Text

Control Sys Common Power Failures Evaluation Rept.
	ML18038A079
Person / Time
Site:	Nine Mile Point
Issue date:	06/30/1985
From:	JARVIS C F; GENERAL ELECTRIC CO.
To:	;
Shared Package
ML18038A077	List: ML18038A076; ML18038A078; ML18038A079;
References
	CON-IIT07-450-91, CON-IIT07-474-91, CON-IIT07-475-91, CON-IIT7-450-91, CON-IIT7-474-91, CON-IIT7-475-91, CON-IIT7-476-91 NUREG-1455, NUDOCS 8511070131
	Download: ML18038A079 (242)
	v • d • e

CONTROLSYSTEMSCOMMONPOWERFAILURESEVALUATIONREPORTJUNE1985PREPAREDFORNIAGARAMOHAWKPOWERCORPORATIONNINEMILEPOINTNUCLEARSTATIONUNIT28511070131651104PDRADOCK05000410E

U/620ud/CONTROLSYSTEMSCOMMONPOWERFAILURESEVALUATIONREPORTJUNE1985PREPAREDFORNIAGARAMOHAWKPOWERCORPORATIONNINEMILEPOINTNUCLEARSTATIONUNIT2PREPAREDBYC.F.JARVISGENP3MELECTRICCOMPANYNUCLEARENERGYBUSINESSOPERATIONSSANJOSE,CALIFORNIA95125Approved:W/z.yj~g-A.Koslov,TechLeader-RegulatoryComplianceEngineeringNuclearServicesProductsDepartmentP/~~/gsH.A.SmithManager-RegulatoryComplianceEngineeringNuclearSe'rvi'cesProductsDepartmentFEEE.,C.Eckert,Manager-PlantTransientPerformanceEngineeringPlantPeormanceEngineering.YnSae'tynProjectIicensingEngineerLicensingOperation12-25051

CONTROLSYSTEMSCOMMONPOWERFAILURESEVALUATIONREPORTFORTHENINEMILEPOINTNUCLEARSTATION-UNIT21.0OMECTIVESTheobjectivesofthisCommonPowerFailureEvaluationreportareasfollows:PerformananalysisinresponsetotheNRCconcernstatedinFSARquestion421.42thatthefailuresofpowersources,whichprovidepowerorelectricalsignalstonon-safetycontrolsystems,couldresultinconsequencesoutsidetheboundsoftheNineMilePointNuclearStationUnit2FinalSafetyAnalysisReport(FSAR)Chapter15analysesandwouldrequireactionsorresponsesbeyondthecapabilityofoperatorsoxsafetysystems.Provideadditionalanalyses,asnecessary,toensuretheeffectsoftheworst-caselimitingeventareboundedbythoseoftheeventsanalyzedinFSARChapter15withtheassumptionthatthereisanadditionalsingleactivefailureinareactorsafetysystemrequiredtomitigatetheeffectsoftheevent.ThecontentsofthereportandtheattachmentswerepreparedfortheNiagaraMohawkPowerCorporationbytheGeneralElectricCompany(GE)withasignificanttechnicalcontributionfromtheStoneandwebsterEngineer-ingCorporation(SWEC).

2.0CONCLUSION

STheinformationcontainedherein,supplementedbytheexistingFSARChapter15transientanalyses,documentsanevaluationoftheNineMilePointNucleaStat.'cnUnit2forcontxolsystemsinteractionduetoelectricalpowerfailure.Theconclusionofthisevaluationisthatthelimitsofpeakvesselandmainsteamlinepressures,minimumcriticalpower,ratio(MCPR),andpeakfuelcladdingtemperaturefortheexpectedoperationaloccurrencecategoryoftheidentifiedeventswouldnotbeexceededasaresultofcommonpowersourcefailures.Itshouldbenotedthat,thisstudyusedtheevent-consequencelogicaftheChapt'ir15analysis,butitstartedthelogicchainfromaspecificsource(e.g.'!;asinglebusfailure)ratherthanasystemcondition(e.g.,feed-wat'errunout).Byapproachingthestudyinthismanner,agreatdealofconfidencecanbeplacedinthestudyconclusions.Thesoundnessofthetotalplantdesignisdemonstratedbyitsbeingtolerantoftheseeffects.3.0ANALYSISMETHODOIOGYToachievetheobjectivesdiscussedinSection1,acomprehensivemethod-ologywasdevelopedfortheanalysisofthecontrolsystemscapableofaffectingreactorwaterlevel,pressuxeorpowerintheNineMilePointNuclearStationUnit2.12"25053

TheelectricalcontrolsystemscommonpowerfailureanalysiswasconductedinthefollowingmannerbyGEandSWEC:ACTIVITYASSIGNEDTOoDefineControlSystemsoIdentifyLoadsoDefineBusStructuresoDetermineCriticalLoadsoSummarizeCriticalIoadsoAnalyzeCombinedEffectsoCompareResultstoFSARChapter15GE6SWECGE6SWECSWECGE6SWECGE6SWECoAnalyzeAdditionalSingleFailureinaMitigatingSafetySystemGEoAnalyzeExceptionsoModifyFSARChapter15GE3.1DefineControlSystemsThescopeofcontrolsystemstobeanalyzedwasestablishedbyfirstcompilingacompletelistoftheNineMilePointNuclearStation-Unit2systemsandsubsystems.Next,thelistwasreviewedtoconfinetheanalysistoonlythosesystemswhich,intheirnormal(automatic,ifavailable)controlmode,havethepotentialtoaffect,reactorpressurevessel(RPV)pressure,waterlevel,orpower.Inordertoensurethatallnecessarysystemswereconsidered,certaineliminationcriteria,whichdocumentedthejustificationsfornotanalyzingcertainsystemsfurtherwereappliedtothelistofallplantsystems.Iftherewasanyuncertaintyastowhetherornotasystemmetthecriteria,itwasreta'inedforfurtheranalysis.Thosesystemsthatmetthecriteriaforeliminationwereremovedfromthecompletesystemlist.ReferenceAppendixBfortheeliminationcriteriaandplantsystemslist.',3.2IdentifyLoadsTwosetsofsystembus-loadtableswereassembledbyGEandSWEC,eachprovidinginformationontheloadswithintheirrespectivescopesofsupply.ThesetablescontainedallelectricalloadsoftheremainingcontrolsystemsidentifiedbythemethodologydescribedinParagraph3.1.Eachloadwaslistedwithitspowerbussource,circuitdescription,andfailuremodeonpowerlosswithprimaryandsecondaryeffects.AppendixAistwosheetsfromtheloadtables.TheAppendixAsheetsaretobeusedasanexampleoftheformatofloadtablesthatarethebaselinefromwhichAppendixCwasdeveloped(referenceSections3.4and3.5).12-25054

CONTENTSPARAGRAPH1.02.03.03.13.23.33.43.53.63.73.83.93.10OBJECTIVESCONCLUSIONSANALYSISMETHODOLOGYDefineControlSystemsIdentifyI,oadsDefineBusStructureDetermineCriticalLoadsSummarizeCriticalLoadsAnalyzeCombinedEffectsCompareResultsFSARChapter15AnalyzeAdditionalSingleFailureinaMitigatingSafetySystemAnalyzeExceptionsModifyFSARChapter15ifNecessaryPAGE4.0BUSLOSSSUMMARYRESULTSANDCHAPTER15COMPARISON7FIGURE1ACBUSTREE21FIGURES283DCBUSTREES22FIGURE4UPSBUSTREE23APPENDIXABUSTABLESA"1APPENDIX'B'-'PPENDIXCELIMINATIONCRITERIALOADTABLESB-1C-112"25052

3.3DefineBusStructurePotentialsourcesforcontrolsysteminteractionbyelectricalmeanswereestablishedbyformulatingthebusstructureasfollows:Bustrees(seeSection4.0,FiguresI,2,3,and4)wereconstructedusingelectricalone-linediagraminformationtoshowelectricalpowerdistributionfromthehighestbuslevelnotpreviouslyanalyzed(thehighestlevelprevi-ouslyanalyzedisthelossofoffsitepower)downtothelowestlevelofplantdistxibution(motorcontrolcenters,instrumentbusses,etc.).3.4DetermineCriticalIoadsTheloadswiththepotentialforinitiatingeventsaffectingRPVpressure,waterlevel,andpowerwereidentified.Theeliminationcriteriaestab-lishedearlierforthesystemlist,asdefinedinAppendixB,wereusedinthecomponentreviewtodeterminewhichindividualloadsrequiredfurtherconsiderationorcouldbedeletedfromtheanalysis.Iftherewasanyuncertaintyastowhetherornotaloadmettheeliminationcriteria,itwasretainedforfurtheranalysis.ThenumericalcodeassociatedwithaneliminationcriterionwasassignedtoeacheliminatedloadintheloadtablesdiscussedinParagraph3.2.3.5SummarizeCriticalLoadsNoncriticalloadsweredeletedfromtheloadtables,andtheremainingloadsweregroupedtogetherbytheircommonpowerbusses.ThesetablesareshowninAppendixC.TheprimaryeffectcolumninAppendixCliststhecomponentfailureresultingfromlossofelectricalpower.ThesecondaryeffectisthesystemfailurethatcouldeffectRPVpressure,waterlevelorpower.Insomecasesthereisnoeffect.Becausethisanalysisreviewsallinteractionsthatpotentiallycouldresultinapreviouslyunanalyzedtransient,no>>effectfailuresindicatethesoundnessofplantdesign.3.6AnalyzeCombinedEffectsThisportionoftheanalysisprovidedthebasisfordeterminingtheworstcasecombinationsofsystemfailuresthatarecredibleeventsconsideringtheir,interconnectionbypowerdistribution.Usingthecombinedeffectsof",a",.-:failureatthelowestlevelbusasastartingpoint,thenexthigherbus'~itsthenpostulatedtofail,andthetotaleffectsatthatlevelwereanalyzed.Thisprocesswascontinueduptothehighestbuslevel.ThecombinedeffectsareshownontheAppendixCtablesandworstcaseeffectsforalllevelsaresummarizedinSection4.12"25055

3.7CompareResultstoFSARChapter15Theconsequencesofallpostulatedcontrolsysteminteractioneventsinitiatedbyelectricalmeans,werethencomparedtotheconsequencesoftheeventanalysesdescribedinChapter15oftheFSAR.AreviewoftheinformationintheAppendixCtableswasconductedinthecourseofdevelopingthebussummariesofSection4.Ateachbuslevelofthecombinedeffectsanalysis,thereviewevaluatedtheeffectsastowhethertheywouldbeboundedbytheconsequencesofaspecificChapter15eventanalysis.Section4includestheseevaluationsandconsiderstheworstcaseeffects.3.8AnalyzeAdditionalSingleFailureinaMitigatingSafetySystemTheconsequencesofthepostulatedcommonbuslossevents,detailedinSection4,areallboundedbytheconsequencesofChapter15transients,asdiscussedinSection3.9.Foreachboundedbus-lossevent,themiti-gatingsafetysystemswereidentifiedaccordingtotheFSARChapter15eventdescription.Takingintoconsiderationthebuslosseffects,oneadditionalworstcasesinglefailureinamitigatingsafetysystemwasthenpostulatedforeachevent.Noeventwasidentifiedwhereinabuslosscombinedwithanadditionalsinglefailureinamitigatingsafetysystemwouldcausethefailureofthatsystemtoperformitsintendedsafetyfunction.Asanexampleofthisprocess,considerACBus2SCI-PNLA101fromSec-tion4.0.TheChapter15boundingeventforlossofthisbusistheLossofFeedwaterFlow,describedinNMP2FSAR15.2.7.Theeventscenarioincludesavessellowwaterlevel(L3)scramtripfromtheReactorProtec-tionSystem(RPS),whichperformsamitigatingfunction.ThelossofACBus2SCI-PNLA101togetherwithanadditionalsinglefailureintheRPSwaspostulated.TheRPSwouldnotbeprohibitedfrominsertingthecontrolrodsbyasinglefailure,afunctionrequiredformitigatingtheeffectsofthetransient.ThisprocesswasfollowedforeachmitigatingsafetysystemidentifiedfortheLossofFeedwaterFlowevent.EachmitigatingsafetysystemintheLossofFeedwaterFloweventscenariowasabletoperformitsintendedsafetyfunctionconsideringthebuslossandanadditionalsinglefailure.TheaboveprocesswasrepeatedforeachidentifiedboundingFSARChap-ter15event.3.9Analy'ze'ExceptionsNofa'ilurescenariowasidentifiedwithconsequencesthatwerenotdirectlyboundedbyconsequencesoftheeventanalysesdescribedinFSARChapter15.3.10ModifyFSARChapter15ifNecessaryAsaresultofthisanalysis,nomodificationofFSARChapter15wasfoundtobenecessary.12"25056

4.0BUSIOSSSUt9iARYRESULTSANDCHAPTER15COMPARISONS2NPS-SWG001(Fiure1Iossofthisbuswouldresultinthefollowingeffects:1)RecirculationpumpAstops.2)Oneortwooutofthreecondensateboosterpumpsstop.3)Threeoutofsixcirculatingwaterpumpsstop.4)Oneorbothoftherunningreactorfeedwaterpumpsstop.Threeoutofsixcirculatingwaterpumpsstoppedwilltripthemainturbinein45seconds.Thiswouldcauseareactorscram.Theconsequen-cesofthiseventareboundedbytheTurbineTrip-BypassOn(FSAR15.2.3)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.2.3,LossofrecirculationpumpAandtwoout,oftworunningcondensateboosterpumpswouldresultinatripofreactorfeedwaterpumpsonlowsuctionpressure.Thiswouldcauseareactorscramonlowwaterlevel3.TheconsequencesofthiseventareboundedbytheLossofFeedwaterFlow(FSAR15.2.7)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.2.7.LossofrecirculationpumpA,oneoutoftworunningcondensateboosterpumpsandtwooutoftworunningreactorfeedpumpswouldresultinareactorscramonlowwaterlevel3.TheconsequencesofthiseventareboundedbytheLossofFeedwaterFlow(FSAR15.2.7)event.AnadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedeventasdiscussedinFSAR15.2.7.IossofrecirculationpumpA,oneoutoftwoortwooutofthreerunningcondensateboosterpumpsandoneoutoftworunningreactorfeedpumpswouldresultinrecirculationrunbackandturbinerunback.TheeffectsofthiseventareboundedbytheLossofFeedwaterFlow(FSAR15.2.7)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.2.7.Thelossoflowerlevelassociatedbuses,ifunabletoswitchtoalternatepower,;buses,couldresultinsomeofthefollowingeffects:turbinetrip,parti'il'eedwaterheatingloss,oneortwocondensatepumpsstop,decreaseinmaiiicondenservacuum,andrecirculationrunbackwithturbinerunback.Thelossofbus2NPS-SWG001envelopestheseeffects,exceptfeedwaterheatinglossandturbinetrip.Feedwaterheatinglosseffect,duetosinglefailurecriteria,cannotbeworsethantheeffectdescribedforthelowerbuswiththelargestfeedwatertemperaturedrop.Therefore,analy-sesoflowerbuseswillaccountforturbinetriporfeedwaterloss.Feedwaterheatinglosseffectismitigatedbyrecirculationrunbackorlossoffeedwaterflow.Turbinetripenvelopsrecirculationrunbackorlossoffeedwaterflow.12-25057

2NNS-SWG011(Fiure1Lossofthisbuswouldresultinthefollowingeffects:1)Recirculationlow-frequencymotorgeneratorsetAinoperative(doesnotcompromisenormalpoweroperation).2)Oneofthree50~capacityturbinebuildingclosedloopcoolingwaterpumpsstop,causingstandbypumptostartonlowdischargeheaderpressure.3)Oneortwooutofthreecondensatepumpsstop.4)Oneofthreefourthpointheaterdrainpumpsinoperative.Lossoftwooutoftworunningcondensatepumpsandfourthpointheaterdrainpumpwouldresultinatripofreactorfeedpumpsonlowsuctionpressure.Thiswouldcauseareactorscramonlowwaterlevel3andtheconsequencesofthiseventareboundedbytheLossofFeedwaterFlow(FSAR15.2.7)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresult.inaboundedevent,asdiscussedinFSAR15.2.7.Lossoftwooutofthreerunningcondensatepumpsandfourthpointheaterdrainpumpwouldresultinarecirculationrunbackwithturbinerunback.TheeffectsofthiseventareboundedbytheLossofFeedwaterflow(FSAR15.2.7)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.2.7.Lossofoneoutoftworunningcondensatepumpsandfourthpointheaterdrainpumpwouldresultinstandbycondensatepumpstartupandpartialfeedwaterheatingloss.Lossoffourthpointheaterdrainpumpwouldincreaseheaterleveluntilthelevelcontrolvalveopenstodumptomaincondenser.TheeffectsofthiseventareboundedbytheLossofFeedwaterHeating(FSAR15,1.1)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.1.1.2NNS"SWG012Fiure1Lossofthisbuswouldresultinthefollowingeffects:1)-40neofthree50$capacityturbinebuildingclosedloopcoolingwater:.-g'umpsstop,causingstandbypumptostartonlowdischargeheader'"<<,p'ressure.2)Oneofthree50$capacityreactorbuildingclosedloopcoolingwaterpumpsstop,causingstandbypumptostart,onlowdischargeheaderpressure.3)Oneofthreefourthpointheaterdrainpumpsinoperative.12"2505g

Iossoffourthpointheaterdrainpumpwouldincreaseheaterleveluntillevelcontrolvalveopenstodumptomaincondenser.TheeffectsofthiseventareboundedbytheLossofFeedwaterHeating(FSAR15.1.1)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.1.1.2NNS-SWG014(Fiure1)IossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2NJS-US5(Fiure1)LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2NHS-MCCOll(Fiure1)LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2NHS-MCC014A(Fiure1)Lossofthis'usdoesnotaffectRPVpressure,waterlevel,orpower.2NHS-MCC006A(Fiure1IossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2IHS-PNL003(Fiure1)I,ossofthisbusleveldoesnotaffectRPVpressure,waterlevel,orpower.2NJS-US4A(Fiure1LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2SCI-PNL100(Fire1)Lossofthisbuswouldresultinthefollowingeffects:2)3)Threeofthreecondensateboosterpumprecirculationvalvesfailopen.soireeofthreereactorfeedpumprecirculationvalvesfailopen.*Condensatepumprecirculationvalveopens.4)Steamlinedrainvalvefailsopen.5)Scavengingsteamvalvesfailopen.6)Offgasisolationvalvecloses,offgascondenserfillswithwaterandoffgasvacuumpumpsmaytrip.10-17-8512"25059

7)Generatorcoolinghydrogensupplyisolationvalvesfailsclosed.8)Numerouscontrolcircuitandvalvefailurescausemaincondenserwaterlevelincrease,andpartialfeedwaterheatingloss.9)Twooftwocleansteamreboilersdisabled.Openingofthreeofthreecondensateboosterpumprecirculationvalves,threeofthreefeedwaterpumprecirculationvalvesandcondensatepumprecirculationvalveresultsinatripofreactorfeedpumpsonlowsuctionpressure.Thiswouldcauseareactorscramonlowwaterlevel3.Theturbinetrip,maincondenservacuumloss,andpartialfeedwaterheatinglosseffectsassociatedwiththeothercomponentfailuresareeclipsedbythetripofreactorfeedpumpsonlowsuctionpressureeffect.Theconse-quencesofatripofreactorfeedpumpsonlowsuctionpressureeventareboundedbytheLossofFeedwaterFlow(FSAR15.2.7)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.2.7.2SCI-PNLA101(Fiure1)Lossofthisbuswouldresultinthefollowingeffects:1)Twoofthreecondensateboosterpumprecirculationvalvesfailopen.2)Scavengingsteamfeedwaterheaterinletvalvesfailclosed.3)Scavengingsteamvalvesfailclosed.4)Lossofthird/sixthpointheaterhighwaterlevelisolationsignals.Highwaterprotectionmaintainedthroughnon-returnvalve.5)Mainsteamlinedrainvalvesfailopen.6)Twoofthreereactorfeedpumprecirculationvalvesfailopen.7)Twoofthreefourthpointheaterdrainpumprecirculationvalvesfailopen.8)LossoffourthpointheaterdrainpumpsASCfirst/secondpointheaterwaterlevelhightripsignalandsixthpointheaterlevelcontrolvalvesABCautoclosesignals.9)~j';Oneoftwocleansteamreboilersdisabled(otherreboileravailable).Openingoftwoofthreecondensateboosterpumpandtwoofthreereactorfeedpumpsrecirculationvalvesresultsinatripofreactorfeedpumpsonlowsuctionpressure.Thiswouldcauseareactorscramonlowwaterlevel3.Thefeedwaterheatinglossassociatedwiththeotherbuscompon-entfailuresiseclipsedbythetripofreactorfeedpumpsonlowsuctionpressureevent.TheconsequencesofatripofreactorfeedpumpsonlowsuctionpressureeventareboundedbytheLossofFeedwaterFlow(FSAR15.2.7)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.2.7.12-250510

2SCI-PNLA102Fiure1)Lossofthisbuswouldresultinthefollowingeffects:1)Oneofthreecondensateboosterpumprecirculationvalvesfailopen.2)Oneofthreereactorfeedwaterpumprecirculationvalvesopens.3)LossoffourthpointheaterdrainpumpBfirst/secondpointheaterwaterhighleveltripsignalandsixthpointheaterlevelcontrolvalveBautoclosesignals.4)Fourthpointheaterdrainpumprecirculationvalveopens.5)TurbineCVsteamleaddrainvalvesfailopen.6)Oneoftwocleansteamreboilersdisabled(otherreboileravailable).Openingofcondensateboosterpumpandfeedwaterpumprecirculationvalveswouldcausearecirculationrunbackwithturbinerunback.TheeffectsofthiseventareboundedbytheLossofFeedwaterFlow(FSAR15.2.7)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.2.7.2SCI-PNLA103Fiure1)I,ossofthisbuswouldresultinthefollowingeffects:1)Offgasisolationvalveclosesandoffgascontrolsarelost.2)MoistureseparatordrainreceivertankAemergencydraincontrolvalvesfailopen.3)MoistureseparatorreheaterdrainreceivertankBemergencydraincontrolvalvesfailopen.4)Heaterdrainvalvesandlevelcontrolvalvesfailinopenorclosedposition.Isolationofoffgassystemandotherbusassociatedcomponentfailuresresultinpartialfeedwaterheatingloss,maincondenservacuumdecrease,anddelayedturbinetrip.ki'SCI-,PNLB101(Fiure1)Lossofthisbuswouldresultinthefollowingeffects:1)Mainsteamforcleansteamreboilersforturbinegeneratorglandsealislost.2)Offgasauxiliarysteamlowpointdrainvalvefailsopen.3)Condensatepumpsrecirculationvalvefailsopen.12-250511

4)Scavengingsteaminletvalveandisolationvalvesfailclosed.5)Heaterheaderdrainvalvesfailopen.6)Turbinegeneratorglandseal,exhauststeam,andauxiliarysteamdrainvalvesfailopen.7)Generatorcoolinghydrogensupplyisolationvalvesfailclosed.S)Instrumentaircompressorsautostartsignallostandserviceairisolationvalvefailsclosed.9)Mainsteamdrainvalvesfailopen.10)Moistureseparatorreheatermainsteamsupplyvalvesfailclosed.11)Isolationvalveclosuredisablesglandsealsteamauxiliarysupplybackupforcleansteamreboilers.Openingofcondensatepumpsrecirculationvalveandotherbusassociatedcomponentfailuresresultinrecirculationrunbackwithturbinerunback.Theeffectsofthisevent(recirculationrunbackwithturbinerunback)areboundedbytheLossofFeedwaterPlow(PSAR15.2.7)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinPSAR15.2.7.Closureofgeneratorcoolinghydrogensupplyisolationvalvescouldcauseaturbinetrip.TheconsequencesofthiseventareboundedbytheTurbineTrip-BypassOn(PSAR15.2.3)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdis-cussedinFSAR15.2.3.2SCI-PNLB103Fiure1)Lossofthisbuswouldresultinthefollowingeffects:1)MoistureseparatordrainreceivertankBemergencydraincontrolvalvesfailopen.2)MoistureseparatorreheaterdrainreceivertankBemergencydraincontrolvalvesfailopen.3)-~Second,third,fourth,fifth,sixthpointheaterdrainvalvesand;~levelcontrolvalvesfailopen.4)Capabilitytoshutdown1Aand1Boffgastrainsonhighhydrogenconcentrationlost.Openingofemergencydraincontrolvalveswouldincreasemaincondenserwaterlevelandreducefeedwatertemperature.Iossofthisbusresultsinpartiallossoffeedwaterheating.TheeffectsofthiseventareboundedbytheLossofFeedwaterHeating(FSAR15.1.1)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.1.1.12-250512

2NJS-PNI400Fiure1Lossofthisbuswouldresultinthefollowingeffects:1)LFMGAinoperative.2)LFMGBinoperative.3)Turbinebuildingclosedloopcoolingwatermakeupvalvefailsopen,causingtripofallthreecoolingwaterpumps.4)Extractionlinedrainvalvesforthird,fourth,fifth,sixthpointheatersfailopen.5)Reheatsteamloadcontrolandpipingdrainvalvefailsopen.6)Turbinerunbackongeneratorstatorlossofcoolingcapabilitylost.7)Oneoftwo100$capacityoffgasvacuumpumpstop,causingstandbypumptostart.Tripofallthreeturbinebuildingclosedloopcoolingwaterpumpsresultsiaadelayedturbinetrip..TheconsequencesofthiseventareboundedbytheTurbineTrip-BypassOn(FSAR15.2.3)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussediaFSAR15.2.3.NOTE:Thepowerdistributionforthesepumpsisbeingrevisedtoavoidlosingallthreepumps.SucharevisioncouldpreventanyeffecttoRPVpressure,waterlevel,orpower.Openingofextractionlinedrainvalveswouldresultinpartiallossoffeedwaterheating.TheeffectsofthiseventareboundedbytheLossofFeedwaterHeating(FSAR15.1.1)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdis"cussedinFSAR15.1.1.Busesancilliaryto2NJS-PNL400willhaveaneffectonfeedwatertempera-turelessthanthatofbus2NJS-PNL400".2NHS-MCC015AFiure1Loss'~~ofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2NHS-.MCC015CFiure1)LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2NJS-US10A(Fiure1LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.12-250513 K

I2NHS-MCC010AFiure1)ILossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2NHS-MCCOlOCFiure1LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2NJS"US10C(Fiure1)LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2NPS-SWG003(Fiure1)Lossofthisbuswouldresultinthefollowingeffects:1)RecirculationpumpBstops.2)Oneortwooutofthreecondensateboosterpumpsstop.3)Threeoutofsixcirculatingwaterpumpsstop.4)Oneorbothoftherunningreactorfeedpumpsstop,Threeoutofsixcirculatingwaterpumpsstoppedwilltripthemainturbinein45seconds.Thiswouldcauseareactorscram.Theconse-quencesofthiseventareboundedbytheTurbineTrip-BypassOn(FSAR15.2.3)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinboundedevent,asdiscussedinFSAR15.2.3.LossofrecirculationpumpBandtwooutoftworunningcondensateboosterpumpswouldresultinatripofreactorfeedpumpsonlowsuctionpres-sure.Thiswouldcauseareactorscramonlowwaterlevel3.Theconse-quencesof.thiseventareboundedbytheLossofFeedwaterFlow(FSAR15.2.'7)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.2.7.LossofrecirculationpumpB,oneoutoftworunningcondensateboosterpumpsandtwooutoftworunningreactorfeedpumpswouldresultinareactorscramonlowwaterlevel3.TheconsequencesofthiseventareboundedbytheLossofFeedwaterFlow(FSAR15.2.7)event.AnadditionalsinglefailureinamitigatingsafetysystemalsowouldresultinaboundedeventasdiscussedinFSAR)5.2.7.Los~s~gofrecirculationpumpB,oneoutoftwoortwooutofthreerunningcondensateboosterpumpsandoneoutoftworunningreactorfeedpumpswouldresultinrecirculationrunbackandturbinerunback.TheeffectsofthiseventareboundedbytheLossofFeedwaterFlow(FSAR15.2.7)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.2.7-12-250514 7l('<<IA$/f Thelossoflowerlevelassociatedbuses,ifunabletoswitchtoalternatepowerbuses,couldresultinsomeofthefollowingeffects:turbinetrip,recirculationrunbackwithturbinerunback,andpartialfeedwaterheatingloss.Thelossofbus2NPS-SWG003envelopestheseeffects,exceptfeed-waterheatinglossandturbinetrip.Partialfeedwaterheatinglosseffect,duetosinglefailurecriteria,cannotbeworsethantheeffectdescribedforthelowerbuswiththelargestfeedwatertemperaturedrop.Therefore,analysesoflowerbuseswillaccountforturbinetriporfeedwaterloss.Feedwaterheatinglosseffectismitigatedbyrecircu-lationrunbackorlossoffeedwaterflow.Turbinetripenvelopsrecircu-lationrunbackorlossoffeedwaterflow.2NNS-SWG013(Fiure1)Lossofthisbuswouldresultinthefollowingeffects:1)RecirculationlowfrequencymotorgeneratorsetBinoperative.2)Oneofthree50$capacityreactorbuildingclosedloopcoolingwaterboosterpumpsstops,causingstandbypumptostart.Oneofthree50$capacityturbinebuildingclosedloopcoolingwaterpumpsstops,causingstandbypumptostart.4)Oneortwooutofthreecondensatepumpsstop.5)Fourthpointheaterdrainpumpinoperative.Lossoftwooftworunningcondensatepumpsandfourthpointheaterdrainpumpwouldresultinatripofreactorfeedpumpsonlowsuctionpressure.Thiswouldcauseareactorscramonlowwaterlevel3.TheconsequencesofthiseventareboundedbytheLossofFeedwaterFlow(FSAR15.2.7)event.AnadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedeventasdiscussedinFSAR15.2.7.Lossoftwooutofthreerunningcondensatepumpsandfourthpointheaterdrainpumpwouldresultinrecirculationrunbackwithturbinerunback.TheeffectsofthiseventareboundedbytheZossofFeedwaterFlow(FSAR15.2.7)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.2.7.Loss,-ofoneoftworunningcondensatepumpsandfourthpointheaterdrainpump',wouldresultinstandbycondensatepumpstartup.Lossoffourthpointheateii.*'drainpumpwouldincreaseheaterleveluntillevelcontrolvalveopenstodiimptomaincondenser.TheeffectsofthiseventareboundedbytheL'ossofFeedwaterHeating(FSAR15.1.1)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.1.1.2NNS-SWG015(Fiure1LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.10-17-8512-250515

LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2NHS-MCC012Fiure1LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2NHS-MCC014B(Fiure1Lossofthisbusdoesnotaffect,RPVpressure,waterlevel,orpower.2NHS-MCC006B(Fiure1)LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2NJS-US4BFiure1)LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2NJS-PNL745Fiure1)LossofthisbusdoesnotaffectRPVpzessure,waterlevel,orpower.2NJS-MCC015B(Fiure1LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2NJS-USlOB(Fiure1LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2NHS"MCC010B(Fiure1)LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2BYS-SWG001A(Fiure2)Lossofthisbusandancilliarybuses2BYS-PNLAlOl,2BYS-PNLA102,and2BYS-PNIA107doesnotaffectRPVpressure,waterlevel,orpower.2BYS-SWG001BFiure3Loss<'ofthisbuswouldresultinthefollowingaffects:1)'RecirculationlowfrequencymotorgeneratorsetsAandBinoperative.2)Variouspumpbreakerscloseandtripcircuitsdisabled,causingnointerruptionofrunningpumps.3)Instrumentaircompressorcoolingwatervalvesfailopen,unloadervalvesfailclosed,andbreakercloseandtripcircuitsdisabled.4)XossoffeedwatercontrolloopBflowsignal.12-250516

Afteraperiodoftime,airreceivertanklowpressurewillbeannunciatedinmaincontrolroom.Shouldnooperatoractionbetakentoshutdownreactor,thefollowingeffectscouldresult:1)Controlroddrive-system-Thescraminletandoutletvalveswillopen,shuttingdownthereactor.TheCRDflowcoatrolvalvewillclosetoapproximately2percentopen.Thedrainandventvalvesforthescramdischargevolumewillclose.2)Thesteamsupplyvalvestothcsteamjetairejectorswillclose,eveatuallyresultinginlossofcondenservacuum.3)TheKSRblock(admissionvalves)willclose.4)Thestandbygastreatmentsystemwillaligaitselftotakesuctionfromthesecondarycontainment.5)TheRCICsteamlinedrainandRHRheatexchangersteamsupplycontrolvalveswillcloseuponlossofair.TheRHRheatexchangersteamsupplyisnormallyclosedbyamotor-operatedvalve.RHRsteamsupplycontrolvalvesalsoarenormallyclosed.6)Theminimumflowbypassesforthecondensate,condensatebooster,andfeedwaterpumpswillopen,bypassingfeedwatertothecondenser.ThiscouldcausethereactoxwaterleveltodroptoIevel3,therebyinitiatingascramsignal.7)Automatichotwelllevelcontrolislostastheair-operatedmakeupvalvefailsopen.Rejectvalvesfailclosed.8)Standbyliquidcontrol-Thelevelindicationforthestoragetankwilldecreasetozero.9)HSIVwillreceivea"Close"signalduetolossofcondenservacuumoron"lessthan850psiginRun."Theconsequencesofeffects1,2,and3arcboundedbytheLossofInstru-mentAir(FSAR15.0.5)event,.Aaadditionalsinglefailureinamitigat-ingsafetysystemwouldalsoresultinabouadedeveat,asdiscussedinFSAR15.0.5.Loss..offeedwatercontrolloopBflowsignalwouldresultinamainturbine..triponreactorhighwaterlevel.Theconsequencesofthiseventarc':~~boundedbytheFeedwaterControllerFailure-MaximumDemand(FSAR15;-.1'.2)=;event.Anadditionalsinglefailureiaamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.1.2.2BYS-PNLB101(Fire3)Iossofthisbuswouldresultinamainturbinetriponhighwaterlevel.TheconsequencesofthiseventareboundedbytheFeedwaterControllerFailure-MaximumDemand(FSAR)5.1.2)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.1.2.12"250517

2BYS-PNLB107(Fiure3LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2VBS-PNLA101Fiure4Lossofthisbuswouldresultinthefollowingeffects:1)RecirculationAandBflowremainatlastflowrateandcannotbechanged.2)Reactorcontrolrodscannotbemoved(scramcapabilityavailable).~3)Reactorfeedwaterpumprecirculationvalvesfailopen(backuppowerfrom2VBS-PNLB101).4)Condensatepumprecirculationvalvesfailopen(backuppowerfrom2VBS"PNLB101).5)Condensateboosterpumprecirculationvalvesfailopen(backuppowerfrom2VBS-PNLB101).6)Loadreferencesignallost,causingreactorscram(backuppowerfrompermanentmagnetgenerator).7)Fourthpointheaterlevelvalvesfailclosedanddrainpumpsdisabledbackuppowerfrom2VBS-PNLB101).8)Turbinetripfunctionslost(backuppowerfrompermanentmagnetgenerator).9)Turbinerunbackcapabilitylost.10)Turbineelectrohydrauliccabinetcontrolcircuitlost(backuppowerfrompermanentmagnetgenerator).ll)Steambypassandpressureregulationsystembypassfastactingandinterceptvalvesclose(backuppowerfrompermanentmagnetgenerator).LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpoweriffailurescenarioallowsproperfunctionofbackuppower.Should.-'ossofbackuppowerfrom2VBS-PNLB101alsobepartofthebusfailuriscenario,theresultwouldbeatripofreactorfeedwaterpumpsonlow"suctionpressure.Thiswouldcauseareactorscramonlowwaterlevel3.TheconsequencesofthiseventareboundedbytheLossofFeedwaterFlow(FSAR15.2.7)event.Anadditionalfailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.2.7.12"250518

~~Shouldlossofbackuppowerfromthepermanentmagnetgeneratoralsobepartofthebusfailurescenario,theresultwouldbeturbinetripwithsteambypassdisabled.TheconsequencesofthiseventareboundedbytheTurbineTrip(FSAR15.2.3)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdis-cussedinFSAR15.2.3.2VBS-PNLA102(Fiure4)Shouldlossofbackuppowerfrom2VBS-PNLB102alsobepartofthebusfailurescenario,theresultwouldbethefollowingeffects:1)Moistureseparatorandreheaterdrainreceivercontrolnormaldrainvalvesfailclosedandemergencydrainvalvesfailopen.2)Twooutoftwomoistureseparatorweheatersinoperative.3)Twooftwocleansteamreboilerssteamsupplyaredisabled(auxiliarysteamistobeused).4)Mainsteamdrainvalvesfailopen.:Failureofnormaldraincontrolvalvesinclosedpositionandemergencydrainvalvesinopenpositionresultsinpartiallossoffeedwaterheat-ing.TheeffectsofthiseventareboundedbytheLossofFeedwaterHeating(FSAR15.1.1)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.1.1.2VBB-UPS3A(Fiure4ShouldlossofbackuppowerfromDCbusbatteriesandalternateACbuspoweroccur,thefollowingsignificanteventswouldresult:2)InadvertentDivision1LOCAsignal(see2VBS*PNLA103busbelow).ReactorrecirculationautomaticflowcontrolneutronfluxchannelCandEsignalslost.While,becauseoftheDivision1LOCAsignal,recirculationloopAflowremainsconstant,thelossofneutronfluxchannelCandEsignalsduringautomaticflowcontrolwillincreaserecirculationloopBflow.Thiswoul'd;,r'esultinareactorscramonhighfluxoccurringbeforehighdrywellpres'sure".Theconsequencesofthiseventareboundedbytherecirculationflow~controlfailurewithincreasingflow(FSAR15.4.5)event.AnadditionalfailureinamitigatingsafetysystemwouldalsoresultinaboundedeventasdiscussedinFSAR15.'4.5.10-17-8512"250519

FR0115435107od)089d18~51~198512)56Po2VBS*PNLA103Fiura4LossofthisbuswouldgenerateaainadvertentDivision1LOCAsignalresultinginthefollowiagsignificanteveats:1)Reactordrywellisolation.2)Drywallunitcoolercoolingcapacityreduced.3)ReactorrecircualationloopAflowcontrolvalvesignallosslock-up;flowremainsconstant.Ifoperatoractionisnottakea,thecombineddrywallisolationandpartialcoolinglossMillincreasedrywelltemperature,humidityandpressure,causingahighdrywellpressurescramandreactorECCSactiva"tion.TheconsequencesoftheseeventsareboundedbytheLOCAInsidePrimaryContainment(FSAR15.6.3)spectrumofeventsandinadvertentHPCSStartup(FSAR1$.5.1)~AnadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultiaaboundedeventasdiscussediaCESAR15.6.5.2.3.2VBS*PNLA104Piuze4LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2VBS-PNLB101Piure4Shouldlossofbackuppowerfor2VBS-PNLA101alsobepartofthebusfailurescenario,theresultwouldbethefollowingeffects:1)RecirculationAandBflowremainsatlastflowrateandcannotbechanged.2)Reactorcontrolrodscannotbemoved,scramcapabilitynotcom-promised.3)Peedwaterflowcontrolvalveslockatlastposition.4)Condensateboosterpumprecirculationvalvesfailopen(backuppowerfrom2VBS-PNLA101).5)Reactorfeedwaterpumprecirculationvalvesfailopen(backuppower-'~>'from2VBS-PNLA101).Wg~c~6).'Condensatepumprecirculationvalvefailsopen(backuppowerfrom2VBS"PNLA101)~10-31-8512-250520

7)Fourthpointheaterdrainpumpsinoperative.Openingofrecirculationvalvestothecondensatepump,condensateboosterpump,andfeedwaterpumpwouldresultinatripofreactorfeedwaterpumpsonlowsuctionpressure.Thiswouldcauseareactorscramonlowwaterlevel3.TheconsequencesofthiseventareboundedbytheIossofFeedwaterFlow(FSAR15.2.7)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdis-cussedinFSAR15.2.7.2VBS-PNLB102(Fiure4)Lossofthisbuswouldresultinthefollowingeffects:1)Twooftwomoistureseparatorreheatersinoperative.2)Moistureseparatorandreheaterdrainreceivernormaldraincontrolvalvesfailclosedandemergencydrainvalvesfailopen.3)Twooftwocleansteamreboilerssteamsupplyaredisabled(auxiliarysteamistobeused).4)Mainsteamdrainvalvesfailopen.IossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower,iffailurescenarioallowsproperfunctionofbackuppower.Shouldlossofbackuppowerfrom2VBS-PNLA102alsobepartofthebusfailurescenario,failureofnormaldraincontrolvalvesinclosedposi-tionandemergencydraincontrolvalvesinopenpositionresultsinpartiallossoffeedwaterheating.TheeffectsofthiseventareboundedbytheLossofFeedwaterHeating(FSAR15.1.1)event.Anadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedevent,asdiscussedinFSAR15.1.1.2VBS-PNLB108(Fiure4)LossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.2VBS-UPS3BFiure4Should'.-',lossofback-uppowerfromDCbusbatteriesandalternateACbuspowei',.".be'artofthebusfailurescenario,thefollowingsignificanteventwould>>occur:1)InadvertentDivision2LOCAsignal(see2VBS-PNLA103busbelow).Ifnotmanuallycontrolled,theincreasingdrywelltemperatureandpres-surewillcauseahighdrywellpressurereactorscramandECCSactivation.TheconsequencesoftheseeventsareboundedbyLOCAInsidePrimaryContainment(FSAR15.6.5)spectrumofeventsandInadvertentHPCSStartup(FSAR15.5.1).AnadditionalsinglefailureinamitigatingsafetysystemwouldalsoresultinaboundedeventasdiscussedinFSAR15.6.5.2.3.10-17-8512"250521

2VBS*PNLB103(Fiure4Iossof.thisbuswouldgenerateaninadvertentDivision2LOCAsignalresultinginthefollowingsignificantevents:1.Reactordrywellisolation.2.Drywellunitcoolercoolingcapacityreduced.3.ReactorrecirculationloopBflowcontrolvalvesignallosslock-up;flowremainsconstant.Ifoperatoractionisnottaken,thecombineddrywellisolationandpartialcoolinglosswillincreasedrywelltemperature,humidityandpressure,causingahighdrywellpressurereactorscramandECCSactiva-tion.TheconsequencesoftheseeventsareboundedbytheLOCAInsidePrimaryContainment(FSAR15.6.5)spectrumofeventsandInadvertentHPCSStartup(FSAR15.5.1).AnadditionalfailureinamitigatingsafetysystemwouldalsoresultinaboundedeventasdiscussedinFSAR15.6.5.2.3.2VBS-PNLB104(Fiure4)IossofthisbusdoesnotaffectRPVpressure,waterlevel,orpower.10-17-8512-250521A

EHCLOSUREIZNPS.SWGOOIZNNS.SWGOIIZNNSSWGOIIZNJSU55IZNHSMCCOIINO2HHS-5WG012I2HHSSWG0132HHSSWG015tHJ5.U562HHS-MCCOIZII2HPSSWG0032NJSUSZAZNH5MccoltA2<<JS.USGA2NHS~MCCOISA2NJSU59AZNJSUSIOA2NHS.MCCOI0AZNJSUS3A2NHS-MCCOOGA2NJSUS%AZHJSUstcZHHSMCCOIIC2HJSU59C2HHS.MCCOIscZHJSU59CZHJSUSIOC2HHS~MCCOIOCZHJS.US3CZHJSPHL3002IHS.PHL003ZHHSMCC006C2HJSUSMCNONONONONoNoNONONONO2HJsUSZBZHHSMCCOIAB2HJSUSIBtHHSMCCO1582HJSU5982HJS.USIOBZHHS~MCCOIOBZHJS.US38ZHHS-MCC0068ZHJ5US@8AL76BNA76TZSCIPNLIOOI25CI-PNLAIOII25CIPNLAIOZ2SCIPNLAI0325CIPNLBIOI2SCIPHLBI03ZHJSPHLIOOZSCA-PHLi00ZSCAPHL<OIZSCA.PHL40325CAPHL<04ZHJS-U57AF'fGUREIAC8USTREEZHJSUS782HJS.PHL7052HJSPHL7iS

ENCLOSUREIFROM2NJS-US5IIIII2BYS-CHGRIAIFROM2NJS-USGIIII2BYS-CHGRIBIIIIII2BYS-BATIAII~III2BYS-SWGOOIA2BYS-PNLAIOI2BYS-PNLAI022BYS-PNLAIO72BYS-BATIBIIIII2BYS-SWGOOIB2BYS-PNLBIOI2BYS-PNLBI07FIGURE2OCBUSTHEE"A"FIGURE3DCBUSTREE"8"

ENCLOSURElp....yFROMZHJSUSSIFROMZVBB.PNL300IFROM2NJS-US6IFROMZBYS-SWGOOIAIIIBACKUPZVBB-UPSIAIIIIIIALTERHATEiHORMALINORMAL2VBBUPSIBFROM28YS-SWGOOIBIIIALTERNATEBACKUPZVBS-PHLAIOI2VBS-PNLAI022VBS-PHLBIOII2VBS.PHLBI02)ZVBS-PNLBIOSFROMZHJS.PHL500FROMZLAT-PNLIOOFROM2HJSPHL402FROM2HJS-PHL600BACKUPALTERNATEHORMALHORMALALTERHATEBACKUPZVBB-UPS3A2VBB-UPS38IZVBSiPNLAI032VBS+PHLAI04IZVBS<PHLBI032VBSiPNLBI04FIGURE4UPSTREE

lttRÃIIRA%8TASLRS{RIAIFiR)IffeNRNISN{S)ISfe{~;CO.IRSNIPTIM/ISUSSSCaeSO.Ri'm.'.""neCnoeIl1IIIARTRffRCTSSRCORDARTRffRCTSIIOfNRRffRCTSCNSTHSRffRCfSIINSfNIAI~ICI2AIfN2SI{TO)NO4IDafIDIStLATI22IIfSIYOtIDIStuTI~OSSXIINNJIAIIfS50ltf5502YQ:{aataCTIINOULRIIlltMYNSASDIIalSC5%STATUSIIIIIIISWTYOROISDIDSYRCTOeDIStLATI22TSWTYOMS~IOSYRC5%DIStIAYI22ILOSRSODASDDRYRCYOe/'SORRIDIStLAYIIOICATINtSIK%NSAÃDDRYS'%DlStfhfINDICATIONS{llXSNNASDDRYRCfMNORRIDIStLAYISDICAYIOFSIIIIIIIII{II0;IIK1M4ICOOLSNO~REfOETIDIStLAYtASRLIDISHYIfNIIfAOLTINStEATFNLTADA)IIAtCARD)ORLRDIIAtIIIIMSRSIStLATtQNLIfNI,SACREDUtbYIAweeuYCSrim)2VSSblOItOMSAIIDlttfATtAILNSM)fAULTIQtIII{IIIIINRN{NCD

APPENDIZAEUSTAELES(EEheLE)~I~)PQKRSOURCE($)ISTSIONIPID)DESCRIPTION/IbUSESEFMRSCKTSNO.kPNO.FUNCTIONPRIMARTEFFECTSII2NPS-SNOWSIIOWl2P2L,CONDENSATEbOOSTHtICNtI.5'--'"'"'I'UMPPUMPINOPERASLEl2CNlf-P2CICONDENSATEROOSTERIPUMPINOPERABLEIWMPITHREESOXCAPACITT)PUMPSAREPROVlOED.IREDUCEDCONDENSATEIFllN-II)THREE514CAPACITTIPUMPSAREPROVIDED.ILOSSOF2OP2RUXNIXO))PUMPS.REACTORFEED-IPUMPSTRlPONMNISUCTIONPRESSURE.IREACTORSCRAM.122506(2)A-2

APPENDIXBCRITERIAFORELIMINATIONOFSYSTEMSANDCOMPONENTSOFSYSTEMSFROMTHECONTROLSYSTEMSFAILUREANALYSISCODEELIMINATIONCRITERIO&NlNon-electricalsystemsorcomponents,i.e.,solelymechanicalorsoftwaresystemsorcomponents.Examples:thereactorsystem,vessels,steamturbines.Note:Anyassociatedelectricalcontrolcomponentsmightberelevantandaretobereviewed.Examples:vesselliquidlevel,pressureandtemperaturecontrols,andturbinespeedcontrols.N2Non-controltypeelectricalsystemsorcomponents,i.e.,systemsorcomponentshavingnodirectorindirectcontrollingorcontrolledfunction,includingpermissiveinputandoutputsignals(strictlypassivesystemsandcomponents).Examples:theNuclearBoilerProcessInstrumentationsensors,transmitterlights,metersorrecorders,whichonlyprovidepureinformation,i.e.,measurementindications,andrecords.Note:Suchinformation,althoughpossiblyofinterestorimportancetoacceptablereactoroperationandoperatingpersonnel'smanualcontrolactionsisnotconsideredrelevanttoinitiatingorprohibitinganyautomaticelectricalcontrolactionsforthepurposeofthecontrolsystemcommonpowerfailureanalyses.N3Non-operationaltypeelectricalcontrolsystemsorcomponents,i.e.,systemsorcomponentsnotusedorrequiredtobeusableduringnormalreactorpoweroperations.Examples:theRefuelingInterlockControlSystem,thestartuprangeportionoftheNeutronMonitoringSystem,theturbinegeneratorturninggearcontrols.N4Operationalelectricalcontrolsystemsorcomponentswhichhavenodirectorindirectinteractionwithnormalreactoroperatingcontrolsystemsorcomponents.Examples:non-safetyrelatedheatingandairconditioningcontrolsystems,lightingcontrols.Operationalelectricalcontrolsystemsorcomponentswhichdodirectlyorindirectlyinteractwithreactoroperatingcontrolsystemsorcomponentsbutwhichcaninnowayeffectchangesinthereactorvesselliquid,pressure,orpowerlevels.Examples:theRadwasteControlSystem,sumppumplevelcontrols.*Insomecases,morethanonecriterionmayapply.12-2507B-1

APPENDIXBCRITERIAFORELIMINATIONOFSYSTEMSANDCOMPONENTSOFSYSTEMSFROMTHECONTROLSYSTEMSFAILUREANAIYSISCODEELIMINATIONCRITERIO&N6Operationalelectricalcontrolsystemsorcomponentsorportionsofsystemsorcomponentswhichperformdirectplantsafetycontrolfunc-tions.Examples:theReactorProtectionSystem,themainsteamlineradiationmonitoringportionoftheProcessRadiationMonitoringSystem,orthesteamleakdetectiontemperatureelementsandcontrolsoftheLeakDetectionSystem.Note:Anyrelatedresponseofthesesafetysystemsorcomponentstoconditionsoractionsbroughtaboutbynon-safetyrelatedcontrolsystemorcomponentactions,resultingdirectlyorindirectlyfromanon-safetypowersourcefailure,aretobeidentifiedandanalyzed.Example:areactorvessellowwaterlevelRPStripandasubsequentreactorscramresultingfromalossoffeedwaterflowwhichwas,inturn,directlyorindirectlycausedbyanon-safetypowersourcefailure,e.g.,afeedwaterpumpmotorpowerfailure.N7Electricalpowersystemsorcomponentsinvolvedtransformation,orinterruptionofelectricalpower.indistribution,However,controlsforthesesystems/componentsmightderedifthelossofsuchcontrolpowercouldleadothersystemsandcomponents.Example:the125Vdcacondensatepumpcircuitbreaker.needtobeconsi-tothefailureofcontrolpowerfor*Insomecases,morethanonecriterionmayapply.12-2507B"2

APPENDIXBAPPLICATIONOFELIMINATIONCRITERIATOPLANTSYSTEMSANDSUBSYSTEMSSYSTEMIDB13B22AB22BB22CB22HB35C12AC12BC22C33C41C51C51AC51BC51CC51DC72C88C91D13D24E12E21E22SYSTEMDESCRIPTIONReactorNuclearBoilerProcessInstrumentationJetPumpInstrumentationAutoDepressurizationNuclearSteamSupplyShutoffReactorRecirculationReactorManualControlControlRodDriveHydraulicRedundantReactivityControlFeedwaterControlStandbyLiquidControlNeutronMonitoringStartupRangeMonitoringPowerRangeMonitoringStartupRangeDetectorDriveTraversingIncoreProbe(TIP)CalibrationReactorProtectionRPSMGSetControlEngineeredTestandInformationPerformanceMonitoringProcessRadiationMonitoringSteamLineRadiationMonitoringPostAccidentSamplingResidualHeatRemovalIowPressureCoreSprayHighPressureCoreSprayELIMINATIONCODE+Nl,N2N3,N4N2N6N6NoneNoneNoneN6NoneN6N3NoneN3N4N6N6N2,N5N2,N5NoneN6N2,N5N6N6N6*SeeSheetsB-1andB-2forcodecriterionexplanation.12-2507B"3

APPENDIXBAPPLICATIONOFELIMINATIONCRITERIATOPLANTSYSTEMSANDSUBSYSTEMSSYSTEMIDSYSTEMDESCRIPTIONELIMINATIONCODEE31LeakDetectionSteamIeakDetectionN6N6E51FllF12F13F14F15F16F17F24F41G33G36H13H22LllL12AAS12-9ABD10-6ReactorCoreIsolationCoolingReactorFuelServiceEquipmentServicingAidsReactorVesselServiceEquipmentIn-VesselServiceEquipmentRefuelingEquipmentStorageEquipmentUnder-VesselServiceEquipmentGE/NEDEquipment(VesselComponents/TestEquipment)StartupEquipmentReactorWaterCleanupFilter/Demineralizer(RWCU)ControlRoomPanels/Portions)IocalInstrumentPanels(Portions)Fuel(Reactor)avAm'""CoreManagementServicesVFuelDesignServicesBreathingAirAuxiliaryBoilerBlowdownN6N3N2N2N2N3N2N3N3N3N5NSAllrelevantcomponentsareincludedinotheridentifiedsystemsNlNlNlN4N3,N4+SeeSheetsB-1andB-2forcodecriterionexplanation.12-2507B-4

APPENDIXBAPPLICATIONOFELIMINATIONCRITERIATOPLANTSYSTEMSANDSUBSYSTEMSSYSTEMIOABF10-2SYSTEMDESCRIPTIONAuxiliaryandBoilerFeedwaterandCondensateELIMINATIONCODE*N3,N4ABH13"11AuxiliaryBoilerChemicalFeedN3,N4ABM10-1AuxiliaryBoilerSteamN3,N4ARC5-1AnnunciatorInputCondenserAirRemovalN2NoneASR3-10AuxiliarySteam-RadwasteN3,N4ASS3-9AuxliarySteam-NuclearNoneBYSCCP9-1BatterySystemReactorPlantComponentCoolingWaterN7NoneCCS9-7TurbinePlantComponentCoolingWaterNoneCECCESCMS33-2CNA4-4.1CND~4-7CNM4-1.3ElectricalEquipment-ControlRoomElectricalEquipment.<<LocalContainmentAtmosphereMonitoring~~@AuxiliaryCondensateCondensateDemineralizerCondensateN7N2N5N5None*SeeSheetsB-1andB-2forcodecriterionexplanation.12-2507B-5

APPENDIXBAPPLICATIONOFELIMINATIONCRITERIATOPLANTSYSTEMSANDSUBSYSTEMSSYSTEMZDCNO4"10CNS4-3CPS22"23SYSTEMDESCRIPTIONCondensateBoosterPumpLubeOilSystemCondensateMakeup/DrawoffPrimaryContainmentPurgeELIMINATIONCODE"N5N3CRSColdReheat3-2NoneCMS2"1CirculatingVaterNoneDCS28-1DecontaminationSystemN3DER32-9ReactorBuildingEquipmentDrainsN4DET32-11DFD23-11TurbineBuildingEquipmentDrainsStandbyDieselGeneratorBuildingFloorDrainsN5DFE23-8DFM23-12DFR23-6IHCIHSISC27-19ServiceBuildingEquipmentDrainsMiscellaneousBuildingFloorDrains'""'.,ReactorBuildingFloorDrainsComputerI/OTSC/CR/EOF-ERFContainmentIsolationN5N5N4N2N2N6*SeeSheetsB-1andB-2forcodecriterionexplanation.12"2507B-6

APPENDIXBAPPLICATIONOFELIMINATIONCRITERIATOPLANTSYSTEMSANDSUBSYSTEMSSYSTEMZDLMS33-1SYSTEMDESCRIPTIONContainmentLeakageMonitoringELIMINATIONCODE+I,OS16-3LPMIWS31-1TurbineGeneratorOilConditioningandStorageVibrationandIoosePartsMonitoringRadioactiveLiquidwasteN2MSS3-1MaterialHandlingSystemMeteorologicalMonitoringSystemMainSteamN3NoneMWS9"15NJS24-10MakeupWaterNormalStationService-SubstationN5NNS24-8.424-8.6NormalStationService-4kVSupplyN7NPS24-8.2OFG31-4PBS23-3HDL4-2NormalStationService-13.8kVSupplyOffgas'~~~-':SanitaryDrainsvlRadiationMonitoringSystemRemoteShutdownSystemZ,owPressureFDWHeaterDrainNoneN4N6,N2N6None*SeeSheetsB-1andB-2forcodecriterionexplanation.12-2507B-7

