ML17157A219

Rev 1 to SEA-EE-184, Evaluation of Unit 1 Annunciator Class 1E - Non-Class 1E Interfaces.

ML17157A219
Person / Time
Site:	Susquehanna
Issue date:	05/03/1990
From:	ARUS J P PENNSYLVANIA POWER & LIGHT CO.
To:
Shared Package
ML17157A218	List: ML17157A217 ML17157A219 ML17157A220 ML17157A221 ML17157A222 ML18030A072
References
SEA-EE-184, SEA-EE-184-R01, SEA-EE-184-R1, NUDOCS 9006290161
Download: ML17157A219 (21)

Text

~~~ENGINEERING STUOIES,ANALYSES, ANOEVALUATIONS COVERSHEET OUALITYLEVELSAFETYASHEO'THERHOHOUALITYER!CTHHO.SEAHO.SEA-EE-184 OCPHO.PAQE1OF11EVALUATION OFUNIT1ANNUNCIATOR CLASS1E-NON-CLASS 1EINTERFACES 90062901&i 900619PDRADOCK05000387PPDCoIIIg~//'.REVISIONNO.OATEPREPAREOBYREVIEWEOBYAPPROVEO5

~l~0 SEA-EE-184 Rev.1Page2of11EVALUATION OFUNIT1ANNUNCIATOR CLASSlE-NONCLASS1EINTERFACES TABLEOFCONTENTSPAGE1.02.03.04.05.06.0SCOPECONCLUSIONS ANDRECOMMENDATIONS INPUTSANDASSUMPTIONS METHODRESULTSREFERENCES APPENDIXA-ANNUNCIATOR INPUTDATA.APPENDIXB-ANNUNCIATOR POINTS-INTERFACE DEVICESUSEDFORCLASS1ECIRCUITS.

APPENDIXC-ANNUNCIATOR POINTS-INTERFACE DEVICESUSEDFORALARMANDINDICATION ONLY.APPENDIXD-ANNUNCIATOR POINTS-CUTLER-HAMMER ARMEDPUSHBUTTON.APPENDIXE-ANNUNCIATOR POINTS-AFFILIATED CIRCUITS.

Pg]y~gyHQ-6+)-IFc75y~pHV-8'kl-IFo79fN@k~wp2-gtgcc,A,uu.cjei7SWI~4-h'<gRrKGNorgxpND7c'oiPgTgycKF-<Dluypgg~<g/UoggyaplyeiLIa/H.-gREVly~ogD~5c-R<pT~~M J~f~01C 1.0SCOPESEA-EE-184 Rev.1Page3of11ThepurposeofthisSEAistodetermine thefailuremodesoftheClass1E-nonClass1Einterface devicesusedasUnit1annunciator inputsandevaluatetheaffectsofthesefailuresontheClasslEcircuitsconnected totheinterface devices.TheconcernisthatthefailureoftheClass1E-nonClass1Einterface devicescouldpreventtheClass1Ecircuitsfrommeetingtheirminimumperformance requirements.

2.0CONCLUSION

S ANDRECOMMENDATIONS

2.1CONCLUSION

S TheopencontactsofallClasslE-nonClass1EUnit1annunciator interface devicesareabletowithstand thespecified impressed voltageacrossthecontactwithoutcausinglossofoperability ofthedevices.Inotherwords,,theseinterface deviceswillnotfailinsuchamannerastopreventtheClasslEcircuitsfrommeetingtheirminimumperformance requirements if120VACor250VDCisspuriously impressed ontheopencontactsutilizedintheAnnunciator System.However,thespecified impressed voltagesacrossannunciator inputclosedcontactscouldweldcontactsclosedifsufficient currentflowedforasufficient duration.

AnalysisoftheClass1E-nonClasslEUnit1annunciator interface devices,exceptfortheHV-151-F007A andHV-151-F007B limitswitches, showsthatthesedeviceswillmeettheirminimumperformance requirements eveniftheannunciator inputcontactshouldperhaps,weldshut.Thisconclusion isbasedupontheevaluation oftheinstalled Class1E-nonClass1Edevicesthatshows:Theinterface deviceschangepositionandmeettheirminimumperformance requirements beforetheannunciator co'ntacts areexposedtopotential contactwelding.OR-Theinterface devicesareusedforalarmandindication onlyandcontactsfromthesedevicesarenotused.inClass1Ecircuits.

