Title of article
DryoutheatfluxexperimentswithdeepheterogeneousparticlebedOriginalResearchArticle
Author/Authors
I.Lindholm، نويسنده , , S.Holmstr?m، نويسنده , , J.Miettinen، نويسنده , , Ville Lestinen، نويسنده , , J.Hyv?rinen، نويسنده , , P.Pankakoski، نويسنده , , H.Sj?vall، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2006
Pages
15
From page
2060
To page
2074
Abstract
AtestfacilityhasbeenconstructedatTechnicalResearchCentreofFinland(VTT)tosimulateasaccuratelyaspossibletheex-vesselcoreparticlebedintheconditionsofOlkiluotonuclearpowerplant.TheSTYXparticlebedreproducestheanticipateddepthofthebedandthesizerangeofparticleshavingirregularshape.Thebedisimmersedinwater,creatingtopfloodingconditions,andinternallyheatedbyanarrayofelectricalresistanceheatingelements.Dryouttestshavebeensuccessfullyconductedat0.1–0.7MPapressureforbothuniformlymixedandstratifiedbedgeometries.Inalltests,includingthestratifiedones,thedryzonefirstformednearthebottomofthebed.Themeasureddryoutheatfluxesincreasedwithincreasingpressure,from232kW/m2atnearatmosphericpressureto451kW/m2at0.7MPapressure.Thedatashowsomescatterevenfortheuniformbed.Thetestswiththestratifiedbedindicateaclearreductionofcriticalpowerduetothepresenceofalayerofsmallparticlesontopoftheuniformbed.Comparisonofdatawithvariouscriticalpower(dryoutheatflux)correlationsforporousmediashowsthatthemostimportantparameterinthemodelsistheeffectiveparticlediameter.Adiabaticdebrisbedflowresistancemeasurementswereconductedtodeterminethemostrepresentativeparticlediameter.Thisdiameterisclose,butnotequal,totheparticlenumber-weightedaveragediameterofthebedmaterial.Withit,uniformbeddatacanbecalculatedtowithinanaccuracyof3–28%usingLipinskiʹs0-Dmodel.Inthestratifiedbedexperiments,itappearsthatthetoplayerwaspartiallyfluidized,hencethemeasuredcriticalpowerwassignificantlyhigherthancalculated.Futureexperimentsarebeingplannedwithdensertoplayermaterialtoeliminatenon-prototypicfluidization.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2006
Journal title
Nuclear Engineering and Design Eslah
Record number
941322
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