Title of article
EstimationofgraphitedensityandmechanicalstrengthvariationofVHTRduringair-ingressaccidentOriginalResearchArticle
Author/Authors
EungSooKim، نويسنده , , HeeCheonNO، نويسنده , , ByungJoonKim، نويسنده , , ChangH.Oh، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2008
Pages
11
From page
837
To page
847
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
Serial Year
2008
Journal title
Nuclear Engineering and Design Eslah
Record number
895049
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