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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
