Title of article
PassivecoolingofthePBMRspentandusedfueltanksOriginalResearchArticle
Author/Authors
W.F.Fuls، نويسنده , , E.H.Mathews، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2007
Pages
9
From page
1354
To page
1362
Abstract
Thepebblebedmodularreactor(PBMR)isanewgenerationhightemperaturegas-cooledreactor,makinguseofsphericalfuelelements.Thespentfuelandpartiallyburntfuel(calledusedfuel)isstoredinlargestoragetanks.Thispaperpresentsthecoolingdesignofthestoragetanks,withspecialemphasisonitspassivecoolingability.
Forcorrosionprotection,thetanksarecooledwithaclosedloopactivesystem,however,passivecoolingisseenastheultimatecoolingmodeforthestoragetanks.Iftheactivecoolingfails,theflowautomaticallybypassestheactivesystemandpassivecoolingtakesover.Theactivecoolingisthusnotsafety-related;ratheritspurposeisforinvestmentprotection.
Thestoragetankdesignwithitslongitudinalinternalcoolingpipeshasagoodpassivecoolingability.Thelayoutofthetankconcretecubicleensuresthatcoolingaircanflowonlyinthedesireddirection.Computationalfluiddynamics(CFD)analyseshavebeendoneforvariousheatloadscenariosinsidethetank.Passivecoolingexistsfortankswithalowspentfuelfilllevelwithheatloadbelow25kWuptoatankcontainingafullPBMRcore(usedfuel)withheatloadof640kW.Forallscenarios,themaximumfueltemperatureisbelow400°C.
AmethodwasdevelopedtocalculatethepassivecoolingcharacteristicsofthetankatafractionofthetimeittakesCFDbyusingthepipenetworksimulationsoftwareFlownex.ThemethodwasalsousedtoanalyzetransientpassivecoolingeventsandshowedflowphenomenonsimilartowhatCFDanalyseshavepredicted.
Asmall-scaletwo-dimensionalrepresentationofthestoragetankandcubiclelayouthasbeenbuilt.Thisexperimentdemonstratesthepassivecoolingabilityofthetank.ItalsoprovedtheflowcharacteristicsthatwerepredictedbytheCFDandFlownexanalyses.
Ithasbeenshownthroughdiversetechniquesthatthefuelinsidethetankscanbecooledpassively.Therearestillafewaspectswhichneedtobeexploredinmoredetail,butoverallitcanbesaidthatpassivecoolingofthePBMRspentandusedfuelinbulkstoragetanksisviable.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2007
Journal title
Nuclear Engineering and Design Eslah
Record number
941395
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