ML17255A520
| ML17255A520 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 10/05/1983 |
| From: | ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17255A515 | List: |
| References | |
| M-32.2, NUDOCS 8311150379 | |
| Download: ML17255A520 (27) | |
Text
ATTACHMENT 5ROCHESTER GASANDELECTRICCORPORATIO QtXN~SY<V~ONUNljgfCOMPLETED SATE:-TtME:-GINNASTATIONCONTROLLED COPYNDMBERPROCEDURE NO.M-32.2REV.NO.3DB-58REACTORTRIPCIRCUITBREAKERIVASPECTIONVE MAINTENANCE ANDTESTTECHNICAL REVIKfPORCREVIENDATEOC27EB'EVIEWPLANSPINTENDENTOCT5j983EFFECTIVE DATEQA4iVON-QACATEGORY1.0REVIEWEDBY:THISPROEDURECONTAINS6PAGES+ATTACHMENTS 83iii50379 83ii04PDRADOCK,05000244, P'"DR 4
M-32':1M-322DB-58REACTORTRIPCIRCUITBREAKERINSPECTION, MAINTENANCE ANDTESTPURPOSE:Toperforminspebl.on,maintenance andtestofDB-58ReactorTripandReactorTripBypassBreakers.
2.8REFERENCES
2.12'Nestinghouse switchgear divisioninstruction bookZB-33-953-3C instructions forDB-59,DBF-loandDBL-58aircircuitbreakers.
fwestinghouse Technical BulletinVSD-TB-B3-82, datedMarch24,1983.3'INITIALCONDITIONS:
"lotifyQCpriortostarting.
Anyphaseofplantoperations.
ThShiftSupervisor andHeadControlOperatorshallbenotifiedjustpriortoanyinspection orma'tenanc ont¹reactortripsystem.ShiftSupervisor HeadControlOperator4.RPRECAUTIONS:
4.14~2Obtainpaxtsorsuppliespex%-831.Lubrication ofbreakermechanical bearingpointsistobeappliedsparingly, ifnecessary, usingND-49usingcautiontoassuxethatdustandcontamination inotherformareremovedpriortoax3plying.
M-32':25.8INSTRUCTIONS-5.1Indicatehereandonfrontcoverofprocedure thebreakertobeworkedon.N/Aotherspacesnotrequired.
Bypass5~2Removefromservice.5~2~1Atpower(markN/Aifnotatpower).5.2~1~1Establish communications betweenControlRoom,RelayRoom,andReactorTripBreaker.5~2~1~2Electricians placereactortripbypassbreakerintopositiontobypassbreakerundergoingmaintenance, andrackintothe"FullyRackedIn"position.
Verifythat28ASTand28ETindicating lightsareilluminated atbreakerpanel.5.2.1.3"Close"By-passBreakerbyactuation ofresetpushbutton eaVerifythat28ASTand28ETindicating lightsareNOTilluminated.
5.2.1.4"Trip"By-passBreakerbyactuation ofpushbutton tripswitchinreactorlogictestcabinetoythe~oositetrain.Verifythat28ASTand28ETindicating lightsareilluminated.
5.2.1.5"Close"By-passBreakerbyactuation ofresetpushbutton switch,andverifythat28ASTand28ETindicating lightsarenotilluminated.
5.2.1e6"Trip"ReactorTripBreakertobeworkedonbyactuation ofpushbutton tripswitchswitchinthereactorlogictestcabinetforthattrain.5~2.2Holdbreakerinaccordance withA-1481StationHoldingRules,ifapplicable.
5.3Performinspection ofbreakerasfollowsandnoteresultsonthedatasheet:
Z~00 5gal~~Checkforpresenceofdust,dirtandothertypeofforeignsubstances orcontaminants.
5Checkforloose,damaged,brokenordistorted parts.5.3.3Checkforwearorsignsofrubbing.5'.4Verifyclearance betweenthetriptabandtripperbaronbreakerpositioning attachment onlefthandsideofbreaker.NOTE=Clearance shouldbel/8"minto3/16"maxium.consistofwipingwithpapertowelorlintfreeclothsto'removedustanddirt.Insomecases,brushingwithamediumbristleorstiffbristlebrushmaybenecessary..-
DoNotuseawirebrush,orhighpressureair.5.4.1~~Vacuuming maybeutilizedasasubstitute forbrushing.
