ML17255A520

Rev 3 to Procedure M-32.2, DB-50 Reactor Trip Circuit Breaker Insp,Maint & Test.

ML17255A520
Person / Time
Site:	Ginna
Issue date:	10/05/1983
From:	ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17255A515	List: ML17255A514 ML17255A516 ML17255A517 ML17255A518 ML17255A519 ML17255A520
References
M-32.2, NUDOCS 8311150379
Download: ML17255A520 (27)

Text

ATTACHMENT5ROCHESTERGASANDELECTRICCORPORATIOQtXN~SY<V~ONUNljgfCOMPLETEDSATE:-TtME:-GINNASTATIONCONTROLLEDCOPYNDMBERPROCEDURENO.M-32.2REV.NO.3DB-58REACTORTRIPCIRCUITBREAKERIVASPECTIONVEMAINTENANCEANDTESTTECHNICALREVIKfPORCREVIENDATEOC27EB'EVIEWPLANSPINTENDENTOCT5j983EFFECTIVEDATEQA4iVON-QACATEGORY1.0REVIEWEDBY:THISPROEDURECONTAINS6PAGES+ATTACHMENTS83iii5037983ii04PDRADOCK,05000244,P'"DR 4

M-32':1M-322DB-58REACTORTRIPCIRCUITBREAKERINSPECTION,MAINTENANCEANDTESTPURPOSE:Toperforminspebl.on,maintenanceandtestofDB-58ReactorTripandReactorTripBypassBreakers.

2.8REFERENCES

2.12'NestinghouseswitchgeardivisioninstructionbookZB-33-953-3CinstructionsforDB-59,DBF-loandDBL-58aircircuitbreakers.fwestinghouseTechnicalBulletinVSD-TB-B3-82,datedMarch24,1983.3'INITIALCONDITIONS:"lotifyQCpriortostarting.Anyphaseofplantoperations.ThShiftSupervisorandHeadControlOperatorshallbenotifiedjustpriortoanyinspectionorma'tenancont¹reactortripsystem.ShiftSupervisorHeadControlOperator4.RPRECAUTIONS:4.14~2Obtainpaxtsorsuppliespex%-831.Lubricationofbreakermechanicalbearingpointsistobeappliedsparingly,ifnecessary,usingND-49usingcautiontoassuxethatdustandcontaminationinotherformareremovedpriortoax3plying.

M-32':25.8INSTRUCTIONS-5.1Indicatehereandonfrontcoverofprocedurethebreakertobeworkedon.N/Aotherspacesnotrequired.Bypass5~2Removefromservice.5~2~1Atpower(markN/Aifnotatpower).5.2~1~1EstablishcommunicationsbetweenControlRoom,RelayRoom,andReactorTripBreaker.5~2~1~2Electriciansplacereactortripbypassbreakerintopositiontobypassbreakerundergoingmaintenance,andrackintothe"FullyRackedIn"position.Verifythat28ASTand28ETindicatinglightsareilluminatedatbreakerpanel.5.2.1.3"Close"By-passBreakerbyactuationofresetpushbuttoneaVerifythat28ASTand28ETindicatinglightsareNOTilluminated.5.2.1.4"Trip"By-passBreakerbyactuationofpushbuttontripswitchinreactorlogictestcabinetoythe~oositetrain.Verifythat28ASTand28ETindicatinglightsareilluminated.5.2.1.5"Close"By-passBreakerbyactuationofresetpushbuttonswitch,andverifythat28ASTand28ETindicatinglightsarenotilluminated.5.2.1e6"Trip"ReactorTripBreakertobeworkedonbyactuationofpushbuttontripswitchswitchinthereactorlogictestcabinetforthattrain.5~2.2HoldbreakerinaccordancewithA-1481StationHoldingRules,ifapplicable.5.3Performinspectionofbreakerasfollowsandnoteresultsonthedatasheet:

