ML17157A219
| ML17157A219 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 05/03/1990 |
| From: | ARUS J P PENNSYLVANIA POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML17157A218 | List: |
| References | |
| SEA-EE-184, SEA-EE-184-R01, SEA-EE-184-R1, NUDOCS 9006290161 | |
| Download: ML17157A219 (21) | |
Text
~~~ENGINEERINGSTUOIES,ANALYSES,ANOEVALUATIONSCOVERSHEETOUALITYLEVELSAFETYASHEO'THERHOHOUALITYER!CTHHO.SEAHO.SEA-EE-184OCPHO.PAQE1OF11EVALUATIONOFUNIT1ANNUNCIATORCLASS1E-NON-CLASS1EINTERFACES90062901&i900619PDRADOCK05000387PPDCoIIIg~//'.REVISIONNO.OATEPREPAREOBYREVIEWEOBYAPPROVEO5
~l~0 SEA-EE-184Rev.1Page2of11EVALUATIONOFUNIT1ANNUNCIATORCLASSlE-NONCLASS1EINTERFACESTABLEOFCONTENTSPAGE1.02.03.04.05.06.0SCOPECONCLUSIONSANDRECOMMENDATIONSINPUTSANDASSUMPTIONSMETHODRESULTSREFERENCESAPPENDIXA-ANNUNCIATORINPUTDATA.APPENDIXB-ANNUNCIATORPOINTS-INTERFACEDEVICESUSEDFORCLASS1ECIRCUITS.APPENDIXC-ANNUNCIATORPOINTS-INTERFACEDEVICESUSEDFORALARMANDINDICATIONONLY.APPENDIXD-ANNUNCIATORPOINTS-CUTLER-HAMMERARMEDPUSHBUTTON.APPENDIXE-ANNUNCIATORPOINTS-AFFILIATEDCIRCUITS.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-184Rev.1Page3of11ThepurposeofthisSEAistodeterminethefailuremodesoftheClass1E-nonClass1EinterfacedevicesusedasUnit1annunciatorinputsandevaluatetheaffectsofthesefailuresontheClasslEcircuitsconnectedtotheinterfacedevices.TheconcernisthatthefailureoftheClass1E-nonClass1EinterfacedevicescouldpreventtheClass1Ecircuitsfrommeetingtheirminimumperformancerequirements.
2.0CONCLUSION
SANDRECOMMENDATIONS
2.1CONCLUSION
STheopencontactsofallClasslE-nonClass1EUnit1annunciatorinterfacedevicesareabletowithstandthespecifiedimpressedvoltageacrossthecontactwithoutcausinglossofoperabilityofthedevices.Inotherwords,,theseinterfacedeviceswillnotfailinsuchamannerastopreventtheClasslEcircuitsfrommeetingtheirminimumperformancerequirementsif120VACor250VDCisspuriouslyimpressedontheopencontactsutilizedintheAnnunciatorSystem.However,thespecifiedimpressedvoltagesacrossannunciatorinputclosedcontactscouldweldcontactsclosedifsufficientcurrentflowedforasufficientduration.AnalysisoftheClass1E-nonClasslEUnit1annunciatorinterfacedevices,exceptfortheHV-151-F007AandHV-151-F007Blimitswitches,showsthatthesedeviceswillmeettheirminimumperformancerequirementseveniftheannunciatorinputcontactshouldperhaps,weldshut.ThisconclusionisbasedupontheevaluationoftheinstalledClass1E-nonClass1Edevicesthatshows:Theinterfacedeviceschangepositionandmeettheirminimumperformancerequirementsbeforetheannunciatorco'ntactsareexposedtopotentialcontactwelding.OR-Theinterfacedevicesareusedforalarmandindicationonlyandcontactsfromthesedevicesarenotused.inClass1Ecircuits.OR--Theinterfacedevicesmeettheirminimumperformancerequirementsevenwithannunciatorinputcontactsweldedshut.
