Title of article
IdentificationofdampingmechanismofTRR-IIreactorcontrolrodduringfreefallinsertionOriginalResearchArticle
Author/Authors
S.K.Wang، نويسنده , , Y.N.Chen، نويسنده , , Y.P.Chyou، نويسنده , , T.T.Yang، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2003
Pages
12
From page
243
To page
254
Abstract
Inlightwaterreactors,controlrodsareingeneralinsertedintoreactorsbygravity.Inordertoachievearapidshutdown,itisrequiredtoinsertcontrolrodsasfastaspossible.Ontheotherhand,acontrolrodwithafastfallingvelocitywouldimposeasubstantialimpacttoreactorstructureaswellastotheroditself.Therefore,adampingforcemustcomeintoeffect,especiallyduringthefinalstageofthefreefallofthecontrolrod.Thepurposeofthisstudyistodevelopamathematicalmodelandanumericalsimulationtodescribeandidentifythedampingmechanism;andapplythismodeltothedesignofthecontrolrodusedinTRR-IIreactoroftheInstituteofNuclearEnergyResearch(INER)ofTaiwan.
Thedampingeffectofafallingcontrolrodcomesfromtwofactors:theviscousshearstressoccurredinanarrowgapbetweentherodandanoutertubewhichconfinesthelateralmovementoftherod,andthepressureforceexertedontherodbythecompressedwaterundertherod.Theviscousshearstresscanbeanalyzedbyassumingacouetteflowbetweentherodandtheoutertubesimilartotheviscousforceoccurredinrheology.Indoingthis,theflowrateineachflowpathiscloselyrelatedtothepressuregradientintheflowpathandcanbeevaluatedusinganelectricalcircuitanalogy.TheresultsofthecodepredictionwerecomparedtotheexperimentalresultsascarriedoutbytheINER.Finally,aparametricstudywasappliedtoestimatetheeffectsofthevariousfactorsincludinggapthickness,sizeoftheflowholes,andothergeometricconsiderationsontherodfallingvelocity.Theresultsofthisstudycanservesometechnicalsupportduringthestageofroddesignandmanufacture.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2003
Journal title
Nuclear Engineering and Design Eslah
Record number
894629
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