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

ACCELERATED DISTRIBUTION DEMONSTRATION SYSTEMREGULATORY INFORMATION DISTRIBUTION SYSTEM(RIDS)ACCESSION NBR:9405090121 DOC.DATE:

94/05/02NOTARIZED:

NODOCKETFACIL:50-244 RobertEmmetGinnaNuclearPlant,Unit1,Rochester G05000244AUTH.NAMEAUTHORAFFILIATION ST.MARTIN,J.T.

Rochester Gas&ElectricCorp.MECREDY,R.C.

Rochester Gas&ElectricCorp.RECIP.NAME RECIPIENT AFFILIATION RJOHNSONIAR~ProjectDirectorate I-3D-S.A0500024.4

.DNOTES:License Expdateinaccordance with10CFR2,2.109(9/19/72).

SUBJECT:

LER94-022-01:on 940202,determined thatContainment PressurechannelsP-947&P-948wereinoperable.

Causedbyobstruction ofcommonpressuresensingline.Corrective action:iron oxidescalewasremoved&channelsdeclaredoperable.W/940502 ltr.DISTRIBUTION CODE:IE22TCOPIESRECEIVED:LTR fENCLISIZETITLE:50.73/50.9 LicenseeEventReport(LER),IncidentRpt,etc.RECIPIENT IDCODE/NAME PD1-3PDINTERNAL:

AEOD/DOAAEOD/ROAB/DSP NRR/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/TPABNRR/DE/EELB NRR/DORS/OEAB NRR/DRCH/HICB NRR/DRIL/RPEBNRR/DSSA/SPLB EGEIL~02GÃ1FILE01LSTLOBBYWARDNSICMURPHY,G.A NUDOCSFULLTXTCOPIESLTTRENCL1111111111111111111111111D'S."'R25'ets/0205DNOTETOALL"RIDS"RECIPIENTS:

PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESKROOMPl-37(EXT.20079)TOELIMINATE YOURNAMEFROMDISTRIBUTION LISTSFORDOCUMENTS YOUDON'TNEED!FULLTEXTCONVERSION REQUIREDTOTALNUMBEROFCOPIESREQUIRED:

LTTR27ENCL27 ROCHESTER GASANDELECTRICCORPORATION 489EASTAVENUE,ROCHESTER MY.14849-0001 uf8rosestartROBERTCAtECREDYVicePresident CinnaNuclearProduction TEl.EPHONE AREACOOE71d5462700May2,1994U.S.NuclearRegulatory Commission DocumentControlDeskAttn:AllenR.JohnsonProjectDirectorate 1-3Washington, DC20555

Subject:

LER94-022,Rev'isLor~f,::,

Containment PressureTransmitters Inoperable DuetoBlockageofSensingLinebyCorrosion

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

theattachedLicenseeEventReportLER94-002,Revlstoit'::,::,'1::,

isherebysubmitted.

nis'ci',::!rn'oI'u'ds'd"rn'!titrs'"'reycIs'io'ri;::

ssYi&n~cvsrncv~:srasrtsssw Thiseventhasinnowayaffectedthepublic'shealthandsafety.Verytyyours,RobertC.Mecreyc:U.S.NuclearRegulatory Commission RegionI475Allendale RoadKingofPrussia,PA19406GinnaSeniorResidentInspector 8rQzP7+w/wA~~94050'70121

'F405020~G0A0PDRADOCK05000244SPDR NRCFORM366(5-92).S.NUCLEARREGULATORY COIIIISSION PROVEDBYOMBNO.3150-0104 EXPIRES5/31/95LICENSEEEVENTREPORT(LER)(Seereverseforrequirednumberofdigits/characters foreachblock)ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTIOH REQUEST:50.0MRS.FORWARDCOMMENTSREGARDIHG BURDEHESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRANCH(MNBB7714)eUS~NUCLEARRECUtATORYCOMMISSIOHe WASHINGTOH, DC20555.0001 AHDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),

OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FAclLITYNAME(1)R.E~GinnaNuclearPowerPlantDOCKETNQGIER(2)05000244PAGE(3)1OFQTITLE(4)Containment PressureTransmitters Inoperable, DuetoBlockageofSensingLinebyCorrosion