Z~00 5gal~~Checkforpresenceofdust,dirtandothertypeofforeignsubstancesorcontaminants.5Checkforloose,damaged,brokenordistortedparts.5.3.3Checkforwearorsignsofrubbing.5'.4Verifyclearancebetweenthetriptabandtripperbaronbreakerpositioningattachmentonlefthandsideofbreaker.NOTE=Clearanceshouldbel/8"minto3/16"maxium.consistofwipingwithpapertowelorlintfreeclothsto'removedustanddirt.Insomecases,brushingwithamediumbristleorstiffbristlebrushmaybenecessary..-DoNotuseawirebrush,orhighpressureair.5.4.1~~Vacuumingmaybeutilizedasasubstituteforbrushing.5.4.2Ifstickyorgummysubstancesarepresentamildsolventmaybeused.Applysolventtopapertowelsorlintfreeragsandwipe.DoNotapplysolvent,tocoils,wiresorotherelectricalparts.Avoiduseofspraysolvent.5.4.3Ifcl'eaningwasperformed,reinspectbreakerperstep5.2.5'Performtroubleshootingandmaintenanceasrequiredandnoteworkdoneondatasheet.5~5~lIflubricationofUVAttachmentisconsideredncessary,lubricateusingpropermaterialspointsrequiringlubricationperAttachmentIandII.(flAotherwise)

MaintenanceRelatedTestin5~6~1PerformmanualtestoftheUUAttachment,byde-energizingUVAttachmentbutholdingitintheresetpositionbyatemporaryrestraintontheresetlever,thebreakerisclosed(eithermanuallyorelectrically.)Then,thetemporaryrestraintis~slowlreleased.allowingtheUUAttachmenttoperformthebreakertripfunctionbeforetheresetlevercomestorest.5.6.1.1Monitorforunhesitant,smooth,positive,snap-actionoftheUVAttachmentandbreakertrip,andnoteondatasheet.5.6.1.2Removetemporaryrestraintaftersuccessfulcompletionofthistest.5.6~2Afterinspectionandmaintenance,performafinaloperationalcheck,oftheUVAttachmentandbreakertripactionbyclosingthebreakreithermanuallyorelectrically,thentrippedbyde-energizingoftheUVAttachment.Rpeatthis18timesanddocumentonattacheddatasheet.NOTE=ThisappliestopostmaintenancetestingandisnotassociatedwithPTorESHPtestprocedures.5.6.2.1Thebreakershallbeclosedelectricallyandelectricalbreakertripviashunttripdeviceverifiedatleastonce.'ocumentonattacheddatasheet.5.7NotifyResultsandTestsupervisionofmaintenanceerformedandtheneedtotestthereactortribreakerusingappropriatetestprocedures.5.7.1ResultsandTestsupervisionhasdeterminedtheapplicabletestproceduretobeutilized:(ifnecessary)Applicablestepsofprocedureno.RETSupervision tI40 COMPLETEDBY:DATECOMPLETED:ELECTRICIANFOREi~IAN:RESULTS6TESTSUPERVISION:QCSUPERVISION:POSTPORCREVIEWDATE:

aM-32':6Device:Inspby:Date:MFA:Type+S/m-TypeofInsp:.Annual:Special:*BreakerInspection(MarkCondition)'lignmentlContactsAssemblyI'ondition[AhaseBhaseCahaseAssemblyIA.RCIChutesConditionIPrimarycontactCompressionArcingContactCompressionMakeandBreak(Max.Diff.)Otherwise8/AifnotRequiredlFoundLeft123Acceptable:General:Mainand-SecondaryDisconnectingDevice:Insulators:Cubicle:Allnuts,bolts,cotterpinsandetc.tightandinplace:Connections:Panel:Aux.SN':ClosingRelay:Clearanceoftriptabtotripperbarapprox.clearance1/8"to3/16".UnderVoltaeTripAttachmentFoundLftClearance-Triplevertotripbar.approx.l/16"Clarancewhenthebreakerishalfwayclosed.Testing:ManualtestofUVAttachmentUVoperationverified18timeShunttripoperationverifiedComments:

