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| document type = REPORTABLE OCCURRENCE REPORT (SEE ALSO AO,LER), TEXT-SAFETY REPORT
| document type = REPORTABLE OCCURRENCE REPORT (SEE ALSO AO,LER), TEXT-SAFETY REPORT
| page count = 6
| page count = 6
}}
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{{#Wiki_filter:ACCELERATEDDl/RIBUTIONDEMONSTRATIONSYSTEMREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9205010133DOC.DATE:92/04/24NOTARIZED:NOFACIL:50-389St.LuciePlant,Unit2,FloridaPower&LightCo.AUTH.NAME.AUTHORAFFILIATIONSAGER,D.A.FloridaPower&LightCo.RECIP.NAMERECIPIENTAFFILIATION-DocumentControlBranch(DocumentControlDesk)DOCKET05000389
==SUBJECT:==
In-HouseEventRept92-023:on920421,turbinegeneratorfailedtotripduringmanualreactortrip.Rootcauseanalysisstillinprogress.Solenoidvalvesremoved&senttoindependentlabforanalysis..DISTRIBUTIONCODE:IE22DCOPIESRECEIVED:LTRIENCLlSIZE:TITLE:50.73/50.9LicenseeEventReport(LER),IncidentRpt,etc.NOTES:RECIPIENTIDCODE/NAMEPD2-2LANORRIS,JINTERNAL:ACNWAEOD/DOAAEOD/ROAB/DSPNRR/DLPQ/LHFB10NRR/DOEA/OEABNRR/DST/SELB8D~/~S.TPLB8D1REGFILE02FILE01EXTERNAL:EG&GBRYCE,J.HNRCPDRNSICPOORE,W.COPIESLTTRENCL11112,21122111".'111,111111331111RECIPIENTIDCODE/NAMEPD2-2PDACRSAEOD/DSP/TPABNRR/DET/EMEB7ENRR/DLPQ/LPEB10NRR/DREP/PRPB11NRR/DST/SICB8H3NRR/DST/SRXB8ERES/DSIR/EIBLSTLOBBYWARDNSICMURPHY,G.ANUDOCSFULLTXTCOPIESLTTRENCL11221111112211111'"111111DDDNOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEiVASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.20079)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!TOTALNUMBEROFCOPIESREQUIRED:LTTR32ENCL32DD P.O.Box128,Ft.Pierce,FL34954.0128ggI4-8Q.L-92-129U.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555'E:St.LucieUnit2DocketNo.50-389EventDate:April21,1992TurbineTriFailurePleasefindattachedthepreliminaryinternalproblemreportofourplanteventwhichoccurredonApril21,1992.Pursuantto10CFR50.73aLicensedEventReportwillbesubmittedwithin30daysoftheeventdate.Pleasecontactusifthereareanyquestionsaboutthissubmittal.Verytrulyyours,VicePresidentSt.LuciePlantDAS/JJB/kwcc:StewartD.Ebneter,RegionalAdministrator,RegionII,USNRCSeniorResidentInspector,USNRC,St.LuciePlantDAS/PSL4681-925'2050101335'20424PDRADOCK05000385'PDRanFPLGroupcompany ST.LUCIEPLANTINHOUSEEVENTREPORT92-023TURBINEGENERATORFAILEDTOTRIPFOLLOWINGMANUALREACTORTRIPUNIT:2DATE:APRIL21,1992I.INITIALPLANTCONDITIONSOnApril21,1992,St.LucieUnit2wasshuttingdownforascheduledrefuelingoutage.Reactorpowerwasatapproximately12%.II.EVENTDESCRIPTIONAscheduledReactor-TurbineshutdownwasinprogressonUnit2.Duringtheshutdown,powermovedtothetopofthecoreasexpected.ExistingproceduralguidanceonAxialShapeIndex(ASI)wasbeingemployedtominimizeitsaffects.WhenthreeoutoffourLocalPowerDensityPre-TripsonthcReactorProtection.Systemcamein,theNuclearPlantSupervisor(NPS)instructedtheReactorControlOperatorstomanuallytriptheUnit.Amanualreactortripwasinitiated,buttheturbinedidnottrip.SeveralattemptsweremadetotriptheturbineusingtheTurbineTrippushbuttonwithnosuccessandthcNuclearWatchEngineertrippedtheturbinefromthefrontstandard.III.EVENTSEQUENCESt.LucieUnit2wasperformingascheduledreactorshutdownforrefuelingpurposes.DuringtheplantshutdownASIapproacheditsupper(negative)limit.CoordinationatcontrollingASIwithinlimitsandmaintainingreactorcoolanttemperatureduetoXenonbuildinginbecamemoredifficult.Whenreactorpowerwasdecreasedtoabout12%,controlrodinsertionhadnoeffectonmakingASIlessnegativeandthreeofthefourReactorProtectionSystemLocalPowerDensitypre-tripscamein.Atthispoint,theNPSinstructedtheReactorControlOperatorstomanuallytriptheunitandthemanualreactortrippushbuttonsonRTGB(ReactorTurbineGuageBoard)204andRTGB201weredepressedat0238withtheturbinetrippushbuttononRTGB201beingdepressedapproximatelytwosecondslater;however,theturbinedidnottrip.StandardPostTripActionsfromEmergencyOperatingProcedure(EOP)1wereimplemented.Whentheturbinetrippushbuttonwasdepressed,thcGovernorValvesindicatedclosedbuttheThrottleValves,ReheatValves,andInterceptValvesindicatedopen.AutoStopOilandtheEmergencyTripHeaderindicatedpressuresofapproximately100psiand2000psi,respectively.Themegawattrecorderindicatedninetymegawatts.Severalmorcattemptsweremadetotriptheturbineusingthepushbutton,buttheywereunsuccessful.Atthispoint,theReactorControlOperatoropenedtheGeneratoroutputBreakers8W52and8W49,securedthevoltageregulator,stoppedtheDigitalElectrohydraulic(DEH)pumps,closedtheMainStcamIsolationValves(MSIV),andbrokecondenservacuum.IHE¹92-023,4-24-92SHEET1OF3 III.EVENTSEQUENCE(cont'd)TheAssistantNuclearPlantSupervisorinstructedtheNuclearWatchEngineertotriptheturbinefromtheFrontStandard.At0241alltheturbinevalvesclosed.EOP-2,ReactorTripRecovery,wasthencompletedwi'thtwosetsofsatisfactorySafety'unctionStatusChecks,theplantwasstabilized,andtheTurbineShutdownProcedure'asre-entered.IV.EVENTEVALUATIONA)PLANTRESPONSETheplantresponsetothiseventwasasexpectedwiththeexceptionofthefailureoftheturbinetotrip.Uponthereactortripsignal,thefourControlElementDriveMechanism(CEDM)Busundervoltagerelaysshouldde-energize.Thisshouldenergize(open)the20ETsolenoidvalveanddraintheelectro-hydraulicfluidfromtheemergencytripheader(Secattachment¹I).The20ASTtripsolenoidcoilshouldsimultaneouslyenergize,pulldownthemechanicaltriplever,anddumptheautostopoilheader.DecreasingautostopoilpressureallowstheInterfacevalvetoopenanddumptheelecto-hydraulicfluidemergencytripheader.Whenautostopoilpressuredecreasesto45psi,pressureswitches63-1ASTand63-2ASTshouldlockin,actuatingageneratorprimarylockoutwhichtripsthegeneratoroutputbreakers.ThesameresultshouldbeobtainedwhenattemptingtotriptheturbineviatheTurbineTripPushbutton.Amulti-disciplineteamisinvestigatingtodeterminewhytheturbinefailedtotripwhenthetripsignalswereinitiated.B)SAFETYSIGNIFICANCETheplantresponsetothiseventisboundedbysection15.1.5ofthePSLUnit2FinalSafetyAnalysisReport(FSAR),"IncreasedHeatRemovalbytheSecondarySystem"asfurtherdescribedbelow..12%PowerTrip,NoOperatorActionScenario.MSIV'sautocloseat600psig.Cooldownterminated.CoredecayheatreleasedviaMainSteamSafetyValves(MSSV)CooldownrateboundedbylimitingFSARcooldownevent.100%PowerTrip,NoOperatorActionScenario.PossibleSafetyInjectionActuation-Signal(SIAS)butnoactualinjection.AutomaticMSIVclosureafter66seconds.FuelsRETRANanalysisvalidatesthatnocoredamagewilloccur.100%PowerTripwithmultipleFSARChapter15AccidentScenario.Operatorstrainedonthesimulatorformultiplefailureeventsbeyonddesignbasis.ExcessstcamdemandeventsaresimulatedandprocedurallyaddressedbytheEOP's.IHE¹92-023,4-24-92SHEET2OF3 