OR--Theinterface devicesmeettheirminimumperformance requirements evenwithannunciator inputcontactsweldedshut.

Il~1t ORSEA-EE-184 Rev.1Page4of11--Theinterface devicesareinaffiliated (associated) circuitsandcontactsfromthesedevicesarenotusedinClasslEcircuits.

2.2Intheeventannunciator inputlimitswitchesforHV-151-F007A andHV-151-F007B weldshut,thelimitswitchmaindriveshaftscouldperhapsbreaklooseinternaltothevalvescausingthevalvestojam,thuspotentially preventing fullclosureofthevalves.Morethanlikelytheweldedshutlimitswitcheswouldcausedamagetothelimitswitchgearing,butwouldnotpreventthesubjectvalvesfromclosing.RECOMMENDATION ToassurethattheHV-151-F007A andHV-151-F007B valveannunciator inputlimitswitchesdonotweldshut,qualified ClasslE-nonClass1Eisolation devicesaretobeinstalled intheannunciator inputlimitswitchcircuitsfromthesevalves.Thecircuitdesignshouldbes'uchthatthelimitswitchesactuatetheClasslE-nonClass1Eisolation deviceswithcontactsfromthesedevicesusedasannunciator inputs.Thispreventstheannunciator inputlimitswitchesfromweldingshutforthespecified impressed voltagesontheannunciator inputcables.ThisactionwillbetrackedbyNCR87-0021.Inordertoprecludetheneedforfutureengineering analysisandmaintaincompliance withRegulatory Guide1.75,gualified Electrical Isolators, capableofwithstanding 120VACand250VDC,shouldbeinstalled fornewly-engineered annunciator inputsdeveloped fromClass1Edevices.Alsogualified Electrical Isolators shouldbeinstalled forexistingannunciator inputswhenmodifications toexistingClass1E-nonClass1Eannunciator interface devicesareperformed.

Thisrecommendation isin-linewithNPE-Electrical Groupstrategyofeliminating potential pitfallsformaintaining compliance totheplantlicensing commitments.

Thisrecommendation willbeincludedintheDesignDescription Manual,Chapter29fortheComputer/ACR andE1012,"Specification ofElectrical Separation."

3.0 INPUTSANDASSUMPTIONS

3.1INPUTSAtSusquehanna SES,allannunciator inputcircuitsarenonClass1E.Alargenumberoftheseinputsaredeveloped fromClasslEdevices.

~II~l4

~I~ISEA-EE-184 Rev.1Page5of11Anexception toRegulatory Guide1.75,whichendorsesIEEE384-1974, andasdiscussed inFSARSection8.1.6.1q(7),allowstheconnection oflow-energy nonClass1EcircuitstoClass1Edevicesprovidedananalysishasbeenperformed todemonstrate thattheClass1Ecircuitsarenotdegradedbelowanacceptable levelforfaultsonthenonClass1Ecircuits.

Annunciator cablesareroutedinnonClass1Eracewayswhichalsocontain120VAC,125VDCand250VDCcables.Potential damagetocablesinnonClasslEracewaysmaycauseaccidental imposition

.of120voltsACor250voltsDConannunciator inputwire(s),andthroughthesewirestotheClass1Edevice(s).

BothopencontactsandclosedcontactsoftheClass1E-nonClass1Eannunciator interface devicesaretobeevaluated.

Thestudyislimitedtodigitalannunciator inputsintheUnit1AlarmResponseProcedures listedinTableA.3.2ASSUMPTIONS Thestudywasbasedonas-builtdrawingsandthedocuments-issuedasofthedateoftaskinitiation.

Affiliated circuitsinthisstudyweretreatedthesameasClasslEcircuits.

4.0 METHODAchangeinstateofaannunciator

inputcontactwhilethereisanimpressed voltagewasnotconsidered.

Onlythecontactintheopenorclosedpositionwasanalyzed.

Allannunciator inputslistedinthe"TableA,Unit1AlarmResponseProcedures" wereexaminedto,identify thesystemdrawingsanddocuments requiredfordetailreview.Allofthesedrawingsanddocuments werereviewedtodetermine whichannunciator inputsarederivedfromtheClasslEdevicesandwhicharederivedfromnonClass1Edevices.TheresultsofthisreviewarelistedintheAnnunciator InputDataTablesshowninAppendixA.Thetablesalsoincludetheinformation onrelatedrefere'nce

drawings, devicetagnumbersandlocations.