WestinghouseNuclear~ServiceDivisionTechnicalBulletinM-32.2AttachmentIPagelof3advisorynoticeofarecenttechnicaldevelopmentpertainingtotheinstallationoroperationofWestlnghou~ppliedNucleir~Plantequipment.Recipientsshouldevaluatetheinformationandrecommendation,andinitiateactionwhereappropriate.P.O.Box272$,Pittsburgh,PA15R301NS8-,TB-83-02EoY95dcg~+RAFFwziosfoursicrcSheet3of4@LAZY@ALL.SURFACELdr-CHPIN.8ala.~Z,ARSZQ.'3t7EA~-~1ZPII.ARG'EDYI.EN'8<<<<1'<<<<r<<r<<rrpv1~"~1'I'I'l4r<<rg<<<<~(~1r1~I~~"~~1/rl<<IrN+j)j4~>1eQ+ggWWA~~~rr<<11.<<~C'5rLr1'jfK'j<<~,rn~'~ll~'1~'P1<<,.<<//IAirIrr'..-.;:.:".":-:.;8-4uaaiCA.rZSuarAC.ZS:~~-.'-,"-'-IA'Ol-GATEDkV/7'H;-.;;;;",;.;.-.-'.-:;.':.;:;;:.";;.S3.7arem,SEEEplLARGKO1jev(Ew8'l1I~<<II~r'Iu<<%r1~<<11r~'1~I~%KTlHCHCQJIIlRCiRlCCCLRPORATIOH.0'0:U.'E37/6AG3-,:::;:;.;,':,:,:..'-,'

xC,~g'g M-32.2AttachmentIIPage2of3Westinghouse.NuclearServiceTechnicalBulletinQvrDivisionV~)AnadvisorynoticeofarecenttechnicaldevelopmentpertainingtotheinstallationoroperationofWestinghousaeuppliedNuclearPlantequipment.Recipientsshouldevaluatetheinformationandrecommendation,andinitiateactionwhereappropriate.P.O.Box2728,Pittsburgh,PAt5230NSO-TB-83-02,.E'ONLYSheet4of4FLEDLUDRZCATZOIOFDEERKAggg..UDDCRVDt~TRXFATTACSCS2@bess~iredtlubrieacioaofthaundacvoltagatripattach~toaDgLostvoLtagebreskereshouldbessedowiths370LcsrLubricanci>>ThiaLubricsntLecomposedofuf~mely~dsndpurifiednaturaloreofasslybdeouadisulfide~ndiseproyyLelcosse4lcsapreparedbyeixlugSpartsbyv>s~tofthisLubricatinggrademlybdanusLdisulfidawith2partebyweightofcosaerciaL~loNhdegbyvolssssaianetreceded,theLateatolchioLubricatissgaixtura~=ia.to-provide.~flssideyetmtocarcysolidLubricanttochecloselyfitte4porta+AproperssixturevillLeave~sooothuniforsccoecingonthesurface~4a.yaccLftha'ssixtura4oeanotcontaissenoughalcohol~theLubricantdeca-cueflosrwellsssdyrodueeaaLussyycoatissg~Tooseschalcoholyroducaa~tata,~aifosacoating.%hossnoclauaa,thossixtureshouldbekeyc-taa.eeale4-ceecaismtopravmtevaporative.ofthealooho4IfsuffioiesscalcohoLhaaevaporatedtosaketheLubricantwiseoueorpsetelike,anewbeechshouldbeprepared,~theeixosresectleerapidlysodshouldbesexedweilbeforeeachuee<<~eyylyiagthaIssbricaettotheeseeahledLtsgacriyattache,refetcothoeyyrssyriacafigaroiathoLaacruetiossbookThafoLLowingiteeaahoeL4balubcieate4s,r..':-t.Theriss.ruaaingchroughthetriparring~fthaLeech~~54+%@(+)~.'vA)..~'>'<<>(St<<<<<<4+~)><<'<<+)t',.,)..>>).+i<<'v>~..,<<irv>t<<.)<<+>1~<<.),'Tho'Lebcioe~caabe"ayy>iieC,eeiagaa,eyedroyyeri'ieaLI.rode'eoother;~"..mitabL'e.~'for4ieyeesingacingledrop,Onedropofialsricaetshould'~:~%boiayylda4'toeachpointwhere,theshe%0.perte>~Lsscsxstactwithanother;t-'oacaL'rect~De>nec,eeeaLuhricace)'t'1<<vr4g>)~1<<vI;~:.-~A~(sle'aheaty.ssixad-fross.giLLfasi,F~.Iyo,.Leer~v..."~'FadedSass.Sr922'~.Hew.Sadford~Sreaao02742.";i.":iEF~~V21;aa'Msriossst,S370LmNR.18188<<~><<)<<)s<'>),.jC<<.~I'>4V>t>~'t~~~*>'>.g*<<'tqvr+\'o~gr~)<<)r<<<<Mw++t+)~>&[tent<<<<>@~Pi<<~<<>>trany,'>+<<<<>><<~+Wg<<~:'.:=;~;c.".=.~s..'-""...:.,$y:-"'-"'.VQQl?408OQSK%LKCRlCCORPORNOH.:'"-.=,.1'&d'A'fh-',pJY'<<>1)At<<gr<<~r')~~~t;~V>,Wl<<N<<('-.PP."ii~:.i4~"<<Vr~1~c';-'~p4f;><<t)rl.Oe,1>PP<<<<<,

