Title of article
ValidationoftheCFDcodefluentbypost-testcalculationofadensity-drivenROCOMexperimentOriginalResearchArticle
Author/Authors
AndreasSchaffrath، نويسنده , , Klaus-ChristianFischer، نويسنده , , ThomasHahm، نويسنده , , SteffenWussow، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2007
Pages
10
From page
1899
To page
1908
Abstract
Duringthelastyears,borondilutioneventswiththepotentialofreactivitytransientswereanimportantissueofGermanPWRsafetyanalyses.Acoolantwithalow-boronconcentrationcouldbecollectedinlocalizedareasofthereactorcoolantsystem,e.g.,byseparationofaboratedreactorcoolantintohighlyconcentratedanddilutedfractions(inherentdilution)whichcanoccurduringreflux-condenserheattransferafterasmallbreaklossofcoolantaccidentwithalimitedavailabilityoftheemergencycorecoolingsystems.
Duringthecourseoffollowercoreassessments,TÜVNORDSysTecappraisessafetyanalysesofborondilutioneventspresentedbytheutilities.Theseanalysesarebasedonthesimulationofborondilutionandtransportprocessesinconjunctionwithanumberofdedicatedexperiments.Theanalysesdemonstratethatborondilutioneventscannotleadtorecriticalityofthecore.Hence,theboronconcentrationatthecoreinlethastobedetermined.
TÜVNORDSysTecappliestheCFDcodeFLUENTfortheinvestigationofborondilutioneventsinpressurizedwaterreactors.ToaffirmtheFLUENTabilitiesforthesimulationofborondilutionevents,avalidationagainsttheROCOMexperimentT6655_21withadensity-drivencoolantmixingwasperformed.ThisvalidationprovesthatFLUENTisabletoappropriatelysimulatetheeffectsofborontransportanddilutionsuchasstreaksofcoolantwithlowerdensityinthedowncomer.Deficitswereidentifiedinthesimulationoffluidlayeringinthecoldleg,whichfortunatelyhavearathersmallinfluenceonthepredictedcoreinletconcentration.Therefore,theboronconcentrationinthereactorcorecanbedeterminedwithsufficientaccuracytosolvethesafetyissue,regardlessofthecorebecomingcriticalornot.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2007
Journal title
Nuclear Engineering and Design Eslah
Record number
941370
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