APPENDIXBAPPLICATIONOFEIIMINATIONCRITERIATOPLANTSYSTEMSANDSUBSYSTEMSSYSTEMIDHRS3"3HVC22"9HVE22-2SYSTEMDESCRIPTIONHotReheatContxolBuildingA/CServiceBuildingA/CELIMINATIONCODE+NoneN4N4HVG22"17HVH22-16HVI22-29HVX22-12HVL22-11HVN22-14HVP22-7HVR22"1GlycolHeatingHotWaterHeatingAuxiliaryBoilerRoomVentilationControlBuildingChilledWaterAuxiliaryServiceBuildingVentilationVentilationChilledWaterDieselGeneratorBuildingVentilationReactorBuildingVentilationN4N4N4N4N4N4RadwasteBuildingVentilationHUT~~~TurbineBuildingVentilation22-3HVW22-5N4HVY22"8YardStructureVentilation*SeeSheetsB-1andB-2forcodecriterionexplanation.12"2507B-8

APPENDIXBAPPLICATIONOFELIMINATIONCRITERIATOPLAliTSYSTEMSANDSUBSYSTEMSSYSTEMID12"1IHAFPG15-5FPL15"3FPM15-7FPW15-1FWL7"3FWP6-4FWR6-3FWS6-1GMC16-eGMH16-7GML16-10GMO16-6GSN14-1SYSTEMDESCRIPTIONInstrumentAirAnnunciatorSystemFireProtection-HalonFireProtection-CO2FireDetectionFireProtection-WaterFDWPumpAuxiliaryLubeOilFDWPumpSealandLeakoffFDWPumpRecirculationFeedwaterSystemGeneratorStatorCoolingWaterGeneratorHsandCO@1I~~'e~;~,GeneratorLeadsCoolingGeneratorSealOilNitrogenSystemELIMINATIONCODE*NoneN4N4N2N4N3,N5N5NoneHoneNoneNoneNoneN5N4,N6*SeeSheetsB-1andB-2forcodecriterionexplanation.12-2507B9

APPENDIXBAPPLICATIONOFELIMINATIONCRITERIATOPLANTSYSTEMS..SDSUBSYSTEMSSYSTEMIDGTS27-15HCS27"13HDH6-6DFT23-7DFW23"10DRS22"22SYSTEMDESCRIPTIONStandbyGas'reatmentHydrogenRecombiaerHighPressureFDWHeaterDrainTurbineBuildingFloorDrainsRadvasteBuildingFloorDrainsDrywellCoolingELIMINATIONCODE+N6NoneN4,N5N4DSM32-7DSR32-6DTM32"5DWS23"1EGA12-4EGF8-9EGP,EGS24-9.EJS24-11.2MoistureSeparatorVentsandDrainsMoistureSeparatorReheaterVentsandDrainsTurbineBuildingMiscellaneousDrainsDomesticWaterStandbyDieselGenera>orAirStartup,~,StandbyDieselGeneratorFuel=StandbyDieselGeneratorProtectionStandbyStationServiceSubstationNoneNoneNoaeN4N4,N6N4,N6N7*SeeSheetsB-1andB-2forcodecriterioaexplanation.12-2507B"10

APPENDIXBAPPLICATIONOFELIMINATIONCRITERIATOPLANTSYSTEMSANDSUBSYSTBfSSYSTEMIDENS24-9ESS3-4SYSTEMDESCRIPTIONStandbyStationServiceSupplyBreakersEarthquakeRecordingSystemExtractionSteamELIMINATIONCODE*NjN2NoneFOF8-10FPF15"4MainGeneratorExcitationSystemDieselFirePumpFuelOilFireProtection-FoamN4N4SAS12"2SBPRSCCSCMSFC34-2SPF24-7.1SPG24"2.1SPM24-3SPR24-5ServiceAirSteamBypassandPressureRegulationOff"NormalStatusIndicatorPost-AccidentMonitoringFuelPoolCoolingandPurificationResStaXfmrHi-SideLineProtectionMainGeneratorProtection'3~~MainXfmrProtectionResStaXfmrProtectionNoneN2,N5N4,N6N7N7N7*SeeSheetsB-land'-2forcodecriterionexplanation.12-2507B-11

APPENDIXBAPPLICATIONOFEIIMINATIONCRITERIATOPLANTSYSTEMSANDSUBSYSTEMSSYSTEMIDSPS24-4SPU24-1SYSTEMDESCRIPTIONNormStaXfmrProtectionUnitProtectionELIMINATIONCODE%'7NjSPX24-6.1SRR23"2SRW23-4SSP21-8SSR21-2SST21-1SSW21"4SVH32-14SVV32-8SWP9"10SWR31-6SWT9-13SXSStationAuxPowerXfmrProtectionRoofDrainageStormandWasteWaterPost-AccidentSamplingReactorPlantSamplingTurbinePlantSamplingRadwasteBuildingSamplingFDWHeaterReliefVentsandDrainsMainSteamReliefValves-VentsandDrains"ServiceWaterSealWaterRadwasteTravelingScreenWashandDisposalTransientAnalysisN7N4N4N2,N5N2,N5N2,N5N2,N5N3,N5N6N6N5N4N3,N2+SeeSheetsB-1andB-2forcodecriterionexplanation.12"2507B-12

APPENDIXBAPPLICATIONOFELI!lINATIONCRITERIATOPLANTSYSTEMSANDSUBSYSTEMSSYSTEMIDSYD24-12.3SYG24"12.1SYS24"12.2TMA1-4TMB16-5.2THE16-1THG16-4THITML16-2TMR1-7TMS16-9VTP32-18WOS16-12WSS31-3SYSTEMDESCRIPTIONSynchronizing-StandbyStationServiceSynchronizing-MainGeneratorSynchronizing-NormalStationServiceTurbineTripsTurbineGeneratorE.H.FluidSystemTurbineGeneratorGlandSealandExhaustTurbineGeneratorTurningGearTurbineGeneratorSupervisoryInstrumentTurbineGeneratorLubeOilUnitRunbackTurbineGeneratorExhaustHoodSpray.~TurbinePlantEquipmentVentsWasteOilDisposalRadioactiveSolidWasteELIMINATIONCODE+N7N7N7NoneNoneNoneN3NoneN5NoneN3,N5N4N5*SeeSheetsB-1andB"2forcodecriterionexplanation.12-2507B-13

APPENDIXBAPPLICATIONOFELIMINATIONCRITERIATOPLANT'YSTEMSANDSUBSYSTEMSSYSTEMZDWTA13"20WTH13-4WTS13-1YUC24-7.2YXC24-7.3YXL24-3.2SYSTEMDESCRIPTIONChemicalFeed-AcidChemicalFeed-HypochloriteWaterTreating-RawWaterSWYDSupplytoResStationService345kVMotor-OperatorDiscSwitch345kVLineProtectionStationGrounding-InstrumentsandControlsELIMINATIONCODE*N7N7*SeeSheetsB-1andB-2forcodecriterionexplanation.12-2507

APPENDIXCCONTROLSYSTEMSCOMMONPOWERSOURCEFAILlJREANALYSESNINEMILEPONT2SHEETIOF70I2NPS-SWG001COMPONEHTIDCOMPONENTDESCRIPTION/FUNCTIOllPRIMARYEFFECTSSECONDARYEFFECTSCOMBINEDEFFECTSB35B35&001h,I~+I'*e2CHM-P2A2CNM-P2CREACTORILOSSOFPUMP.LOSSRECIRCULATIONPUMPIOFRECIRCULATIONILOOPhFLOW.ICONDENSATEBOOSTERILOSSOFPUMPSPUMPSIRECIRCULATIONRUNBACKILOSSOF2OUTOF2IRIJNNINCPUMPSWILLIRESULTINTOTALLOSSIOFCONDEHSATEFLOW,IREACTORFEEDPUMPSITRIP,ANDREACTORISCRAMIILOSSOFIOUTOF2IRUHNIHGPUMPSWIILRESULTIHSLIGHTIREDUCTIOHOFREACTORINLETfLOW,RECOVER-IIHGTONORMALWHENISTANDBYPUMPSTARTSIILOSSOF2OUTOF3IRUNNIHGPUMPSWILLIRESULTIHREDUCTIOHIOFREACTORIHLETFLOWIIWHICHWILLRECOVERIPARTIALLYWHENPUMPIP2CSTARTSFROM2HPS-SWG003.RECIRC-IULATIONRUNBACKANDITURBINERUNBACK'WILLIRESULTIIREFERTOSECTIONI4.0OFTHISREPORTIIFORCOMBINEDIEFFECTSASSOCIATEDIIWITHLOSSOFBUSI2HPS-SWG0012CWS-Plb2CWS-PIC2CWS-PIECIRCULATINCWATERIPUMPSLOSSOFPUMPS.IPARTIALLOSSOFMAINICONDENSERCOOLING.ILOSSOFMAIHCONDENSERVACUUMATIAPPROXIMATELY12INCHESHG/MIH.ITURBINETRIPINIAPPROXIllhTELY45ISECONDS,REACTORISCRAM.12-2463 I~t APPENDIXCCONTROLSYSTEMSCOMMONPOWERSOURCEFAILUREANALYSESNINEMILEPOINT2SHEET2OF70POMERSOURCECOMPONENTIDCOMPONEHTDESCRIPTION/FUNCTIONPRIMARYEFFECTSSECONDARYEFFECTSCOMBINEDEPFECTS(2HPS-SNG001(CONTINUED)(2NPS-SNGOOI2HNS-SQGOII2PQSPIAf4(REACTO2PHSPICA:;.'(PUMPSw*Ig'\RFEElNATER(LOSSOFPUMPS(LOSSOP1OUTOF2(RUNNINGPUMPSMILL(RESIJLTINRECIRCULA-ITIOHRUNBACK>AHD(TURBIHERUNBACK.(REACTORLEVEL(INCREASESMOMENTARILY((THENDECREASESANDIREACHESNORMALLEVEL.I(LOSSOF2OUTOF2(RUNNINGPUMPSHILLIRESULTINREACTOR(SCRAMATLOMLEVEL3B35B35-SoolhIRECIRClKATIONPUMPILOSSOFLFMGSET(ALFMGSETMOTORII2CCSPlh(TIJRBIHEBUILDING(LOSSOFPUMP(CLOSEDLOOP(ICOOLIHGHATERPUMPI(LOSSOFRECIRClKATION(PUMPB35-COOIALOWSPEED/FLOWCAPABILITYI(LOSSOF1OUTOP3('0'XCAPACITYPUMPS(HONEDURINGNORMAL(ONEROPERATIONIIINONE~STANDBYPUMPSTARTSAUTOMATICALLYIONLOJJDISCHARGE(HEADERPRESSUREIREFERTOSECTION(4.0OFTHISREPORT((FORCOMBINED(EFFECTASSOCIATEDIWITHLOSSOPBUSI2NNSSMGOll12-2463

APPENDIXCCONTROLSYSTEMSCOMMONPOWERSOURCEFAILUREANALYSESNIHEMILEPOINT2SHEET3OF70COMPONENTIDCOMPONENTDESCRIPTION/FUHCTIONPRIMARYEFFECTSSECONDARYEFFECTSCOMBINEDEPPECTS(2NPS-SMG0012NHS-SMG011(CONTINUED)2CHM-PIAI2CHMPICCONDENSATEPUMPSI2HDL-PlhIFOURTHPOINTIIHEATER2CHM-E4hIDRAINPUMPLOSSOFPUMPSLOSSOPPUMP)LOSSOF2OUTOF2(RUNNINGPUMPSMILLiRESULTIHTOTALLOSSIOFCOHDEHSATEFLOW.ICONDENSATEBOOSTERPUMPSTRIPoREACTORIFEEDPUMPSTRIPANDIREACTORSCRAM.LOSSIOF1OUTOF2RUHHIHGIIPUMPSMILLRESULTINIIREDUCEDIHLETFlANTOI(REACTORWHICHMILLRECOVERTONORMALIPSTANDBYCONDENSATEIPUMPSTARTS.LOSSOFII2OUTOF3RUNNINGIPUMPSWILLRESULTIHIREDUCTIONOFREACTORINLETFLOMWHICHMILLIRECOVERPARTIALLYIF2CNM-PICSTARTSFROMI2HHS-SMG013.RECIRC-IULATIOHRUNBACKANDITURBIHERUNBACKMILLiALSORESULT.IIFOURTHPOINTHEATER)2CHM-E4AMATERIRVEL(MILLIHCREASE.EMER-IGEHCYDRAIHVALVE2HDL-LV24hWILLOPENITODRAIHMATERTOiMAINCONDENSER.IPARTIALLOSSOFFEEDMATERlEATIHGIRESULTINGIHINCREASEIiOFCOREPOWERAND)MODULATIONOFCOREIFDN.REACTORINLET)FIANDECREASES(SLIGHTLYANDTHEH)RETURHSTONORMAL.INCREASEIHMAIHCONDEHSERMATERLEVEL.12-2463

APPFNDIXCCONTROLSYSTEHSCOHHONPOWERSOURCEFAILUREANALYSESHINENILEPOINT2SHEET4OF70IIPOWERSOURCEII2NPSSWG001SYSTEHCOHPONEHTIDCOHPONENTDESCRIPTION/FUNCTIONPRIHARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOMBINEDEFFECTSIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII2NNS-SMG012CCSCCP2CCS-.PICt2CCP-PIA2HDL-PICITURBINEBUILDINGICLOSEDLOOPCOOLINGWATERPUHPIIIRFACTORBUILDINGICLOSEDLOOPCOOLINGWATERPUHPIIFOURTHPOINTNEATER2CNH-E4CIDRAINPIMPII~IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIILOSSOFPUHPIIIIILOSSOFPUHPIIIILOSSOFPUHPIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIL..LOSSOFIOUTOF350$CAPACITYPUHPSIIILOSSOFIOUTOF3I50XCAPACITYPUHPSIIIIFOURTHPOINTHEATERI2CNHE4CWATERLEVELIWILIINCREASE.EHERGENCYDRAINVALVEI2NDL-LV24C'MILLOPEHTODRAINWATFRTOHAINCONDENSER.I'ARTlhl.I.OSSOfIFEEDWATERHEATINGRESULTINGININCREASEIOFCOREPOWFRANDNODULATIONOFCOREFLOM.REACTORINLETFllNDECREASESSLIGHTLY.INCREASEIINHAIHCONDFNSERLEVEL.IIIIIIIIIIIIIIIIIIIHONE,STANDBYPUHPISTARTSAUTOHATICALLYIONLOWDISCHARGEIHEADERPRESSUREIIHONK>STANDBYPUMPSTARTSAUTOHATICALLYIONLOWDISCHARGEHEADERPRESSUREIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIILOSSOFTHISBUSIWOULDDECREASEIFEEDWATERHEATIN0>IRESULTINGINLESSITHAN100FDROPINIFEED'MATERTEHPERATUREIIIIICII~IIl~Ilb;IIaIIICI,l~IIKIICIIIIIIIIIIIIIIII12-2463

APPENDIXCCONTROLSYSTEMSCOMMONPONKRSOURCEFAILUREANALYSESNINEMILEPOIHT2SHEET5OF70PNERSOURCESYSTEM)2NPS-SNG0012HNS-SNG014COMPONENTIDW~'-s~);ICOMPONENTDESCRIPTION/FUNCTIONPRIMARYEFFECTSSECONDARYEFFECTS2NPS-SNG0012NNS-SCOI42NS-US5C12CCP2CCPPIC2CCP-P3C(REACTORBUILDING)CLOSEDLOOP)COOLINGHATERPUMPIIIREACTORBUILDING(CLOSEDLOOPCOOLINGMATERfBOOSTERPUMP)LOSSOFPUMPIIIILOSSOFPUMPC12C001h)CRDFEEDPUMP)LOSSOFPUMPILOSSOFIOUTOF2100'APACITYPUMPSILOSSOF1OUTOF3I50$CAPACITYPUMPSfLOSSOF1OUTOF3)50XCAPACITYPUMPSI(NONE,STANDBYPUMPISTARTSAUTOMATICALLY)OHLOUDISCHARGEIPRESSURElINONESSTANDBYPUMP(STARTSAUTOMATICALLYIONIANDISCHARGEIHEADERPRESSUREIINONE~STANDBYPUMPISTARTSAUTOMATICALLYtOHLOMDISCHARGEIHEADERPRESSURE)LOSSOFTHISBUS)DOESNOTAFFECT)RPVPRESSUREIHATERLEVELSORPOMER2NPS-SNGOOI2NNS-SNGOli2HJS-US52NNS-MCCOII2IAS-Clb)INSTRUMENTAIRICOMPRESSORLOSSOFCOMPRESSORILOSSOF1OUTOF3100$CAPACITT)COMPRKSSORSINONE,STANDBYICOMPRESSORSTARTSIAUTOMATICALLYOHLOPIDISCHARGEHEADERIPRESSUREtLOSSOFTHISBUSIDOESHOTAFFECTIRPVPRESSURE,~HATERLEVEL,ORIBNKRCCP2CCP-P2AIREACTORBUILDINGILOSSOFPUMP)CLOSEDLOOP)COOLIHGMATER)INSTRUMENTAIR)COMPRESSORCOOLINGtIPUMPILOSSOF1OUTOF2100$CAPACITYPUMPSIHONE>STANDBYPUMP)IDSSOFTHISBUSISTARTSAUTOMATICALLY)DOESNOTAFFECTIONUNDISCHARGEIRPVPRESSUREsIHEADERPRESSUREIHATERLEVELSORIBSKR12-2463

APPENDIXCCONTROLSYSTEHSCOMMONPOWERSOURCEFAILUREANALYSESNINEMILEPOINT210-17-85SHEET6OF70POWERSOURCESYSTEMCOMPONENTCOMPONENTDESCRIPTION/IDFUNCTIONPRIMARYEFFECTSSECONDARYEFFECTSCOMBINEDEFFECTS(2NPS-SWG0012NJS-US2A2NHS-MCC014h2NPS-SWG0012HJS-US3A2NHS-MCC006hB35.teqg.a35-D003hIB35-P3hIIIIB35-D003BIB35-P4BIIIHYDRAULICOILPUMP(LOSSOFHYDRAULICSUBLOOP1TO(PUMPANDPRESSURERECIRClKATIONFLOWISUBLOOPIhCONTROLVALVE"h"IHYDRAULICOILPUMP(LOSSOFHYDRAULICSUBLOOP)TOIPUMPANDPRESSURERECIRCULATIONFLOW(SUBLOOP1BCONTROLVALVE"B"INONE>>RECIRCVALVEFORIFAILSASISAND(SUBLOOP2AAVAILABLEI(IHREADYHODR)IINONEsRECIRCVALVEFORIFAILSASISANDSUBLOOP2BAVAILABLE(INREADYMODE)(LOSSOFTHISBUSIDOESNOTAFFECTIRPVPRESSURE,IWATERLEVEL>OR(POWER2NPSSWGOOI2NJS-US3h2NJS-US3C2NJS-PNL3002IHS-PNL0032GML-FNIAIGENERATORLEADSILOSSOFFANICOOLINGFANILOSSOFIOUTOF2I100KFANS(NONE,STANDBYFANILOSSOFTHISBUSISTARTSAUTOMATICAILYIDOESNOTAFFECTIONLOSSOFRUNNINGIRPVPRESSURE>IFANIWATERLEVEL,ORPOWERARC2ARC-SOV11ICONDENSERDRAIN(ITANK2ARC"TK1(DRAINVALVEVALVEFAILSCLOSED(LOSSOFTANKDRAINTOI(HAINCONDENSER.IPOSSIBLEHIGHWATERILEVELIHTANK.ILOSSOFTHISBUSIDOESNOTAFFECTIRPVPRESSURE,IIWATERLEVEL>>ORIPOWER.12-2463

I'III'I'~'ttI'IIIIsll'IItlI'IIIIIIIIIIIIIII'IIIIIIIIIIII'IIIIrIIII'I'I'IIII'II'II:'I'III'I'IIIII'I'IIIII'I'l'I'IA'IIIII'I'IIIIIII'I'lIIIItII'III'IIII'IIII'II'

APPENDIXCCONTROLSYSTEMSCOMMONPOWERSOURCEFAILUREANALYSESNINEMILEPOINT2SHEET8Oi70POWERSOURCE(2NPS-SWG0012HJS-UShh2SCI-PHL1002SCI-PNLAIOICOMPONENTIDCOMPONENTDESCRIPTION/FUNCTIONPRIMARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOMBINEDEFFECTSMSS(CKT2MSSA09III2FWR-FV2A2FWR-FV2CIIHDLI2HDLFV35AII2HDL-FV35CIIIIESSICRT2KSSA05I(2ESSC05IEXTRACTIONSTEAMSYSTEMAUXILIARYCIRCUITSSTEANLINEDRAINVALVES2MSS-AOV85AAND2MSS-AOV85CREACTORFEEDPUMPS2FWS-PIAAND2FWS-PICRECIRCU-LATIONVALVESILOSSOiISOLATIONISIGNALSFOR(2KSS-MOV3A,MOV3C,(N)VISA,MOV15C,IN)V22hsMOV22CoN)V28A~MOV28CONITURBINEMASTERTRIPIIIl)SSOFISOLATION(SIGNALFORTHIRD/SIXTHPOIHTHEATERIA/CEXTRACTIOHVALVE(WHENRESPECTIVE(HEATERWATERLEVELISIHIGHI(VALVESFAILOPEHIII(VALVESFAILOPENFOURTHPOINT(VALVESFAILOPENHEATERDRAINPUMP2HDL-PlhAND2HDL-PlCRECIRCU-LATIONVALVES(NONE,ASSOCIATEDINOHRETURHVALVEICLOSESAUTOMATICALLY(ONHIGHLEVELIHIHEATERIIIIINCREASEDSTEAMHAN(TOMAINCONDENSER.II(REAClORINLETFLOW(REDUCED.RECIRCULA-(TIONRUNBACKAND(TURBINERUNBACK.(INCREASEIHMAIN(CONDEHSKRWATERILEVEL.IIHEATERDRAINPUMP(FLOWTOCONDENSATE/IFEEDWATERREDUCED.REACTORINLETFLOW(DECREASESANDTHEHRETURHSTONOR)IAL.(REDUCEDFEKOWATKRITEMPERATURERESULTINGI(IHINCREASEINCORE(POWERANDMODULATION(OFCOREFLOW.I12-2463

APPENDIXCCONTROLSYSTEMSCOMMONPOWERSOURCEFAILUREANALYSESHINEMILEPOINT2SHEET9OFTOPOWERSOURCESYSTEMCOMPONENTIDCOMPONENTDESCRIPTION/FUNCTIONPRIMARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOMBINEDKFH?CTS)2NPS-SWGOOI2NJS-US4A2SCI-PNLIOO2SCI-PNLA101I(CONTINUED)IjI~IIIHDL-'+m]lICKT2HDLA03I2HDLC03TMK)2TMK-LV13AI2TME-HV2lhIHDLAUXILIARYCIRCUITSCLEANSTEAMREBOILER2TMK-EIAMAKEUPVALVEANDCONDENSATEIHLETVALVEILOSSOFFOURTHPOINT)HEATERDRAINPUMPSI2llDL-PlhAND2HDL-PlCITRIPWl?KHFIRST/ISlCONDPOIHTHEATER)'WATERLEVELISHIGH.ILi>SSOFSIXTHPOINT)l0:ATERNORMALLEVELICUNTROLVALVE)2MDH-LV6h/2NDH-LV6C)AUTOCLOSESIGNAL)Wl?KNASSOCIATEDIIDLERWATERLEVELISIHIGH.IIVALVESFAlLCLOSED.ILOSSOF2TME-NV21AIPOSITIONINDICATIONIIHCONTROLROOM.IPARTIALFEEDWATERIHEATIHGLOSS.ILOSSOFCONDENSATEIREBOILER2TME-ElhINONES'IHGLEREBOILER)I2TMK-KIBISAVAILABLEI)WIIMIIu)2NPS-SWGOOI.2HJS-US4A2SCI-PHL1002SCI-PNLA1022CNM-FV3BBICONDENSATKBOOSTERIIPUMP2CNM-P2BIRECIRCULATIONIVALVEVALVEFAILSOPEN)CONDENSATK/FEEDWATKRFLOWREDUCED.IRECIRCULATIONRUNBACKIANDTURBIHERUNBACK.IINCREASEINMAINCON-)DENSERWATERLEVEL.)LOSSOFTHISBUS)WOULDCAUSEA)RECIRCULATION)RUNBACKWITHITURBINERUNBACKESSCKT2KSSB05IEXTRACTIOHSTEAM)SYSTEMAUXILIARYICIRCUITILOSSOFISOLATIONISIGNALSFORI2ESS-MOV3BoMOVISBoMOV22B,MOV28BONITURBINEMASTERTRIPIILOSSOFISOLATIOHISIGNALSFORTHIRD/)SIXTHPOINTHEATERI"B"EXTRACTIONVALVESIWHENRESPECTIVE)HEATERMATERLEVELISIHIGH)NONE,IFASSOCIATED)NON-RETURHVALVE)CLOSESAUTOMATICALLYIONHIGHLEVELIN)HEATERIIi12-2463

APPENDIXCCONTROLSYSTEMSCOMMONPOMERSOURCEFAILUREANALYSESHINEt!ILEPOIHT2SHEET10OF10PONERSOURCESYSTEJlCOMPONENTIDCOMPONENTDESCRIPTION/FUNCTIONPRIMARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOMBINEDEFFECTS(2NPS-SNG0012HJS-US4A2SCI-PNL1002SCI-PNLA102(CONTINUED)2FNR-FV2B(REACTORFEEINATER(IPUMP285-PIB(RECIRCULATION(VALVEHDL(2HDL-FV35B(FOURTHPOIHT(HEATERDRAIHPUMP(2HDL-P1BRECIRCU-(LATIONVALVEVALVEFAILSOPENVALVEFAILSOPEN(REACTORINLETFlAN(REDUCED.RECIRCULA-(TIONRUNBACKAND(TURBIHERUNBACK.IINCREASEIHMAINCON-(DENSERMATERLEVEL.lIHEATERDRAINPUMPIFLOWTOCONDEHSATE/.(FEEDVATERREDUCED.(REACTORIHLETFLON(DECRFASESTHEN(RETURNSTONORMAL,IREDUCEDFEEDMATER(TEMPERATURERESULTING((IHINCREASEOFCOREIPOVERANDMODULATIONIOFCOREFLON.MSSICKT2MSSN21IIIIITMEI2TME-LV13BII2TME-HV2IBIIIITURBINECVSTEAMLEADDRAINVALVES2MSS-AOVIOBAND2MSSAOV10DCLEANSTEAMREBOILER2TME-EIBHAKEUPVALVEANDCONDENSATEIHLETVALVE(CKT2HDLB07(HDLAUXILIARY(CIRCUIT(LOSSOFFOURTHPOINT(HEATERDRAINPUMPI2HDLPIBTRIPlOJEHIFIRST/SECONDPOINT(HEATERMATERLEVELIS(HIGH.LOSSOFSIXTH(POINTHEATERNORMALILEVELCONTROLVALVE2HDH-LV6BAUTOCLOSEISIGHALMEHHEATERIHATERLEVELISHIGH.I(VALVESPhILOPEN.(VALVESFAILCLOSED.(LOSSOF2TME-HV21B(POSITIONINDICATIONIIHCONTROLROOM~I(INCREASEDSTEAMFUN(TOMAIHCONDEHSER.ILOSSOFCOHDENSATETOINONEeSINCEREBOILERIREBOILER2TMEE1BI2TME-ElhISAVAILABLEP12-2463

APPENDIXCCONTROLSYSTEMSCOMMONPOMERSOURCEFAILUREANALYSESNINEMILEPOIHT2SHEET11OF70POMERSOURCEI2NPS-SMC0012NJS-US4h2SCI-PNL1002SCI-PHIA103COMPONENTIDCOtfPONENTDESCRIPTION/FIJNCTIOHPRIMARYEFFECTSSECONDARYEFFECTSCOMBINEDEFFECTSDSM(2DSM-LVX75A(2DSII-LVY75hI2DSM-LVZ75AI2DSM-LV78AIMOISTURESEPARATOR(DRAINRECEIVER(TANK,2DSM-TK4h(NORMALANDEMER-IGEHCYDRAIN(CONTROLVALVESDSR(2DSRLVX65A(2DSR-LVY65AI2DSR-LVZ65A(2DSR-LV68A(MOISTURESEPARATOR(REHEATERDRAIH(RECEIVERTANK(2DSR-TK6ANORMALIANDEMERGENCY(DRAIHCONTROL(VALVESHDH2HDH-LV6A2HDH-LV6C(2HDH-LV26A(2HDH-LV26C(SIXTHPOINTHEATERI2FMS-E6AAND(2FMS-E6CNORMALIANDEMERGEHCY(DRAINCOHTROL(VALVESASSI2ASS-SOV142IMAINSTEAMTO(OFFGASSYSTEM(ISOLATIOHVALVEVALVEFAILSCLOSED(2DSM-IVX75h,I2DSM-LVY75A)(2DSM-LVZ75AFAIL(CISSED.2DSM-LV78A(FAILSOPEN.LOSSOFIVALVEPOSITIOHINDICATIONIHCOHTROLIROOMI2DSR-LVX65A,(2DSR-LVY65A,I2DSR-LVZ65APAIL(CLOSED.2DSR-LV68h(FAILSOPEN.ITSOF(VALVEPOSITION(IHDICATIONINCONTROL(ROOM,(2HDH-LV6AANDI2HDH-LV6CFAILICLOSED.2HDH-LV26hIAND2HDH-LV26CFAIL(OPEN.ITOTALIWOFSTEAM(TOOFFCASSYSTEM..IEFFICIENCYOFOFFCASISYSTEMCATALYTICICONVERTERISREDUCED.(PARTIALLOSSOFFEED-MATERHEATIHGAT(FOURTHPOINTHEATERS2CNME4h)2CHME4B~(AHD2CNM-E4C.IINCREASEIHREACTORCOREPOMERANDMODULATIONOFCOREIFLOM.INCREASED(STEAMFLOMTOMAINCONDENSER.IIPARTIALLOSSOF(FEEDMATERHEATIHGATISIXTHPOINTHEATERS(2FMS-E6A)2FMS-E6B)(AND2FMS-E6C.IHCREASEIHREACTOR(COREPOMERAND(HODULATIOHOFCORE(rraM.INCREASED(STEAMFLOMTOMAIN(CONDENSER.IIPARTIALLOSSOiFEED-IMATERHEATINGAT(FirmPOINTHEATERS2CHM-E5AAND(2CHM-ESC.INCREASEIHREACTORCOREPOMER(ANDMODULATIONOFICOREFLOM.IHCREASEDISTEAMFlANTOMAIHCONDENSER.IIOFFCASSYSTEMISO-(LATESONHIGHRADIA-(TIOHORSHU116MNOi(TRAINIA/IBOHHICHIHYDROGENCOHCEHTRATION.II(LOSEOFPCASSYSTEM,IRESULTIHGINhIDECREASEINMAIN(CONDENSERVACUUM.(TURBINETRIP.IREACTORSCRAM.(LOSSOFTHISBUSIMOULDDECREASEIFEEDMATERHEATING)I(RESULTIHGIHAN(IIHSIGHIFICAHTDROPIIHFEED'MATER(TEMPERATURE.

