Author/Authors :
YuMaruyama، نويسنده , , YoshihiroKojima، نويسنده , , MikaTahara، نويسنده , , HideoNagasaka، نويسنده , , MasamiKato، نويسنده , , AlexanderA.Kolodeshnikov، نويسنده , , VladimirS.Zhdanov، نويسنده , , YuriS.Vassiliev، نويسنده ,
Abstract :
AseriesofMCCItestswasperformedinCOTELSprojectatNUPECtoexamineconcretedegradationcharacteristicsduringMCCIwithandwithoutwateradditionontothedebris.MoltenstainlesssteeloramixturecomposedofUO2,ZrO2,Zrandstainlesssteelwasslumpedintoatwo-dimensionalconcretetrap,wherevolumetricdecayheatgenerationwassimulatedbyaninductionheatingtechnique.TheresultsofdryMCCItestsimpliedthatconcreteablationwasdominatedbymeltingofaggregateswhenthedebriswascrustedandcementwasthermallyweakerthanaggregates.Withoutpresenceofstablecrust,unmoltenaggregateswerepossibletorelocateupwardduetothedensitydifferencefromthedebris.Concreteresponsesunderawetconditionshowedatendencythatwatermigratedintothermallydegradedconcrete.ApreliminarywatermigrationmodelwasincorporatedintoCOCOcodefortransientheatconduction.ThepredictionbyCOCOcodeagreedwiththetendencyofconcretethermalresponsesobservedinthedryandwetMCCItests.
