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AP1000核电站额定功率运行时单台给水泵跳闸瞬态分析 Introduction TheAP1000nuclearpowerstationisaGenerationIII+pressurizedwaterreactordesigndevelopedbyWestinghouseElectricCompany.TheAP1000hasaratedthermalpowerof3400MWthandanelectricaloutputof1117MWe,whichisgeneratedbytwosteamturbinegenerators.TheAP1000employsapassivesafetysystemthatutilizesnaturalforces,suchasgravityandnaturalcirculation,toshutdownthereactorintheeventofanemergency.Oneofthekeycomponentsofthesafetysystemisthefeedwatersystem,whichprovideswatertothesteamgeneratorstoproducesteamforelectricitygeneration.Inthispaper,wewillanalyzethetransientbehaviorofasinglefeedwaterpumptripduringratedpoweroperationoftheAP1000nuclearpowerstation. TheFeedwaterSystem ThefeedwatersystemisacriticalcomponentoftheAP1000safetysystem.Itprovideswatertothesteamgeneratorstoremoveheatfromthereactorcoreandgenerateelectricity.Thefeedwatersystemconsistsoffourfeedwaterpumps,twopersteamgenerator,whicharepoweredbyelectricmotors.Thefeedwaterpumpsarelocatedinthepumproom,whichisadjacenttothereactorcontainmentbuilding.Thepumpstakesuctionfromthecondensatestoragetankanddischargetothesteamgenerators. TransientAnalysis ThetransientanalysisofasinglefeedwaterpumptripduringratedpoweroperationoftheAP1000involvesanumberofsteps: Step1:Identifytheinitialsteadystateconditionsofthepowerplant Atratedpoweroperation,thereactorandsteamgeneratorpressuresaremaintainedat2250psiand1000psi,respectively.Thefeedwaterflowrateisapproximately1200gpmandthefeedwatertemperatureis546°F.Thepoweroutputoftheelectricalgeneratorsis1117MWe. Step2:Tripasinglefeedwaterpump Assumingasinglefeedwaterpumphastripped,thefeedwatersystemflowratewilldecreasebyapproximately600gpm.Thefeedwatertemperatureandpressureatthesteamgeneratorinletwilldecreaseslightlyduetothereducedflowrate.Thesteamgeneratorpressurewillstarttodecreaseduetothereducedheatremovalfromthereactorcore. Step3:Initiatetheautomaticresponseofthesafetysystem TheAP1000safetysystemisdesignedtorespondautomaticallytoafeedwaterpumptripevent.Assoonasthetripisdet