APPENDIXCCONTROLSYSTEMSCOMMONPOWERSOURCEFAILUREANALYSESNINEMILEPOINT2SHEET12OF70lPOWERSOURCE)COMPONEIITIDi+d-.COMPONENTDESCRIPTION/at"FUNCTIONPRIMARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOMBINEDEFFECTS2NPS-SWG0012HJS-US4A2SCI-PNL1002SCI-PNLA103((CO)mHUEO)HDL2HDL-LVSAI2HDL-LVSCII2HDL-LV24AI(2HDL-LV24C(2HDL-IV25h((2HDL-LV25C(IIII2HDL-LV22AI(2HDL-LV22CI2HDL-LV23hI(2HDL-LV23C(IIIFIFTHPOINTHEATERS2CNM-E5hAND2CHM-E5CNORMALLEVELDRAINCONTROLVALVES.FOURTHPOIHTHEATERS2CNM-E4AAND2CNM-E4CsANDFIFTHPOIHTHEATERS2CNM-E5hAND2CHM-E5CHIGHLEVELDRAINCONTROLVALVES.SECONDPOINTANDTHIRDPOINTHEATERS2CHM-E2A,E2CAND2CNM-E3A,E3CHIGHLEVELDRAINCONTROLVALVES(2HDL"LVSAANDI2)0)L-LVSCFAILIC)l)SED.2HDL"LV24h,I2)3)L-LV24Cs(2)'))L-LV25A,ANDI2)'DL-LV25CFAILOPEN.VALVESFAILOPEN(FOURTHPOIHTHEATERIDRAINPUMPS2HDL-Plh(AND2HDL-PICTRIPON(LOWSUCTIONPRESSURE.LOSSOFFLOWTO(CONDENSATE/FEEDWATERISYSTEM.REDUCEDFEEDWATERTEMPERATURE(DUETOLOSSOFPUMP(FLOWANDPARTIALLOSS((OF)RATINGATFOURTHIPOINTHEATERS2CNM-E4AANDI2CNM-E4C.INCREASEIHCOREPOWERANDMODULATIONOFCOREIFLO'W.REACTORINLETIFLOWDECREASESANDITHENRETURNSTO(NORMAL.IHCREASED(STEAMFLOWTOMAIN(CONDENSER.ILOSSOFCONDEHSATE/(FEEDWATERHEATINGATDRAINCOOLERS(2CNM-DCL2A,I2CNMDCL2Co(2CNM-DCL3h,ANDI2CNMDCL3CFEED-WATERTEMPERATUREREDUCED.IHCREASEINCOREPOlKRAHD(MODULATIONOFCORE(FLOW.IHCREASEDSTEAM(IFLOWTOMAIN(CONDENSER.iIVlfU-

I'I)I'I'IIIIIIII'IIIIIIIIItIII'IIII'II'IIIIIIII'II'IIIlIII'II:IIIIII'III'III'I'IIII'IIII'I'II'III'I'llIIlaIIIIII'II'IIII'I'lOII

APPENDIXCCONTROLSYSTEMSCOMMOHBNERSOURCEFAILUREANALYSESHIHEMILEPOINT2SHE+14OF70lPOVERSOURCECOMPONENTIDCOMPOHEHTDESCRIPTION/FUNCTIOHPRIMARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOMBINEDEFFECTS)2NPS-SNG001ZNJS-US4A2SCI-PHL1002SCI-PNLB101(CONTINUED)CNM2CNM-FVIII~~ICONDENSATEPUMPSgj',"~I'RECIRCULATIOH)VALVEDSRI2DSR-AOVSlBISCAVENGINGSTEAMI2DSR-AOV82BIFEEDHATERHEATERZDSR-AOV83B)285-E6BINLETI2DSR-AOV84BIVALVEANDISOLA-ITIONVALVESIVALVEFAILSOPENIIIIVALVESFAILCLOSED.)ASSOFVALVEPOSI-ITIONINDICATIONIHICCHTROLROM.ICONDENSATEFLOMIREDUCED.RECIRCULAITIOHRUNBACK.ITURBINERUNBACK.IHCREASEIHMAIHCON-IDENSERHATERLEVEL.lSAFETYVALVE2DSR-SVS5BOPENSTOIDUMPSTEAMTOMAINCONDENSER.LOSSOFSCAVEHGIHGSTEAMTOISIXTllPOIHTFEEDVATERIIHEATERSZFVS-E6h,IZR6-E6B,AND)ZFWS-E6CFROMIMOISTURESEPARATORIREHEATERZMSS-EIB.FEED'MATERHEATIHGIREDUCED.IHCREASEIN}ICOREONERAHDIMODULATIONOFCOREtFLOH.12-2463 N

APPENDIXCCONTROLSYSTEMSCOMMOHPOWERSOURCEFAILUREANALYSESNINEMILEPOINT2SHEET15Oi70COMPONENTIDCOMPONENTDESCRIPTION/FUNCTIONPRIMARYEFFECTSSECONDARYEFfECTSCOMBINEDEFFECTS)2NPS-SVG0012NJSUS4h2SCI-PNL1002SCI-PHLB101(CONTINUED)DIllI2DTM-AOV104iI2DIM-AOVI05."',I2DTM-AOV102I2DIM-AOV107I2DTMAOV1082DIM-AOV156III2DIM-AOV1062DTM-AOV119I2DTM-AOV157IIGMNf2GMN-SOVIIbI2GMH-AOV119IASICXG21ASNOI.,FIFTH/SIXTHPOINTIVALVESFAlLOPEN.HEATERHEADERILOSSOFVALVEPOSI-"DRAINVALVESITIONIHDICATIOHIHICONTROLROOM.ITURBINEGENERATORGLANDSEALANDIEXHAUSTSTEAMIDRAINVALVEI.)AUXSTEAMDRAINiVALVESI'IIEXTRACTIONHEADERIDRAIHVALVESIIIIHYDROGENISOLATIONIVALVESIVAlVEFAILSOPEN.ILO'SOiVALVEPOSI-ITIONINDICATIOHIHICONTROLROOM.IIVALVESFAILOPEH.ILOSSOFPOSITIOHIH-IDICATIONSINCOHTROLIROOM.IIVALVEFAlLOPEN.LOSSOFPOSITIOHIH-IDICATIONSIHCONTROLiROOM.IIVALVESPAILCLOSED.(LOSSOiVALVEPOSI-)TIOHIHDICATIONIHCONTROLROM.IILOSSOiCOMPRESSORI21AS-CIA,GIBECICIAUTOSTARTONQNIHEADERPRESSUREIINSTRUMENTAIRISYSTEMAUXILIARYICIRCUIT)PARTIALLOSSOFIFEEINATERHEATINGAT2CNM-E5A,2CNM-ESB)I2CNM-ESC,285-E6A)I2FMSE6BiAND2FWS-E6C.INCREASEIIHREACTORCOREONERtANDMODULATIONOFCOREFLO'M.INCREASEDISTEAMFIANTOMAIHICONDENSERIIINCREASEDHANTOIMAINCONDENSER.i-INCREASEDFIATTOIHAINCONDENSER.IEXTRACTIOHSTEAMDUMPSTOMAINICONDEHSER.IIILOSSOiHYDROGEN)SUPPLYFORGENERATOR)COOLING.PROBABLE)TURBINETRIP.II12-2463

APPENDIXCCONTROLSYSTEMSCOMMONPNtKRSOURCEFAILUREANALYSESNIHEMILEPOINT2SHEET16OF102NPS-SMG0012NJS-US4A2SCI-PNL10028CI"PNLB101(CONTINUED)COMPONENTIDCOMPONENTDESCRIPTION/FUNCTIONPRIMARYEFFECTSI2IAS-SOV171FAILSCLOSEDTOISOLATE(HEATERS.IjSECONDARYEFFECTS(LOSSOFMAKEUPAIRTO(OFFGASSYSTKttPRE-IHEATERS~LOSSOFMAKE-IIUPAIRTOOFFGASSYSI(TEMVACUUMPUMPS.PUMPSMAYTRIPOHLOMISUCTIONPRESSURERESULTINGINLOSSOF(OFFGASSYSTEM.THIS(MILLLEADTOLOSSOFIMAIHCONDENSERVACUUMI(ANDTURBINETRIP.OTHEREFFECTSCOMBINEDEFFECTSI2NPS-SNG0012NJS-USAA2SCI-PNL1002SCI-PNLBIOIMSS(2MSS-AOV191IMAINSTEAMDRAINI2MSS-AOV194IVALVESI2MSSAOV203II2MSS-AOV205II2HSS-AOV209II2MSS-AOV88AII2MSS-AOV88BI-ICET2MSSN02IDRAINVALVEIAUXILIARYCIRCUITI2MSS-AOV92AIMOISTURESEPARATOR(2MSS-AOV92BIRENKATER2MSS-ElhIAND2MSS-EIBMAINISTEAMSUPPLYIVALVESIVALVESFAILOPEN.LOSSOFVALVEPOSI-ITIOHINDICATIONINICONTROLROOM.IDRAINVALVESI2MSS-MOV2lh,I2MSS-MOV21BII2MSS-MOV21C,AHDI2MSS-MOV21AOPEN.ILOSSOFVALVEPOSI<<ITIOHINDICATIOHINICOHTROLROOM.IIVALVESFAILCLOSED.ILOSSOFVALVEPOSI-ITIOHINDICATIONINICONTROLROOM.INCREASEDSTEAMFLOllITOMAIHCONDKHSER.IINCREASEDSTEAMFLNtITOMAINCONDENSER.LOSSOFMOISTURESEPARATOR2MSS-Elb(AND2MSS-ElB.IANPRESSURETURBINEEFFICIENCYREDUCED.IIV.I.IIIIMIICII~II(64Ilu;12"2463

APPENDIXCCOHTROLSYSTEtlSCMMONPOWERSOURCEFAILUREANALYSESNINEMIIEPOINT210-31-85SHEET17OF70lZHPs-sw00012NJS-US4A2SCI-P?tL1002SCI-PNLB?OI(CONTIN?ED)IIf2HPS-SWGOOI2HJS-US4A2SCI-PNL1002SCI-PBLB1032Ttmh%121"lIDSM(2DQl-LVX75B(l2DQt-LVY75B(2DSM-LVZ75$l(2DQt-LV78B(DSR(2DSR-LVX65Bl(2DSR-IVY65B(I2DSRLVZ65BIlZDSR-LV68B2HDH-LV6BZHDR-LV26BIPOVERSOURCESYSTEttDESCRIPTION/FUNCTIONGLANDSEALSTEAMAUXILIARYSUPPLYISOLATIONVALVE?R)ISTURESEPARATORDRAINRECEIVERTANK2DQi-TK4BNORMALAHDEMERGENCYDRAINCONTROLVALVESMOISTURESEPARATORREHEATERDRAINRECEIVERTANK2DSR-TK68NORMALANDEMERGENCYDRAIHCONTROLVALVESSIXTHPOINTHEATER2FWS-E6BNORMALAND-EMERGENCYDRAIHCONTROLVALVES.PRItthRYEFFECTS(VALVEFAILSCLOSED.ILOSSOFVALVEPOSI-(TIONINDICATIONINICONTROLROMII1(2DSM-LVX75B,(2DSM-LVY758,AND(ZDQt-LVZ758rhrr.lCIlsED.2DSM-LV78B(FAlLSOPEN.lLOSSOFVALVElPOSITIONINDICATIONIINCONTROLROOM.II((2DSR-LVX65B,-LVY65B,(AND-LVZ65BFAILlclesED.2DsR-Lv68AlFAILSOPEN.ASSOF(VALVEPOSITIONIHDI-(CATIOHIHCONTROL(ROOM.lI(I2HDH-LV68FAILSICLOSED.ZHDBLV26B(FAILSOPEN.I.I'ISECONDARYEFFECTSI(LossorMAINSTEAMAs(BACKUPFORTllRBIHEIGLANDSEAL.NOIEFFECTIFCIJ?AHSTRA?t(REBOILEESTRA?fIS(AVAILABLE.I(PARTIALLOSSOFFEED-(WA1KRHEATINGAT(FOURTHPOINTHEhTERSI2CNHE4Ay2CNME4Bpl(AND2C?tM-E4C.IINCREASEIHREACTORCOREPOWERANDMODU-lLATIOHOFCOREFLNt.(INCREASEDSTEAMFLOtt(TOtthINCONDP2iSERIl(PARTIALLossorFEED-llVATERHEATIHGAT(SlXTHPOINTHEATERSl2FHS-E6h,285-E6B,(AHD2rws-E6C.INCREASEIllREACTORICOREPOWERANDMODU-LATIONOFCOREFLNt.INCREASEDSTEAMFllSlTOHAINCONDENSER.IlPARTIALLossorHKD-IWATERHEATINGATFIFTHPOINTHEATERl2CNM-ESB.INCREASE((INREACTORCOREPOtER(lANDNODULATIONOF(lCOREneo.INCREASED(lFMwToMAINsTKAMICONDENSER.IlINFRETTER(TE?IPE??ATI?RE.IIllI~(,I(I(IIlIIIIIlIItllCOMBINEDEFFECTSlIlI.II(l(LossorTBIsBUS(ltOULDDECREASEFEEDHATKRBEATING,1(RESULTIHCIHAH((It(SIGNIFICANTIH?OPg3

APPENDIXCCOHmOLSYSTEHSCoeeNPOMERSOURCEFAIIUREANALYSESNINENILEPOINT2SHEET18OFYOPOMERSOURCESYSTKHCOHPONENTIDCOMPONENTDESCRIPTION/FtJHCTIOHPRIHARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOHBINEDEFFECTS(2NPSSMGOOI2NJS-US4h2SCI-PNLIOO2SCI-PNLBIOI((CONTINUED)2HDLLVSB~t("FIFTHPOINTHEATER(2HDL-LV24B".(.'2CNH-E5BNORHALI2HDL"LV25BIANDHIGHLEVEL(DRAIHCONTROL(VALVES.FOURTH(POINTHEATER(2CNH-E4BHIGH(LEVELDRAIN(CONTROLVALVE.I2HDLLV5BFAILSICLOSED.2HDL-LV24B(AND2HDL-LV25BFAILIOPEN.(2HDL-LV22BI2HDL-LV23BIIIIISECONDAHDTHIRDPOINTHEATERS2CNH-E2BAND2CHH-E3BHIGHLEVELDRAINCONTROLVALVESVALVESFAlLOPENOFGI20FG-AT16AII20FG-A116BIHYDROGENANALYZERILOSSOFHIGHHYDROGENATIA/IBOUTLETTO(CONCEHTRATIOHSHUT"OFFGASCOHDEHSER(DOMNOFTRAINlh/IB(CAPABILITY.(FOURTHPOINTHEATER(DRAINPUHP2HDL-PIBITRIPONLOMSUCTIOHIPRESSURELOSSOF(FLOMTOCONDENSATE/FEEDMATERSYSTEH.REACTORINLETFLOMDECREASESANDTIKN(RETURNSTONORMAL.REDUCEDFEEDMATER(TEHPERATUREDUETOREDUCEDFEEDMATER(TEHPERATUREDUETO(LOSSOFPUHPFLOMANDIIPARTIALLOSSOFFEED"(MATERHEATIHGAT(FOURTHPOINTHEATERI2CNN-E4B.IHCREASEIINCOREPOWERANDIHODULATIOHOFCORE(FLOM.INCREASEDSTEAN((FLOMTOHAIH.I(LOSSOFFEEDMATER(HEATIHGATDRAIHCOOLERS2CHH-DCL2B(AND2CNH-DCLSB.(FEEDMATERTEHPERATURE((REDUCED.IHCREASEIN((COREPOMERAHDNODU-LATIONOFCOREFLOM.INCREASEDSTEAHFUN(TOlihIHCOHDEHSER.II12-2463

APPENDIXCCONTROLSYSTEHSCONHONPOMERSOURCEFAILUREANALYSESNINEIIILEPOINT2SHEET19OFj0POWERSOURCE2NPS-SWG0012NJS-US4A2HJS-US4C2HJS-PNL4002SCA-PNL4002HPS-SMG0012NJS-US4A2NJS-US4C2HJS-PNL4002SCA-PHL40112-2463SYSTENCOMPONENTIDK144ACIRCUITK144BCIRCUITIIIIIB35IIIIIIIIIIIIIB35IIIIIIIIIIIIIIIIIIIIIIIIIIIIL~COHPOHFNTDESCRIPTIOH/FUNCTIONLFHGSET"A"VOLTAGEREGULATORIIIIIIIIIIILFNGSET"8"VOLTAGEREGULATORPRIHARYEFFECTSLFHGSET"A"DIS-ABLED.LOSSOFRECIRCULATIOH"A"FLOMCAPABILITY.IIINONEAT(POMERLOWIIIIIIIIII(NONF.ATIPOWERLOW(I(LFNGSET"B"DIS-ABI.ED.LOSSOF(RECIRCULATION"B"(FLO'MCAPABILITY.IIIIIIIIII(IIIIII(IIIIIIII100'XREACTORIDOLREACTORIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII(.OTHEREFFECTSCONBINEDEFFECTSIIIIIIIIIIIIIIIII(C3Il~IIV.(I(v.I(IICIl~III~I(C"

'I1'\

APPENDIXCCONTROLSYSTEHSCOHHOHPOMERSOURCEFAILUREANALYSESNINENILEPOINT2SHEET20OF10POMERSOURCESYSTEHCOHPONENTIDCOHPONEHTDESCRIPTION/FUNCTIONPRIHARYEFFECTSSECONDARYEFFECTS(2NPS-SMGOOI(2NJS-US4AI2NJS-US4CI2HJS-PHL400(2SCA-PNL403CCSCKT2CCSN01>q(~,TURBINEBLDGCLOSED(HAXEUP'MATERVALVE'Ny-~F.'(.-,LOOPCOOLINGMATER(2CCS-AOV105FAILS~kl"SYSTEHAUXILIARY(OPEN.ALLTHREEICIRCUIT.ITURBINEBUILDIHGICL)SEDLOOPCOOLINGIMATERPUHPSTRIP.IMAKEUPTANK2CCS-TKI(LEVELMILLIHCREASE.(EXCESS'MATERMILLFLOMIITODRAIHSYSTEHLOSS((OFTURBINEBUILDIHGICLOSEDLOOPCOOLIHGI('MATERSYSTEHRESULTIHG(IIHLOSSOFCOOLIHGTO:((I1.CONDENSATEANDCON-(DFHSATEBOOSTERPUHPLUBEOIL(COOLERS.(2.EXCITERALTERNATOR(COOLERS.I3.HYDROGENCOOLERS.I4.GENERATORSTATOR(MATERCOOLERS.(5.GEHERATORLEADCOOLERS.(6.ENCFLUIDUHITCOOLERS.I1~REACTORFEEDPUHPLUBEOILAHDHOTOR(ICOOLERS~(8.TURBINELUBEOILCOOLERS.(9~OFFGASCONDENSERSIIANDREFRIGERATIONIUNITCOOLERS.IO.CIRCULATIHGMATERPUHPHOTOROILICOOLERS'11HEATERDRAINPUMPCOOLERS.IDELAYEDTURBINE(TRIPDUETOLOSS(OFHAINCONDENSER(VACUlBI.12-2463

APPENDIXCCONTROI.SYSTEtfSCOHHONPOWERSOURCEFAILUREANALYSESNINEHILEPOINT2SHEET21OF70POWERSOURCESYSTEHCOMPONENTIDCOtlPONENTDESCRIPTION/FUNCTIONPRItfARYEFFECTSSECONDARYEFFECTSOTlfEREFFECTSCOMBINEDEFFECTS)2NPS-SWG001)2NJS-US4AI2NJS-US4CI2NJS-PNL400)2SCA-PNL403)(CONTINUED)IIII2DTH-hOV5h1>~)'.EXTRACTIONLINE)2DTHAOVSC~",IDRAINVALVESFORI2DTHAOV3hITHIRD>FOURTH>I2DTHAOV3C)FIFm>ANDSIXTH)2DTH-AOV2A)POINTHEATERS"h"2DTtl-.AOV2C)AND"C"20TH-AOV8hI2DTH-AOVSCIIVALVESFAILOPEN.LOSSOFVAIVEPOSI-)T10NINDICATIONIN)CONTROLROOH.)PARTIALLOSSOFCONDENSATE/FEEDWATERHEATINGATTHIRDPOINTNEATFRSI2CNH-E3AANDI2CNHE3C>FOURTHPOINTHEATERS)2CNH-E4AAND2CNH-E4C,FIFTHPOINT)IlEATERS2CNM-E5AAND2CNH-ESC,ANDSIXTHPOINTHEATERS)2FWS-E6AANDII2FWS-E6C.INCREASElIINREACTORCOREPOWERIIANDtlODULATIONOFICOREFLOW.INCREASED))STEAHFLOWTOHAINCONDENSERIIlI12-2463

I'IfIIII'llIII'IIIII'li'III'III'IIIII'I'lIIIIII'IIIIIIIlI'IIIIIIII'III'IIIIIII'III'IIIIIIIIII'I'IIII'I'llII'I'III'III'II'I'IIII

APPENDIXCCONTROLSYSTEMSCOMMONPOMERSOURCEFAILUREANALYSESNINEltlLEPOINT2SHEET23OP70POMERSOURCEI2NPS-SNC0012NJS-US4A2HJS-US4C2NJS-PNL4002SCA-PHL404(CONTINUED)II2NPSNtG0012NJS-USBA2NHS-MCC015hI2HPS-SttGOOII2HJS-USBA2HHS-MCC015COFG20PG-P1AI20PG-REFIAI20FG-REF2hCOMPONENTIDDTMI2DTMAOV4b<Imn-hOV6S':.I2DTMAOV7b.III2DTM-AOV30$I2DTMAOV31BICOMPOHENTDESCRIPTION/FUNCTIONI':AUXILIARYSTEAM'.LINEDRAINVALVESISTEAMJETAIRIEJECTOR"B"MOTIVEISTEAMLINEDRAINIVALVESIOFPGASSYSTEMIVACUUMPUMPIIOFPCASSYSTEMIDRYERIAREFRIGER-IATIONUNITSFORCOHDEllSINGAHDIFREEZIHCCOILSIPRIMARYEFFECTSIVALVESFAILOPEH.ILOSSOFVALVEIPOSITIONINDICATIONIIHCONTROLROOM.IIVALVESPAILOPEN.IQtSSOFVALVEIPOSITION.ILOSSOPPUMPIIILOSSOFDRYERlhSECONDARYEFFECTSIHCREASEDSTEAM-PLOWITOMAINCONDENSER.IINCREASEDSTEAMFLOMITOMAINCONDENSER.IIIIIIILOSSOF1OUTOP2IOOXCAPACITYPUMPSIILOSSOP1OUTOF3IOOXCAPACITYDRYERSINONEsSTANDBYPUMPISTARTSAUTOMATICALLYIINONEsSTANDBYDRYERISTARTSAUTOMATICALLYCOMBINEDEFFECTSIILOSSOFTHISBUSIDOESHOTAFFECTIRPVPRESSUREsIHATERLEVEL,ORPONEROPCI20FC-REP)CI20FC"REP2CIOFPCASSYSTEMIDRYER1CREFRIGERIATIOHUHITSFORICONDEHSLNGANDIFREEZINGCOILSILOSSOFDRYER1CILOSSOF1OlEOF3INOHE,STAHDBTDRYERI100'APACITTDRYERSISTARTSAUTOMATICALLTILOSSOFTHISBUSIDOESNOTAFFECTIRPVPRESSURE,IHATERLEVEL,ORIONER12"2463

APPENDIXCCONTROLSYSTEMSCOMMONBNERSOURCEFAILUREANALYSESHIHEMILEPOINT2-SHEET24OF10POVERSOURCE>>COMPONENTIDCOMPONENTDESCRIPTION/FUNCTIONPRIMARYEFFECTSSECOHDARYEFFECTSOTHEREFFECTSCOMBINEDEFFECTS2HPSSHG0012NJSUSIOA2TMB(PUP."-g,-,(i,TURBINEEHCgj-',(~HYDRAULICFLUID.('UMPLOSSOFPUMP(LOSSOF1OUTOF2IIOOXCAPACITYPUMPS(NONE>>STANDBYPUMPILOSSOFTHISBUS(STARTSAUTOMATICALLY(DOESHOTAFFECT(ONLOMDISCHARGE(RPVPRESSURE,(PRESSUREIHATERLEVEL>>OR(ONER2NPS-SHGOOI2NJS-USIOA2NHS-MCCOIOACNM(2CNM-MOV32h(2CNM-MOV33AESS(2ESS-MOV3AI(2ESS-MOV15A((2ESS-MOV22A((2ESS-MOV28h(SIXm>>THIRD,FOURTH,ANDFIFTHPONTHEATERS2RS-E6A>>2CNM-E3h)2CNME4h)AND2CNM-E5hEXTRAC-TIONISOLATIONVALVES.(VALVESFAILASIS,(LOSSOFVALVEPOSIITIONIHDICATIOHIHICONTROLROOM.CONDENSATEHEATERIVAlVEFAILASLOSSOFSTRINGhOUTLET(VAI.VEPOSITIOHIHDI-ANDINLETBLOCKICATlONINCONTROLVALVESIROMI(VALVESNORMALLYKEPT(OPEN.UNABLETOIISOLATEHEATERSTRINGI"h"IFMATERLEVELIS(HIGHINFIRST/SECOND(POlHTHEATER(2CNM-Elh/2CNM-E2A.IIVALVESHORMALLYKEPT(OPEH.UNABLETOCLOSEVALVERIEN(ASSOCIATEDHEATER(MATERLEVELISHIGH.(LOSSOFTHISBUS(DOESNOTAFFECT(RPVPRESSURE,(MATERLEVEL>>ORPOlKR2NPS-SHGOOI2NJS-USIOA2NHS-MCCOIOA2NHS-MCC010CCNM(2CNM-MOV32C(CONDENSATEHEATER(VALVESFAILASIS,(VALVESNORMALLYKEPT2CNM-MOV33C(STRINGCOUTLET(LOSSOFVALVEPOSI(OPEN.UNABLETOISOIANDINLETBLOCKITIOHINDICATIONIH(LATEHEATERSTRING(VALVES(CONTROLROOM.("C"IFHATERLEVELIS(IHIGHINFIRST/SECONDIPOINTHEATER(2CHM-ElC/2CNM-E2C.(LOSSOFTHISBUSIDOESNOTAFFECTIRPVPRESSURE>>(HATERLEVEL,OR(PONER12-2463