N-32.2AttachmentIXXPage3of3III.III\J04IIIr'COvmROOSTATlOCORfTRySPRtgOTR>tLEVENFig.17-VndeveltatleTnpAttachmen!-ConatrcrctionDetaila~\W4~

~V~I 14.~REACTORTRIPSYSTEMRELIABILITY(AUTOMATICACTUATIONOFSHUNTTRIPATTACHMENTFORWESTINGHOUSEANDBOWPLANTS)Thepowerdistributionsystemfortheroddrivemechanismsconsistsoftwomotor-generatorsetsoperatingfromtwoseparatenonsafeguards480voltbuses.ThegeneratorsareparalleledthroughWestinghousetypeDBaircircuitbreakersasshownonFigureI(Attachment6),andfeedtherodpowercabinetsthroughtwoseriesconnectedreactortripbreakers.TheseriesreactortripbreakersaredesignatedasR.T.A.andR.T.B.BypassbreakersBYAandBYBarearrangedsothattheycanbeconnectedinparallelwiththetripbreakerstofacilitateonlinetesting.Onlyonebypassbreakerisallowedinserviceatatimesoastominimizethelikelihoodoftworeactortripbreakersbeingbypassedatthesametime(seeFSARSection7.2-22.)FigureIshowstheexistingreactortripandpowerdistributionscheme.ThetwoseriesreactortripbreakersandthetwobypassbreakersareWestinghousetypeDB50sandareequippedwithtwotypesoftrippingfeatures.Theundervoltagetripattachment(UV)tripseachbreakerautomaticallywhen125VDCpowerisinterruptedtotheUVs.ThetrippinglogicisformedbyauxiliaryrelaysRTlthroughRT14andrequiresthattwocontactsopentocauseavalidtripcondition.Inaddition,eachreactortripbreakerwillopenonlossofdclogicpower.Eitherofthetworeactortripbreakersiscapableofcausinginterruptionofacpowertotherodmechanism,resultinginareactorshutdown.Thesecondbreakertrippingfeatureistheshunttripcoil(STA).,This'isacommontripcoil(TC)thatuponbeingenergized,by125VDCcontrolpower,willcausethebreakerstotrip.ThisSTAfeatureispresentlybeingusedtomanuallytripthePTand/orBYbreakersfromremotelocations.TheshunttripcoilsisnotshownonFigure1butisshownasTConFigure2~Boththetripandundervoltageattachmentsareelectro-mechanicaldevices.Whenenergizedordeenergizedtheywilloperatealinkageassemblywhichmechanicallyliftsupthetripperbar,causingthebreakertotrip.Themechanicalpartshavebeenmaintainedand,todatehavenotshownanysignsofbinding,oranyothermalfunctionthatwouldprecludeavalidtrip.However,toimprovetheoperabilityofthetripperbarassemblyandtominimizethelikelihoodofafailureofabreakertotrip,amodificationisproposed.Thismodificationisconsistentwith'therequirementsofGenericLetter83-28,andisshownonFigureII(Attachment6.)Thetwoexistingreactortripbreakerswillbemodifiedsoastouseareversetrippinglogictoautomaticallyactivatetheexistingtripcoilconcurrentwiththedeenergizationofthe