5.4.2Ifstickyorgummysubstances arepresentamildsolventmaybeused.Applysolventtopapertowelsorlintfreeragsandwipe.DoNotapplysolvent,to coils,wiresorotherelectrical parts.Avoiduseofspraysolvent.5.4.3Ifcl'eaning wasperformed, reinspect breakerperstep5.2.5'Performtroubleshootingandmaintenance asrequiredandnoteworkdoneondatasheet.5~5~lIflubrication ofUVAttachment isconsidered ncessary,lubricate usingpropermaterials pointsrequiring lubrication perAttachment IandII.(flAotherwise)
Maintenance RelatedTestin5~6~1PerformmanualtestoftheUUAttachment, byde-energizing UVAttachment butholdingitintheresetpositionbyatemporary restraint ontheresetlever,thebreakerisclosed(eithermanuallyorelectrically.
)Then,thetemporary restraint is~slowlreleased.
allowingtheUUAttachment toperformthebreakertripfunctionbeforetheresetlevercomestorest.5.6.1.1Monitorforunhesitant, smooth,positive, snap-action oftheUVAttachment andbreakertrip,andnoteondatasheet.5.6.1.2Removetemporary restraint aftersuccessful completion ofthistest.5.6~2Afterinspection andmaintenance, performafinaloperational check,oftheUVAttachment andbreakertripactionbyclosingthebreakreithermanuallyorelectrically, thentrippedbyde-energizing oftheUVAttachment.
Rpeatthis18timesanddocumentonattacheddatasheet.NOTE=Thisappliestopostmaintenance testingandisnotassociated withPTorESHPtestprocedures.
5.6.2.1Thebreakershallbeclosedelectrically andelectrical breakertripviashunttripdeviceverifiedatleastonce.'ocumentonattacheddatasheet.5.7NotifyResultsandTestsupervision ofmaintenance erformedandtheneedtotestthereactortribreakerusingappropriate testprocedures.
5.7.1ResultsandTestsupervision hasdetermined theapplicable testprocedure tobeutilized:
(ifnecessary)
Applicable stepsofprocedure no.RETSupervision tI40 COMPLETED BY:DATECOMPLETED:
ELECTRICIANFOREi~IAN:
RESULTS6TESTSUPERVISION:QCSUPERVISION:
POSTPORCREVIEWDATE:
aM-32':6Device:Inspby:Date:MFA:Type+S/m-TypeofInsp:.Annual:Special:*BreakerInspection (MarkCondition)
'lignmentl ContactsAssemblyI'ondition[
AhaseBhaseCahaseAssemblyIA.RCIChutesCondition IPrimarycontactCompression ArcingContactCompression MakeandBreak(Max.Diff.)Otherwise 8/AifnotRequiredl FoundLeft123Acceptable:
General:Mainand-Secondary Disconnecting Device:Insulators:
Cubicle:Allnuts,bolts,cotterpinsandetc.tightandinplace:Connections:
Panel:Aux.SN':ClosingRelay:Clearance oftriptabtotripperbarapprox.clearance 1/8"to3/16".UnderVoltaeTripAttachment FoundLftClearance
-Triplever totripbar.approx.l/16"Clarancewhenthebreakerishalfwayclosed.Testing:ManualtestofUVAttachment UVoperation verified18timeShunttripoperation verifiedComments:
Westinghouse Nuclear~ServiceDivisionTechnical BulletinM-32.2Attachment IPagelof3advisorynoticeofarecenttechnical development pertaining totheinstallation oroperation ofWestlnghou~pplied Nucleir~Plantequipment.
Recipients shouldevaluatetheinformation andrecommendation, andinitiateactionwhereappropriate.
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~V~I 14.~REACTORTRIPSYSTEMRELIABILITY (AUTOMATIC ACTUATION OFSHUNTTRIPATTACHMENT FORWESTINGHOUSE ANDBOWPLANTS)Thepowerdistribution systemfortheroddrivemechanisms consistsoftwomotor-generator setsoperating fromtwoseparatenonsafeguards 480voltbuses.Thegenerators areparalleled throughWestinghouse typeDBaircircuitbreakersasshownonFigureI(Attachment 6),andfeedtherodpowercabinetsthroughtwoseriesconnected reactortripbreakers.
