglineconfiguration.

Z&Cpersonnel havecali.brated thesetransmitters withawater-filled deadweight testerformanyyears.Theconfiguration ofthetransmitter andsensinglineforv'~<Pen'".::.'-.::.',:,203A prevented thedrainageofallthewateraftercalibration.

Afterthetransmitter wasunisolated aspartofthecalibration process,thetrappedwatertraveleddowntothelowportionofthesensinglienl:ii':.

h>>,>>ea~rlj!R:::i:,

sthvg'A}Amvggv>>>>~hggge~>>gg>>hvg~pg

'va>>>>hghvgv'vgseggg~agvug>>vp'uhv>>AYAH%'&>>&Ah" v>>gev>>>>frigg:A>>vvrgguhvuhpDg>>hvahug&gsh>>hs YAm>>hhug>>A>>>>va+ggvgasgvger gIhae}::ieav>>

eA'~i::,:::.'::::.~~sjMRQ@Perf oihrmanceijlxhn>>rigca'togrp>>'&

regrege'0'a HRCFORM366A(5-92)

NRCFORH366A(5-92).S.NUCLEARREGULATORY CQIIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOMBNO.3150-0104 EXPIRES5/31/95ESTIHATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORHATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORHATION ANDRECORDSMANAGEMENT BRANCH(HNBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(31i0-0104),

OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNINBER2YEAR0500024494LERNUMBER6SEQUENTIAL M--002REVISION02PAGE39;ii,"'OP;:sl%".4I TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)Stagnantwaterhaerema'ined inthecarbonsteelsensing~ee5'hajj'i;:,':,':;4'0'i:.':,:.:Pjyi>><i203)";

forasubstantial periodoftimea,f'5ejgje'ajh col'fbi'i%iixi.

Underetteh'thp'seconditions, significant, corrosion ofthecarbonsteelmaterial8ecvieid.

Thecorrosion product,hydratedironoxide(commonrust)"'is voluminous, occupying manytimesthevolumeofthemateriallosttothecorrosion process.Sufficient corrosion productaccumulated toblockthesensinglinetubing,resulting intheinoperability ofP-947andP-948.IV.ANALYSISOFEVENTThiseventisreportable inaccordance with10CFR50.73,LicenseeEventReportSystem,item(a)(2)(i)(B),whichrequiresareportof,"Anyoperation orcondition prohibited bytheplant'sTechnical Specifications".

CNMTpressurechannelsP-947andP-948wereinoperable foraconsiderable lengthoftime,co'n~yjj,'

~iBci,':qth eiIragiji'eaM~rei ofTsTable3.5-2,unitsgl.b.,2.b.,andf.c.Operation i'iscondition sinceJune24,1992isacondition prohibited byTS.Anassessment wasperformed considering boththesafetyconsequences andimplications ofthisevent.Theresultsofthisassessment arethattherewerenooperational orsafetyconsequences orimplications attributed totheinoperability ofP-947andP-948because:oAreviewofplanthistoryandpreventive maintenance historyfileshasshownthattheredundant CNMTpressurechannels(P-945,P-946,P-949,andP-950)havebeeneitheroperableorplacedintheconservative trippedstatefromtheEventdatetotheDiscovery date,-':::,i,.'::except:";,:,:::if i:.,'priaOp3Xrima'tel y~ii'iiii's

.S;:;a!88'Cend8!'iOnliiDracenb'sr-'."i".25'p

.:.i'2:,"'.

oAreviewofPPCSdatahasshownthattheredundant pressurechannelshaveresponded topressurization ofthesensinglinesandpressurechangesinCNMT.IV'i'sualgirn,epgot3cne."