APPENDIXCCONTROLSYSTEMSCOMMONBNERSOURCEFAILUREANALYSESNINEMILEPOINT2SHEET25OF70PtNERSOllRCESYSTEMCOMPONENTIDCOMPONENTDESCRIPTION/FUNCTIONPRIMARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOMBINEDEFFECTSIeI2NPS-SNGOOI2HJS-USlOA2NJS-USlOCi2NPSSNG001!I2NJS"USlOAI(CONTINUED)..,II2ESS,+VISC:)I2ESS;MOV22C'.II2ESS-MOV2BCIIIIIIESSI2ESS.MOV3C~SIXTH,THIRD,FOURTH,ANDFIFTHPOIHTHEATERS28tSE6C)2CHM-E3Co2CNM-E4C,AND2CNM-ESCEXTRAC-TIONISOLATIONVALVES(VALVESFAILASIS.fLOSSOFVALVEPOSI-ITIONIHDICATIOHIN)COHTROLROOM.IIVALVESNORMALLYKEPTIOPEN.UNABLETOICLOSEVALVEllHENIASSOCIATEDHEATERIMATERLEVELISHIGH.II2NPSSNG003IIIIASB352IAS-ClCIINSTRUMENTAIRICOMPRESSORB35COOlbIREACTORIRECIRCULATIOHPUMP2CNM-P2BCONDENSATEBOOSTER2CHM-P2CIPUMPSIlOSSOFCOMPRESSORILOSSOFPUMP.LOSS)OFRECIRCULATIONLOOP(BFLOH.I(LOSSOFPUMPSILOSSOFlOUTOF3IIDOLCAPACITYCOMPRESSORSiRECIRCULATIONRUNBACKIIIlLOSSOF2OUTOF2RUNNINGPUMPSHILLIRESULTIHTOTALLOSS)OFCO}IDEHSATEFLOH,IREACTORFEEDPUMPS(TRIP,ANDREACIORSCRAMILOSSOF1OUTOF2)RVNHIHGPUMPSMILL}RESULTIHSLIGHTiREDUCTIONOFREACTORINLETFLOV,RECOVER-INGTONORMALMKH)STANDBYPUMPSTARTSINONE,~STANDBYICOMPRESSORSTARTSiAUTOMATICAI.LYONMMI'ISCHARGEHEADER)PRESSUREIII('LOSSOFTHISBUSIDOESNOTAFFECTIRPVPRESSURE~IMATERLEVEL>ORiViIIIlh'REFERTOSECTION)4.0OFTHISREPORTI~)FORCOMBINEDIEFFECTSASSOCIATEDI~IltITHLOSSOFBUSI2HPS-SNG003.llWtII.I~IIIl2-2463

APPENDIXCCONTROLSYSTEHSCOHHONPOWERSOURCEFAILUREANALYSFSNINEHILEPOINT2SHEET26OF70IIIPOWERSOURCEII2NPS-SMG003(CONTINUED)IIIIIIIIIII12-2463SYSTEHCOHPONENTID2CMS-P1B205-PID2Cl5-PIP285-PIB2R5-PICCOHPONENTDESCRIPTION/FUNCTIONIIIIIIII/ICIRCULATINGMATER(PUHPSIIIIIIIREACTORFEEDMATERPUHPSIIIIIIIIIIIIIIIIIIIIIIII(PRIHARYEFFECTS(LOSSOFPUHPS.PARTIALLOSSOFHAINCONDENSERCOOLING.IIIIIILOSSOFPUHPSIIIIIIIIIIIIIIIIIIIIIIIIIISECONDARYEFFECTSLOSSOF2OUTOF3RUNNINGPUHPSWII.LRESULTINREDUCTIONOFREACTORINLETFLOMIWHICHMILLRECOVERIPARTIALLYWHENPUHP(2CSTARTSFROH2NPS-SWG001.RECIRC-UIATIONRUNBACKAND(TURBINERUNBACKMILLIRESULT.ILOSSOFHAINICONDENSERVACUUHATAPPROXIHATELY12IINCHESHG/HIN.TURBINETRIPINAPPROXIHATELY45SFCONDS.REACTORISCRAH.I(LOSSOF1OUTOF2IRUNNINGPUHPSMILI.IRESUITINRECIRCULA-TIONRUNBACKAND(TURBINERUNBACK.REACTORLEVELIDECREASESHOHENTAR-IILY,TNENINCREASES(ANDREACHESNORHAL(LEVEL.LOSSOF2OUTOF2RUNNINGPUHPSWOULDRESULTIN(REACTORSCRAH.IIIIIIIIIIIII.(OTHEREFFECTSCOHBINEDEFFECTStelM~C~Ul

APPENDIXCCONTROLSYSTEHSCOtSONPOMERSOURCEFAILUREANALYSESNINEllILEPOINT2SHEET27OF70POMERSOURCESYSTEM~(2NPS-SMG0032HNS-5MG013COMPONENTIDCOHPONENTDESCRIPTIOH/FUHCTIONPRIMARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOHBINEDEFFECTSB35CCPCCSB35-S001BIRECIRCULATIOHPUMPIBLFXGSETlKTORII2CCP-P3A(REACTORBUILDING(CLOSEDLOOPCOOLIHGMATERBOOSTERPUXPI2CCS-PIB(TURBIHEBUILDING(CLOSEDLOOP(COOLINGMATERPUHP(LOSSOFLFHGSET(LOSSOFPUXPIIIIILOSSOFPUXPIIILOSSOFRECIRCULATIONIPUXPB35-C001BLOM(SPEED/FLOMCAPABILITYIILOSSOF1OUTOF3(50$CAPACITYPUMPS(LOSSOF1OUTOF3(50$CAPACITYPUMPSIXONEDURIHGNORXAL(POMEROPERATIOHII(HONE,STANDBYPUXPSTARTSAUTOXATICALLY(ONLOMDISCHARGE(HEADERPRESSUREIINONEsSTANDBYPUXPSTARTSAUTONATICALLYIOHLOMDISCHARGEIHEADERPRESSUREIREFERTOSECTION(40OFTHISREPORT((FORCOXBINEDIEFFECTSASSOCIATED(MITNLOSSOFBUS(2HXS-SMG013(2HPS-SMG003(2NHS-SMG013I2CNX-PlBICONDEHSATEPUHPSILOSSOFPUHPS2CNll-PICLOSSOF2OUTOF2IRUNNINGPUXPSMILLRESULTINTOTALLOSSIOFCONDENSATEFLOMsCONDENSATEBOOSTERlPUXPSTRIPsREACTOR(FEEDPUXPSTRIPANDIREACTORSCRAlj.LOSSIOF1OUTOF2RUNNIHGI(PUXPSMILLRESULTIN(REDUCEDINLETFLOMTO(IREACTORsMXICH'MILLIRECOVERTONORXALIFISTANDBYCONDENSATE(PUXPSTARTS.LOSSOF(2OUTOF3RUNNINGIPUNPSMILLRESULTINIREDUCTIOHOFREACTORIINLETFLOMMNICHMILL(RECOVERPARTIALLYIF(2CHX-PICSTARTSPROX2HNS-SMG011.RECIRC-(ULATIOHRUNBACKANDITURBINERUNBACKALSO(MILLRESULT.l2-2463

APPENDIXCCONTROLSYSTEHSCOtQSNPOWERSOURCEFAILUREANALYSESNINENILEPOINT2SHEET28OF70POWERSOURCECOHPONENTIDCOHPONENTDESCRIPTION/FUNCTIONPRIHARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOHBINEDEFFECTSI2NPS"SMG003I2NNS-SMG013(CONTINUED)Plb)FOURTHPOINTfLOSSOFPIHEATER2CNN-E4BIDRAINPUHPI2HDLUHP)FOURTHPOINTHEATERI2CNHE4BWATERLEVELi'MILLINCREASE.EHER-GEHCYDRAIHVALVE2HDL-LV24BMILLOPEHITODRAINWATERTOHAIHCONDEHSER.)PARTIALLOSSOFFEED-IMATERHEATIHGIRESULTIHGININCREASEIIOFCOREPOWERAND)HODULATIOHOFCOREIFLOW.REACTORIHLETiFLOMDECREASESANDTHEHRETURNSTONORHAL.IHCREASEINIHAIHCONDENSERMATERLEVEL.2NPS-SMG0032HHS-SWG015C12CCPC12-C001BILOSSOFPUHP2CCP-PlBIREACTORBUILDINGILOSSOFPUMP)CLOSEDLOOPICOOLINGWATERPUHPILOSSOF1OUTOF2IDOLCAPACITYPUMPSItLOSSOFIOUTOF3I50XCAPACITYPUNPSINONE,STANDBYPUNPSTARTSAUTOHATICALLYfONLOWDISCHARGEIPRESSUREI1INONE,STANDBYPUHPISTARTSAUTOHATICALLYIONLOMDISCHARGEIHEADERPRESSURE)LOSSOFTHISBUS)DOESHOTAFFECTIRPVPRESSURE~IWATERLEVEL~OR/POWER12-2463

APPENDIXCCOHTROLSYSTEMSCOMMONONERSOURCEFAILUREANALYSESHINEMILEPOINT2SHEET29OF70POHERSOURCECOMPONEtlTIDCOMPONENTDESCRIPTION/FUHCTIONPRIMARYEFFECTSSECONDARYEFFECTSCOMBIHEDEFFECTS)2NPS-SNG0032HHS-SNG015f2HPS-QC0032HHSSHG0152NJS-US6CPP3B,,f(REACTORBUILD')'LOSEDLOOPfCOOLIHGHATER)BOOSTERPUMP2CIHGILOSSOFPUMPILOSSOFIOUTOF3IHONEeSTANDBYPUMPI50XCAPACITYPUMPS)STARTSAUTOMATICALLY)ONLOHDISCllARGEfHEADERPRESSURE2NPS-SttG0032NHS-SHG0152NJS-US62NHS-MCC0122NPS-SNG0032NJS-US2B2HHS-MCC014B2NPS-StG0032HJS-US2B2NHS-MCC014BIASCCP21AS-C1BIINSTRUMENTAIRICOMPRESSORIOSSOFCOMPRESSORB35-D003BIHYDRAULICOILB35-P3BISUBLOOP2TOIRECIRCULATION)CONTROLVALVEIIB35-D003hlHYDRAULICOILB35P4AISUBLOOP2TOfRECIRCULATIONICONTROLVALVEPUMP(LOSSOFHYDRAULICIPUMPANDPRESSUREFORFLOHISUBLOOP2BIIBIIPUMPILOSSOFHYDRAULICIPUMPANDPRESSUREFORFratISUBLOOP2A~Ihll2CCP-P2BIREACTORBUILDINGILOSSOFPUMPCLOSEDLOOPCOOLINGHATERlINSTRUMENTAIRICOMPRESSORCOOLINGIfPUMPILOSSOFIOUTOF3IOOXCAPACITT(COMPRESSORSILOSSOF1OUTOF2I100$CAPACITYPUMPSII)HONE,RECIRCVALVE(FAILSASISAHD(SUBLOOPIBAVAILABLE(IHREADYMODE)II)HONE,RECIRCVALVE)FAILSASISANDISUBLOOPlhAVAILABLEI(INREADYMODE)INONE>STANDBYiCOMPRESSORSTARTS!AUTOMATICALLYONLOPIDISCHARGEHEADERIPRESSUREINONE>STANDBYPUMP)STARTSAUTOMATICALLYIONLOMDISCHARGEIHEADERPRESSUREILOSSOFTHISBUS)DOESHOTAFFECTtRPVPRESSURE>IHATERLEVELeORIPtHtKR)LOSSOFTHISBUS)DOESHOTAFFECTIRPVPRESSURE~IMATERLEVELsOR)POVER~C3II~II~VI)LOSSOFTHISBUStnaeSHOTAFFECTRPVPRESSUREyI/MATERLEVEL,ORJPOVERII~II~IIIC'I12-2463

APPENDIXCCONTROLSYSTEHSCemONPOWERSOURCEFAILUREANALYSESNINENILEPOINT2sHEET3oor7oPOWERSOURCESYSTEHi2HPS-SWG0032HJS-US3B2HHS-HCC006BCOHPONENTIDCOMPONENTDESCRIPTION/FUNCTIONPRINARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOHBIHEDEFFECTS2NPS-SWG0032HJS-US4B-FHIB)GENERATORLEADICOOLINGFAN2GHLSLOSSOFFANILossoFIoUTor2100$CAPACITYFANSI)NONE,STANDBYPAN(LOSSOrTHISBUSISTARTSAUTOHATICALLYIDOESNOTAFFECT1ONLOSSOFRUNHIHGIRPVPRESSUREsIFAN)MATERLEVELsORiPOWER2NPS-SMM032HJS-US7B2HJS-PHL70S2HJS-PHL74$2QlC-PIBtGENERATORSTATORILs)SSOFPUHPICOOLINGMATERPUHPI(LOSSOPIOUTOF2100'APACITYPUHPSIIINONE~STANDBYPUHPlLOSSOFTHISBUSISTARTSAUTOHATICALLYIDOESHOTAFFECTIOHLOMCOOLIHGMATERIRI'VPRESSURE,IHEADERPRESSUREIMATERLEVEL,ORIPOWEROPGI20PGRE13hIOPFGASPRETREAT-ILOSSOPANNUNCIATION(NABLETOISOLATEI20FG-RE13BIHEHTRADIATIONIIHCONTROLROONMHEHIOFFGASSYSTEHONHIGHIIHONITORSIRADIATIOHISHIGH)RADIATIONILOSSOFTHISBUSiDOESNOTAFFECTIRPVPRESSUREsIMATERLEVEL,ORPOWER.12-2463

APPENDIXCCONTROLSYSTEMSCOMMONHNERSOURCEFAILUREANALYSESNINEMILKPOIHT2SHEET31OF70POVERSOURCEI2NPS-SVG0032NJS-USBB2HHS-MCC015BOFGCONPOHENTID20FG-PIBI20FG-RKFIBI20FG-REF2BIIICOMPONENTDESCRIPTION/FUNCTIO}lOFFGASSYSTEM(VACUUNPUMPI(OFFGASSYSTEMIDRYER1BREFRIGERIATIOHUNITSFORICONDKNSIHGAND(FREEZINGCOILSPRIMARYEFFECTS(LOSSOiPUMPIIILOSSOFDRYERIBIIISECONDARYEFFECTSILOSSOF1OUTOF2100XCAPACITYPUMPSIILOSSOF1OUTOF3I100XCAPACITYDRYERSIIOTHEREFFECTSIHONEsSTANDBYPUMPISTARTSAUTONATICALLYIIHONE,STANDBYDRYERISTARTSAUTOMATICALLYCONBINEDEFFECTSILOSSOFTHISBUSIDOESHOTAFFECTIRPVPRESSURE,(HATERLEVELSORImrKRI2NPS-S}C003I2NJS-USlOBI2NPS-S00032HJS-US10B2HHS-MCC010B2TMB-FIBITURBINEKHCILOSSOFPUMPIHYDRAULICFLUID(PUNP(LOSSOF1OUTOF2I100XCAPACITYPUMPS(HONE,STANDBYPUMP(LOSSOiTHISBUSISTARTSAUTOMATICALLYIDOESHOTAFFECT(OHLO}lDISCHARGEIRPVPRESSURE,(PRESSUREIHATERLEVELSORIPOVKRCNMI2CNM-MOV328II2CNMNOV33BIII(I~lIESSI2ESSMOV3BII2ESS-MOV15BII2ESS-NOV22BII2ESS-MOV28BIIIIIISIXTH,THIRD,FOURTH,ANDFIFTHPOINTHEATERS28}S-E6B,2CHM-E3Bo2CHM-EAB,AND2CHM-ESBEXTRACTIO}lISOLATIONVALVES(VALVESFAILASIS.(LOSSOFVALVEPOSIITIOHIHDICATIONINICONTROLROON~COHDEHSATKHEATERIVALVESFAILASIS~STRIHGBOUTLET(LOSSOFVALVEPOSI-ANDIHLETBLOCKITIONIHDICATIOHINVALVESICONTROLROONIVALVESNORMALLYKEPTIOPEN.UHABLETOIISOLATEHEATERSTRINGIIBIFHATERLEVEL18IHICHIHFIRST/SECONDIPOIHTHEATERI2CHN-ElB/2CHM-E2B.IIVALVESNORMALLYKEPTIOPFH.UNABLETOICLOSEVALVERKN(ASSOCIATEDHEATERIMATERLEVELISMICH.ILOSSOFTHISBUSDOESNOTAFFECT(RPVPRESSURE~IHATERLEVEL>OR(PO}}ER12-2463

APPEHDIXCCONTROLSYSTEMSCOMMONPOMERSOURCEFAILUREANALYSESNINEMILEPOIHT2SHEET32OF70POMERSOURCEI2BYS-SMG00lh2BYS-SMGOOIA2BYSPNLA101COMPONENTID125VDCTURBINETRIPIAUXILIARYCIRCUITCOMPONENTDESCRIPTION/FUNCTIONTURBINETRIPFUNCTIONSFOR:THRUSTBEARINGMEAR;BEARIHGOILPRES-SURELOM;HYDRAULICPRESSURELOM;MOISTURESEPARA-TORHIGHLEVEL;LOSSOFSTATORCOOLANT;SHAFTPUMPDIS-CHARGEPRESSURELOM;EXHAUSTHOODTEMPHIGH;CONDENSERVACUUMLOM;10llTELECTRICALFAULTPRIMARYEFFECTSI"TllRBINETROUBLE"IANNUNCIATIONINICONTROLROOM.LOSSIOFTRIPFUNCTIONS.ISECONDARYEFFECTSLOSSOFTURBINEPROTECTIOHCOMBINEDEFFECTSILOSSOFTHISBUSIANDANCILLIARYIBUSES2BYS-PHA101,2BYS-PNLA102,ANDI2BYS-PHLA107DOESINOTAFFECTRPVIPRESSUREMATERILEVEL,ORPOMKRIIISEECOMBINEDIEFFECTSCOMMEHTIFOJIBUSI2BYS-SMG001ACJIIM2BYS-SMGOOIA2BYS-PNLAI02I2BYS-SMGOOIA2BYS-PHLA107C33IREACTORHIGHIILEVELTRIPILOGICCIRELAYCOILSIIIIIB35ILFMGSETAIIRELAYLOGICIIANDIPROTECTIVERELAYINGIPROVIDESREACTORHINILEVELTRIPSIGNALCINPUTTOTRIPREACTORFEEDPUMPSA,B,ANDCANDMAINTURBIHEIINITIATESHIGHLEVELICTRIPANDIAHNUNCIATIOHREACTORRECIRCULA-ILOSSOFABILITYTOTIONLFMGSEThITRANSFERTOLFMGRELAYLOGICANDISETAOPERATIONPROTECTIVERELAYINGINONE,ADDITIOHALHIGHILEVELTRIPhORBIREQUIREDTOTRIPITURBIHEANDREACTORIFEEDPUMPSILOSSOFRECIRCULATIONIIPUMPhLOMSPEED/FLOMIICAPABILITYISKECOMBINEDIEFFECTSCOMMENTIFORBUS2BYS-SMGOOIAISEECOMBINEDEFFECTSCOMMEHTIFORBUSI2BYS-SMG001A12-2463

APPENDIXCCONTROLSYSTEMSCOMMOHPOWERSOURCEFAILUREANALYSESNINEMILEPOINT2SHEET33OF70POWERSOURCEI2BYSSWGOOIBCOMPONENTIDB35BREAXER(IA/lBCMSE(ANDTRIPICIRCUITS(IIBREAXER(2A/2BCLOSEIANDTRIP(CIRCUITS(IIBREAKER'(SA/5BCLOSE(ANDTRIPCIRCUITSIIC12BIC12-C001A/IC12-COOIBIBREAKER(CLOSEAND(TRIP(CIRCUITSCOMPONEHTDESCRIPTION/FUNCTIONREACTORRECIRCULA-TIONSYSTEMlmh/BMOTORBREAKERCLOSEANDTRIPCIRCUITSREACTORRECIRCULA-TIONSYSTEMLFMCh/BGENERATORBREAKERCLOSEANDTRIPCIRCUITSREACTORRECIRCULA-TIONPUMP2RCS-Plh/2RCS-PlBBREAKERCLOSEANDTRIPCIRCUITSCONTROI,RODDRIVEPUMP2RDS-Plh/2RDS-P1BBREAKERCLOSEAHDTRIPCIRCUITSPRIMARYEFfECTS(LOSSOFBREAKERCONTROLANDPOSITION(INDICATIONINCONTROLIPOOMIIIIOSSOFBREAKER(COHTROLANDPOSITIONIINDICATIOHIHCONTROL(&00MIIILOSSOFBREAKERICOHTROLAHDPOSITIONIINDICATIONINCONTROLROOMII(LOSSOFBREAKER(COHTROLANDPOSITION(IHDICATIOHIHCOHTROLIROOMSECONDARYEFFECTSILFMGSETA/BDIS-(ABLED.LOSSOF(RECIRCULATIONPUMP(A/BLO'WSPEED/FLOWICAPABILITY.I(LFMGSETh/BDIS-ABLED.LOSSOF(RECIRCULATIOHPUMP(h/BLOWSPEED/FLOW(CAPABILITY.I(BREAKERNORMALLY(CLOSED.HOEFFECTIF(PUMPCANBETRIPPEDIBYBREAKER3ho4A/I3Bs4B.I(LOSSOFSTANDBYPUMP(AUTOSTARTOHLOSSOFLOSSOFRUNHIHGPUMP.(FAILUREWILLRESULTIIHLOSSOFCONTROL(RODMOVEMEHT,BUT(SCRAMAVAILABLE.OTHEREFFECTSINONEAT100'EACTOR(POWER(NONEAT10(gREACTORIPOWERCOMBINEDEFFECIS(REFERTOSECTION(4.0OFTHISREPORT(IFORCOMBIHEDI(EFFECTSASSOCIATED((WITHLOSSOFBUSI2BYS-SWG001B(t~~II~II~I0')I(rv12-2463

APPENDIXCCONTROLSYSTEMSCOMMONPOWERSOURCEFAILUREANALYSESNINEMILEPOIHT2SHEET34OF70POWERSOURCESYSTEMCOMPONENTIDDESCRIPTION/FUNCTIONPRIMARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOMBINEDEFFECTSI2BYS-SWGOOIBI(CONTINUED)CCPCCS2CCP-P3A/2CCP-P3B/2CCP-P3CBREAKERCLOSEANDITRIPCIRCUIT2CCS-P1A/2CCS-P1B/2CCS"P1CBREAKERCLOSEANDITRIPCIRCUIT(REACTORBUILDINGCLOSEDLOOPCOOLINGWATERIBOOSTERPUMPIBREAKERCLOSEANDITRIPCIRCUITIITURBINEBUILDINGICLOSEDMOPICOOLINGWATERPUMPIBREAKERCLOSEAHDITRIPCIRCUITI2CCPPlh/'-"'IREACTORBUILDING2CCPPIB/(CLOSEDIOOP2CCPPlC(COOLINGWATERPUMPBREAKERIBREAKERCLOSEANDCLOSEANDITRIPCIRCUITTRIPCIRCUITI(LOSSOFBREAKERCORTISOLAHDPOSITIONIIHDIOLTIOHIHCONTROLROOMIIILOSSOFBREAKERICONTROLAHDPOSITIONIINDICATIONIHCONTROLIROOMILOSSOFBREAKERICONTROLANDPOSITIOH(IHDICATIOHIHCOHTROL(ROOM(UNABLETOSTART(STANDBYPUMPFROMICOHTROLROOMONLOSS(OFONERUNNINGPUMP.IHOSIGNIFICANTEFFECT(SIHCEREACTORRECIRCIULATIOHPUMPCOOLERSIANDSPEHTFUELPOOLIHEATEXCHAHGERSCANIBKSUPPLIEDFROMISERVICEWATERSYSTEM.IISAMEASABOVEIIIUNABLETOSTARTISTANDBYPUMPFROM(CONTROLROOMOHLOSS(OFOHERUNNINGPUMP.IFAILUREWILLREDUCEIGENERATORSTATOR(COOLIHGRESULTIHGINITURBIHETRIP.Cfi;I12-2463

APPEHDIXCCONTROLSYSTEMSCOMMONRNERSOURCEFAILUREANALYSESNINEMILEPOINT2SHEET35OP10COMPONENTIDCOMPONENTDESCRIPTION/.FUNCTIONPRIMARYEFFECTSSECONDARYEFFECTS(2BYS-SQGGGIB((CONTINUED)2CHM-PICBREAKERCLOSEANDTRIPCIRCUIT2CNM-P2A/2CHM-P2B/2CNM-P2CBREAXERCLOSEAND(TRIPCIRCUITI2M-Plh2Cl5-PIB295-PIC205-PID205-PIE205-PlFBREAKERCLOSEAND(TRIPCIRCUIT(TRIPCIRCUITIIIIICONDENSATEBOOSTERIPUMPBREAKERCLOSE(ADNTRIPCIRCUITIIII(CIRCULATINGWATER(PUMPBREAKERCLOSEANDTRIPCIRCUIT2CNMPll/,~",~'OllDENSATEPUMP2CHM-P1B/"REAKERCLOSEANDILOSSOFBREAKERCONTROLANDPOSITIONIINDICATIONIHCONTROL(ROOMIII(LOSSOFBREAKER(CONTROLANDPOSITIOH(INDICATIONIHCONTROLIINeMILOSSOFBREAKERICONTROLAHDPOSITION(IHDICATIOHIHCOHIROL(ROOM.(UNABLETOSTART(STANDBYPUMP.FAILUREMILLRESULT(IHRECIRCULATION(RUNBACKANDTURBINE(RUNBACK.IIUNABLETOSTART(STANDBYPUMP.(FAILUREMILLRESULTIIHRECIRCULATION(RUNBACKANDTURBINE(RUNBACK.IIALLSIXCIRCUIATING(MATERPUMPSREMAIN(RUNNING.2M-Plh/2FHS-PIB/285-PICBREAXERCLOSEAND(TRIPCIRCUIT(I2GMC-Plh/2GMC-P1BBREAXERCLOSEAHD(TRIPCIRCUIT(FEEDHATER.PUMP(LOSSOFBREAKERBREAKERCLOSEANDICONTROLANDPOSITIONTRIPCIRCUIT(INDICATIONINCOHTROL(ROOMGENERATORSTATOR(LOSSOFBREAKERCOOLINGMATERPUMP(CONTROLAHDPOSITIONBREAKERCLOSEAHD(INDICATIONIHCOHIROLTRIPCIRCUIT(ROOM(UHABLETOSTART(STANDBYPUMPFROM(CONTROLROOM.IFAILUREMILLRESULT(INCONTINUEDLOV(PtWEROPERATION.I(UNABLETOSTART(STANDBYPUMPFROllCONTROLROOMONLOSS(OFRUNNIHGPUMP.(FAILUREHILLRESULTIINIHCREASEDIGENERATORMINDING(TEMPERATURELEADIHGITOTURBINERUNBACK.I12-2463