Products, CausesaCondition Prohibited byTechnical Specifications MONTHDAYYEARYEAREVEHTDATE5LERNINBER6SEQUENTIAL HUHBERREVISIOHNUMBERMONTHDAYYEARREPORTDATE7OTHERFACILITIES INVOLVED8DOCKETNUMBERFACILITYNAME02029494--002--FACILITYNAMEDOCKETNUMBEROPERATING IKXIE(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,NRCForm366ATHISREPORTISSUBMITTED PURSUANTTOTHEREQUIREMENTS OF10CFR:Checkoneormore11NAMEJohnT.St.Martin-Director, Operating Experience TELEPHONE NUMBER(IncludeAreaCode)(315)524-4446C(NPLETEONELINEFOREACHCNIPOHENT FAILUREDESCRIBED INTHISREPORT13CAUSESYSTEHCOMPOHEHT MANUFACTURER REPORTABLE TOHPRDSCAUSESYSTEMCOMPOHENT MANUFACTURER REPORTABLE TOHPRDSSUPPLEMENTAL REPORTEXPECTED14YES(lfyes,completeEXPECTEDSUBMISSIOH DATE).XxoEXPECTEDSUBMISSION DATE(15)MONTHDAYYEARABSTRACT(Limitto1400spaces,i.e.,approximately 15single-spaced typewritten lines)(16)OnFebruary2,l994,atapproximately 1642EST,withthereactoratapproximately 984steadystatepower,ControlRoomoperators determined thatContainment PressurechannelsP-947andP-948wereinoperable.

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

Immediate corrective actionwastodefeat.theinoperable channelsbyplacingtheaffectedbistables inthetrippedcondition.

Theunderlying causeoftheeventwasanobstruction inthecommoncontainment pressuresensinglineforp-947andP-948~!pipiulti rigoiasat~ax':hiing jt:aprpjeid~n:aQa'mi.;il:p'oa"'nti!o&6~i'a,-!1>hei,::p.".;:.%hisyen FeriYiimano'eI'ndiaoeatoexi'-:e!p'ro'gr'a m""cpan'set'i'c'8ii'ioi!a'."4)8@!'

""Corrective actionwastakentocleartheobstruction fromtheaffectedtubing,leaktestthepenetration pipingandtransmitter tubing,andverifytheproperoperation ofP-947andP-948.Corrective actiontoprecluderepetition isoutlinedinSectionV(B).NRCFORM366(5-92)

NRCFORM366A(5-92)U.SNUCLEARREGULATORY CQIIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDB'YCNSNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTIOH REQUEST:50.0MRS.FORWARDCOMMENTSREGARDIHG BURDENESTIMATETOTHEINFORMATION AHDRECORDSMANAGEMENT BRANCH(MHBB/l'14),U.S.NUCLEARREGULATORY COMMISSION, WASHIHGTOH, DC20555-0001 AHDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),

OFFICEOFMANAGEMENT AHDBUDGETWASHIHGTOH DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNINBER205000244LERNUMBER6SEQUENTIAL REVISION94-002--PAGE32OF9'EXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)PRE-EVENT PLANTCONDITIONS Theplantwasatapproximately 989steadystatereactorpowerwithnomajoractivities 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)

NRCFORH366A(5-92)U.S.NUCLEARREGULATORY (XNIIISSIOH LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOHBNO.3150-0104 EXPIRES5/31/95ESTINATED BURDENPERRESPOHSETOCOHPLYWITHTHISIHFORHATIOH COLLECTIOH REOUEST:50.0HRS.FORWARDCOHHENTSREGARDING BURDENESTIHATETOTHEINFORHATION ANDRECORDSHANAGEHEHT BRANCH(NNBB7714),U.S.NUCLEARREGULATORY CONHISSIOH, WASHINGTON, DC20555-0001 AHDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),

OFFICEOFNANAGENENT ANDBUDGETWASHINGTON DC20503.FACILITYNAKE1R.E.GinnaNuclearPowerPlantDOCKETNWBER205000244LERNIMBER6TEARSEQUENTIAL 94--002--REVISIONPAGE3013OF9':4TEXT(Ifmorespaceisrequired, useadditionat copiesofNRCForm366A)(17)B.EVENT:OnJanuary20,1994,ControlRoomoperators observedthatoneMainControlBoardindication forCNMTpressure, PI-947,wasreadingslightlylowerthantheothertwoindicators, PI-945an'dPI-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 989.steadystatereactorpower,ControlRoomoperators declaredchannelP-947inoperable.