~>)~aCfiTkNJl'l undervoltagecoil.Thiswillresult,intwosimultaneousmechanicalforcesactingonthetrippe'r-barwherepresentlyonlyoneforceexists.Theauxiliaryrelaysthatformtheexistinglogichaveboth"a"and"b"typecontacts.The"b"contactsclosewhentheRTrelaysdeenergizewhil'ethe,"a"opens.The"b"contactswillbeusedtoformareverselogicwhichwillenergizethetripcoils.WhentheRTrelaysdropoutthe"a"logiccontactswillopen,deenergizingtheundervoltagecoilresultingintwosimultaneousforcesactingonthetripperbarassembly.The125Vdcpowerfortheundervoltagetripassembliesissuppliedfromthereactorprotectioncabinetsandisreferredtoaslogicpower.Theproposedshunttripcoilswillbepoweredbyseparate125VdcfusesineachreactortripbreakerandisreferredtoasControlPower.Theuseofseparatelyfusedsourcesaffordsadditionaldiversitytothetrippingscheme.ThisschemeasproposedisconsistentwiththeWestinghousegenericdesignpackageoftheautomaticshunttripmodifi-cationassubmittedtotheNRConJune14,1983,withexceptionthataninterfacingrelayisnotrequired.Theaddition,ofanewelectromechanicalrelayisnotrequiredsinceacomplete"b"reverselogiciseasilyformedusingtheexistingRTrelays.Anotherauxiliaryrelaywouldaddanadditionaltimedelaytotheresponsetimeassociatedwiththeshunttripfeature.InadditiontotheRTlogicrelaystrippingeachreactortripandbypassbreakers,arecentmodificationwasinstalledwhichautomaticallytripsthereactortripbreakersusingtheUVA.Thisoccursatpowerlevelsbeloweightpercentandwithprimarytemperaturesatorbelow350F.Thedesignintentwastoinsurethatthecontrolrodsareunlatchedbeforecoolingdown.Sincethisaddedtrippingfeatureisonlyusedwhentheplantisheatinguporcoolingdown,itsinclusionintothereverselogicisnotwarranted.Specif-icallytheselowRCStemperatureinterlockspresentlyusedtotripeachreactortripbreakerusingtheUVAwillnotbeduplicatedontheshunttripcoillogic.TestingequipmentoftheRTbreakerswillbeaccomplishedusingexistingequipment.Inaddition,bothdiversetrippingfeatureswillbeindependentlytested.Thismodificationwillbeinstalledduringtherefuelingoutageof1985.