Il~1t ORSEA-EE-184Rev.1Page4of11--Theinterfacedevicesareinaffiliated(associated)circuitsandcontactsfromthesedevicesarenotusedinClasslEcircuits.2.2IntheeventannunciatorinputlimitswitchesforHV-151-F007AandHV-151-F007Bweldshut,thelimitswitchmaindriveshaftscouldperhapsbreaklooseinternaltothevalvescausingthevalvestojam,thuspotentiallypreventingfullclosureofthevalves.Morethanlikelytheweldedshutlimitswitcheswouldcausedamagetothelimitswitchgearing,butwouldnotpreventthesubjectvalvesfromclosing.RECOMMENDATIONToassurethattheHV-151-F007AandHV-151-F007Bvalveannunciatorinputlimitswitchesdonotweldshut,qualifiedClasslE-nonClass1Eisolationdevicesaretobeinstalledintheannunciatorinputlimitswitchcircuitsfromthesevalves.Thecircuitdesignshouldbes'uchthatthelimitswitchesactuatetheClasslE-nonClass1Eisolationdeviceswithcontactsfromthesedevicesusedasannunciatorinputs.Thispreventstheannunciatorinputlimitswitchesfromweldingshutforthespecifiedimpressedvoltagesontheannunciatorinputcables.ThisactionwillbetrackedbyNCR87-0021.InordertoprecludetheneedforfutureengineeringanalysisandmaintaincompliancewithRegulatoryGuide1.75,gualifiedElectricalIsolators,capableofwithstanding120VACand250VDC,shouldbeinstalledfornewly-engineeredannunciatorinputsdevelopedfromClass1Edevices.AlsogualifiedElectricalIsolatorsshouldbeinstalledforexistingannunciatorinputswhenmodificationstoexistingClass1E-nonClass1Eannunciatorinterfacedevicesareperformed.Thisrecommendationisin-linewithNPE-ElectricalGroupstrategyofeliminatingpotentialpitfallsformaintainingcompliancetotheplantlicensingcommitments.ThisrecommendationwillbeincludedintheDesignDescriptionManual,Chapter29fortheComputer/ACRandE1012,"SpecificationofElectricalSeparation."3.0INPUTSANDASSUMPTIONS3.1INPUTSAtSusquehannaSES,allannunciatorinputcircuitsarenonClass1E.AlargenumberoftheseinputsaredevelopedfromClasslEdevices.
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~I~ISEA-EE-184Rev.1Page5of11AnexceptiontoRegulatoryGuide1.75,whichendorsesIEEE384-1974,andasdiscussedinFSARSection8.1.6.1q(7),allowstheconnectionoflow-energynonClass1EcircuitstoClass1EdevicesprovidedananalysishasbeenperformedtodemonstratethattheClass1EcircuitsarenotdegradedbelowanacceptablelevelforfaultsonthenonClass1Ecircuits.AnnunciatorcablesareroutedinnonClass1Eracewayswhichalsocontain120VAC,125VDCand250VDCcables.PotentialdamagetocablesinnonClasslEracewaysmaycauseaccidentalimposition.of120voltsACor250voltsDConannunciatorinputwire(s),andthroughthesewirestotheClass1Edevice(s).BothopencontactsandclosedcontactsoftheClass1E-nonClass1Eannunciatorinterfacedevicesaretobeevaluated.ThestudyislimitedtodigitalannunciatorinputsintheUnit1AlarmResponseProcedureslistedinTableA.3.2ASSUMPTIONSThestudywasbasedonas-builtdrawingsandthedocuments-issuedasofthedateoftaskinitiation.AffiliatedcircuitsinthisstudyweretreatedthesameasClasslEcircuits.4.0METHODAchangeinstateofaannunciatorinputcontactwhilethereisanimpressedvoltagewasnotconsidered.Onlythecontactintheopenorclosedpositionwasanalyzed.Allannunciatorinputslistedinthe"TableA,Unit1AlarmResponseProcedures"wereexaminedto,identifythesystemdrawingsanddocumentsrequiredfordetailreview.AllofthesedrawingsanddocumentswerereviewedtodeterminewhichannunciatorinputsarederivedfromtheClasslEdevicesandwhicharederivedfromnonClass1Edevices.TheresultsofthisreviewarelistedintheAnnunciatorInputDataTablesshowninAppendixA.Thetablesalsoincludetheinformationonrelatedrefere'ncedrawings,devicetagnumbersandlocations.TheClass1Edevicesweresortedtodetermineidenticaldevicessuchasrelays,limitswitches,contactors,etc.Eachdevicerating,type,manufacturerandmodelnumberwasidentifiedanddocumentedintheAnnunciatorInputDatatable.ThefunctionandoperationofallClass1Edevices.wasanalyzedinordertoevaluatetheimpactofpossibledevicefailureonClasslEcircuits.