APPENDIXCCONTROLSYSTEMSCOMMOHONERSOURCEFAILUREANALYSESNINEMILEPOINT2SHEET36OF70POHERSOURCECOMPONENTIDCOMPONENTDESCRIPTIOH/FUNCTIONPRIMARYEFFECTSSECONDARYEFFECTSCOMBIHEDEFFECTS)2BYS-SHGOOIB(CONTINUED)IAS2IAS,CIA/'""'INSTRUMENTAIR21ASCIB/'COMPRESSORBREAKER21AS-ClCICLOSEAHDTRIPBREAXER)CIRCUITCLOSEAND)TRIPCIRCUITIILOSSOFBREAKERICONTROLANDPOSITIOHINDICATIOHIHCONTROLIROOM~COMPRESSORCOOLINGHATERVALVE2CCP-SOV87A/I2CCP-SOV87B/2CCP-SOV$7CFAILSIOPEN.COMPRESSOR)U!IIOADERVALVE21AS-SOV9A/I21AS-SOV9B/I21ASSOV9CihlLSCulSED.)LOSSOiCOMPRESSOROUTPUTTOAIR)RECEIVERTANKI21AS-TKlh/2IAS-TKIB/21AS-TKlC.LOSSOFIAIRPRESSUREINRECEIVERTANKSMILLNECESSITATEREACTORSCRAMAHDINITIATIONIOFECCSSYSTEMSIAFTERhPERIODOiITIMEyhllYOFTHEiFOLIANIHGEFFECTSMAYIiRESULT:IiI)SCRAMINLETAHDIIOUTLETVALVESOPENI2)STEAMJETAIREJECTORSTEAMSUPPLYVALVESCLOSE3)MSRADMISSIONVALVESCLOSEI4)STANDBYGASTREATMEHTSHITCHESTOSECONDARYCOHTAINMEHTi5)RCICSTEAMLIHEDRAINAHDRHRHEATIEXCHANGERSTEAMCONTROLVALVESCLOSE6)MINIMUMFLOQBYPASSESFORPEED-MATERsCONDENSATEsICONDENSATEBOOSTERIPSiPSOPEHi7)HNVELLLEVELCONTROLLOSTAHDMAKEUPVALVEFAILStOPEHII8)STANDBYLIQUIDICOHTROLSTORAGEITANKLEVELIHDICA-ITORREADSZEROI9)MSIVISOLATIONIUlK2IIII12-2463

APPENDIXCCONTROLSYSTEMSCOMMONONERSOURCEFAILUREANALYSESNINEMILEPOINT2SHEET31OF70POHKRSOURCESYSTEMCOMPONENTIDCOMPONENTDESCRIPTION/FUNCTIONPRIMARYEFFECTSSECOHDARYEFFECTSOTHEREFFECTSCOMBINEDEFFECTS(2BYSSHGOOIBI(CONTINUED)Jx>.2TMB"PlA/s(.;TURBINEEHC2TMBPlb'(.'HYDRAULICFLUIDBREAKERIPUMPBREAKERCLOSE'CLOSEAHD(AHDTRIPCIRCUITTRIPCIRCUIT((LOSSOFBREAKER(UNABLKTOSTART(CONTROLAHDPOSITION(STANDBYPUMPFROMIINDICATIONINCONTROL(CONTROLROOMOHLOSSIROOM(OFRUNNINGPUMP.IAN((HYDRAULICPRESSURE(MILLRESULTIH(TURBIHETRIPWITHOUTBYPASS.I12-2463

APPENDIXCCONTROLSYSTEHSCOlOfONPOMERSOURCEFAILUREANALYSESNINEHIKEPOINT2SHEET3$OF70POMERSOURCESYSTElfCOHPONENTIDCOHPONEHTDESCRIPTION/FUNCTIONPRINARYEFFECTSSECONDARYEFFECTSCOHBINEDEFFECTSI2BYS-SMG00182BYS"PNLB101l2BYS-SMGOOIB2BYS-PNLB107'j."i6'f:C33(RRCSLOGIC'IIII(REACTORHIGHI(LEVELTRIP(LOGIC"B"/K624BREDUNDANTREACTIV-ITYCONTROLSYSTEM(RRCS)FEEWATERRUNBACKIHITIATIOHHIGHRPVLEVELTRIPTOREACTORFEEDPUHPSANDHAINTURBINECONVERTER(CNBPOMERTOSRU6CIRCUITICONDENSATESYSTEM2CNHN06(AUXILIARYCIRCUITILOSSOFRRCSRUNBACKICAPABILITYIIIIHIGHLEVELTRIP'iB'NITIATED(LOSSOFFEEWATERlFLOM"Bi'IGHAL(LOSSOFCONDEHSATE(ANDCONDENSATEIBOOSTERPUffPAUTO(STARTPERHISSIVESINONEeMOULDNOTBE(ABLETORUHFEEDMATERIBACKOHAHAIMSEVENTIl(HONE,TMOOrTHREE(HIGHLEVELTRIPISIGNALSREQUIREDTO(TRIPREACTORFEED(PUMPSAHDffhIHITURBINEIISTEANFEEWATERFLOM(tflSHATCNRESULTIN(FEEDMATERVALVES(OPEHIHGTOINCREASEIFEEDMATERFLOMI(LOSSOFAUTOSTARTOFISTANDBYPUHPOHLOSS(OFRUNHINGPUMP.(FAILUREMILLRESULT(IHRECIRCULATION(RUNBACKANDTURBINE(RUHBACK.ILOSSOFTHISBUS(MOULDRESULTIHh(HAINTURBINETRIPIOHHIGHMATERLEVELIINCREASEIHREACTOR(MATERLEVELMOULDIRESULTIHFEEDMATERPUNPTRIPANDTURBINE((TRIPI(m(fQIl~II~II'uB35(LFHGSETB(REACTORRECIRCULA-(LOSSOrABILITYTOIRELAYLOGICITIONLFffGSETB(TRANSFERTOLFHG(AND(RELAYLOGICAND(SETBOPERATION(PROTECTIVE(PROTECTIVERELAYING(RELAYINGILOSSOFRECIRCULATIONI(PUtfPBQNSPEED/Fll%(ICAPABILITYILOSSOFTHISBUS(DOESNOTAFFECTIRPVPRESSURE>IMATERLEVELSORPOMER12"2463

APPENDIXCCONTROLSYSTEMSCOMMONONERSOURCEFAILUREANALYSESNINEMIIZPOINT2SHEET39OP70POVERSOImCESYSTEMI2VBB-UPSIA2VBS-PHLA101COMPONEllTIDp~c.=COMPONENT*DESCRIPTION/FUNCTIONPRIMARYEFFECTSSECONDARYEFFECTSCOMBINEDEFFECTSB35'K616h-'IIRECIRCIKATIONHAN(CONTROLVALVEIF060APARTIAL(CLOSUREINITIATION(ORRESETK695-I/K6952K648h(RECIRClKATION(PUMPSCAVITATIONIIHTERIAKKSI'IRECIRCULATIONLOOPIhPLOMCONTROLLERK674A/K680hIK635AIRECIRCIKATIONHAN(CONTROLVALVEIP060hVALVEPOSI-(TIONAMPLIFIERANDIVALVEMOVEMENTIVEIOCITYAMPLIFIERI(PEONSIGHALICONVERTERK644/K649(MASTERCOHTROLIZRIRECIRCULATIOHFIAN(AHDFLUXICONTROLLERIDISABIZSVALVEIPARTIALCLOSUREOHIRFACTORFEEDPUMP(TFlPSIGNALORRESET(FUNCTIONAFTERIPP3TIALCLOSUREIII(CHIHOTTRANSFER(RECIRCIKATIOHPUMPSITOIANSPEEDONNPSHITOSSIDISABIZSAUTOAND(MAHUALPIANCONTROL(SIGNALSII(LOSSOFAMPLIFIERIOUTPUI'IGNALIIIIIILOSSOFCONVERTER(OUTPUTSIGHALIIOSSOPCONTROLISIGNAL(NONE,UHIZSSAFEED-IWATERPUMPTRIPSAHDICAUSESRPVIANHATERILEVELTRIPTOIPARTIALLYCLOSEVALVEIIII(HONEIHANCONTROLVALVEF060ALOCKSUPINIOSS-OF-SIGNALIPOSITION(IHANCONTROLVALVEIF060hLOCKSUPINIIOSS-OF-SIGNALPOSITIONIHANCONTROLVALVEIF060ALOCKSUPIHILOSS-OF-SIGHALIPOSITIONIRECIRCULATIONHANCONTROLVALVESP060AIAHDF060BREMAIHATLOCKEDPOSITIONDUE(TOTOTALCONTROL(SIGNALLOSSIIFVALVEREMAINSLESSITHAN19'XOPEHPORIMORETHAN15SECONDS,ITHERECIRCULATIONIlOOPAFLINlOLLITRLHSFERTOLFMGSETIOPERATIOHeREDUCINGIREACTORPOMERIFIXEDRECIRCIKATIOHILOOPhCONTROLIFIXEDRECIRCIKATIONILOOPhCONTROLIFIXEDRECIRCIKATIONIMOPhCOHTROL(FIXEDRECIRCIKATIONIAAHDBLOOPCONTROLIREFERTOSECTION4.0OFTHISREPORT(IFORCOMBINEDIIEFFECTSASSOCIATEDIINITHIOSSOFBUSI2VBS-PNLA101

APPENDIXCCOHTROLSYSTEHSCOHMONONERSOURCEFAILUREANALYSESNINEMILEPOINT2SHEETAOOF10POMERSOURCECOMPONENTIDCOMPONENTDESCRIPTION/FUNCTIONPRIHARYEFFECTSSECONDARYEFFECTSCOMBINEDEFFECTSI2VBB-UPSIAI2VBS-PHLAIOII(CONTINUED)B35IRODSELECTNODULEZlIINPUTIISOLATORI/IINPUTIISOLATOR2ACTIVITYCONTROLPAGE21/ACTIVITYCOHTROLPAGE22HPUA.ICONTROLICIRCUITSIIC12RECIRCULATIONFLOMCONTROLVALVEF060AHYDRAULICONERUNITCONTROLOPERATORRODSELECTCONTROLDRIVECONTROLCABINETSIGHALISOLATORIRECIRCULATIONFLOMICONTROLVALVEF060A(LOCKSUPATLASTIPOSITIOHIIOPERATORCANNOTISELECTAHDHOVERODSIILOSSOFSIGNALSTOIRODDRIVECABIHETDETERMINESIFRODIACTIVITYCONTROLCARDMOTIONPERMISSIBLEIDISABLEDIIFIXEDLOOPhFLOMICONTROLIDOESNOTINTERFEREIMITHSCRAMIIRICHTSIDE/LEFTSIDEIRODSCANHOTBEHOVED.IDOESHOTINTERFEREIMITHSCRAM.IIRICHTSIDE/LEFTSIDEIRODSCANNOTBKHOVEDRODMOTIONTIMERZ21IIANALYZERPAGEh3IIIIIIIPROVIDESTIMINGFORRODIHOROUTHOVEHENTCOMPARESACTIVITYCOHTROLPAGE21AND22AHDIFSICNALSHATCH,RODHOTIOHALIANKD(LOCKUPANDALARMIFERRORLIMITEXCEEDED)ILOSSOFTIHINCSICHALIIIILOSSOFSIGHALSTOIALLBRANCHHODULESiIAHDLOSSOFFAULTHAPIDISPLAYIIIRODSCANNOTBEMOVEDIIIIRODSCANNOTBEHOVEDIIIICAIIl~I12-2463

APPENDIXCCONTROLSYSTEHSCOHHOHPOMERSOURCEFAILUREANALYSESHINENILEPOINT2SHEET41OF70POMERSOURCESYSTEHCOHPONENTIDCOHPONENTDESCRIPTION/FUNCTIONPRIHARYEFFECTSSECONDARYEFFECTSCOHBINEDEFFECTS)2VBB-UPSIAI2VBSPHLA101(CONTINUED)I'12)BRANCHAHP)CARDLEfT/))RIGHTBRANCH)JUNCTIOHNODULESELHI/BMRIBHL2/BHRZBML4/BHRABHL5/BHR5BHL6/BHR6BML7/BHR7PROCESSACKNOW-LEDGEANDCOHHANDlORDSTOALLOMNCUHOVEHENTOFRODSINGROUPUNDERLEFT/RIGHTHCUCONTROL)LOSSOFSIGNALSTO)LEFT/RIGHTRODSICONSOLRODSIHGROUPICANNOTHOVE)ASSOCIATEDMITHLEFT/)IRIGHTBRANCHMODULESOUTPUI'DRIVECONTROLISOLATORA4)CABINETOUTPUTISIGNALISOLATORIRDCCRELAYS)ITOC12-F007h)ANDC12-F007BC12-F007AANDC12-F007BSTABILIZERVALVESP616RDCCIRODDRIVECONTROLCOHPUIER)CABINETCOHPUTERINPUTS)INPUTS)LOSSOFDRIVECABINET)OUTPUTTOBRANCHIJllHCTIONNODULESAND)LOSSOFRODANDIDETECTORDISPLAYINPUTFORRODSI)REDUCTIOHIHCONTROL)RODDRIVEPRESSURE)REGULATIOHCAUSIHGIPRESSUREINCREASE)THATISSTABILIZEDBY)PRESSUREEQUALIZING)VALVEI)LOSSOFSIGHALTO)ACTIVITYCONTROLIHODULEICANNOTHOVERODS))NONEIIIIICANNOTHOVERODS12-2463

APPENDIXCCONTROLSYSTEMSCOMMOHONERSOURCEFAILUREANALYSESNINEMILEPOINT2SHEET42OF70POJJERSOURCESYSTEMCOMPONENTIDCOMPOHEllTDESCRIPTION/FUNCTIONPRIMARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOMBINEDEFFECTSI2VBB-UPSIA2VBS-PNLAIOII(COJmmZO)C12ITRANSPONDER.ICARDFORfEACH)INDIVIDUAL)CONTROLRODHCUINORDANDCONTROLIONERTODIRECITIOHALCOHTROLIVALVESTOMOVERODIAHDRETURNSSTATUSIOFCONTROLRODIDRIVECIRUCITS.IACCWULATORPRES-ISUREAHDLEVELISCRAMVALVEPOSI-)TIONSHITCHES.)SCRAMIEST(SHITCHES.IICONTROLSRODMOVEIMENTBYPERMISSIVEITOMOVERODIICONDENSATEBOOSTER)PWP2CHM-P2A/I2CHM-P28/2CHMP2C)SUCTIONFlAWITRAHSMITTERIRODPATTERNICONTROLLER22I)2CNM-FT38A/f2CHM-FT388/I2CHM-FT38C'@.~f.;'.IACCEPTSCOMMANDtCANNOTMOVERODSIIlII(CANNOTMOVERODSIIFBACKUPRNERFROMI2VBS-PHLB101ISALSOLOST:)LOSSOFCONTROLROOMINDICATIONOFPWPISUCTIOHFIANANDIANALOGIHPUTTOPLANTtCOMPUTER.IHADVER-ITENT"CONDENSATEBOOSTERPWPSUCTIONIFIANLOU"AHNUNCIA-ITIOHINCONTROLROOM.ILOSSOFMODULATINGISIGHALFORBOOSTERIPWPRECIRCULATIOH(VALVE2CHM-FV38A/I2CHM-FV388/2CHM-FV38C.I2CNMFV38hyFV38ByIFV38CFAILOPEH.IFEEDVATERFLOHTOIREACTORREDUCED.RECIRClJLATIOHFIANIRUNBACKAHDTURBINE)RUNBACK.IHCREASEINI(MAIHCONDENSERHATERILEVEL)V1Ilm12-2463

APPENDIXCCONTROLSYSTEHSCOHHOHPOMERSOURCEFAILUREANALYSESNINENILEPOINT2SHEET43QF10POMERSOURCECOHPONEHTIDCOHPONENTDESCRIPTION/FUNCTIONPRIHARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOtSIREDEFFECTS(2VBB-UPSIA(2VBS-PNLA101(CONTINUED)CNHI2C(DI-FT68h/I(2CIDI-FT68B/((2CNH-FT68CREACTORFEEDPUHP2FMS-Plb/2FMS-PIB/2FMS-PICSUCTIONflANTRANSHITTERI2CNHFT114ICONDEHSATEPUHP(DISCHARGEHEADER(FUNTRAHSHITTERIFBACKUPPOMERFROH(2VBS-PNLB101ISALSO(LOST:(LOSSOFSUCTIOHFUN(iHDiCATIOHiNCONTROLIROONANDANALOGINPUTITOPLAHTCOHPUTER.INADVERTENT"REACTOR(FEEDPUHPSUCTION(FLOMLOlPANNUNCIA(TIONIHCONTROLROOM.lLOSSOFHODULATIHG1SIGNALFORFEEDPUHP1RECIRCULATIONVALVE(2FMR-FV2A/2FMR-FV28/(2FMR-FV2C.IIFBACKUPPOMERFROHI2VBS"PHLB101ISALSO(LOST:(LOSSOFDISCHARGE(FLOMINDICATIOHIH(CONTROLROONAND(ANALOGIHPUI'OPLANT(COHPUTER.IHADVER-(TEHT"LO'MCONDEHSATEIDISCHARGEHEADER(FLOM"ANNUNCIATIONIN(CONTROLROON.LOSS(OFHODULATIHGSIGNAL(FORCONDENSATEPUHP(RECIRCULATIOHVALVE(2CNH-FV114.I2FMR-FV2he2Be2CFAIL(OPEN.FEEOMATERFLOM((TOREACTORREDUCED.IRECIRCULATIOHRUNBACKIIANDTURBINERUNBACK~IHCREASEINHAINCON-(DENSERMATERLEVEL.I2CNH-FV114FAILOPEN.(CONDENSATEFLOMlREDUCED.RECIRCULA-(TIONRUNBACK.ITURBINERUNBACK.(IHCREASEIHHAINCON-(DENSERMATERLEVEL.(III~III49(IOI12-2463

APPENDIXCCOHIROLSTSTEHSCOHHONPOVKRSOImCEfbiLUREANALTSESNINENILEPOINT2SHEET44OF10wmsomcaI2VBBUPSIAI2VBS-PHLA101)(CONTINUED)ONPONENTIDCRS2CRSPT102IIIII2HDL-FT3SA/(I2HDLFT35B/tI2HDLFT35CIIIHDLI2HDL-LT4A/I2HDL-LT4B/I2HDL-LT4CCOHPONKNTDESCRIPTION/FUHCTIOHLOADUNBALANCEIHTERHKDIATESTEAIIPRESSURETRANSHITTERFOURTHPOINTHEATER2CHH-E4h/2CO-E4B/2CO-E4CLEVELTRAHSHITIERFOURTHPOINTHEATERDRAINPUHP2HDL-Plh/2HDL-PIB/2HDL-PICDISCHARGEHlWTRANSHITTKRPRIHARTEFFECTSIFBACKUPRNERFROIIIPERHAHKHTIIAGHET)GENERATOR(PHG)IS)ALSOLOST:LOSSOFSTEANPRES-iSURESIGNALToPOVER-LOADUNBALANCEUNIT(IFBACKUPPOVERFROII2VBS-PHLBIOIISALSOLOST:ILOSSOFLEVELINDICAITIONINTHECOHTROL1ROON,ANDANALOGIHPUTTOPLANTICOIIPlllKR.LOSSOFIHODULATINGSIGHALFOR)2HDL-LV4A/2HDL-LV4B/)2HDL-LV4C.IIFBACKUPPOMKRFROH(2VBS-PNLB101ISALSO(LOST:(LOSSOfDISCHARGEiHANINDICATIONIN)CONTROLROON.LOSSIOFHODULATIHCSIGNALIFORRECIRCULATIONIVALVE2HDL-FV35A/I2HDL-FV35B/I2HDL-FV35C.SECONDARYEFFECTS)REDUCESLOADREFERIENCESIGNALTOZEROS)RUNSTHELOADREFER-)ENCEROTORBACKTOfZEROLOADREFEREHCE)POSITION.FAST)CLOSUREOFTURBINECONTROLVALVES.IREACTORSCRAII.II2HDL-LV4h,LV4B,LV4C)FAlLCLOSED.LOSSOF)fDRAINPIMPS2HDL-PIA,)2HDL-PlB,AND)2HDL-PICDISCHARGETOtICONDKNSATKSYSTEII.)TOTALFuNToTHE(REACTORREDUCED.IRECIRCULATIONRINBACKIANDTURBINERUNBACK.2HDL-FV35heFV35BsIFV35CFAlLOPENIHEATERDRAINPUHPIDISCHARGEToCONDEN-ISATESYSIEHHILLBElREDUCED.REACTORIHLETFLOMDECREASESIANDTHENRETURNSTOINORHAL.REDUCEDIFEEINATKRINLETITKHPERATURERESULTIHG)IIHIHCREASEIHCOREIBNKRANDIIODULATIONOFCOREfIAN.COHBINEDEffECTSIlhotl~III122463

APPENDIXCCONTROLSYSTEHSCOHHONPOMERSOURCEFAILUREANALYSESNINEMILEPOINT2SHEET45OF102Vbb-lJPSIA2VBS-PNLA101(CONTINUED)IDPp,,l2iVIIASTERITRIPBUSIcQfpoHEHTDESCRIPTION/FUNCTIONTURbINETRIPFUNCTIOHSFOR:THRUSTBEARINGHEAR;BEARINGOILPRESSUREIANlNISTURESEPARATORHIGHLEVEL;LOSSOFSTATORCOOLANT;SHAFTPUHPDISCHARGEPRESSUREllN;EXHAUSTHOODTEHPERATUREHIGH;CoHDEHseRVACUUHIlN;UNITELECTRICALFAULTIVIBRATIONHIGH;rassorspeEDSIGNALFEEDBACK'hcKUpoveRspEEDPRIHARTEFFECTS)IFBACKUPPOMERFROHPERHAHEHTHAGHETGEHERATORISALSOLOST~RASTERTRIP(VALVESOLEHOIDS)HSTV-AAHDHSTV"bIDEEHERGIZEDSECONDARYEFFECTSTURBINETRIPSTEANiBYPASS)ANDIPRESSUREfREGULATIONMADIRUNBACKlNTORREFERENCECIRCUITlTURBINEEHC)CONTROLCIRCUITItlKJTORINOPERABLElrBACKUPPOMERFIHNI)PEIHEHTHAGHET)GENERATOR1$LOST'ossorBTEAHFLOHtCONTROLINTOTURBINEtAHDBYPASSTO)CONDENSER)IOSSOFTURBINE)RUNBACKFUNCTIONONILossorcooLAHTIITlJRBINETRIPNTHIBYPASSVALVES)INHIBITEDTOOPEN)CONTROLVALVES,)IHTERHEDIATEVALVES,lANDSTOPVALVESCLOSE)12-2463

APPENDIXCCONTROLSYSTENSCOtSONPOSERSOURCEFAILUREANALYSESHIHKHILKPOINT2SSEET66OrIOIDCOHPOHENTDKSCRIPTIOH/FUNCTIONSECONDARYEFFECTSI2VBBUPSIAI2VBS-PNIAIOII(CONTINUED)STKhlliBYPASSAND!PRESSURE)IREGULATIOH'-.'-.:-I,PRESSURERKFKR-.,4.,~gENCE/LOADIREFERENCEHOTORIREFERENCESIGNAL)MOTORDISABLEDIREFERENCESIGNALIREHAIHSCOHSTAHT20CV1C20-CV C20-CV C20CV4-C20IV-I-C20IV C20-IV C20-IV4C20-IV-3C20-IV C20-BV-IC20-BV C20-BV C20-BV4C20-BV-S-C)SOIENOIDOPKRATING(SOLENOIDVALVESIFASTACTINGVALVESIIHOPERABLK(FORCONTROLIVALVES/INTERCEPTIVALVES/BYPASS(VALVES)LOSSOFFASTCMSURE)OFCONTROLVALVES/IHTKRCEPTVALVES(UNDERLOADREJECTIOH.)LOSSOFFASTOPENIHGIOFBYPASSVALVESIDURIHGTURBIHKTRIP.122463

APPENDIXCCONTROLSYSTEMSCOMMONONERSOURCEFAILUREANALYSESNINEMILEPOINT2SHEET47OF70COMPONENTIDCOMPONENTDESCRIPTION/FUNCTIONPRIMARYEFFECTSSECONDARYEFFECTS(2VBB-UPSlA2VBSPNLAI02C12C12-X600FORSRU2/C12-N004/C12-R600CRS(2CRS-PT103(CONTROLRODDRIVEIHATERFLOWTRANS-(MITTER/FIATCONTROLLERFOR(VALVESC12-F002A(ANDC12-F002BII(REHEATERCONTROL(INTERMEDIATESTEAM(PRESSURE(TRANSMITTERDSM(2DSM-LT75h(MOISTURESEPARATOR2DSM-LT78A(DRAINRECEIVERI2DSM-LT75BI2DSM-TK4A/(.2DSM-LT78B(2DSM-TK4BLEVELITRANSMITTERS(LOSSOFFIATSIGNAL(TOINDICATORR606ANDIPLAHTCOMPlSfER~IVALVEC12-F002AOR(C12-F002B(MHICHEVER(VALVEISIHUSE)MILL(CLOSE.IIFBACKUPPOWERFROM(2VBS-PNLB102ISALSO(LOST.(LOSSOFPRESSUREINDICATIONIHCONTROLROOMANDAHALOGINPUT(TOPLANTCOMPUTER.LOSSOFREFEREHCEISIGNALFORMODULATINGI2MSS-PV28hsI2MSSPV29hsAHD(2MSS-PV29B.IIFBACKUPPOMERFROM(2VBS-PNLB102ISALSOLOST:(LOSSOFMODULATINGISIGNALFOR2DSM-TK4A/(2DSM-TK4BNORMAL/(EMERGEHCYDRAIH(CONTROLVALVES(2DSM-LVX25A,(2DSM-LVY75A,I2DSMLVZ75ho(2DSM-LV78A/(2DSM-LVX75B,(2DSM-LVY75B,(2DSM-LVZ75B,I2DSM-LV78B.ICANNOTMOVECONTROL(RODS(SCRAM(AVAILABLE)(MAINSTEAMTO(MOISTURESEPARATORIREHEATER2MSSElhyEIBIIMODULATIHGVALVESI2MSS-PV28hoPV288eIPV29APV29BFAILCLOSED.LOSSOFMOISTURESEPARATOR(REHEATER2MSS-EIAAND(E18.UNPRESSURE(TURBINEEFFICIENCYREDUCED.I(2DSM-LVX75heLVY75heLVZ75hyLVX75B~LVY75B~(LVZ758FAlLCLOSED.I2DSMLV78AILV78B(FAILOPEN.PARTIALLOSSOiFEHNATER(HEATINGATFOURTHPOIHTHEATERS2CNM-E4A,E4B,E4C.(INCREASEIHREACTORCOREPOitERAND(MODULATIONOFCOREFIAN.INCREASED(STEAMHANTOMAIN(CONDENSER.(LOSSOF%(ISBUS(QOULDDECREASEIFEEDNATERHEATING>I(RESULTINGIHANIHSIGHIiICANT(DROPIHFEEDNATER(TEMPERATURE(ViIIl~IIl~IQiIIO12-2463

APPENDIXCCONTROLSTSTE!lSCOMMONPtNERSOURCEfhILUREANALYSESlIINEMIIEPOINT2slmET48Of10IPtSERSOURCECOIPONENTIDCOMPONENTDESCRIPTION/FUNCTIOHPRIMARYEFFECTSSECONDARTEFFECTSOTHEREFFECTSI2VBB-UPSIA2VBS-PNLA102(CONTINUED)DSRI2DSR-IT65hII2DSR-LT68AII2DSR-LT65BI2DSRLT68BIMOISTURESEPARATORREHEATKRDRAINRECEIVER2DSR-TX6A/2DSR-TX6BLEVELTRANSMITTERSMssI2Mss-PT22A/II2HSS-PT22bMOISTURESEPARATORREHEATER2MSS-Klh/2MSS-KlbSTEAMPRESSURETRANSMITTER2MSS-PT101IHIGHPRESSUREITURBINE21MS-TlIINLETHEADERPRESISURETRANSMITTERIIFBACXUPPtNERPROMI2VBS-PHLB102ISALSOILOST'IDSSOFMODULATINGISIGNALFOR2DSR-TX6A/IZDSR-TX6BNORMA!,/IEMKRGEHCYDRAINICONTROLVALVES2OSR-LVX65A,I2DSR-LVY65A)2DSR-LVZ65h)I2DSR-LV68A/I2DSR-LVX65B)I2DSR-LW65$,I2DSRLVZ65B)I2DSR-LV68BIIifBACKUPPOMKRFROMI2VBS-PLB102ISALMILOST.ILOSSOFPRESSUREIINDICATIONINCONTROLIROOMANDANALOGINPUTIToPLAHTCOMPUIKR.ILOSSOFMODULATINGISIGNALSFORI2MSS-PV28A)I2MSS-PV29A/I2MS8-PV28B,I2MSS-PV29B.IIIfBACKUPPtNKRPROMI2AS-PNLB102ISALSOILOST.IINADVERTENTLtNPRES-IsURESIGNALsTooPEHI2ASS-AOV145ANDCLOSEI2ASS-STVll2I2DSR-LVX65A)I.VY65A)LVZ65A)LVX65B)LW65B)ILVZ65BPAILCLOSED.I2DSR-LV68A)LV688IFAILOPEN.PARTIALILOSSOiFEBNATKRHKATIHGATSIXTHIPOINTHEATERSI2FMS-E6A)2FMS-E68)I2RS-K6C.INCREASEINREACTORRNKRANDIMODULATIONOFCOREIFLOW.INCREASEDISTEAMHA%ToMAINICONDENSER.III2MSSElh/2MSS-EIBIMAINSTEANVALVESI2MSSPV28A,29A/I2MSS-PV288,298FAILICLoseD.LossofIMOISTURESEPARATORIRKHEATERS.U%IPRESSURETURBINEIEFPICIEHCTREDUCED.ICLEANSTEAMREBOILER2TME-ElbANDI2TME-E1BMAINSTEAMISUPPLYISCUTOFF.ISTEAMIsEETRACTEDIPROMAUXILIARYIBOI!ER.IhIIWII~12-2463