Theaffectedbistables wereplacedinthetrippedcondition.

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

I&Cpersonnel monitored test,pointsforCNMTpressurechannelsP-945,P-947,P-948,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.HRCFORH366A(5-92)

NRCFORM366A(5.92)US.NUCLEARREGULATORY COHIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYOMBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDIHG BURDENESTIMATETOTHEINFORMATION AHDRECORDSMANAGEMENT BRANCH(MNBB7714),U.S.NUCLEARREGUI.ATORY COMMISSION, WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(31/0.0104),

OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYlOWE1R.E.GinnaNuclearPowerPlantDOCKETNUMBER205000244LERNUMBER6YEARSEQUENTIAL 94-002REVISION01PAGE34OFm!4TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(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,butthiswaterwasnot'hesourceoftheblockage.

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(5-92)

NRCFORM366A(5-92)US.NUCLEARREGULATORY CQOIISSIOH LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBYQUINO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FOR'WARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION ANDRECORDSMAHAGEMENT BRANCH(MHBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001, ANDTOTHEPAPERWORK REDUCTION PROJECT(3150-0104),

OFFICEOFMANAGEMENT AHDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNUMBER205000244YEAR94-002--01LERNUMBER6SEQUENTIAL REVISIONPAGE3TEXT(Ifmorespaceisrequired, useadditionat copiesofHRCForm366A)(17)'AA'~L':::LnIHT.:::i:,.yz',as sana!::,::@hanna 1s,.'::.~flu hy'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.NUCLEARREGULATORY C(NIIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYQGINO.3150-0104 EXPIRES5/31/95ESTINATED BURDENPERRESPOHSETOCOHPLYWITHTHISIHFORMATIOH COLLECTION REQUEST:50.0HRS.FORWARDCOHHENTSREGARDING

'BURDENESTIHATETOTHEINFORHATIOH ANDRECORDSHANAGEHENT BRANCH(HNBB7714)aUSTNUCLEARREGULATORY COHHISSIOHa WASHINGTON, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(3150-0104),

OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYNAHE1R.E.GinnaNuclearPowerPlantDOCKETNIMBER205000244LERNUMBER6YEARSEQUENTIAL 94-002--REVISIOH01PAGE3LR~:<MTEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)C.INOPERABLE STRUCTURES gCOMPONENTS gORSYSTEMSTHATCONTRIBUTEDTOTHEEVENT:NoneD~OTHERSYSTEMSORSECONDARY FUNCTIONS AFFECTED:

Engineered SafetyFeaturesthatrelyonCNMTpressureinputsareSafetyInjection Actuation (SI),SteamLineIsolation, andContainment SprayActuation (CNMTSpray).Noneofthesefeatureswasaffectedbytheinoperability ofP-947andP-948,becauseatnotime,fromJune24,1992,toFebruary4,1994,wasCNMTpressureatorneartheactuation setpoints (4PSIGforSI,18PSIGforSteamLineIsolation, and28PSIGforCNMTSpray).Duringthisperiod,theredundant channels(forP-947thechannelsareP-945andP-949;forP-948thechannelsareP-946andP-950)wereinserviceandwerenottakenoutofserviceunlesstheaffectedhistahles wereplacedinthetripped""'"i,::,:::::::i..":...:.',9,,

',:,.%,::.:i!:-.'.I'P,.::.',":,':.'.:,,:.:%:::::",:::::".:

'",:,ll<:::,:i!i~>','-'-

.".i'ecan>+<-".::!

><'i'"happ:.>'l' METHODOFDISCOVERY:

Thiseventwasfirstidentified duetotheastuteobservation ofaControlRoomoperatoronJanuary20,1994,whoquestioned aslightdifference inindications forCNMTpressure.

