Title of article :
EstimationofgraphitedensityandmechanicalstrengthvariationofVHTRduringair-ingressaccidentOriginalResearchArticle
Author/Authors :
EungSooKim، نويسنده , , HeeCheonNO، نويسنده , , ByungJoonKim، نويسنده , , ChangH.Oh، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Abstract :
ThisstudyfocusesonpredictingthechangesingraphitedensityandmechanicalstrengthinVHTRduringtheair-ingressaccidentviathermalhydraulicsystemanalysiscode.Asimplegraphiteburn-offmodelwasdevelopedbasedonthesimilaritiesbetweenaparallelelectricalcircuitandgraphiteoxidation.ThedevelopedmodelalongwithothercomprehensivegraphiteoxidationmodelswereintegratedintotheVHTRsystemanalysiscode,GAMMA.GT-MHR600MWtreactorwasselectedasareferencereactor.Basedonthecalculation,themainoxidationprocesswasobserved5.5daysaftertheaccidentwhenfollowedbynaturalconvection.Thecoremaximumtemperaturereached1430°C,butneverexceededthemaximumtemperaturecriteria,1600°C.However,theoxidationprocessdidsignificantlydecreasethedensityofbottomreflector,makingitvulnerabletomechanicalstress.Thestressonthebottomreflectorisgreatlyincreasedbecauseofthereductionofloadedsurfaceareawithgraphiteoxidation.Thecalculationproceededuntil11daysaftertheaccident,resultinginanobserved4.5%decreaseindensityanda25%reductionofmechanicalstrength.
Journal title :
Nuclear Engineering and Design Eslah
Journal title :
Nuclear Engineering and Design Eslah