APPENDIXCCONTROLSYSTEMSCOMMONPOMERSOURCEPAILUREANALYSESNINEMILEPOINT210-17-85SHEET49OF70PONERSOURCESYSTEHCOMPONENTIDCOMPONENTDESCRIPTION/FUNCTIONPRIMARYEFPECTSSECONDARYEFFECTSCOMBINEDEPPECTSI2VBB-UPSIAI2VBS-PNLA102(CONTINUED)(2VBB-UPS3A(FIGURE4)MSSI2MSS-PT103'IGHPRESSURE(TURBINE2TMS-Tl(PIRSTSTAGEPRES(SURETRANSMITTERMSS(2MSSPT104(HIGHPRESSUREITURBINE2TMS-TlIFIRSTSTAGEPRESISURETRANSHITTER(IFBACKUPPOMERPROMI2VBS-PHLB102ISALSOLOST:lOSSOPANALOGINPUT(TOPLANTCOMPUTER.INADVERTENTLGMPRES-(SURESIGNALMILLOPEN(DRAIHVALVESI2HSS-MOV2]hoMOV21BeMOV21CyMOV21D~(MOV147~AOV191iAOV194yAOV203y(AOV205,AOV209.IFBACKUPPOMERFROM2VBS-PHLB102ISALSO(LOST<ILOSSOFANALOGINPUT(TOPLANTCOMPUTER.(INADVERTENTLOMPRES-(SURESIGHALOPENS(DRAIHVALVES2HSS-AOV85h,AOVSSB,(AOV85C,ANDAOVS5D.IINCREASEDSTEAMPUN(TOMAIHCONDEHSER.(INCREASEDSTEAMPKOMITOMAIHCONMNSER.ILOSSOFTHISBUSANDI(ANCILLARYBUSES(2VBS*PNLA103AND(2VBAPHLA104MOULD(RESULTIHTllELOSS(OPBOTHCHCAND(CHEFLUXSIGNALS(FORRECIRC.AUTO.(FIOHCOHTROL.THISIMOULDIHCREASE(RECIRC.MOPBPIANI(ANDSCRAMTHE(REACTORONHIGH(FLUX.122463

APPENDIXCCONTROLSYSTEMSCOMMONPOMERSOURCEFAILUREANALYSESNINEMILEPOINT210-17-85SIJEET50OF70PM?RSOURCESYSTEHCOHPONEHTIDCOMPONENTDESCRIPTION/F}NCTIOHPRIMARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOMBINEDEFFECTS2VBBUPS3A2VBVPHLAI03C51BICIRCUITPS}1PS25PS26AR11(TOCOMPUTER,ITRANSIEHTTEST(PANELAHDRBMIAPRMCHACIRCUITPS31PS25PS25PS26PS27AR31C51BIAVERAGEPO}JERCHA(RAHGEDETECTORS(PROVIDIHGTRIP(OUTPUTSTOALARMS,(REACTORMANUAL(CO}fROLSYSTE}fANDIREACTORPROTECTIOHSYSTEMIIIPRMGROIJPAIINPUTSTORMHAHDIRBM.IPRMAIMANUALTRIPIINDICATORS~IIAPRMCHANNELARPSITRIPCIRCUITANDIAPRMhMANUALTRIPIINDICATORSIPS13C51BC51BPS33AIAPRMCHANNELhC51B(FMMUNITAR53(FLOMREFSIGNALIRPSTRIPCIRCUITIANDAPRMEMANUAI,TRIPINDICATORSI(AVERAGEPOWERCHE(RANGEDETECTORS(PROVIDIHGTRIPIOUTPUTSTOALARMSiC51BAPRMCHECIRCUITPS51PS26PS25PS27IREACTORMANUAL(CONTROLSYSTEMANDIREACTORPROTECTIONISYSTEMIvp+0)-IPRHGROUPAi:I',IlChL'POWERRANGE-;I'DETECTORSPROVID-(.INGANALOGIHPUTSILOSSOFPROCESSICOMPUTERANDRODIBLOCKIHPUTSITRIPSINPlJTTORPSIANDRBMIIIIIIIILOSEINPUTSTOPROCESSCOMPUTER,RMM,RBM.Jl)SEILPRMAMANllhlTRIPIINDICATIONS.I(TRIPINPlJTTORPSIClfhNNELAl.LOSEIAPRMAMANUALTRIPIHDICATIONS.IITRIPINPUTTORPSCNANNEl,hlANDA2ILOSEAPRMEMA}lUAL(TRIP1}IDICATIONSII(TRIPSINPUTTORPS(ANDRBMIIIII(PROCESSCOMPUTER/RWMIANDRBMIHITIATIOHOF(IRODBLOCK(RPSCHANNELhlTRIP(RODBLOCKRODBLOCK(RODBLOCK1/2RPSSCRAM(CllhNNELh(RPSCHANNELAlAHDA2II/2RPSSCRAMITRIPRODBLOCKICHANNELAILOSSOFTHISBUSISCRAMSREACTORAHDISTARTSECCS'SViIIn;IIIII0II12"2463

APPENDIXCCONTROLSYSTEMSCOWONRSERSOURCEFAILUREANALYSESNINEMILEPOINT2SHEET51OF70COMPONENTIDCOMPONENTDESCRIPTION/FUNCTIONPRIMARYEFFECTSSECONDARYEFFECTSI2VBBUPS3AI2VB>PNLA103(CONTINUED)N5~1!ICHLFLICITORECIRCIAUIOMATICICHCFLUXLl'IGNALSNITCHTOIIFCHCFLUXNOTIAVAILABLE'ECIRCFfAWINCREASESREACTORSCRAMONNIGIIIFLUXIFCHCNOTIAVAILABLEAPRMAIAPRMRtIPREFTRIPREFICIRCUITAIILOSEFUNREFSIGNALIRODBLOCXIYORBHCIRCUITIC12-2463

APPENDIXCCONTROLSYSTKHSCOHNONPOMERSOURCEFAILUREANALYSESNINEllILEPOINT2SHEET52Of70I2%lb-UPS3A2VBSAPNLA103II(CONTINUED)CSlbCSlhCSlbCSlb,g~>"'AI,)RPShOUTPUTSRHCShINPUTSRRCSINPUTSAPRllAAUXRELAYSCOHPONENTDESCRIPTION/FUNCTIONTRIPINPtETORPS)RODELOCEINPUI'O)RHCSI(CHANNELSTPASSlINPUTTORRCSIIlCHANNELSA,C,EIACTUATIONTOtANNUNCIATORS,IINPUTTOPROCESSICOHPUIER,CHANNELlBYPASSTORRCSPRIIIARYEFFECTSISAMEASCIRCUITRYICONTROLLINGCOILS:)ClUWNELhRPSTRIPINPUTI)RODBLOCETRIPINPUTITORMCSI)DISABLERRCSEYPASS)CHANNELSIIILOSEANNUNCIATORINPUTSCOMPUTERINPUTSDISABLE)BYPASS,INPUTTORRCSISH33SECONDARYEFFECTSIII2RPSSCRAH)CHANNELh)RODSLOCKlIIAPRHCHAlNEL(AeCeE)tTRIPINDICATIONIf)BYPASSEDIIDISABLERRCSSYPASSIOfAPRllCHANNELShs)C,EIcfIJ,iQllI122463

APPENDIXCCONTROLSYSTEMSCOHMONPOWERSOURCEFAILUREANALYSESNINEHILEPOINT210-17-85SHEET53OF70HSERSOURCESYSTEMCOMPONENTCOHPONENTDESCRIPTION/IDFUNCTIONPRIHARYEFfECTSSECONDARYEFFECTSOTHEREFfECTSCOHBINEDEFFECTSI2VBBUPS3hI2~PNLA103(CONTINUED)CKT218CAOI-,I1.2CCP+HOV265>*HOV124,*HOV17h,*HOV17B,*HOV15h,*HOV15BCLOSE.2.2IAS*SOV164,*SOV166,*SOV167,*SOV185CLOSE.3.2FP&SOV218>*SOV220CLOSE.4.2DFR+HOV120>*MOV139CLOSE.5.2CPS+AOV104,*AOV105,+AOVlll>*AOV110>*SOV120>*SOV119CLOSE.6.2LHS>>SOV152>*SOV156CLOSE.7.2DER>>HOV120>*HOV130CLOSE.8.2CHS+SOV60A>*SOV60B,*SOV62B,*SOV62ACLOSE.9.2CHS*SOV26A,*SOV26C,*SOV24A,*SOV24C,*SOV33h,*SOV34A,*SOV35hCLOSE.10.2CtlS>lP2hTRIP,I11.2RCNSOV65A>*SOV65B,*SOV66h,*SOV66B,*SOV67A*SOV68A,*SOV67B,*SAV68BCLOSEI12'HCS>>MOVIA=MOV2A,*HOV3A,*HOV4A,*HOVSANILICLOSE.CONTAINMENTISOLA-IINADVERTENTDIV.1;-TIONLOGICCKTILOCA(LEVEL2>HIGHIDRYWELLPRESSURE)ISIGNALRESULTSIN:2CC~OV265ANDI2CCWHOV124CLOSUREIMILLRESULTINLOSSOFCOOLINGMATERTOIDRYWELLUNITCOOLERS2DRSUClh>UC1B>UC1C>IUC1D~UC2h>UC2B>UC2C>IIUC2D.INABILITYTOIHAINTAINTEHPERATUREIANDHUMIDITYINIISOLATEDDRYMELLIINCREASESDRYWELLIPRESSURE.RECIRCIKATIONIRECIRC-LOOPhFIlNIVAIVE(F060A)FAILSIASISONLOSSOFISIGNAL.REACTORSYSTEMFLONCONTROLIREMAINSCONSTANT.IHIGHDRYMELLIPRESSURESCRAMSIREACTORANDSTARTSIECCS'SI

APPENDIXCCONTROLSYSTEHSCOHHONPOMERSOURCEFAILUREANALYSESNINEHILEPOIHT2SHEET54OF10POWERSOURCESYSTEHCOHPONENTIDCOHPONENTDESCRIPTION/FUNCTIONPRIHARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOMBINEDEFFECTSI2VBB-UPS3h2VBS+PNLA104C51B*-p"-J">.r<i8'~q~)4%APRH:~IAVERAGEPOWERCHCCH'C)RANGEDETECTORSCIRCUITIPROVIDIHGTRIPPS41IOUTPUTSTOALARHS,PS25lREACTORHANUAI.PS25ICONTROLSYSTEHANDPS26fREACTORPROTECTIONPS27(SYSTEHIAR41ICHCFLUX,SIGNALITORECIRCITRIPSINPUTTORPSIANDRBHIIlIIIIAUTOHATICSMITCHTOICHEFLUXIRPSCHANNELh2TRIPIRODBLOCKIIIIIIIIFCHEFLUXNOTAVAILABLE>RECIRCIFLOWINCREASESILOSSOFTHISBUSIDOESNOTAFFECTfRPVPRESSURE,)MATER'EVELORPOWERIREACTORSCRAHONHIGHIFLUXIFCHENOTIAVAILABLE12-2463

APPENDIXCCONTROLSYSTEMSCOMMONPOWERSOURCEFAILUREAHALYSESHIHEtllLEPOIHT2SHEET55OFIOPOWERSOURCESYSTEMCOMPONENTIDCOMPONENTDESCRIPTIOH/FUHCTIOHPRIMARYEFFECTSSECONDARYFFECTSOTHEREFFECTSCOtlBIHEDEFFECTSI2VBB-UPS3A)2VBAPHIA104(CONTINUED)C51B-:~.)l~,RBMIPERFORMSAHALYSISCHA)OFAVERACEFLUX,CIRCUIT)LOCALFLUX,ANDAR42)RECIRCFLOWRATEPSl)TODETERMINEIFPS25)RODBLOCKPS2BPS19)LOSEIHPUTSTORBMIRODBLOCKIIC51BC51BRBMhBYPASSFLOWUNITCPS41AR43PS43IRBMBYPASSANDAUX)RELAYSTOIIHDICATORSAHDRBMIIAPRMCHANNELCFLOWREFSICNAL)RPSTRIPCIRCUITANDAPRtlCMANUALITRIPINDICATORSLOSIRBMAUPSC~)DNSC,IHOP.IHDICA-)TIOtiSRBMTRIPINPUTI)TRIPINPUTTORPS)CHANNELA2.LOSE)APRMCMANUALTRIPIHDICATIOHS.IRODBLOCKIIIIRODBLOCK12-2463

APPENDIXCASTROLSYSTEHSNIONPStKRSOURCEFAILUREANAITSESNINEtllLEPOINT2SttKET5601VOIDCOtfPONENTDESCRIPTION/FINCTIONPRIHARYEfffCTSSECONDARYEFFECTS)2Vhh-UPSlb2VBS-PNLb101.5V;LXI02A/XI02BlIIRECIRCULATIONPUHPh/BBREAKERTEHP-KRATUREINTERLOCKRELAYLOGIC)DISABLESTHERtthL)SHOCKINTERLOCKRELAT)LOGIC.THKRHALSIIOCX)INTERIAKXRELAYS)DKENERGIZED.lI)LOSSOFDRIltKLLPRES)SUREINDICATION(N650A-IANDN650hI))INCONTROLROON.)HlGHDRYItKLLPRESSURE)TRlPUNITSN650A/IN6508DKKNKRGIZKD.))D18ABLKSVALVEIPARTIALCLOSUREONIREACTORFKKDPUHP)TIIIPSIGNALORRESETlFUNCTIONAFIER)PARTIALCLOSURERECIRCULATIONFUHtCOltTROLVALVEf060BPARTIALCLOSUREINITIATIONORRESETK616h-II)lI)E6ASBIIIIIE674B/IK680B-IIlIIRECIRCUIATIONIOOPbFUNCONTROLLERRECIRCULATIONFLOPCONTROLVALVEF0608VALVEPOSI-TIONAHPLIFIKRANDVALVEHOVKMKIITVEMCITYAHPLlfIER)DISABLESAUTOAND)HANUALFLOItCONTROLISIGttALSII)LOSSO'FAHPLIFIERlOIITPUTSIGNALII)IlN050h/N050bIDRYItELLPRESSURETlthNSHITTKR)NONE,SINCETIIERIIAL1SHOCKIIITKRLOCKSARE)USEDONLYMHILE)TRANSFERRINGTHE)PUIIPSFROttLOItSPEEDITOHIGHSPEEDIIUmUPRECIRCULAITIONFUNtCONTROl.)VAIVEF060A/F0608.)FIXEDRECIRCULATION)FLOItCO}ITROL.)NONE,UNLESSAFEED)'MATERPUHPTRIPSAND)CAUSESRPVlAAtItATER)LEVELTRIPTOlPARTIALLYCrOSSVALVEIFUNtCONTROLVALVE)f060bLOCK8UPIN)LOSS-OF81OAL)POSITIOll1)FmttCQITROLVALVE)F060bMCKSUPIttLOSS-OF-SIOALIPOSITIOII)IOSSOFTlrlSBUS)INULDCAUSEAIREACTORSCRAttON)IANIthTERLEVEL3IIFVALVEREMAINSLESS))THAN19XOPENFOR))tNRETHAN15SECONDS)THERECIRCULATION)LOOP8FllNMILL)TRANSFERTOLFHGSETIOPERATIONeREDUCING)REACTORPtWKRI)FIXEDRECIRCULATION)IOOPBCONTROL)fIXEDRECIRCULATIIN)llSPbCONTROL12-2463

APPENDIXCCONTROLSTSIEHSCOtOSNPOWERSOURCEFAILUREANALTSESNINENILEPOINT2SHEET5TOf70I2VBBUPSlb2VBS-PNLb101((CONTINUED)b35IDE635$COHPONEDESCRIPTION/FtlHCTION(FLOWBIGNAL(CONVERTERPRIHARTEFFECTS(LOSSOFCONVERTER(OUTPUTSIGNAL(FLWCONTROLVALVE(F060BLOCKSUPINILOSS-OFSIGNAL(POSITION(FIXEDRECIRCULATION(LOOPbCONTROLC12XII3-7EII3SHPUbCONTROLC12F659(FLUXESTIHATORIINPUTCIRCUITIIRECIRCUIATIONfMV(CONTROLVALVEIF060BHIDRAULICIPOWERUNITCONTROLI(RODSEt(UENCEICONTROLSYSIEN(CABINETWITHP603IRODSELECTP616(RODDRIVECONTROL(INPUTSIAUTOHATICSWITCHTOIAPRNFLUXFOLLOWINGI(RECIRCULATIONFLOW(FIXEDMOPbCONTROLICONTROLVALVEF060B(LOCKSUPINLAST(POSITIONI(LOSSOfRODBE/UENCE(RODINSERTANDWITH(CONTROLCABINET(DRAWALBLOCK~lI~lIIVl(12-2463

APPENDIXCCONTROLSYSTEHSCOHHOHPOWERSOURCEFAILUREANALYSESNINENILEPOINT2SHEET58OF70POWERSOURCE(2VBB-lJPSIBI2VBS-PNLB101((CONTINUED)8YSTEHC33COHPONENTIDK6115~"K612K613REACTORHIGHLEVELTRIP"hLOGICK624hCOHPONEHTDESCRIPTION/FUNCTIOHPOWERSUPPLIES(PROVIDEPOMERTO(THEFOLLOWING(CIRCUITSAND(DEVICES:SRU3~(SRU4IIPROVIDESHIGH(LEVEL"h"TRIPTO(RFPA,B>CAHDHAINITURBINEPRIMARYEFFECTSLOSSOFFWCONTROLIANDINDICATIONSIHIGHLEVELTRIP"h"(INITIATEDISECONDARYEFFECTSFMFLOWCONTROLVALVESF001h>B>CLOCKUPATLASTPOSIITIOH>LOSSOiCONTROL(ANDINDICATIOHII(NONE,TWOOFTHREE(HIGHLEVELTRIPSARE(REQUIREDTOTRIPRFPe(AHDHAIHTURBINEOTHEREFFECTS(LEVELINCREASETO(LEVELSRESULTINGIHIATURBINETRIP(TRANSIEHTREACTOR(SCRAHCOHBIHEDEFFECTSGAINCHANGELOGICK633(FWFLOWCONTROLLER(DOUBLEGAIHOi(GAIN'CHANGEUNIT(CONTROLLERK633(LOSECONTROLOFFMCONTROLVALVERESULT-IHGIHLOWORHIGH(WATERLEVELTRIPSETPOIHTSETDOWNLOGICH634-2CHANGESLEVELSETPOINTLOM(PROVIDESTRIPFORFEEDWATERIPARTIALCLOSUREOFIHANRECIRCIRECIRCFLOWRUNBACKICOHTROLVALVEINONE>WOULDNOTBEIABLETOSTEPDOWNIFEEDWATERLEVELCOH-ITROLSETPOIHTON(REACTORHIGHPRES-(SURE.POSSIBLEILEVEL8TRIPAFTERIHIGHPRESSURE(TRANSIENT.I(NONE>SINGLETRIPOFITMOOUTOiTWOLOGIC(REQUIREDFORVALVE(CLOSURE(WHEHCOHBIHEDMITHITHELOSSOFPOWERTOITllELEVELLOGIC(SEEBELOW)APARTIAL(CLOSUREOFTHERECIRC(FLOMCONTROLVALVES(RESULTSMITHAN(ACCOHPAHYINGREDUC(TIOHINREACTORPOWERREACTORIIHHIBITSAUTOIHONEIFSTARTUP(HIGHLEVEL(COHTROI.OiSTARTUP(VALVESiHHANUALLOGICIVALVESONHIGHICOHTROL.IFVALVEISI(LEVELIHAUTO,THEVALVEIWILLGOCLOSED.I12-2463

APPEHDIXCCOHTROLSYSTEHSCOHHOHPOWERSOURCEFAILUREAHALYSESHIHEMILEPOINT2SHEET59OF70)2VBB-UPSIB2VBS"PNLB101(CONTINUED)C33COMPONENTIDVALVE:y'gpCONTROL'""<)SIGNALFAILURE)INTERLOCKKSA,B,CK16A,B,CCOHPONEHTDESCRIPTION/FUNCTIONREHOVES4-20ahVALVECONTROLSIGHALANDLOCKSVALVESATLASTPOSITIONPRINARYEFFECTS)CONTROLSIGNALSLOSTfTOFWFLO'WCONTROLfVALVESSECONDARYEFFECTSIFMFLOMCONTROLVALVESF001A~IB~1CILOCKUPATSIGHALIFAILUREPOSITIONOTHEREFFECTSFIXEDWFLOMCONTROLCOHBINEDEFFECTSRECIRCPROVIDESPOWERANDPOWERANDLEVELTRIPIHTER-ILEVELLOGICILOCKTOTHERECIRCISYSTEII(PROVIDELEVELANDITRIPRECIRCPUHPSA,B)POWER(HPSH)TRIPTO)FROMHORHALPOWERANDIRECIRCSYSTEMITRANSFERTOLFHGIDECREASEINREACTORiPOWERAHDIHCREASEINt)LEVEL.PARTIAL1CLOSUREOFFLOMICONTROLVALVESIB33-F060hlBWHENantLEVELISCOHBIHED)WITHLOSSOFPOWERTO)ITHERECIRCRUNBACKICKT.IC)12-2463

APPa.ACCONTROLSYSTEMSCOMMOHPOWERSOURCEFAILUREANALYSESNINEMlLEPOINT2SHEET60OF70POWERSOlJRCECOMPONEHTIDCOMPONENTDESCRIPTIOH/FUHCTIONPRIMARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOMBINEDEFFECTS(2VBB-UPSlBI2VBSPHLB101(CONTINUED)CNMI2CHM-'.FT38k/~(I2CNM-.IIT3SB/.II2CNMFT3SC"CONDENSATEBOOSTERPUMP2CHM-P2A/2CHM-P2B/2CHM-P2CSUCTIONFLOWTRANSMITTER(2CNM-FT68A/(REACTORFEEDPUMP(2CHM-FT68B/(285-Plb/285-PIB/2CHM-FT68C(285PICSUCTION(FLOWTRANSMITTERIIFBACKUPPOWERFROMI2VBS"PNLA101ISALSOILOST:LOSSOiCONTROLROOMINDICATIOHOFPUMP(SUCTIOHFLOWANDIANALOGIHPIJI'OPLANTCOJJPIJTER.IHADVER-ITEllT"CONDEHSATEIBJXISTERPUMPSUCTIONIFLOWLOW"ANHUHCIA-(TIOHIHCONTROLROOM.ILOSSOiMODULATING(SIGNALFORBOOSTERIPUMPRECIRCULATIONIVALVE2CNM-FV38h/(2CHM-FV38B/(2CNM-FV38C.IIFBACKUPPOWERFROM2VBS-PNLA101ISALSO(LOST:(LOSSOFSUCTIONFLOWIHDICATIOHIHCONTROL(ROOMANDANALOGIHPUT(TOPLANTCOMPIJTER.IIHADVERTENT"REACTOR(FEEDPUMPSUCTIONIFLOWLOlPANNUHCIA-ITIOHIHCONTROLROM.ILOSSOFMODULATINGISIGNALFORFEEDPUMP(RECIRCULATIONVALVEI2FWR-FV2h/2FWR-FV2B/I2FWR-FV2C.I2CNMFV3&hiFV38ByIFV3SCFAILOPEH~IFEEDWATERFLOWTOIREACTORISREDUCED.IRECIRCIJLATIONFLOWRUNBACKAHDITIJRBIHERUHBACK.IIHCREASEINMAIHCON-IDENSERWATERLEVEL.(2FWR-FV2A,FV28,FV2C(FAILOPEH.FEEDWATERI(FLOllTOREACTORIS(REDUCED.RECIRCULA-(TIOHFLOWRUNBACKAND(TURBINERUNBACK.IHCREASEIHMAINCON-IDEHSERWATERLEVEL.12-2463

APPENDIXCCONTROLSYSTEMSCOMMONPOMERSOURCEFAILUREANALYSESNIHEMILEPOINT2SHEET61OF10PM?RSOURCESYSTEMCOMPONENTIDCOMPONENTDESCRIPTION/FUNCTIONPRIMARYEFFECTSSECOHDARYEFFECTSOTHEREFFECTSCOMBINEDEFFECTS(2VBB-UPS1B2VBS-PHLB101(CONTINUED)CNM2CNM-FT114.~'iCONDENSATEPUMP'DISCHARGEHEADERFIANTRANSMITTERNDL(2HDLLT4A/IFOURTHPOINTI2HDL-LT4B/IHEATER2CNM-E4A/I2HDL-LT4CI2CHME4B/2CNME4C(LEVELTRANSMITTER(IFBACKUPPSKRFROMI2VBS-PHLA101ISALSO(LOST.(LOSSOFDISCHARGE(FLOMIHDICATIOHIH(CONTROLROOMAHD(ANALOGINPUTTOPLANTCOMPUTER.IHADVER-(TEHT>>>>LOt>>JCONDENSATE(DISCHARGEHEADER(I'LOM"AHNUHCIATIOHIN(CONTROLROOM.LOSS(OFMODULATIHGSIGNALIFORCONDENSATEPUMP(RECIRCULATIOHVALVE(2CHM-FV114.I(IFBACKUP8%ERFROM(2VBS-PHLA101ISALSO(LOST:(LOSSOFLEVELIHDICA-ITIOHIHTHECOHTROL(ROOMANDANALOGINPUT(TOPLAHTCOMPUTER.(LOSSOFMODULATIHGISIGNALFOR2HDL-LV4A/I2HDL-LV4B/2HDL-LV4C.(2CNM-FV114FAILOPEN.(CONDENSATEFLOMIREDUCED.RECIRCULA-(TIONFlANRUNBACKAND(ITURBINERUNBACKIINCREASEIHMAIH(COHDEHSERHATERLEVEL.(IIIII2HDL-LV4A>>LV4B>>LV4C(FAILCLOSED.LOSSOF((DRAINPUMPS2HDL-Plh,IPlB,PlCDISCHARGETOI(CONDENSATESYSTEM.((TOTALFLOQTOREACTOR((REDUCED.RECIRCULA-((TIOHFLOVRUHBACKAND((TURBIHERUNBACK.IV)IIIl~,I(CIlwIl~II(oIII12-2463