Thesmalldeviation betweenredundant channelswaswithinthetolerance ofMainControlBoardinstrumentation channelchecks.ThemonthlyChannelFunctional TestsandannualChannelCalibrations associated withthesechannels(asrequiredbyTSTable4.1-1forunitsf17andf25)didnotdetecttheobstructed tubinglineduetothelocationoftheobstruction.

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

Thismethodoftestingisconsistent withthedefinition ofChannelFunctional Testing,asdefinedinTS1.7e3~a.ThefactthatthiseventaffectedbothchannelsP-947andP-948wasidentified asaresultoftheinvestigations performed byI&Cpersonnel onFebruary2,1994.HRCFORH366A(592)

NRCFORM366A(592)U.SNUCLEARREGULATORY CQOIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYQIBNO.'150-0104 EXPIRES5/31/95ESTIMATED BURDEHPERRESPOHSETOCOMPLYMITHTHISINFORMATION COLLECTION REGUEST:50.0MRS.FORHARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRAHCH(MNBB7714),U.S.NUCLEARREGULATORY COMMISSION, NASHINGTOH, DC20555-0001 ANDTOTHEPAPERIIORK REDUCTION PROJECT(3140-0104),

OFFICEOFMANAGEMENT ANDBUDGETIlASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNINBER20500024494--002--01LERHINBER6YEARSEQUENTIAL REVISIGHPAGE3,:;O~P:"jX4TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)AmoredetailedreviewofthearchivedPPCSrecordsofCNMTpressureconcluded 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.NRCFORM366A(5-92)

KRCFORM366A(5.92)U.S.NUCLEARREGULATORY CQIIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION APPROVEDBY(HUINO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISIHFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOMMENTSREGARDING BURDENESTIHATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRANCH(MHBB7714),U.STNUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001, AHDTOTHEPAPERWORK REDUCTION PROJECT(31500104),OFFICEOFMAHAGEMEHT ANDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNWBER2YEAR05000244g4LERHINBER6SEQUENTIAL

--002--REVISION01PAGE3TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)B.INTERMEDIATE CAUSE:C.Theintermediate causeoftheobstruction ofthecommonpressuresensinglineatPen.203Awasabuildupofcorrosion productsinthisline,whichis1/2inchOD,0.065inchwallthickness, carbonsteeltubing.Thesecorrosion productswerevisuallyexaminedandfoundtobereddishbrown/black incolor,visuallyreSembling iranOXideSCale.ThiiS!h'in!idpe!~Cia:;:,":':,,:

Crctrrcwan caprdciiCtS"""""""."e"4'"'~'"""'i""'i"""ROOTCAUSE:Theunderlying causeofthemso,,~t:-:,"'ii}h:::",ii-:':::,I:::::

-ei'k!:configuration.

I&Cpersonnel havecali.'b'rated thesetransmitters withawater-filled deadweight testerformanyyears.Theconfiguration ofthetransmitter andsensinglinefi+r~'Pe'ri:".",y-,20)'A prevented thedrainageofallthewateraftercalibsraf:ion.

Afterthetransmitter wasunisolated aspartofthecalibration process,thetrappedwatertraveleddowntothelowportionofthesensinglineP!:.:;'::!w hereityataje'djunJ'i~1!,PV'aPorati g,",nr".:.,"::

P(ejrCmtjng fQC1HRCFORM366A(5-92)

NRCFORM366A(5-92)U.S.NUCLEARREGULATORY CQIIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYMSNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTIOH REQUEST:50.0HRS~FORWARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRANCH(MHBB7714),U.S.NUCLEARREGULATORY COMMISSIONS WASHINGTOH, DC205550001ANDTOTHEPAPERWORK REDUCTION PROJECT(31800104),OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNINBER20500024494--002--01LERNUMBER6YEARSEQUENTIALREVISIONPAGE3/god!1'4'EXT (Ifmorespaceisrequired, useadditional copiesotNRCForm366A)(17)Stagnantwaterhaeremainedinthecarbonsteelsensinq~ee5"Ape".LCD~!Pj~T}..-:-.,:20gh" forasubstantial periodoftimee'fter'.,',":;::.:e'i'4~3-:i~bditi'OiP.

Unctereach~th'i'i'5 conditions, significant"corrosion ofthecarbonsteelmaterialoeeuiii'5.

