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1、Availableonlineatwww.sciencedirect.comNuclearEngineeringandDesign238(2008)15921600BehaviorofunirradiatedZrbaseduraniummetalfuelunderreactivityinitiatedaccidentconditionsYang-HyunKooa,∗,Chong-TakLeea,Je-YongOha,Dong-SeongSohna,M.Baryshnikovb,A.Chechurovb,B.MargulisbaKoreaAtomicEnergyResearchInstitute
2、,FutureFuelDevelopment,P.O.Box105,Yuseong,Daejeon305-600,SouthKoreabRussianResearchCenter,KurchatovInstitute,InstituteofReactorMaterialsResearchandRadiationNanotechnologies,KurchatovSquare1,Moscow123182,RussiaReceived4July2007;receivedinrevisedform5October2007;accepted5November2007AbstractReactivity
3、initiatedaccident(RIA)testswith4unirradiatedZrbaseduraniummetalfuelrodswereperformedtoestablishacriterionwhichshouldbeobservedunderRIAconditions.Ofthefourtests,fuelfailureswereobservedinthetwoteststhatexperiencedthemaximumenergydepositionsof188and212cal/g,respectively.However,thefuelfailureswerenoto
4、bservedattheplaceofamaximumenergydepositionbutatthepositionwherethethermocoupleswereinstalled;onefailedatthepositionwhoselocalenergydepositionwas150cal/g,andtheotheroneattheplacewithenergydepositionof170cal/g.Thefuelfailuresseemtohaveoccurredbecauseexcessivepressure,whichwascausedbythepartialmelting
5、ofthefuelmeat,wasappliedtothecladdingwithareducedthickness.However,otherpartsofthefuelrodsincludingtheplaceofamaximumenergydepositionmaintainedtheirintegrityandabigchangeinthetemperatureandpressureintheinternalcapsule,whichwouldbeanindicationofthefragmentationanddispersionofthefuelmeatintotheinterna
6、lcapsule,wasnotobserved.Visualinspectionalsoshowedthat,exceptforthethermocouplepositions,therewasnotraceofcladfailuresuchastheformationofbrittlecracksinthecladdingormeltingofthecladding.Therefore,fortheZrbaseduraniummetalfuelrods,itcanbeconcludedthatthethresholdenergydepositionabovewhichfragmentatio
7、nanddispersionoffuelmeatintotheprimarycoolantsystemisexpectedtooccurcouldbehigherthan212cal/g.©2007ElsevierB.V.Allrightsreserved.1.Introductionthefuelassemblygeometryofthefuelandtoproducepres-surepuls
