Title of article
AnalyticalstudyoneliminationofsevererecriticalitiesinlargescaleLMFBRSwithenhancementoffueldischargeOriginalResearchArticle
Author/Authors
YoshiharuTobita، نويسنده , , HidemasaYamano، نويسنده , , IkkenSato، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2008
Pages
9
From page
57
To page
65
Abstract
Thepossibilityofsevererecriticalitycouldbeexcludedifthemoltencorematerialsaredischargedfromreactorcoreintheearlystageofcoredisruptiveaccident(CDA).Basedonthisidea,severaldesignmeasuresforfuturecommercialliquidmetal-cooledfastbreederreactors(LMFBRs)havebeenproposedtoenhancethemoltenfueldischargefromcoreinordertopreventformationofthecore-widemoltenpoolwithhighmobility.Onepromisingconceptinthesedesigncandidatesismodified-FAIDUS(FuelsubassemblywithInnerDUctStructure).Theeventprogressioninunprotectedlossofflow(ULOF)accidentinasodium-cooledlargescaleFBRwithmodified-FAIDUSwasanalyzedtoassesstheeffectualperformanceofmodified-FAIDUSinpreventingsevererecriticalityusingtheSAS4AandSIMMER-IIIcodes.Twoparametriccaseswereperformedcoveringtheuncertaintyofductwallfailuremechanism,onewithstablefuelcrustandanotherwithunstablecrustcondition.Thecalculationshowedthatthefinalamountofdischargedfuelfromcoreinbothcaseswasmorethan20%ofinitialcoreinventory.Thedegradedcoreafterfueldischargeiscomposedofthemixtureofsolidifiedfuel,swollenfuelchunksandmoltensteel,ofwhichlowmobilitypreventsmassivefuelmotion.Thereactorpowerloweredtodecayheatlevelandthereactivityloweredaround−20$,thus,thepossibilityofsevererecriticalitywaseliminated.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2008
Journal title
Nuclear Engineering and Design Eslah
Record number
894979
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