,Thecorrosion product,hydratedironoxide(commonrust)isvoluminous, 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,contr'O'Vg 5~c))::,th'i".~~reqYi';x".ime~nt,

-ofTSTable3.5-2,unitsg1.b.,2.b.,and5".c.OperaTion intlii.scondition 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 trippedstatefromtheEventdtetotheDiscovery date~@'exieptl:,'go~rgajproYYimate'3/<i,njn'e i(,,i)g':i,:i,oAreviewofPPCSdatahasshownthat.theredundant pressurechannelshaveresponded topressurization ofthesensinglinesandpressurechangesinCNMT.9gsg'a'1;:@Tl'SjiCti~()n8 hah~>8iiS'pe

'.04M'itothesamefailuremodeasP-947andP-948.~Wi"'""'"RvkN4K6M HRCFORM366A(5-92)

NRCFORH366A(5.92)U.S.NUCLEARREGULATORY CQOlISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBY(NBNO.3150-0104 EXPIRES5/31/95ESTIHATED BURDENPERRESPONSETOCOMPLYWITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORWARDCOHMEHTSREGARDING BURDENESTIHATETOTHEINFORMATION AHDRECORDSHANAGEHEHT BRANCH(HHBB7714),U.S.NUCLEARREGULATORY COMMISSIONS WASHIHGTOH, DC20555-0001 ANDTOTHEPAPERWORK REDUCTION PROJECT(31/0.0104),

OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYNAME1DOCKETHINBER2LERHINBER6SEQUENTIAL REVISIONPAGE3R.E.GinnaNuclearPowerPlant0500024494--00200Al9843,4TEXT(lfmorespaceisrequired, useadditional copiesofHRCForm366A)(17)00The2outof3logic(2/3)requiredforactuation ofSIwasreducedtoa2/2logicwiththeinoperability ofP-947.ThusSIactuation fromh&phCNMTpressure(4PSIG)wouldhaveoccurredasassumedinthedesignbasis.Thediverseactuation circuitry forSIhasthreeadditional meansofactuation (steamgenerator lowsteampressure, pressurizer lowpressure, andManual).Noneofthesediversemeanswasaffectedbytheinoperability ofP-947.0The2/3logicrequiredforSteamLineIsolation actuation wasreducedtoa2/2logicwiththeinoperability ofP-948.pressure(18PSIG)wouldhaveoccurredasassumedinthedesignbasis.0Thediverseactuation circuitry forSteamLineIsolation hasthreeadditional meansofactuation (hi-histeamflowwithsafetyinjection, histeamflowand2/4lowTavgwithsafetyinjection, andManual).Noneofthesediversemeanswasaffectedbytheinoperability ofP-948.0The2/3plus2/3logicrequiredforCNMTSprayactuation wasreducedtoa2/2plus2/2logicwiththeinoperability ofp-947ahdp-948K~!"exaej%i:,:,:::,ga~Tapprpkiiaats1p~in'i'iie'-.::+9),"

secchdsIYe9hCHI4Tpressure(28PSIG)wouldhaveoccurredasassumedinthedesignbasis.0Thealternate actuation circuitry forCNMTSpray(Manual)wasnotaffectedbytheinoperability ofP-947andP-948.NRCFORM366A(592)

NRCFORM366A(5-92)U.S.NUCLEARREGULATORY CQIIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATZON APPROVEDBTQU!NO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPOHSETOCOMPLYWITHTHISINFORMATION COLLECTIOH REQUEST:50.0HRS.FORWARDCOMMENTSREGARDIHG BURDENESTIMATETOTHEINFORMATION AHDRECORDSMANAGEMENT BRANCH(MHBB7714),U.S.NUCLEARREGULATORY COMMISSION, WASHINGTON, DC20555-0001 AHDTOTHEPAPERWORK REDUCTION PROJECT(3140-0104),

OFFICEOFMANAGEMENT ANDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNIHIBER205000244LERNUMBER6YEARSEQUENTIAL 94-002--REVISION01PAGE3TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(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.NUCLEARREGULATORY COHISSIOH LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYQQHO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYMITHTHISINFORMATION COLLECTION REOUEST:50.0HRS.FORNARDCOMMENTSREGARDING BURDENESTIMATETOTHEINFORMATION ANDRECORDSMANAGEMENT BRANCH(HNBB7714),U.S.NUCLEARREGULATORY COMMISSIDH, MASHIHGTOH, DC20555-0001 AHDTOTHEPAPERNORK REDUCTION PROJECT(3140-0104),

