Title of article
FiniteelementanalysisforcreepfailureofcoolantpipeinlightwaterreactorduetolocalheatingundersevereaccidentconditionOriginalResearchArticle
Author/Authors
SeiyaHagihara، نويسنده , , NoriyukiMiyazaki، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2008
Pages
8
From page
33
To page
40
Abstract
Duringsevereaccidentofalightwaterreactor(LWR),thepipingofthereactorcoolingsystemwouldbedamagedwhenthepipingissubjectedtohighinternalpressureandveryhightemperature,resultedfromhightemperaturegasgeneratedinareactorcoreanddecayheatreleasedfromthedepositoffissionproducts.Itisconsideredthat,undersuchacondition,short-termcreepathightemperatureswouldcausethepipingfailure.Fortheevaluationofpipingintegrityunderasevereaccident,amethodtopredictsuchhightemperatureshort-termcreepdeformationshouldbedeveloped,usingacreepconstitutiveequationconsideringtertiarycreep.Inthispaper,thecreepconstitutiveequationincludingtertiarycreepwasappliedtonuclear-gradecold-drawnpipeof316stainlesssteel(SUS316),basedontheisotropicdamagemechanicsproposedbyKachanovandRavotnov.TensilecreeptestdataforthematerialofaSUS316cold-drawnpipewereusedtodeterminethecoefficientsofthecreepconstitutiveequation.Usingtheconstitutiveequationtakingaccountofcreepdamage,finiteelementanalyseswereperformedforthelocalcreepdeformationofthecoolantpipingundertwotypesofconditions;uniformtemperature(isothermalcondition)andtemperaturegradientofcircumferentialdirection(non-isothermalcondition).TheanalyticalresultsshowthatthedamagevariableintegratedintothecreepconstitutiveequationcanpredictthepipefailureinthetestperformedbyJapanAtomicEnergyResearchInstitute,inwhichfailureoccurredfromtheoutsideofthepipewall.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2008
Journal title
Nuclear Engineering and Design Eslah
Record number
894976
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