IV.EVENTEVALUATION(cont'd)C)ROOTCAUSEANALYSISAmulti-disciplineTurbineInvestigationTeamisperformingarootcauseanalysisofthisevent.ALetterofInstruction,2-LOI-T-67,"EvaluationofTurbineSolenoidTripFunction,"waswrittentoevaluatetheoperationoftheturbinemanualandautomatictripfunctions.Deficienciesidentifiedarenotedbelow.Rootcauseanalysisisstillinprogress.D)DEFICIENCIESIDENTIFIEDTestingofthc20ETTripsolenoid,20ASTsolenoidvalve,andthe20OPC1and2solenoidvalveswasperformedinaccordancewith2-LOI-T-67.Theresultsofthisevaluationareasfollows:1)20ETSolenoidvalveThcoriginalsolenoidvalvewasremovedtoprescrvcthe"asfound"conditionofthevalve.Anewsolenoidvalvewasinstalledandtestedsatisfactorily.Thisverifiedthe20ETelectricalcircuitsdidnotcontributetothefailures.2)20ASTTripSolenoidThesolenoidwastestednumeroustimeswithtwoofthctestsindicativeofintermittentcircuitproblems.Alooseconnectionwasfoundonrelay62ASTX/pin6.Thisconnectionisinthecircuitforall20ASTtripfunctions.Furthertroubleshootingiscontinuing.3)20OPC1and2SolenoidValvesOneOPCsoleniodvalvewasremovedpriortotestingforpotentialfailuremodeanalysis.TestingofoneoriginalandoncreplacementOPCsolenoidvalveindicatedacceptableoperationoftheOPCcircuits.V.CORRECTIVEACTIONS1.Theoriginal20ET,20OPC-1and20OPC-2Solenoidvalveshavebeenremovedandweresenttoanindependentlaboratoryforanalysis.2.Maintenanceiscontinuingtoinvestigatethcrootcauseoftheintermittentelectricalproblemsofthc20ASTTripSolenoid.Thecircuitsofthe20ETand20OPC1and2Solenoidsarealsobeingevaluatedtoensuresimilarproblemsdonotexist.3.NuclearFuelsisevaluatingadditionalguidanceforASIcontrolattheendofcorelife.4.OperationsisevaluatingadditionalguidanceforEOP-1,"StandardPostTripActions",onactionstotakeforareactortripwithnosubsequentturbinetrip.IHE¹92-023,4-24-92SHEET3OF3 eWESTINGHOUSEELECTRO-HYDRAULICCONTROLSYSTEMANDAUTO-STOPOILSYSTEM~esattttTrtvttvvaalralSCOPL5'7~\rtactttvatvttvtaltarwaavtawaTJtrttvtattaawwwatalarTTLTagZ~~4la~stasttw~slasILWTatTttasttwSavtrgEMERGENCYTRIPSIIIIIIII3IIIlIIIlIIIIIlIIIIIIIlIItwaatwrI~~QOg7~Ttawtaa~aII~tsttataca'vaLvaAUTOSTOPOILPRESSURESWITCHES(3)~acevaLTC~vaatratatalaI~tLava~I~avt1.LOWAUTO-STOPOILPRESSURE(2/3)2.REACTORTRIP('I)3.MANUALTRIP4.HI-HlLEVELINANYS/GSOLENOIDTRIPS1.REACTORTRIP(A)2.ELECTRICALOVERSPEED~3.LOWEHFLUIDPRESSURE4.MANUAL5.ETC.vaccwtavLaoaaa.OL~tattatat/2o-iOPcQo-2opg0roasf0Itat~tLOvsaaaaatvaOVERSPEEDPROTECTIONCONTROLLER103KOFNORMALSPEED2.GENERATOROUTPUTBREAKERSOPENABOVEAPRESETPOWERLEVEL3.CHANGEINGENERATOROUTPUTANDTURBINEINLETPRESSUREAVIOIIOPOILSY5ICII
}}
}}

Revision as of 17:21, 25 April 2018