Theseriesreactortripbreakersaredesignated asR.T.A.andR.T.B.BypassbreakersBYAandBYBarearrangedsothattheycanbeconnected inparallelwiththetripbreakerstofacilitate onlinetesting.Onlyonebypassbreakerisallowedinserviceatatimesoastominimizethelikelihood oftworeactortripbreakersbeingbypassedatthesametime(seeFSARSection7.2-22.)FigureIshowstheexistingreactortripandpowerdistribution scheme.ThetwoseriesreactortripbreakersandthetwobypassbreakersareWestinghouse typeDB50sandareequippedwithtwotypesoftrippingfeatures.
Theundervoltage tripattachment (UV)tripseachbreakerautomatically when125VDCpowerisinterrupted totheUVs.Thetrippinglogicisformedbyauxiliary relaysRTlthroughRT14andrequiresthattwocontactsopentocauseavalidtripcondition.
Inaddition, eachreactortripbreakerwillopenonlossofdclogicpower.Eitherofthetworeactortripbreakersiscapableofcausinginterruption ofacpowertotherodmechanism, resulting inareactorshutdown.
Thesecondbreakertrippingfeatureistheshunttripcoil(STA).,This'isacommontripcoil(TC)thatuponbeingenergized, by125VDCcontrolpower,willcausethebreakerstotrip.ThisSTAfeatureispresently beingusedtomanuallytripthePTand/orBYbreakersfromremotelocations.
TheshunttripcoilsisnotshownonFigure1butisshownasTConFigure2~Boththetripandundervoltage attachments areelectro-mechanical devices.Whenenergized ordeenergized theywilloperatealinkageassemblywhichmechanically liftsupthetripperbar,causingthebreakertotrip.Themechanical partshavebeenmaintained and,todatehavenotshownanysignsofbinding,oranyothermalfunction thatwouldprecludeavalidtrip.However,toimprovetheoperability ofthetripperbarassemblyandtominimizethelikelihood ofafailureofabreakertotrip,amodification isproposed.
Thismodification isconsistent with'therequirements ofGenericLetter83-28,andisshownonFigureII(Attachment 6.)Thetwoexistingreactortripbreakerswillbemodifiedsoastouseareversetrippinglogictoautomatically activatetheexistingtripcoilconcurrent withthedeenergization ofthe
~>)~aCfiTkNJl'l undervoltage coil.Thiswillresult,intwosimultaneous mechanical forcesactingonthetrippe'r-barwherepresently onlyoneforceexists.Theauxiliary relaysthatformtheexistinglogichaveboth"a"and"b"typecontacts.
The"b"contactsclosewhentheRTrelaysdeenergize whil'ethe,"a"opens.The"b"contactswillbeusedtoformareverselogicwhichwillenergizethetripcoils.WhentheRTrelaysdropoutthe"a"logiccontactswillopen,deenergizing theundervoltage coilresulting intwosimultaneous forcesactingonthetripperbarassembly.
The125Vdcpowerfortheundervoltage tripassemblies issuppliedfromthereactorprotection cabinetsandisreferredtoaslogicpower.Theproposedshunttripcoilswillbepoweredbyseparate125VdcfusesineachreactortripbreakerandisreferredtoasControlPower.Theuseofseparately fusedsourcesaffordsadditional diversity tothetrippingscheme.Thisschemeasproposedisconsistent withtheWestinghouse genericdesignpackageoftheautomatic shunttripmodifi-cationassubmitted totheNRConJune14,1983,withexception thataninterfacing relayisnotrequired.
Theaddition, ofanewelectromechanical relayisnotrequiredsinceacomplete"b"reverselogiciseasilyformedusingtheexistingRTrelays.Anotherauxiliary relaywouldaddanadditional timedelaytotheresponsetimeassociated withtheshunttripfeature.InadditiontotheRTlogicrelaystrippingeachreactortripandbypassbreakers, arecentmodification wasinstalled whichautomatically tripsthereactortripbreakersusingtheUVA.Thisoccursatpowerlevelsbeloweightpercentandwithprimarytemperatures atorbelow350F.Thedesignintentwastoinsurethatthecontrolrodsareunlatched beforecoolingdown.Sincethisaddedtrippingfeatureisonlyusedwhentheplantisheatinguporcoolingdown,itsinclusion intothereverselogicisnotwarranted.
