Title of article
Analysisoflikelihoodoflowerheadfailureandex-vesselfuelcoolantinteractionenergeticsforAP1000OriginalResearchArticle
Author/Authors
H.Esmaili، نويسنده , , M.Khatib-Rahbar، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2005
Pages
23
From page
1583
To page
1605
Abstract
Aone-dimensionalmodelisformulatedtoassessthethermalresponseoftheWestinghouseAdvancedPlant(AP1000)lowerheadbasedontwoboundingmeltconfigurations.MeltConfigurationIinvolvesastratifiedlightmetalliclayerontopofamoltenceramicpool,andmeltConfigurationIIrepresentstheconditionsthatanadditionalheavymetallayerformsbelowtheceramicpool.Theapproachconsistsofthespecificationofinitialconditions;determinationofthemode,thesizeandthelocationoflowerheadfailurebasedonheattransferanalyses;computersimulationofthefuelcoolantinteractionprocesses;andfinally,anexaminationoftheimpactoftheuncertaintiesintheinitialconditionsandthemodelparametersonthefuelcoolantinteractionenergeticsthroughaseriesofsensitivitycalculations.TheresultsofthecalculationsformeltConfigurationIshowthattheheatfluxremainsbelowcriticalheatflux(CHF)inthemoltenoxidepool,buttheheatfluxinthelightmetallayercouldexceedCHFbecauseofthefocusingeffectassociatedwithpresenceofthethinmetalliclayers.Thethinmetalliclayersareassociatedwithsmallerquantitiesofthemoltenoxideinthelowerplenumfollowingtheinitialrelocationintothelowerhead.Thecalculationsshowthatthelowerheadfailureprobabilityduetothefocusingeffectofthestratifiedmetallayerrangesfrom∼0.04to∼0.30.Ontheotherhand,thethermalfailureofthelowerheadatthebottomlocationformeltConfigurationIIisassessedtobehighlyunlikely.Basedonthein-vesselretentionanalysis,thebasecasefortheex-vesselfuelcoolantinteraction(FCI)isassumedtoinvolveasidefailureofthevesselinvolvingametallicpourintothecavitywater.TheFCIsensitivitycalculationsintendedtoassesstheimplicationsoftheuncertaintiesininitialconditionsandtheFCImodelingparametersshowthattheFCIloadsrangefromafewMPatoupwardof1000MPa(maximumpoolpressure)withcorrespondingimpulseloadsrangingfromafewkPastoafewhundredkPas.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2005
Journal title
Nuclear Engineering and Design Eslah
Record number
894944
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