Title of article
CoreresponseofaPWRtoaslugofunder-boratedwaterOriginalResearchArticle
Author/Authors
S.Kliem، نويسنده , , U.Rohde، نويسنده , , F.-P.Wei?، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2004
Pages
12
From page
121
To page
132
Abstract
Aparameterstudy,incorporatingstationaryandtransientcorecalculations,wascarriedoutforahypotheticalborondilutioneventinapressurizedwaterreactor,usingthethree-dimensional(3D)neutronkineticscoremodelDYN3Dincombinationwithafastrunningsemi-analyticalcoolantmixingmodel.Itwasassumedthataslugofdeboratedwaterwasformedinoneoftheloops,duetoasecondary-to-primarysteamgeneratorleakageduringoutage.Itwasfurtherassumedthatthisslugisnotrecognisedandthatthefirstmaincoolantpumpisstarted,inpreparationtoreturningtopower.Attheinitiationofpumpstart-up,thereactorisstillinthecoldanddeeplysub-criticalstate.Byvaryingtheinitialslugvolume,itwasfoundinstationarycalculationsthat,forthegivencoreconfiguration,slugsoflessthan14m3donotleadtore-criticality.Transientcorecalculationswithlargerslugvolumesshowasignificantreactivityinsertionandover-criticality.However,accordingtothecalculations,evenanover-criticalityofabout2$didnotleadtosafety-relevantconsequences.ThepowerexcursionismitigatedandstoppedbyDopplerfeedback.Theinfluenceofthecross-sectionlibraryonthecourseofthetransientwasinvestigated,applyinganalternativelibrary.Differencesintheglobalcoreparametersleadtoquantitativedifferencesinthetimeandheightofthepowerexcursion.Inaddition,itisshownthatnumericaldiffusionhastobesuppressedinordertodescribetheborontransportcorrectly,especiallyatlowflowvelocities.Otherwisetheneutronkineticcorebehaviourcannotbecorrectlymodelled.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2004
Journal title
Nuclear Engineering and Design Eslah
Record number
894728
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