Westinghouse AP1000 nuclear power plant

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1、WestinghouseNon-ProprietaryClass3April2011WestinghouseAP1000®NuclearPowerPlantCopingwithStationBlackoutWestinghouseNon-ProprietaryClass3April2011WestinghouseAP1000®NuclearPowerPlantCopingwithStationBlackoutAP1000®isaregisteredtrademarkintheUnitedStatesofWestinghouseElectricCompanyLLC,itssubsidi

2、ariesand/oritsaffiliates.Thismarkmayalsobeusedand/orregisteredinothercountriesthroughouttheworld.Allrightsreserved.Unauthorizeduseisstrictlyprohibited.Othernamesmaybetrademarksoftheirrespectiveowners.WestinghouseElectricCompanyLLCP.O.Box355Pittsburgh,PA15230-0355©2011WestinghouseElectricCompany

3、LLCAllRightsReservedWESTINGHOUSENON‐PROPRIETARYCLASS3AP1000®NuclearPowerPlantCopingwithStationBlackoutStationBlackout:(per10CFR50.2)“Thecompletelossofalternatingcurrent(AC)electricpowertotheessentialandnonessentialswitchgearbusesinanuclearpowerplant(i.e.,lossofoffsiteelectricpowersystemconcurre

4、ntwithturbinetripandunavailabilityoftheonsiteemergencyACpowersystem).StationblackoutdoesnotincludethelossofavailableACpowertobusesfedbystationbatteriesthroughinvertersorbyalternateACsourcesasdefinedinthissection,nordoesitassumeaconcurrentsinglefailureordesignbasisaccident….”Section1:Initiationo

5、fNaturalCirculation&DecayHeatRemovalTheFirst72HoursStationBlackout(SBO)resultsinanimmediatereactortripwithcontrolrodsbeinginsertedbywayofgravityuponlossofpower.Thisactionimmediatelyshutsdownthenuclearreactor.Eventhoughthereactorisshutdown,itwillcontinuetoproduceheatonadecayingbasisfromthefuel

6、inthereactorcore.This“decayheat”mustberemovedfromthereactorcorecontinuously(Figure1).ReactorDecayHeatGeneration765Power)~1%after2HoursFull472Hours(%37DaysHeat2Decay1030180072004320086400129600172800216000259200302400345600388800432000475200518400561600604800TimeAfterTrip(seconds)Figure1:AP1000D

7、ecayHeatCurve0‐7DaysNPP_NPP_000065Page1of9WESTINGHOUSENON‐PROPRIETARYCLASS3oSixbanksofsafety-related(Class1E)lead-acidbatteriesautomaticallypowervitalDCloadsaswellassupplyUninterruptablePowerSupplies(UPS)whichpowervitalACloads.Fou