O'OCIFSilSC'e'p,

'.:4548tothesamefailuremodeasP-947andP-948.NRCFORH366A(5-92)

NRCFORM366A(5.92)U.SNUCLEARREGULATORY CQIIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOMBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION AHDRECORDSMANAGEMENT BRANCH(MNBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),

OFFICEOFMANAGEMENI'ND BUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNUMBER205000244YEAR94LERNUMBER6SEQUENTIAL

--002-REVISION02PAGE3'30i~O,F,,":::::3'4:

TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)oThe2outof3logi'c(2/3)requiredforactuation ofSIwasreducedtoa2/2logicwiththeinoperability ofP-947.ThusSIactuation fromhkghCNMTpressure(4PSIG)wouldhaveoccurredasassumedinthedesignbasis.0Thediverseactuation circuitry forSIhasthreeadditional meansofactuation (steamgenerator lowsteampressure, pressurizer lowpressure, andManual).Noneofthesediversemeanswasaffectedbytheinoperability ofP-947.oThe2/3logicrequiredforSteamLineIsolation actuation wasreducedtoa2/2logicwiththeinoperability ofP-948.pressure(18PSIG)wouldhaveoccurredasassumedinthedesignbasis.oThediverseactuation circuitry forSteamLineIsolation hasthreeadditional meansofactuation (hi-histeamflowwithsafetyinjection, histeamflowand2/4lowTavgwithsafetyinjection, andManual).Noneofthesediversemeanswasaffectedbytheinoperability ofP-948.oThe2/3plus2/3logicrequiredforCNMTSprayactuation wasreducedtoa2/2plus2/2logicwiththeinoperability ofP-947andP-948':",:::exceptor.,':.'.:':,".approx';.mate1y,;".:;nine'!3'(9)j:",.,"second's:

wCvWayC...

;'.Pj.V:;'P'5mVN'+'.WNNRv..::+9~~"%Xv."V Nw."$"w)~.Ã>O'4'Wr>.a~v.~&(i:)).,w

iw'%4iN5'gN'V'WC

'Op'.-:;:(pe'C'ember:;:.:'.;:,:24'j'"::.-,,'-:',1'9924 Thus,CkfMTSprayactuation'from

~h-CNNTpressuie(28PSIG)wouldhaveoccurredasassumedinthedesignbasis.oThealternate actuation circuitry forCNMTSpray(Manual)wasnotaffectedbytheinoperability ofP-947andP-948.HRCFORM366A(5-92)

NRCFORM366A(5-92)U.SNUCLEARREGULATORY CQBIISSIOH LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYOMBNO.3150-0104 EXPIRES5/31/95IESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRANCH(MHBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTOH, DC20555-0001, AHDTOTHEPAPERWORK REDUCTION PROJECT(3150-0104),

OFFICEOFMANAGEMENT ANDBUDGET'WASHIHGTOH DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNNIBER205000244YEAR94LERNUMBER6SEQUENTIAL

--002--REVISION02PAGE3L3~.,:OSCAR,@4c TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)Nvcyplpcpcyp""vyypcCcw'~ypyykvcccccccwvcyyy~...CypvrMCtcpyyy

~w~gCvC:'CpcvppypppyyCpgvyC "CCpycycxwq>w "Cvw".vpwvw,sMw",yy,e>wyc,ypvwy'~sv}vv"vgCyp>wnyyyyyg.~wcyl~".ne~jSX-ai.:uaC'i'onjixsta4ie-@xoig~>enanne'i;:-P,;

I'ccccppy+,,c,

~p.,Cv,av+$CCRjp&%0p'tcwx Ccvpppyvw xvwypepp?'v'p(%vC'?'v.,wpppw "pwp..feyY:..,vyvywc'>.yywA,"vcwC,.%,.vyvc'.vpp',r',~yy,

'>:;cyA,"v>pavedciw7wkine':<:;..'9:::.,".,s'i5~6n'~iiY 8r'voa'e'I,c()n,'i

':()n:,"'"'"VNSNh~~vccyNQRhfpMc4MxL'(&cvc'Cvykckc@c~

HRCFORM366A(5-92)

NRCFORH366A(5-92)U.S.NUCLEARREGULATORY C(NNISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYINIBNO.3150-0104 EXPIRES5/31/95ESTIHATED BURDENPERRESPONSETOCOHPLYWITHTHISINFORHATION COLLECTION REQUEST:50.0HRS~FORWARDCONHENTSREGARDING BURDENESTINATETOTHEINFORHATIOH ANDRECORDSHANAGEMEHT BRANCH(HHBB7714),U.S.NUCLEARREGULATORY COHHISSIOH, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),