I25VDCLOCIC.FEWER."A"BbTTERYRTIRTGRT5RT7RT9TIIRTI3P7-IP7-28BELOW6%poWER(mo.TRAINAfe)'PEN.BELOWOFF(nP.TaoIHA<@)RT4RT6RTBRTIORT2RTI4RTIRT5PT5RT7RT9RTIlR'TIGRTA@RA-IjcLIVTcm9A-2'A'RAINBYEIUV&REARERTRIPOgLOSSOFFEWERTo~E.SEcolLSRT2RT4PT6RT8RTIORTI2.RT-I4P7-2ac~-Il25VDCLOGICPoWER"B'ATTERYTC4&A-2WAIUV5TRANI48ovBLISQ52~+!A.MTRB2-IKVAGER52/RT85+RTAzsoV,&OH',~PToRoDDRlVEMECHA,NISA6,4SaVBLISIS~h/ill8S2-2.el:KVAMTRGEN52/BYBS2~/YA.FlGLlRE1."EXIS'TINGALITOMA'TICREACTORTRIP lC RT4R'T6RTSRTIORTI'2RTI4CONTROLPh/RI25VOCLOGIGPCNVFRLOGICRTIRTGRTSRT7RT9RTIIRTIBP7-IP7-2TC4HA-ITc4%A-2oPEhlQELOVl35OFRTAUVBYBUVLCXolCSS~KZRTRIPaONLOSSOFPoWE,RTO.THESECOILSRT3RTSRT9RTIfRTQ'T4W6RTGRTIRTI2"A",TRODINIZSVPCcoNTRol.~ERl25VDCLaGICPOWERRTGRTI4TATCIBR'EA'KER'TRIPSWHENSHUNTTRIP(Tc)IGKNERGIZEDRTIRTGRTR'T7RV9RilIRTI3RT2RT+RT6RTBRTIORTI'2TI4RTBUVBYAUV~l5R~KERTRIPS'oNLoSSOFPOWERTOTHESECOILSRTSRT7T9RTGRT'2RT4RTbRTBRRTI2RTI4"P,"Z+~I<TClaSVoccoN~oLPoKER-FISSURE2.PROPOSE,DREACTOR'TRIPSCHFME,BREAKERTRIPSWI-IENSHuNVTRIPOc)ISENERG)2ED 0)Cy 4~4REACTORTRIPSYSTEMRELIABILITY(IMPROVINGINMAINTENANCEANDTESTPROCEDURESFORBGWPLANTS)BecausethenuclearsteamsupplysystematGinnaStationwasprovidedbyWestinghouseandnotB&W,thisitemisnotapplicableasaquestionforGinna.

7~P'4 REACTORTRIPSYSTEMRELIABILITY(SYSTEMFUNCTIONALTESTING)Functionaltestingofthereactortripsystemhasbeenperformedonayearlybasisthroughoutthelifeoftheplant.Moreextensivefunctionaltestingofthereactortripsystem,includingresponsetimetesting,beganduringthel983refuelingoutage.Thetestconsistsofmeasuring.thetripresponsetimeofeachbreaker.Thebreakersaretrippedfromaremotelocationandthebreaker's"clearing"timeisrecorded.Thistestisrepeatedasecondtimewheneachbreakeristrippedbysimulatinganactual2outof3logicsignalwhichtripseachbreakerthroughtheRTrelays.Thistestingprogramwillbemodifiedtoindependentlytesteachofthetwodiversetrippingattachments.Aspartoftheacceptancetestingoftheinstalleddiversetrippingattachments,on-linefunctionaltestingofthereactortripsystemwillbeperformedbeforethereactorreaches100%power.Thebreakerresponsetimewillbedeterminedbydeenergizingtheundervoltagecoilwiththeshunttripcoilblocked.Thetestwillthenberepeatedwiththeundervoltagecoilblocked(energized)andthetripcoilactivated(energized).Thebreakerclearingtimeswillberecordedandtrendedforsignsofdegradation.Thereactortripbreakers,todate,haveexhibitedresponsetimesmuchfasterthanthemanufacturer'smaximumrecommendedvalue.Therefore,basedonthisdata,thefunctionaltestingwillcontinuetobeperformedonanannualorrefuelingbasis.However,shouldthebreakerresponsetimesincreaseandapproachthemaximumvalue,thenmorefrequent(online)functiontestingwillbeperformed.

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