TheClass1Edevicesweresortedtodetermine identical devicessuchasrelays,limitswitches, contactors, etc.Eachdevicerating,type,manufacturer andmodelnumberwasidentified anddocumented intheAnnunciator InputDatatable.Thefunctionandoperation ofallClass1Edevices.was analyzedinordertoevaluatetheimpactofpossibledevicefailureonClasslEcircuits.

SEA-EE-184 Rev.1Page6ofll5.0Evaluation ofthefailuremodeswasperformed foreachClass1Edevice,basedonthepossibility ofaccidental imposition of120VACor250VDConannunciator inputwires.TheClass1E-nonClass1Einterface deviceswerereviewedtodetermine ifthecontactsfromthesedevicescouldperhapsweldshutduringimpressed voltagefaults.FortheClass1E-nonClass1Einterface devicesthatmayweldshut,evaluations wereperformed toassurethatthese'devicescanmeettheirminimumperformance requirements.

RESULTSReviewoftheUnit1AlarmResponseProcedure inTableArevealedthattherearethefollowing twenty-nine (29)specifictypesofClass1E-nonClasslEannunciator inputinterface devices:1.Westinghouse MOCAuxiliary Switch.2.Limitorque LimitSwitch.3.NAMCOLimitSwitch.4.GECR105MagneticContactor.

5.GEHFA51Relay.6.GEHMA11Relay.7.Cutler-Hammer Reversing Contactor.

8.Cutler-Hammer Type"M"Relay.9.AgastatEGPRelay.10.AgastatE7024TimingRelay.11.Westinghouse HighSpeedARRelay.12.Magnetrol Model751LevelSwitch.13.FCIModel8-'66LiquidLevelController.

14.Riley86T/CMonitor.15.Potter5Brumfield KH-4690Relay.16.Bailey745AlarmUnit.17.GETypeCR2940.18.AGATypeTR.19.Cutler-HammerType10250TP.B.20.Potter5Brumfield TypeMDR.21.GEType2820.22.Westronics Recorder.

23.Barkadale PressureSwitch.24.StaticInc.PressureSwitch.25.Barton-Pressure Switch.26.SquareDPressureSwitch.27.SquareDLevelSwitch.28.Balsbaugh-Conductivity TI29.Potter8Brumfield TypeKRPAllannunciator points,relatedreference

drawings, devicetagnumbersandlocations, deviceratings,type,manufacturer andmodelnumbersarelistedinAppendixA.

If~PUI'Ih'I'0l SEA-EE-184 Rev.1Page7ofllInthecaseofaccidental imposition of120VACor250VDConannunciator inputwiresduetopossiblecablefailure,opencontactsofalltheidentified Class1E-nonClass1Einterface devicescanwithstand theseimpressed voltages.

Impressed voltagesacrossclosedcontactsoftheseClass1E-nonClasslEinterface devicescouldcausecontactstoweldshutifsufficient currentflowedforasufficient duration.

However,theseClass1Edevices,exceptforHV-151-F007A andHV-15/-F007B limitswitches, willstillmeettheirminimumperformance requirements withtheannunciator inputcontactsweldedshut;EventheWestinghouse MOCauxiliary switchesandtheNamcolimitswitchesusedforannunciator inputcouldweldshutforthespecified impressed voltagessincethe814AWGcopperconductors usedtoconnecttheseswitchestotheannunciator maynotmeltopenbeforetheswitchesweldshut.Thisisduetothefactthatthecontinuous thermalcapability oftheseswitchesapproachthatofthe014AWGconductors.

Theannunciator pointsinAppendixBareinitiated byClass1E-nonClasslEinterface deviceswhichalsoinitiateClass1Ecircuits.

Duringnormalplantoperation, opencontactsfromthesedevicesprovidetheannunciator inputs.Fortheannunciator inputcontactstoclosetheClasslE-nonClasslEinterface deviceshavetochangethestateoftheircontacts.

Oncethecontactstatehaschanged,thesedeviceshavemettheirminimumperformance requirements.

Therefore, theClass1E-nonClasslEinterface devicesmeettheirminimumperformance requirements beforethecomputerinputcontactsareexposedtopotential welding.Theannunciator pointsinAppendixCareinitiated byClasslE-nonClasslEinterface deviceswhichareusedforalarmandindication only.ContactsfromthesedevicesarenotusedinClasslEcircuits.

Therefore, weldedannunciator inputcontactsdonoteffectClasslEcircuits.