APPENDIXCCONTROLSYSTEHSCOHMONPOWERSOURCEFAIIUREANALYSESNINEHILEPOINT210-17-85SHEET62OF70POWERSOURCESYSTEHCOMPONENTIDCOHPONENTDESCRIPTION/FUNCTIONPRIMARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOMBINEDEFFECTS(2VBB-UPSlB2VBS-PNLB101(CONTINUED)(2VBB-1JPS1B(2VBS-PNLB102ICRS(2CRS-PT109(IIIREHEATERCONTROLIHTERHEDIATESTEAMPRESSURETRANSHITTER'-'.:DSM(2DSM-LT75A,I2DSH-LT78A/II2DSMLT75B>>I(2DSM-LT78BIIIHOISTURESEPARATORDRAINRECEIVER2DSM<<TK4A/2DSM-TK4BLEVELTRANSMITTERSHDL(2HDL-FT35A/(>FOURTHPOINT(2HDL-FT35B/(HEATERDRAINPUMP(2HDL-FT35C(2HDL-Plb/2HDL-P1B/(2NDL-PICDISCHARGEIFLOWTRANSMITTER(IFBACKUPPOWERFROM2VBS-PNLA101ISALSOLOST:(LOSSOFDISCHARGE(FLOWINDICATIONIN(CONTROLROOH.LOSSIOFMODULATINGSIGNAL(FORRECIRCULATION(VALVE2HDL-FV35h/(2HDL-FV35B/I2HDLFV35C~(IFBACKUPPOWERFROM2VBS-PNLA102ISALSOLOST:(LOSSOiPRESSUREINDICATIONINCONTROLIROOMANDANALOGINPUT(ToPLANTCOHPUTER.ILOSSOFREFERENCE(SIGNALFORMODULATINGI2MSS-PV28h>>2MSS-PV28B2HSS-PV29A,ANDI2HSS-PV29B.IIFBACKUPPOWERFROMI2VBSPNLA102ISALSOLOST:LOSSOFMODULATING(SIGNALFOR2DSH-TK4h/2DSM-TK4BNORHAL/EHERGENCYDRAINCONTROLVALVES(2DSH-LVX75A,2DSH-LVY75A,I2DSMLVZ75A>>I2DSH-LV78A/I2DSMLVX75B>>2DSM-LVY75B,I2DSH-LVZ75B>>I2DSM-LV758I(2HDL-FV35h,FV35B,(FV35CFAILOPEN.(HEATERDRAINPUMPIDISCHARGEToCONDENSATESYSTEMWILLBEREDUCED.REACTORIHLETFLOWDECREASES(ANDTHENRETURNSTo(NORMAL.REDUCED(FEED'WATERINLETTEH-IPERATUREINCREASEINI(REACTORCOREPOWERIANDMODULATIONOF(COREFLOW.I(MAINSTEAMTO(HOISTURESEPARATOR(REHEATER2MSS-Elh,(E1BMODULATINGVALVESI2MSSPV28h>>PV28B>>PV29h,PV29BCLOSEDLOSSOiMOISTURESEPARATORREHEATER(2HSS-ElhANDElB.LOWIPRESSURETURBINE(EFFICIENCYREDUCED.II2DSMLVX75h>>LVY75h>>ILVZ75h>>LVX75B,(LVY75B,LVZ75BFAILCLOSED.2DSM-LV78h,(LV78BFAILOPEN.(PARTIALLOSSOFFEED-WATERHEATINGATFOURTHPOIHTHEATERS2CNME4A>>E4B~E4CINCREASEIHREACTOR(COREPOWERAND(MODULATIONOiCORE(FLOW.INCREASEDSTEAMFLOWTOMAINCONDENSER.>>vrr(LOSSOFTHISBUS(WOULDDECREASEFEEDWATERHEATIHG,(RESULTINGINAN(INSIGNIFICANTDROP(IINFEEDWATERI(TEMPERATURE.(12-2463

APPEHDIXCCONTROLSYSTEMSCOMMONPOINTERSOURCEFAILUREANALYSESHINEMILEPOINT2SHEET63OF10POVERSOURCESYSTEtlCOMPONENTIDCOttPONEHTDESCRIPTION/FUNCTIONPRIMARYEFFECTSSECONDARYEFFECTSOTHEREFFECTSCOMBINEDEFFECTS)2VBB-UPSlBII2VBSPNLB102(CONTINUED)l2DSRIT65A)2DSR-LT6bh/))2DSRLT65B,I2DSR-LT68BIIMOISTURESEPARATORREHEATERDRAINRECEIVER2DSR-TK6A/2DSR-TK6BLEVELTRANSMITTERSMSSI2MSS-PT22A/Il2MSS-PT22BMOISTURESEPARATORREHEATER2MSS-8IA/2MSS-ElBPRESSURETRANSMITTER2MSSPT101IHIGHPRESSUREITURBINE2Ttts-TtIINLETHEADERPRES-ISURETRANSMITTER)IFBACKUPPOttERFROMI2VBS-PHLA102ISALSOILOST:)LOSSOFMODULATING)SIGNALFOR2DAR-TK6A/I2DSR-TK6BNORMAL/lEMERGENCYDRAIN)CONTROLVALVESI2DSR-LVX65A)t2DSR-LVY65A,j2DSR-LVZ65A)I2DSR-LV68A/(2DSR-LVX65B)t2DSR-LVY65B,I2DSR-LVZ658)I2DSRLV68BIIFBACKUPPOVERFROM2VBS-PltLA102ISALSOLOST:ILOSSOiPRESSUREINDICATIONIHCONTROLIROOMANDAHALOGINPUTiTOPLANTCOMPUTER.)LOSSOFMODULATINGISIGNALSFORI2MSS-PV28A,PV29h/I2MSS-PV28B,PV29B.I)IiBACXUPPWJERFROMl2VBS-PNLA102ISALSOLOST:(IHADVERTEHTLOQPRES-)SIJRESIGNALTOOPENI2ASSAOV145ANDCLOSE2ASS-STV1122DSR-LVX65h,LVY65h,LVZ65A)LVX65B~iLVY65B)LVZ65BFAIL[CLOSED.2DSR-LV68h,ILV68BFAILOPEH~IPARTIALLOSSOFFEED)IJATERHEATINGATISIXTHPOItlTHEATERSI2FNS-E6A)E6B,E6C.INCREASEIHREACTORIPOVERAHDMODULATIONiOFCOREFIAN.INCREASEDSTEAMFlottITOMAINCONDENSER.)2MSS-Elh/2tfSS-ElBtMAINSTEAMVALVESI2MSSPV28A)PV29h/I2MSSPV28B)PV29BFAILCLOSED.LOSSOF)IMOISTURESEPARATOR(REHEATERS.UNPRES-)SURETtJRBINEIEFFICIEHCYREDUCED.ICIZANSTEAMREBOILERI2TME-ElhAHD2IME-EIB)IMAIHSTEAMSUPPLYISICUTOFF.STEAMISIEXTRACTEDFROMIAUXILIARYBOILER.IIWIII4.II12-2463

APPENDIHCCONTROLSYSTEMSCOHHOHPOVERSOURCEFhILUREANALYSESltiHEIIIIEPOINT210-31-85SHEE1'4OP10COMPONENTDESCRIPTION/FUNCTIONIPRIMARYEFFECTSSECONDARYEFFECTSItCotmINEDEFFECTSCllCICAf2I-UPSIB2VBS-PNLB)02f(COHTINUEB)lII.IIIf2VBB-UPSIB2VBSPNLB102f2VBSPNLB)o8lIIffIIf2VBB-UPS3BfFIGURE4)IIlftIIIflII2HSS-PTIO9III2MSS-PT)04fIIIIIl20FGRE13A/f2OFG-RE)3BIfHIGHPIIESSURE.fTURBINE2T)IS-T)fFIBSTSI'AGEPRESfSUBETRANRQTIKRIfHIGHPRESSURElTURBINE2THS-nIFIRSTSTAGEPRES-fSURETRANSMITTERIfIIIIfOFFGASPRETREAT-IMENTRADIhTIOHTRANSIIITIERIIIllIIIlIIfIIlIIFBACKUPPOQKRFROMf2VBS-PNLA102ISALSOfLOST)fLOSSOFANAMCINPUTfTOPIAHTCOMPUTER.fINADVERTFM'AWPRESfSURESIGNALVILLOPEIIfDRAINVALVESI2HSSMOV2)hyINV2)BIIHOV2)CIHOV21DefHOV)47~AOV19),IAOV)94'OV203>AOV205,AOV209.fLOSSOFuuumINPUTfTOPLANTCOMPUTER.INADVERTENTRODPRES-fSURESIGNALOPENSDRAIIIVALVESf2HSS-AOVBSAIAOV85B,iAOV85C,AOVSSD.fIlIfLOSSOFAHNUNCIATIONLHCONTROLRoot!QIEHIRADIATIONISHIGH.fUNABLKTOAUTOMATIC-fALLYISOLATEOFFGASISYSTEMWKHRADIATlOHIISHIGH-ltIIIffIIIfIfINCREASEDSIKAHFuvfTOIIAIHCONDENSER.fIIfIINCREASEDSTEAMFLOMITOHAINCONDENSER.IIIIfCfLOSSOFTHISlBUSDOESHOTAFIECTIfRPVPRESSURE,HATERffLBVEL,ORPONERIfIIfIIfrOSSOFTHISBUSffANDANCILLARYBUSESII2VBSllpHLB103ANDIf2~LB)04WINED]fSCRAIIREACTOROH'fHIGHDRY)tELLIfPRESSURE-IIIfI-IIIIIICDQlM00CD12-2463

APPENDIXCCONTROLSYSTEMSCOMMONPOWERSOURCEFAILUREANALYSESNINEMILEPOINT210-17-85SffEET65OF70POWERSOURCEI2VBB-UPS3B2VBS+PNLB103C51BC51BCSIBC51BC51BC51BCSIBCOMPONENTIDFLOWUNITBAR13PS14PS54APRMBTRIPREFAPRMBAUXRELAYSLRPMGROUPBPS52PS25PS26PS27AR52COMPONEllTDESCRIPTION/FUNCTIOHy~iif:~(APRMCffhNNELB(FtufREFSIGNALRPSTRIPCIRCUITLPRMGROUPF(INPUTSTORWMAHD(RBM,LPRMFIMANUALTRIPIIHDICATORS.IIAPRMCffhNNELBRPS(TRIPCIRCUITAND(APRMMANUALTRIP~INDICATORS(ILPRHGROUPBIHPUTSTORWMANDlRBM.IPRMSIMANUALTRIP(INDICATORS.((APRMTRIPREFCIRCUITB.CHANNELSB,D,FIACTUATIONTOIANNUNCIATORS>>IHPUTTOPROCESSCOMPUTER,CHANNELIBYPASSTORRCSI(LOCALPOWERRANGE(DETECTORS(PROVIDIHGANALOGIllPUTSTOCOM-IPUTER>>TRANSIENT(TESTPANEL>>AND(REMPRIMARYEFFECTS(TRIPINPUTTORPS(ClfhNNELBfLOSEIHPUTTOPROCESSCOMPUTER>>RWM>>RBM.(LOSELPRMFMANUALITRIPIHDICATIONS.II(TRIPIHPUTTORPS(CHANNELBl.LOSE(APRMBMANUALTRIPIINDICATORS.I(LOSEINPm'OPROCESSICOMPUTER>>RWM>>RBM~LOSEI.PRMBMANUALITRIPINDICATORS~Il(LOSEFLOWREFSIGNAL(TORBMCIRCUITl(LOSEANNUNCIATOR(INPUTS,COMPUTERIIHPUTS>>DISABLEBYPASS,IHPUTTORRCS(LOSSOFPROCESS(COMPUTERANDROD(BLOCKINPUTSSECONDARYEFFECTS(RODBLOCK(RODBLOCK(RODBLOCK(RODBLOCK(RODBLOCKIIIDISABLERRCSBYPASS(OFAPRMClfhNNELSB~ID>>FI(RODBLOCKCOMBINEDEFFECTS(LOSSOFTHISBUS(SCRAMSREACTORAHD((STARTSECCS.12-2463

APrEHDIICCONTROLSYSTEMSCOMMONPOIKRSOURCEFAILUREANALYSESNINEMILEPOINT2SHEET66OF70HSERSOURCESYSTEMCOMPONENTIDCOMPONENTDESCRIPTION/FUNCTIONPRIMARYEFfECTSSECONDARYEFFECTSOTHEREFFECTS(2VBB-UPS3B2V~PNLB103(CONTINUED)C51BCSlb">-"'(,wgCIRCUIT'S32PS25PS26PS27AR32APRMCHFCIRCUITPS12PS25PS26PS27AR12I(AVERAGEONERCHB((RANGEDETECTORS(PROVIDINGTRIPIOUTPUTSTOALARMS'(REACTORMANUALICONTROLSYSTEMANDIIREACTORPROTECTIONI(SYSTEMIII(AVERAGEONERCHF((RANGEDETECTORS(IPROVIDINGTRIPI(Ou?PUTSTOALARMS,((REACTORMANUAL((CONTROLSYSTEMAND((REACTORPROTECTION(ISYSTEMTRIPINPUI'ORPSAND(RPSCHANNELBlTRIPRBM(RODBLOCKIIIIIIITRIPINPUTTORPSANDIRPSCHANNELSBlANDRBH(B2TRIPRODBLOCK1/2RPSSCRAMCHAHHELBIl~II(00I'v122463

APPENDIXCCONTROLSYSTEHSCOMMONPSKRSOURCEFAILUREAHALYSESNINEMILEPOINT2SHEET67OFIOPOHERSOURCE(2VBB-UPS3B2VBS>PHLB103(CONTINUED)CSIBCSIBCOMPONENTIDRBMbBYPASSRPSBOUTPllTSRMCSIHPUTSRRCSBINPUTSCOMPOHEHTDESCRIPTION/FUNCTION(RBMBYPASSANDAUX(RELAYSTO(INDICATORSANDRBMI(TRIPINPUTTORPS(I(RODBLOCKINPUTTO(RMCSI(CHANNELBYPASS(IHPUTTOBRCSPRIMARYEFfECTS(LOSERBMUPSC,DHSC>INOPIHDICATIONSRBM(TRIPUNITI(SAMEASCIRCUITRY(CONTROLLIHGCOILS:I(RODBLOCKTRIPTO(RllCSI(DISABLERRCSBYPASS(Cl?AHNELSB,DiFAPRMSECONDARYEFFECTS(RODBLOCKI/2RPSSCRAM(CHANNELBI(RODBLOCKOTHEREFFECTSCOMBINEDEFFECTSI2-2463

APPEJIDIXC.CONTROLSYSIE)fSCOHNONPOVERSOURCEFAILUREANALYSESHIRENILEPOINT210-31-85SHEET68OF70I.IPOVERSOURCEla2VBBUPS38)2VB~)03III12-2463CONPONEÃICufPOHEHTIDESCRIPTIOHIIDFUNCTION~>>~.a.-~~ilfCKY2ISCEOII.-.)'OHTAIHNEHTISOLA-'"ILATIONIOGICCXTIIIIIIIIIIIIIIIIPRIHARYEFFECTS)INADVERTENTDIV.IIiLOCA(LEVEL2,HIGH/DRYVELLPRESSURE)tSIGNALRESULTS1H:Il.2CCPMOV273>>I~OV122-HOV94Al&OV94B>>~VI6A>>+NOV)68CIOSE.2.2I~SOV)65>>WOV)68>>+SOV180>>~V)84CLOSE.3.2F~)9>>+SOV221CMSE.4.2D~V)2),~40CLOSE.5~2CP&AOV)06>>+AOV)08>>+AOV)07'OY)22,AOV109,CIOSE.6.2~153>>WOV157CLOSE.7.20~VI)9>>*HOV131CIOSE.8.2~V6)A>>*SOV618,~V63h>>MOV63BCIOSE.9.2~SOV26B>>*SOV26D,~V248>>*SOV24D,-SOV338,~V34B>>~V358CLOSE.i10.2CNS+P28TRIP.11.2RCS+SOV79A>~V79B>>+SOV80A>>~VBOB,+SOV81A,*SOVB)B,-SOV82A>>~V82BCLOSE.I12'H~OV)B>>~V28>>~V38>>~Y48>>WOVSB>>VILLCLOSE.IIIIIISECONDARYEFFECTSRECIRC.LOOP8FllNIRENAIIISCONSTANT.2~V273ANDI2CC~V)22CIOSURE(VILLRESULTIHLOSS)OFCOOLIHGHATERTO)DRYVELLUNITCOOLERSI2DRSIJC)A>>UC)B>>UClC>>iUClD>>IJ2A>>UC2B>>UC2C>>IUC2D.INABILITYTO)NAIHTAINTEHPERATURE)ANDJIUNIDITYIHISOIATEDDRYVELL)INCREASESDRYWELL)PRESSURE.IIIlIIIjfIIIIII1tIIIREACVORRECIRCULATIONISYSTENFMVCONTROLVALVE(F060B)FAILSIASISOHJOSSOFSIGNAL.IIIlIIIIII"I1llIIIttIIIIIIIII.IIIIIIIIIIIIIIIIItIHIGHDRYVHLKPRESSURESCRANSIREACTORhiNDSTARTSIfECCS'S.II~+>>>>ff

APPENDIXCCONTROLSYSTEMSCOMMONPOWERSOURCEFAILUREAHALYSESNIHEMILEPOINT2SHEET69OF70POWERSOt1RCESYSTEMCOMPONEHTIDCOMPONEHTDESCRIPTION/FUNCTIOHPRIMARYEFFECTSSECONDARYEFFECTSCOMBINEDEFFECTS)2VBB-UPS3B2VBS*PNLB104CSIBCSIBAPRM'HDCIRCUITPS22PS25PS26PS27AR22RBMCMBCIRCUITPS23AR21I)AVERAGEPOWERCHD)RANGEDETECTORSIPROVIDINGTRIPIOUTPUTSTOALARMS,IREACTORMANUALICONTROLSYSTEMANDIREACTORPROTECTION)SYSTEMIIPERFORMSANALYSISIOFAVERAGEFLUXs)LOCALFLUX,AHD(RECIRCRATEFLOWlTODETERMINEIF)RODBLOCKIlIIIII)LOSEINPUTSTORBMRODBLOCKITRIPINPUTTORPSAHDIRPSCHANNELB2TRIP)RBMIRODBLOCKILOSSOFTHISBUSfDOESHOTAFFECTIRPVPRESSUREsIWATERLEVEL,ORiPOWER12-2463

I'IIII'I'I'II'IIIII'I'tIII:IIIIII

07g29gqgPNINEH~lEPOINTUNI~ZNRCCORRESPONDENCEAPPROVAL

SUBJECT:

IDUEDATE:PREPAREDBY:REFERENCE(S):QPURPOSE:W(/gynicg~z6f)Z2wIhavereviewedtheattacheddocuments.Tothebestofmyknowledge,thedocumentsarecompleteandaddressthesubject.SyracuseReviewN.L.RademacherSiteReviewB.R.Horrison-gASiteContact(s)-Qa~~gC4M~w,FinalReviewA.F.ZallnickG.D.WilsonCompliance8VerificationC.V.Mi!i'-ANweErst!~Om,~>+~<'(>I/F<D.Hill,ORIGINALwiththree(3)copiesri/i~fW5/85

NTNIAGARAVMOHAWKNIAGARAMOHAWKPOWERCORPORATION/300ERIEBOULEVARDWEST,SYRACUSE,N.Y.13202/TELEPHONE(315)474-1511Re:NineMilePointUnit2OocketNo.50-410g/'.HalterButler,ChiefLicensingBranchNo.2U.S.NuclearRegulatoryCommissionWashington,O.C.20555Oear.Butler:~(Enclosedforyourusearetencopiesofthecommonsensorandcommonpowersupplyfailureanalysisreports.ThisinformationissuppliedtocloseoutSafetyEvaluationReportconfirmatoryitems24and26.BasedupontheevaluationnofailureswereidentifiedwhichwouldexceedtheconsequencesoftheFinalSafetyAnalysisReportChapter15analysis.Verytrulyyours,gJpi<.w1CVM/NLR/ddEnclosures0960Gxc:R.A.GramII,NRCResidentInspectorProjectFile(2)T.E.LempgesVicePresidentNuclearGenerationl~~fca~~(j-hJ,E,I-e~pe~<~~~p$an<~'i'rhQ,ik01~~~~<

TNIAGARAUMOHAWK729Lj992NIAGARAMOHAWKPOWERCORPORATION/300ERIEBOULEVARDWEST,SYRACUSE,N,Y.13202/TELEPHONE(315)474~1511Mr.WalterButler,ChiefLicensingBranchNo.2U.S.NuclearRegulatoryCommissionWashington,D.C.20555

DearMr.Butler:

Re:NineMilePointUnit2DocketNo.50-410Enclosedforyourusearetencopiesofthecommonsensorandcommonpowersupplyfailureanalysisreports.ThisinformationissuppliedtocloseoutSafetyEvaluationReportconfirmatoryitems24and26.BasedupontheevaluationnofailureswereidentifiedwhichwouldexceedtheconsequencesoftheFinalSafetyAnalysisReportChapter15analysis.Verytrulyyours,T.E.LempgesVicePresidentNuclearGenerationCVM/NLR/dd~-Enclosures,;,0960Gxc:R.A.Gramn,NRCResidentInspectorProjectFile(2)

9099Mr.WalterButler,ChiefLicensingBranchNo.2U.S.NuclearRegulatoryCommissionWashington,D.C.20555

DearMr.Butler:

Re:NineMilePointUnit2DocketNo.50-410EnclosedforyourusearetencopiesofthecommonsensorandcommonpowersupplyfailureanalysisreportoThisinformationissuppliedtocloseout~Q,4rSafetyEvaluationReportconfirmatoryitem24.TGastpwgcvd~~a~~+4~nOg(~~~g~g;~R~+VeryCrfyyoursurCVM/NLR/dd,~Enclosures-";;;.0960Gxc:R.A.Gramm,NRCResidentInspectorProjectFile(2),SeniV.Mangansiden<,E,~yy~+Yi~~P~~x~o~~r+~~/~~JPZIQXun

Mr.WalterButler,ChiefLicensingBranchNo.2U.S.NuclearRegulatoryCommissionWashington,O.C.20555OearMr.Butler:Re:NineMilePointUnit2OocketNo.50-410Enclosedforyourusearetencopiesofthecommonsensorandcommonpowersupplyfailureanalysisreports.ThisinformationissuppliedtocloseoutSafetyEvaluationReportconfirmatoryitems24and26.BasedupontheevaluationnofailureswereidentifiedwhichwouldexceedtheconsequencesoftheFinalSafetyAnalysisReportChapter15analysis.Verytrulyyours,CVM/NLR/ddEnclosures0960Gxc:R.A.Gramm,NRCResidentInspectorProjectFile(2)T.E.LempgesVicePresidentNuclearGeneration

GENERALELECTRICNUCLEARENERGYBUSINESSOPERATIONSGENERALELECTRICCOMPANY~175CURTNERAVENUE~SANJOSE,CAUFORNIA95125MC389,(408)925-3798bcc:August26,1985Respondsto:ResponseRequiredby:BIP:NMP2-114JO¹12177H.H.R.M.J.R.L.S.D.E.P.C.File:EngelkingPulsiferRoblesRichardsonBennettYinKG220Mr.D.L.QuammeProjectDirectorNineMilePoint-Unit2P.O.Box63Lycoming,NY13093Attention:D.L.QuammeGentlemen:

SUBJECT:

NSSSCONTRACTNO.PC-NMP2"1FINALREPORTSFORCONTROLSYSTEMSCOMMONPOWERANDCOMMONSENSORFAILURESEVALUATION-QUOTENO.264NINEMILEPOINTNUCLEARSTATION-UNIT2NIAGARAMOHAWKPOWERCORPORATIONAttachedarethefollowingtworeportswhichdocumentworkperformedbyGeneralElectricunderQuoteNo.264.ThereportsincorporateinputfromStone8WebsterandhavebeenreviewedwithStone8WebsterandNiagaraMohawk.ControlSystemsCommonPowerFailuresEvaluationReport,June1985,preparedbyC.F.Jarvis.ControlSystemsCommonSensorLineFailureAnalysisEvaluationReport,July1985,,preparedbyD.E.Bennett.Basedonthe,"".e'valuationofthecontrolsystemscommonpowerfailuresandcommonsensorfailur'es,",nofailureswereidentifiedwhichwouldexceedtheconsequencesoftheFSARChapter15analyses.:Verytrulyyours,ProjectManagerNineMilePoint2HRP:br:rm/N08232cc:R.J~HallA.W.Latti,w/att.D.L.PikeJ.P.Thomas,w/att.K.VaradarajanC.C.Zappile

07529009bGENERALeELECTRICNUCLEARENERGYBUSINESSOPERATIONSERALELECtRICCOMPANY~175CURTNERAVENUE~SANJOSE,CAUFORNIA95125MC389$(408925-3798October18,1985Respondsto:N/AResponseRequiredby:N/ANMP2165JOIjI12177Mr.D.L.QuammeProjectDirectorNineMilePoint-Unit2P.0.Box63Lycoming,NY13093

DearMr.Quamme:

RECEIVEDNineMilePt.2Projectocr2>~BS5Syracuse-Headquarters

SUBJECT:

NSSSCONTRACTNO.PC-NMP2-1REPORTFORCONTROLSYSTEMSCOMMONPOWERFAILURESEVALUATION-QUOTENO.264NINEMILEPOINTNUCLEARSTATION-UNIT2NIAGARAMOHAWKPOWERCORPORATIONAttachedarethefollowingreplacementpagestothesubjectreportwhichincorporatecommentsprovidedbyStone&Webster(RaviPanicker).Pages9,15,19,20,21,21A,B-12,C-6,C-17,C-49,C-50,C-53,C-62,C-64,C-65andC-68alldated10-17-85.ItisGeneralElectric'sunderstandingthattheControlSystem'sCommonPowerFailuresreportwiththeattachedreplacementpagesandtheControlSystem'sCommonSensorFailuresreport,eachofwhichweretransmittedbyGeneralElectriconAugust26,1985,arenowreadyfortransmittaltoNRC.However,itisrequestedthatStone&WebsterprovidewrittenconfirmationtothateffectandthatNiagaraMohawknotsendthesereportstoNRCuntilStone&Websterconcurrenceisreceived.Verytruly-.:yours,~~~.Peffer"ProjectManagerNineMilePoint2HRP:pes/105NAttachmentscc:R.J.HallA.W.Lattiw/attdlmR8dEEMChe~/eCt~D.L.PikeJ.P.ThomasK.VaradarajanC.C.Zappile

v4551075290V97le~51.198512(55P~2GENERALOELECTRICNUCLEARPOWERSYSTEMSDIVISIONGENERALELECTRICCOMPANY~175CURTNERAVENUE~SANJOSE,CALIFORNIA9S1RSOctober31,1985Respondsto:NAResponseRequiredby:NMP2-171Mr.D.L.QuammeProjectDirectorNineMilePoint-Unit2P.O.Box63Lycoming>NY13093

DearMr.QuammelSUBJECT:

NSSSCONTRACTNO.PC-NMP2-1REPORTFORCONTROLSYSTEMSCOMMONPOWERFAILURESEVALUATIONQUOTENO,264NINEMILEPOINTNUCLEARSTATION-UNIT2NIAGARAM01QWKPOWERCORPORATIONThefollowingreplacementpagesneedtobeinsertedintheControlSystemsCommonPowerFailuresreportwhichwastransmittedbyGeneralElectricletter%1P2-114onAugust26'985:Pages9tlS1921'1AB12pC6)C49C50yC53yC62andC-65dated10-11-85andpages20>C-17,C-64,andC-68dated10-31-85.TheabovehasalsobeenreviewedandconcurredtobyStone&Webster.Thelatestchangestopages20andC-17aregiveninStone&Websterletter9M2-18>363datedOctober31,1985andthechangestopagesC-64andC-68areminortyposreceivedfromMr.R.Panicker,NochangesareneededtotheControlSystemsCommonSensorreportwhichwasalsotransmittedbyGeneralElectricletterNMP2-114.Theabovereplacementpagesareattached.Very;trulyyours,H.R.PefferProjectManagerNineMilePoint2Attachmentscc:R.J,HallA.W.Lattiw/att.N.RadQmacherw/att.D.L.PikeK.VaradarajanC.C,Zappile

0752909984.2TheadditionalsinglefailureanalysisresultswereevaluatedandcomparedwiththeFSARChapter15analyses.Nosinglecompletelyboundingfailurewasidentified.Thepostulateddoublefailure,i.e.,lin>>failureanddevicefailureoccurrence,similartootherselectedhighlyunlikelydoublefailureoccurrences,wasnotspecificallyaddressedinChapter'15.4.3WhiletheNMP2FSARChapter15didnotdirectlyaddresstheabovedescribedpostulatedfailureevent,theresponsestoNRC'spreviousNMP2FSARQuestion4p],p]andtheRP2SafetyEvaluation(SER)Section7.2.2.7dosatisfactorilyaddresssimilarevents.12-25346 ~01)l.1k4;I) }}

ML18038A079

Contents

Text

2.0CONCLUSION

SUBJECT:

DearMr.Butler:

DearMr.Butler:

SUBJECT:

DearMr.Quamme:

SUBJECT:

DearMr.QuammelSUBJECT:

Navigation menu

ML18038A079

Text

2.0CONCLUSION

SUBJECT:

DearMr.Butler:

DearMr.Butler:

SUBJECT:

DearMr.Quamme:

SUBJECT:

DearMr.QuammelSUBJECT:

Navigation menu

Search