OFFICEOFMANAGEMENT ANDBUDGETllASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETHNBER205000244YEAR94LERNUMBER6SEQUENTIAL

--002REVISION-01PAGE3TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(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,itcanbeconcluded thatthepublic'shealthandsafetywasassuredatalltimes.V.CORRECTIVE ACTIONA.ACTIONTAKENTORETURNAFFECTEDSYSTEMSTOPRE-EVENT NORMALSTATUSoTheironoxidescalewasremovedfromtheobstructed penetration sensinglineandP-947andP-948wererestoredtooperablestatus.oTheotherchannelsthatmonitorCNMTpressurewereverifiedtorespondtosmallchangesinCNMTpressure.

HRCFORH366A(5-92)

NRCFORM366A(5-92)U.S.NUCLEARREGULATORY CQIIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBY(HNINO;3150-0104 EXPIRES5/31/95ESTIMATED BURDEHPERRESPONSETOCOMPLYIIITHTHISINFORMATION COLLECTIOH REQUEST:50.0HRS.FORllARDCOMMENTSREGARDIHG BURDENESTIMATETOTHEIHFORMATIOH ANDRECORDSMANAGEMENT BRANCH(MHBB7714)4USTNUCLEARREGULATORY COMMISSION?

llASHINGTON, DC20555-0001 ANDTOTHEPAPERNORK REDUCTION PROJECT(3110-0104),

OFFICEOFMANAGEMENT AHDBUDGETWASHINGTON DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETNIMBER20500024494--002--01LERNUMBER6'YEARSEQUENTIAL REVISIONPAGE3TEXT(Ifmorespaceisrequired, useadditional copiesofHRCForm366A)(17)B.ACTIONTAKENORPLANNEDTOPREVENTRECURRENCE:

oPPCScomputerpointsforCNMTpressurewillbearchiveddailyuntilthe1994refueling outagetoverifychanneloperability.

pl?CSScoa?putana;:-":;rior'ntsi'::fur,C,H::,,:MTSpr'sss urrsiieere oThesensinglinesforallCNMTpressurechannelswillbeinspected andcleanedoutduringthe1994refueling outage.oThemethodofcalibration oftheCNMTpressuretransmitters hasbeenchangedtousegas(insteadofwater)asthetest...e?sas4?999??an?

~~i..."vmmu?m,.

znSSrr....",??4;49?S?'as.ye.

rate....,44rs"',y; 4'?w'ia4ssSSS<cc s'?9~'rRmedium.a.'ipse',~i',.e',vase'cIj',pros'cveau'r'ea",s',::.';

gPreVpht;i'TIE+'EiI'cui',.:renice;.:I oTestingthesecontainment penetrations hasbeenenhancedtoincludeformaldocumentation ofpressurechannelresponse.m HRCFORM366A(5-92)

NRCFORM366A(5-92)U.S.NUCLEARREGULATORY CQIIISSION LICENSEEEVENTREPORT(LER)TEXTCONTINUATION PROVEDBYIHIBNO.3150-0104 EXPIRES5/31/95ESTIMATED BURDENPERRESPONSETOCOMPLYNITHTHISINFORMATION COLLECTION REQUEST:50.0HRS.FORMARDCOMHEHTSREGARDING BURDENESTIMATETOTHEINFORMATIOH ANDRECORDSMANAGEMENT BRANCH(MNBB7714),U.S.NUCLEARREGULATORY COMMISSION, llASHIHGTOH, DC20555-0001 AHDTOTHEPAPERIIORK REDUCTION PROJECT(31400104),OFFICEOFMANAGEMENT AHDBUDGETNASHIHGTOH DC20503.FACILITYNAME1R.E.GinnaNuclearPowerPlantDOCKETHWBER2YEAR0500024494LERNUMBER6SEQUENTIAL

-002REVISION01PAGE3~~"~":"'~F~>"4 TEXT(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)