Theannunciator pointsinAppendixDareinitiated byClasslECutler-Hammerarmedpush-button switchesusedtomanuallyinitiatesafetysystems.Whentheseswitchesarechangedtothearmedpositions, theannunciator contactsclose,however,thesafetysystemshavenotbeeninitiated.

Thepotential weldingshutoftheseannunciator inputcontactsdonotpreventtheseswitchesfrommeetingtheirminimumperformance requirements sincethecontactsinitiating thesafetysystemsareactuatedbyapushbuttonratherthantherotocammechanisms usedfortheannunciator contacts.

Thepush-button actionisindependent fromtherotocamaction.Theannunciator pointsinAppendixEareinitiated frominterface devicesinaffiliated circuits.

ThesedevicesarepoweredfromClasslEsources;however,contactsfromthesedevicesarenotusedinClass1Ecircuits.

Therefore, weldingcomputerinputcontactsdonoteffectClasslEcircuits.

l)p, SEA-EE-184 Rev.1Page8of11TheClasslELimitorque limitswitchesthatprovideannunciator inputsarepartofmotor-operated valveswhichareinoneofthefollowing groups:1.Requirenoautomatic operation.

2.Requireautomatic closure.3.Requireautomatic opening.4.Requireautomatic operation.

TheClass1Emotor-operated valvesinGroups1,2and3are:NoAutomatic 0erationAutomatic ClosureAutomatic

~0enHV-E11-1F004A HV-E11-1F004B HV-E11-1F004C HV-E11-1F004D HV-C41-1F006 HV-11215A HV-11215BHV-151-F006A HV-151-F0068 HV-151-F006C HV-151-F006D HV-149-F060 HV-E51-1F059 HV-E21-1F001B HV-149-F062 HV-15703HV-149-F084 HV-15705HV-E41-1F002 HV-15711HV-E41-1F003 HV-15713HV-E41-1F066 HV-E41-1F075 AHV-E41-1F079 Thesevalveshaveopenlimitswitchesforannunciator inputsduringnormalplantline-up.Theselimitswitchesarenotexposedtopotential welding.Intheeventthenormalplantline-upischanged,thevalveschangetotheirnewpositions beforethecomputerinputlimitswitchesareexposedtopotential welding.Therefore, weldingofthecomputerinputlimitswitchesdoesnotpreventthemotor-operated valvesfrommeetingtheirminimumperformance requirements.

TheGroup4valvesaretheRHRPumpMinimumFlowValvesHV-151-F007A andHV-151-F007B.

Thesevalvesarerequiredtoautomatically openand/orclose,however,theannunciator inputlimitswitchesfromthesevalvescouldbeclosedbeforetheirautomatic operations arerequired.

Intheeventtheannunciator inputlimitswitchesweldshut,thelimitswitchmaindriveshaftscouldperhapsbreaklooseinternaltothevalvescausingthevalvestojam,thuspotentially preventing fullclosureofthevalves.PerDanWarsingofLimitorque Corp.,thisisveryunlikely.

Morethanlikely,theweldedshutlimitswitchwillcausedamagetothelimitswitchgearing,butwillnotpreventthevalvesfromclosing.ToassurethattheHV-151-F007A andHV-151-F0075 valveannunciator inputlimitswitchesdonotweldshut,qualified Class1E-nonClass1Eisolation devicesaretobeinstalled intheannunciator inputlimitswitchcircuitsfromthesevalves.ThecircuitdesignshouldbesuchthatthelimitswitchesactuatetheClass1E-nonClasslEisolation deviceswithcontactsfromthesedevicesusedasannunciator inputs.Thispreventstheannunciator inputlimitswitchesfromweldingshutforthespecified impressed voltagesontheannunciator inputcables.ThisactionwillbetrackedbyNCR87-0021.

EI SEA-EE-184 Rev.1Page9of11Thesuppression poolvacuumreliefvalvesuseNamcolimitswitchesforannunciator inputs.Theseaffiliated valvesarepoweredfromClass1Esources.However,thesevalvesandtheirlimitswitchesarenotusedinClass1Ecircuits.

Therefore, weldinganannunciator limitswitchdoesnoteffectClass1Ecircuits.

'.0REFERENCES 6.1SEA-EE-183, Rev.0.6.2IEEE279-1971.

6.3IEEE384-1974.

6.4Regulatory Guide1.75,Rev.0.jpa/msk018i (18)

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