SEA-EE-184Rev.1Page6ofll5.0EvaluationofthefailuremodeswasperformedforeachClass1Edevice,basedonthepossibilityofaccidentalimpositionof120VACor250VDConannunciatorinputwires.TheClass1E-nonClass1Einterfacedeviceswerereviewedtodetermineifthecontactsfromthesedevicescouldperhapsweldshutduringimpressedvoltagefaults.FortheClass1E-nonClass1Einterfacedevicesthatmayweldshut,evaluationswereperformedtoassurethatthese'devicescanmeettheirminimumperformancerequirements.RESULTSReviewoftheUnit1AlarmResponseProcedureinTableArevealedthattherearethefollowingtwenty-nine(29)specifictypesofClass1E-nonClasslEannunciatorinputinterfacedevices:1.WestinghouseMOCAuxiliarySwitch.2.LimitorqueLimitSwitch.3.NAMCOLimitSwitch.4.GECR105MagneticContactor.5.GEHFA51Relay.6.GEHMA11Relay.7.Cutler-HammerReversingContactor.8.Cutler-HammerType"M"Relay.9.AgastatEGPRelay.10.AgastatE7024TimingRelay.11.WestinghouseHighSpeedARRelay.12.MagnetrolModel751LevelSwitch.13.FCIModel8-'66LiquidLevelController.14.Riley86T/CMonitor.15.Potter5BrumfieldKH-4690Relay.16.Bailey745AlarmUnit.17.GETypeCR2940.18.AGATypeTR.19.Cutler-HammerType10250TP.B.20.Potter5BrumfieldTypeMDR.21.GEType2820.22.WestronicsRecorder.23.BarkadalePressureSwitch.24.StaticInc.PressureSwitch.25.Barton-PressureSwitch.26.SquareDPressureSwitch.27.SquareDLevelSwitch.28.Balsbaugh-ConductivityTI29.Potter8BrumfieldTypeKRPAllannunciatorpoints,relatedreferencedrawings,devicetagnumbersandlocations,deviceratings,type,manufacturerandmodelnumbersarelistedinAppendixA.
If~PUI'Ih'I'0l SEA-EE-184Rev.1Page7ofllInthecaseofaccidentalimpositionof120VACor250VDConannunciatorinputwiresduetopossiblecablefailure,opencontactsofalltheidentifiedClass1E-nonClass1Einterfacedevicescanwithstandtheseimpressedvoltages.ImpressedvoltagesacrossclosedcontactsoftheseClass1E-nonClasslEinterfacedevicescouldcausecontactstoweldshutifsufficientcurrentflowedforasufficientduration.However,theseClass1Edevices,exceptforHV-151-F007AandHV-15/-F007Blimitswitches,willstillmeettheirminimumperformancerequirementswiththeannunciatorinputcontactsweldedshut;EventheWestinghouseMOCauxiliaryswitchesandtheNamcolimitswitchesusedforannunciatorinputcouldweldshutforthespecifiedimpressedvoltagessincethe814AWGcopperconductorsusedtoconnecttheseswitchestotheannunciatormaynotmeltopenbeforetheswitchesweldshut.Thisisduetothefactthatthecontinuousthermalcapabilityoftheseswitchesapproachthatofthe014AWGconductors.TheannunciatorpointsinAppendixBareinitiatedbyClass1E-nonClasslEinterfacedeviceswhichalsoinitiateClass1Ecircuits.Duringnormalplantoperation,opencontactsfromthesedevicesprovidetheannunciatorinputs.FortheannunciatorinputcontactstoclosetheClasslE-nonClasslEinterfacedeviceshavetochangethestateoftheircontacts.Oncethecontactstatehaschanged,thesedeviceshavemettheirminimumperformancerequirements.Therefore,theClass1E-nonClasslEinterfacedevicesmeettheirminimumperformancerequirementsbeforethecomputerinputcontactsareexposedtopotentialwelding.TheannunciatorpointsinAppendixCareinitiatedbyClasslE-nonClasslEinterfacedeviceswhichareusedforalarmandindicationonly.ContactsfromthesedevicesarenotusedinClasslEcircuits.Therefore,weldedannunciatorinputcontactsdonoteffectClasslEcircuits.TheannunciatorpointsinAppendixDareinitiatedbyClasslECutler-Hammerarmedpush-buttonswitchesusedtomanuallyinitiatesafetysystems.Whentheseswitchesarechangedtothearmedpositions,theannunciatorcontactsclose,however,thesafetysystemshavenotbeeninitiated.Thepotentialweldingshutoftheseannunciatorinputcontactsdonotpreventtheseswitchesfrommeetingtheirminimumperformancerequirementssincethecontactsinitiatingthesafetysystemsareactuatedbyapushbuttonratherthantherotocammechanismsusedfortheannunciatorcontacts.Thepush-buttonactionisindependentfromtherotocamaction.TheannunciatorpointsinAppendixEareinitiatedfrominterfacedevicesinaffiliatedcircuits.ThesedevicesarepoweredfromClasslEsources;however,contactsfromthesedevicesarenotusedinClass1Ecircuits.Therefore,weldingcomputerinputcontactsdonoteffectClasslEcircuits.