In-House Event Rept 92-023:on 920421,turbine Generator Failed to Trip During Manual Reactor Trip.Root Cause Analysis Still in Progress.Solenoid Valves Removed & Sent to Independent Lab for Analysis
ML17227A402
Person / Time
Site: Saint Lucie NextEra Energy icon.png
Issue date: 04/24/1992
From: SAGER D A
FLORIDA POWER & LIGHT CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
92-023, 92-23, L-92-129, NUDOCS 9205010133
Download: ML17227A402 (6)
v • d • e


Text

ACCELERATEDDl/RIBUTIONDEMONSTRATIONSYSTEMREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9205010133DOC.DATE:92/04/24NOTARIZED:NOFACIL:50-389St.LuciePlant,Unit2,FloridaPower&LightCo.AUTH.NAME.AUTHORAFFILIATIONSAGER,D.A.FloridaPower&LightCo.RECIP.NAMERECIPIENTAFFILIATION-DocumentControlBranch(DocumentControlDesk)DOCKET05000389

SUBJECT:

In-HouseEventRept92-023:on920421,turbinegeneratorfailedtotripduringmanualreactortrip.Rootcauseanalysisstillinprogress.Solenoidvalvesremoved&senttoindependentlabforanalysis..DISTRIBUTIONCODE:IE22DCOPIESRECEIVED:LTRIENCLlSIZE:TITLE:50.73/50.9LicenseeEventReport(LER),IncidentRpt,etc.NOTES:RECIPIENTIDCODE/NAMEPD2-2LANORRIS,JINTERNAL:ACNWAEOD/DOAAEOD/ROAB/DSPNRR/DLPQ/LHFB10NRR/DOEA/OEABNRR/DST/SELB8D~/~S.TPLB8D1REGFILE02FILE01EXTERNAL:EG&GBRYCE,J.HNRCPDRNSICPOORE,W.COPIESLTTRENCL11112,21122111".'111,111111331111RECIPIENTIDCODE/NAMEPD2-2PDACRSAEOD/DSP/TPABNRR/DET/EMEB7ENRR/DLPQ/LPEB10NRR/DREP/PRPB11NRR/DST/SICB8H3NRR/DST/SRXB8ERES/DSIR/EIBLSTLOBBYWARDNSICMURPHY,G.ANUDOCSFULLTXTCOPIESLTTRENCL11221111112211111'"111111DDDNOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEiVASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.20079)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!TOTALNUMBEROFCOPIESREQUIRED:LTTR32ENCL32DD P.O.Box128,Ft.Pierce,FL34954.0128ggI4-8Q.L-92-129U.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555'E:St.LucieUnit2DocketNo.50-389EventDate:April21,1992TurbineTriFailurePleasefindattachedthepreliminaryinternalproblemreportofourplanteventwhichoccurredonApril21,1992.Pursuantto10CFR50.73aLicensedEventReportwillbesubmittedwithin30daysoftheeventdate.Pleasecontactusifthereareanyquestionsaboutthissubmittal.Verytrulyyours,VicePresidentSt.LuciePlantDAS/JJB/kwcc:StewartD.Ebneter,RegionalAdministrator,RegionII,USNRCSeniorResidentInspector,USNRC,St.LuciePlantDAS/PSL4681-925'2050101335'20424PDRADOCK05000385'PDRanFPLGroupcompany ST.LUCIEPLANTINHOUSEEVENTREPORT92-023TURBINEGENERATORFAILEDTOTRIPFOLLOWINGMANUALREACTORTRIPUNIT:2DATE:APRIL21,1992I.INITIALPLANTCONDITIONSOnApril21,1992,St.LucieUnit2wasshuttingdownforascheduledrefuelingoutage.Reactorpowerwasatapproximately12%.II.EVENTDESCRIPTIONAscheduledReactor-TurbineshutdownwasinprogressonUnit2.Duringtheshutdown,powermovedtothetopofthecoreasexpected.ExistingproceduralguidanceonAxialShapeIndex(ASI)wasbeingemployedtominimizeitsaffects.WhenthreeoutoffourLocalPowerDensityPre-TripsonthcReactorProtection.Systemcamein,theNuclearPlantSupervisor(NPS)instructedtheReactorControlOperatorstomanuallytriptheUnit.Amanualreactortripwasinitiated,buttheturbinedidnottrip.SeveralattemptsweremadetotriptheturbineusingtheTurbineTrippushbuttonwithnosuccessandthcNuclearWatchEngineertrippedtheturbinefromthefrontstandard.III.EVENTSEQUENCESt.LucieUnit2wasperformingascheduledreactorshutdownforrefuelingpurposes.DuringtheplantshutdownASIapproacheditsupper(negative)limit.CoordinationatcontrollingASIwithinlimitsandmaintainingreactorcoolanttemperatureduetoXenonbuildinginbecamemoredifficult.Whenreactorpowerwasdecreasedtoabout12%,controlrodinsertionhadnoeffectonmakingASIlessnegativeandthreeofthefourReactorProtectionSystemLocalPowerDensitypre-tripscamein.Atthispoint,theNPSinstructedtheReactorControlOperatorstomanuallytriptheunitandthemanualreactortrippushbuttonsonRTGB(ReactorTurbineGuageBoard)204andRTGB201weredepressedat0238withtheturbinetrippushbuttononRTGB201beingdepressedapproximatelytwosecondslater;however,theturbinedidnottrip.StandardPostTripActionsfromEmergencyOperatingProcedure(EOP)1wereimplemented.Whentheturbinetrippushbuttonwasdepressed,thcGovernorValvesindicatedclosedbuttheThrottleValves,ReheatValves,andInterceptValvesindicatedopen.AutoStopOilandtheEmergencyTripHeaderindicatedpressuresofapproximately100psiand2000psi,respectively.Themegawattrecorderindicatedninetymegawatts.Severalmorcattemptsweremadetotriptheturbineusingthepushbutton,buttheywereunsuccessful.Atthispoint,theReactorControlOperatoropenedtheGeneratoroutputBreakers8W52and8W49,securedthevoltageregulator,stoppedtheDigitalElectrohydraulic(DEH)pumps,closedtheMainStcamIsolationValves(MSIV),andbrokecondenservacuum.IHE¹92-023,4-24-92SHEET1OF3 III.EVENTSEQUENCE(cont'd)TheAssistantNuclearPlantSupervisorinstructedtheNuclearWatchEngineertotriptheturbinefromtheFrontStandard.At0241alltheturbinevalvesclosed.EOP-2,ReactorTripRecovery,wasthencompletedwi'thtwosetsofsatisfactorySafety'unctionStatusChecks,theplantwasstabilized,andtheTurbineShutdownProcedure'asre-entered.IV.EVENTEVALUATIONA)PLANTRESPONSETheplantresponsetothiseventwasasexpectedwiththeexceptionofthefailureoftheturbinetotrip.Uponthereactortripsignal,thefourControlElementDriveMechanism(CEDM)Busundervoltagerelaysshouldde-energize.Thisshouldenergize(open)the20ETsolenoidvalveanddraintheelectro-hydraulicfluidfromtheemergencytripheader(Secattachment¹I).The20ASTtripsolenoidcoilshouldsimultaneouslyenergize,pulldownthemechanicaltriplever,anddumptheautostopoilheader.DecreasingautostopoilpressureallowstheInterfacevalvetoopenanddumptheelecto-hydraulicfluidemergencytripheader.Whenautostopoilpressuredecreasesto45psi,pressureswitches63-1ASTand63-2ASTshouldlockin,actuatingageneratorprimarylockoutwhichtripsthegeneratoroutputbreakers.ThesameresultshouldbeobtainedwhenattemptingtotriptheturbineviatheTurbineTripPushbutton.Amulti-disciplineteamisinvestigatingtodeterminewhytheturbinefailedtotripwhenthetripsignalswereinitiated.B)SAFETYSIGNIFICANCETheplantresponsetothiseventisboundedbysection15.1.5ofthePSLUnit2FinalSafetyAnalysisReport(FSAR),"IncreasedHeatRemovalbytheSecondarySystem"asfurtherdescribedbelow..12%PowerTrip,NoOperatorActionScenario.MSIV'sautocloseat600psig.Cooldownterminated.CoredecayheatreleasedviaMainSteamSafetyValves(MSSV)CooldownrateboundedbylimitingFSARcooldownevent.100%PowerTrip,NoOperatorActionScenario.PossibleSafetyInjectionActuation-Signal(SIAS)butnoactualinjection.AutomaticMSIVclosureafter66seconds.FuelsRETRANanalysisvalidatesthatnocoredamagewilloccur.100%PowerTripwithmultipleFSARChapter15AccidentScenario.Operatorstrainedonthesimulatorformultiplefailureeventsbeyonddesignbasis.ExcessstcamdemandeventsaresimulatedandprocedurallyaddressedbytheEOP's.IHE¹92-023,4-24-92SHEET2OF3 IV.EVENTEVALUATION(cont'd)C)ROOTCAUSEANALYSISAmulti-disciplineTurbineInvestigationTeamisperformingarootcauseanalysisofthisevent.ALetterofInstruction,2-LOI-T-67,"EvaluationofTurbineSolenoidTripFunction,"waswrittentoevaluatetheoperationoftheturbinemanualandautomatictripfunctions.Deficienciesidentifiedarenotedbelow.Rootcauseanalysisisstillinprogress.D)DEFICIENCIESIDENTIFIEDTestingofthc20ETTripsolenoid,20ASTsolenoidvalve,andthe20OPC1and2solenoidvalveswasperformedinaccordancewith2-LOI-T-67.Theresultsofthisevaluationareasfollows:1)20ETSolenoidvalveThcoriginalsolenoidvalvewasremovedtoprescrvcthe"asfound"conditionofthevalve.Anewsolenoidvalvewasinstalledandtestedsatisfactorily.Thisverifiedthe20ETelectricalcircuitsdidnotcontributetothefailures.2)20ASTTripSolenoidThesolenoidwastestednumeroustimeswithtwoofthctestsindicativeofintermittentcircuitproblems.Alooseconnectionwasfoundonrelay62ASTX/pin6.Thisconnectionisinthecircuitforall20ASTtripfunctions.Furthertroubleshootingiscontinuing.3)20OPC1and2SolenoidValvesOneOPCsoleniodvalvewasremovedpriortotestingforpotentialfailuremodeanalysis.TestingofoneoriginalandoncreplacementOPCsolenoidvalveindicatedacceptableoperationoftheOPCcircuits.V.CORRECTIVEACTIONS1.Theoriginal20ET,20OPC-1and20OPC-2Solenoidvalveshavebeenremovedandweresenttoanindependentlaboratoryforanalysis.2.Maintenanceiscontinuingtoinvestigatethcrootcauseoftheintermittentelectricalproblemsofthc20ASTTripSolenoid.Thecircuitsofthe20ETand20OPC1and2Solenoidsarealsobeingevaluatedtoensuresimilarproblemsdonotexist.3.NuclearFuelsisevaluatingadditionalguidanceforASIcontrolattheendofcorelife.4.OperationsisevaluatingadditionalguidanceforEOP-1,"StandardPostTripActions",onactionstotakeforareactortripwithnosubsequentturbinetrip.IHE¹92-023,4-24-92SHEET3OF3 eWESTINGHOUSEELECTRO-HYDRAULICCONTROLSYSTEMANDAUTO-STOPOILSYSTEM~esattttTrtvttvvaalralSCOPL5'7~\rtactttvatvttvtaltarwaavtawaTJtrttvtattaawwwatalarTTLTagZ~~4la~stasttw~slasILWTatTttasttwSavtrgEMERGENCYTRIPSIIIIIIII3IIIlIIIlIIIIIlIIIIIIIlIItwaatwrI~~QOg7~Ttawtaa~aII~tsttataca'vaLvaAUTOSTOPOILPRESSURESWITCHES(3)~acevaLTC~vaatratatalaI~tLava~I~avt1.LOWAUTO-STOPOILPRESSURE(2/3)2.REACTORTRIP('I)3.MANUALTRIP4.HI-HlLEVELINANYS/GSOLENOIDTRIPS1.REACTORTRIP(A)2.ELECTRICALOVERSPEED~3.LOWEHFLUIDPRESSURE4.MANUAL5.ETC.vaccwtavLaoaaa.OL~tattatat/2o-iOPcQo-2opg0roasf0Itat~tLOvsaaaaatvaOVERSPEEDPROTECTIONCONTROLLER103KOFNORMALSPEED2.GENERATOROUTPUTBREAKERSOPENABOVEAPRESETPOWERLEVEL3.CHANGEINGENERATOROUTPUTANDTURBINEINLETPRESSUREAVIOIIOPOILSY5ICII

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