OFFICEOFHANAGEHENT ANDBUDGETWASHINGTON DC20503.FACILITYHAHE1DOCKETNIMBER2YEARLERNlMBER6)SEQUENTIAL REVISIOHPAGE3R.E.GinnaNuclearPowerPlant0500024494--002--02TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)rN:~".--:Basedontheabove,itcanbeconcluded thatthepublic'shealthandsafetywasassuredatalltimes.V.CORRECTIVE ACTIONA.ACTIONTAKENTORETURNAFFECTEDSYSTEMSTOPRE-EVENT NORMALSTATUS:oTheironoxidescale-was removedfromtheobstructed penetration sensinglineandP-947andP-948wererestoredtooperablestatus.oTheotherchannelsthatmonitorCNMTpressurewereverifiedtorespondtosmallchangesinCNMTpressure.

HRCFORH366A(5-92)

NRCFORH366A(5-92).S.NUCLEARREGULATORY C(HIIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYQQNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOHPLYWITHTHISINFORMATION COLLECTION REOUEST:50.0HRS.FORWARDCOHHENTSREGARDIHG BURDENESTIHATETOTHEINFORHATIOH ANDRECORDSMANAGEHENT BRANCH(MHBB7714),U.S.NUCLEARREGULATORY COHHISSION, WASHINGTON, DC20555-0001 AHDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),

OFFICEOFMANAGEMENT AHDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNQIBER205000244YEAR94-00202LERNIMBER6SEOUENTIAL REVISIONPACE3ljig?'g'OP>:i,'s'.'>g'cg TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)B.ACTIONTAKENORPLANNED'O PREVENTRECURRENCE:

oPPCScomputerpointsforCNMTpressurewillbearchiveddailyuntilthe1994refueling outagetoverifychannelvVvvI)oThesensinglinesforallCNMTpressurechannelswillbeinsectedandcleanedoutduringthe1994refueling outage.oThemethodofcalibration oftheCNMTpressuretransmitters hasbeenchangedtousegas(insteadofwater)asthetestccQ~w&4~?v'wccggcg~ccc~

ccccv?+wvYp~v?ccw???v?c?vsNvccvc.'i.

"(pY."wp&c?vv?v54<r"

'v,cvcvgmedium.?"ese::,xe'vms'ea:-:,:;,::proc'e'dUxe's.:;:::'.::vere'..::..u'si'd!-'.'to:;'::,per'for'ia prai~rit'i~i::::;i'IIc m~:rancp';!

"'"'*""'"""'""""=""oTestingthesecontainment penetrations hasbeenenhancedtoincludeformaldocumentation o'fpressurechannelresponse.>~:

e'kaid'~~b8inh"::~ins.i i','.i,""'epC'os't'a3'.:

HRCFORH366A(5-92)

NRCFORM366A(5-92)U.S.NUCLEARREGULATORY CQHIISSIONLICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBY(HLBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTIOH REQUEST:50'HRS.FORWARDCOMMENTSREGARDIHG BURDENESTIMATETOTHEINFORMATION ANDRECORDSMAHAGEMENI'RANCH (MHBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001, ANDTOTHEPAPERWORK REDUCTION PROJECT(3150-0104),

OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNINBER205000244LERNUMBER6YEARSEQUENTIAL 94-002REVISION02PAGE3m~"~O~~"~4TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)VI.ADDITIONAL INFORMATION A.FAILEDCOMPONENTS:

Therewerenofailedcomponents.

Theobstructed sensinglineis1/2inchOD,0.065inchwallthickness, carbonsteeltubing.Information aboutthevendorandmanufacturer isnotrelevanttothisevent.B.PREVIOUSLERsONSIMILAREVENTS:AsimilarLEReventhistorical searchwasconducted withthefollowing results:LER92-003wasalsoaneventcausedbyanobstructed pressuresensingline.However,theobstruction wascausedbybuildupofsludgefromnormalimpurities intheprocessfluid(feedwater).

Theobstruction referredtoinLER94-002wascausedbycorrosion fromtheinteraction ofthetestmediumandthesensinglinematerials.

C.SPECIALCOMMENTS:

NoneHRCFORM366A(5-92)

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