l)p, SEA-EE-184Rev.1Page8of11TheClasslELimitorquelimitswitchesthatprovideannunciatorinputsarepartofmotor-operatedvalveswhichareinoneofthefollowinggroups:1.Requirenoautomaticoperation.2.Requireautomaticclosure.3.Requireautomaticopening.4.Requireautomaticoperation.TheClass1Emotor-operatedvalvesinGroups1,2and3are:NoAutomatic0erationAutomaticClosureAutomatic~0enHV-E11-1F004AHV-E11-1F004BHV-E11-1F004CHV-E11-1F004DHV-C41-1F006HV-11215AHV-11215BHV-151-F006AHV-151-F0068HV-151-F006CHV-151-F006DHV-149-F060HV-E51-1F059HV-E21-1F001BHV-149-F062HV-15703HV-149-F084HV-15705HV-E41-1F002HV-15711HV-E41-1F003HV-15713HV-E41-1F066HV-E41-1F075AHV-E41-1F079Thesevalveshaveopenlimitswitchesforannunciatorinputsduringnormalplantline-up.Theselimitswitchesarenotexposedtopotentialwelding.Intheeventthenormalplantline-upischanged,thevalveschangetotheirnewpositionsbeforethecomputerinputlimitswitchesareexposedtopotentialwelding.Therefore,weldingofthecomputerinputlimitswitchesdoesnotpreventthemotor-operatedvalvesfrommeetingtheirminimumperformancerequirements.TheGroup4valvesaretheRHRPumpMinimumFlowValvesHV-151-F007AandHV-151-F007B.Thesevalvesarerequiredtoautomaticallyopenand/orclose,however,theannunciatorinputlimitswitchesfromthesevalvescouldbeclosedbeforetheirautomaticoperationsarerequired.Intheeventtheannunciatorinputlimitswitchesweldshut,thelimitswitchmaindriveshaftscouldperhapsbreaklooseinternaltothevalvescausingthevalvestojam,thuspotentiallypreventingfullclosureofthevalves.PerDanWarsingofLimitorqueCorp.,thisisveryunlikely.Morethanlikely,theweldedshutlimitswitchwillcausedamagetothelimitswitchgearing,butwillnotpreventthevalvesfromclosing.ToassurethattheHV-151-F007AandHV-151-F0075valveannunciatorinputlimitswitchesdonotweldshut,qualifiedClass1E-nonClass1Eisolationdevicesaretobeinstalledintheannunciatorinputlimitswitchcircuitsfromthesevalves.ThecircuitdesignshouldbesuchthatthelimitswitchesactuatetheClass1E-nonClasslEisolationdeviceswithcontactsfromthesedevicesusedasannunciatorinputs.Thispreventstheannunciatorinputlimitswitchesfromweldingshutforthespecifiedimpressedvoltagesontheannunciatorinputcables.ThisactionwillbetrackedbyNCR87-0021.
EI SEA-EE-184Rev.1Page9of11ThesuppressionpoolvacuumreliefvalvesuseNamcolimitswitchesforannunciatorinputs.TheseaffiliatedvalvesarepoweredfromClass1Esources.However,thesevalvesandtheirlimitswitchesarenotusedinClass1Ecircuits.Therefore,weldinganannunciatorlimitswitchdoesnoteffectClass1Ecircuits.'.0REFERENCES6.1SEA-EE-183,Rev.0.6.2IEEE279-1971.6.3IEEE384-1974.6.4RegulatoryGuide1.75,Rev.0.jpa/msk018i(18)
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