IAEA-stress test methodology for NPPs in the wake of the fukushima accident

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1、STRESSTESTMETHODOLOGYFORNUCLEARPOWERPLANTSINTHEWAKEOFTHEFUKUSHIMAACCIDENTFrankNuzzoIAEANuclearPowerEngineeringf.nuzzo@iaea.orgENSREGHighLevelRequirementsFollowingtheextremeeventsinFukushima,mostcountriesareconductingasafetyreviewoftherobustnessoftheirNPPsTheUS,Russia,China,Korea,Japanhaveunderta

2、kenrigorousreviewsInternational/Nationalorganizations(IAEA,WANO,INPO)arepreparingorhaveissuedguidelinesandspecificationstodealwithextremeeventsInEuropetheEuropeanNuclearSafetyRegulatorsGroup(ENSREG)haveissuedaspecificationforastresstestoftheirfacilities”TheEuropeanDeclarationonthepost-Fukushimas

3、tresstest”FrankNuzzo-IAEA-NPNE10/20/20112Exampleofan“extremeevent”Initiatingevent:Anunforeseeninitiatingexternaleventsuchasanearthquakeofamagnitudelargerthantheplantdesignandlicensingbasis,inducingthedestructionofallinfrastructurearoundtheplantandthecollapseofadamupstreamoftheNPPwhichfloodsthereg

4、ionanddefactoisolatestheNPP.Consequencesontheplant:TheNPPmayexperiencethisexternaleventasbothabeyonddesignbasisearthquakecombinedwithafloodexceedingthedesignbasisflood,whichtogethermayinducecliff-edgeeffects(sub-events)suchas:ProlongedlossofAC=prolongedStationBlackOut(SBO)orProlongedlossofUHSor

5、ProlongedlossofbothservicesextendingwellbeyondthemissiontimeofthesafetybatteriesandofallFW&reservewaterinventoriesFrankNuzzo-IAEA-NPNE10/20/20113Japan’sstresstest&safetyreviewJapanisconductingimpactanalysesofvariousearthquakes/tsunamicombinationswithprolongedSBO+lossofUHSasaresult.Themethodinvolv

6、es3steps:1.Identificationofcomponentssusceptibletodamageforimpactsexceedingdesignbasis2.Identificationofaccidentsequencesforhazards/magnitudesexceedingdesignbasis,assuminglossofsafetyfunctionsandofcliff-edgeeffectsinducinglossofcomponentsneededtomitigatetheaccident.3.Identificationofmeasurestoprev

7、entfueldamage(hardwareandSevereAccidentManagementGuidelines[SAMG]).FrankNuzzo-IAEA-NPNE10/20/20114ResponsetoFukushimaintheUSTheUSNRCsetupaFukushimaNear-TermTaskForce(NTTF)whichrecommended:ActionsidentifiedinSEC