Title of article
Developmentofathermal-hydraulicanalysiscodeforannularfuelassembliesOriginalResearchArticle
Author/Authors
KyuHyunHan، نويسنده , , SoonHeungChang، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2003
Pages
9
From page
267
To page
275
Abstract
Athermal-hydraulicanalysiscodewhichiscapableofmodelingbothinternallyandexternallycooledannularfuelpinswasdeveloped.Thecoolantflowdistributionintheannularfuel-basedassembliesisadjustedbyapressuredropmodelallowingforconditionssuchasnon-equalvelocityandnon-saturatedphases.Theheattransferfractionisdeterminedbytheratioofcross-sectionalareasdistinguishedbytheradiusatwhichthefirstderivativeofthetemperaturewithintheannularfuelequalszero.ThecodepredictionshavebeencomparedwithcalculationsfromKoreaAtomicEnergyResearchInstitute(KAERI)andMIT.TheheattransferfractiondifferencebetweenthecodeandRELAPwasabout3.9%,andtheDeparturefromNucleateBoilingRatio(DNBR)predictionofthecodeagreedwellwiththeMIT’sresultintheregionbelow3m.Fortheapplicationofthecode,thermal-hydraulicsofthorium-basedfuelassembliesloadedwithannularseedpinswerecomparedwiththoseoftheexistingthorium-basedassemblies.Thepressuredropintheassemblygenerallyincreasedinthecaseofannularfuelduetothelargerwettedperimeter.Intheinnersubchannelsoftheseedpins,massfluxeswerehighduetothegridformlossesintheoutersubchannels.About43%oftheheatgeneratedfromtheseedpinflowedintotheinnersubchannelandtherestintotheoutersubchannel.TheminimumDNBRs(MDNBRs)oftheannularfuel-basedassemblieswerehigherthanthoseoftheexistingones.Becauseinterchannelmixingcannotoccurintheinnersubchannels,temperaturesandenthalpieswerehigherintheinnersubchannels.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2003
Journal title
Nuclear Engineering and Design Eslah
Record number
894631
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