Specif-icallytheselowRCStemperature interlocks presently usedtotripeachreactortripbreakerusingtheUVAwillnotbeduplicated ontheshunttripcoillogic.Testingequipment oftheRTbreakerswillbeaccomplished usingexistingequipment.
Inaddition, bothdiversetrippingfeatureswillbeindependently tested.Thismodification willbeinstalled duringtherefueling outageof1985.
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'ATTERY TC4&A-2WAIUV5TRANI48ovBLISQ52~+!A.MTRB2-IKVAGER52/RT85+RTAzsoV,&OH',~PToRoDDRlVEMECHA,NISA6,4SaVBLISIS~h/ill8S2-2.el:KVAMTRGEN52/BYBS2~/YA.FlGLlRE1."EXIS'TINGALITOMA'TIC REACTORTRIP lC RT4R'T6RTSRTIORTI'2RTI4CONTROLPh/RI25VOCLOGIGPCNVFRLOGICRTIRTGRTSRT7RT9RTIIRTIBP7-IP7-2TC4HA-ITc4%A-2oPEhlQELOVl35OFRTAUVBYBUVLCXolCSS~KZRTRIPaONLOSSOFPoWE,RTO.THESECOILSRT3RTSRT9RTIfRTQ'T4W6RTGRTIRTI2"A",TRODINIZSVPCcoNTRol.~ERl25VDCLaGICPOWERRTGRTI4TATCIBR'EA'KER
'TRIPSWHENSHUNTTRIP(Tc)IGKNERGIZED RTIRTGRTR'T7RV9RilIRTI3RT2RT+RT6RTBRTIORTI'2TI4RTBUVBYAUV~l5R~KERTRIPS'oNLoSSOFPOWERTOTHESECOILSRTSRT7T9RTGRT'2RT4RTbRTBRRTI2RTI4"P,"Z+~I<TClaSVoccoN~oLPoKER-FISSURE2.PROPOSE,D REACTOR'TRIPSCHFME,BREAKERTRIPSWI-IENSHuNVTRIPOc)ISENERG)2ED 0)Cy 4~4REACTORTRIPSYSTEMRELIABILITY (IMPROVING INMAINTENANCE ANDTESTPROCEDURES FORBGWPLANTS)BecausethenuclearsteamsupplysystematGinnaStationwasprovidedbyWestinghouse andnotB&W,thisitemisnotapplicable asaquestionforGinna.
7~P'4 REACTORTRIPSYSTEMRELIABILITY (SYSTEMFUNCTIONAL TESTING)Functional testingofthereactortripsystemhasbeenperformed onayearlybasisthroughout thelifeoftheplant.Moreextensive functional testingofthereactortripsystem,including responsetimetesting,beganduringthel983refueling outage.Thetestconsistsofmeasuring.
thetripresponsetimeofeachbreaker.Thebreakersaretrippedfromaremotelocationandthebreaker's "clearing" timeisrecorded.
Thistestisrepeatedasecondtimewheneachbreakeristrippedbysimulating anactual2outof3logicsignalwhichtripseachbreakerthroughtheRTrelays.Thistestingprogramwillbemodifiedtoindependently testeachofthetwodiversetrippingattachments.
Aspartoftheacceptance testingoftheinstalled diversetrippingattachments, on-linefunctional testingofthereactortripsystemwillbeperformed beforethereactorreaches100%power.Thebreakerresponsetimewillbedetermined bydeenergizing theundervoltage coilwiththeshunttripcoilblocked.Thetestwillthenberepeatedwiththeundervoltage coilblocked(energized) andthetripcoilactivated (energized).
Thebreakerclearingtimeswillberecordedandtrendedforsignsofdegradation.
Thereactortripbreakers, todate,haveexhibited responsetimesmuchfasterthanthemanufacturer's maximumrecommended value.Therefore, basedonthisdata,thefunctional testingwillcontinuetobeperformed onanannualorrefueling basis.However,shouldthebreakerresponsetimesincreaseandapproachthemaximumvalue,thenmorefrequent(online)functiontestingwillbeperformed.
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