Title of article :
Incorporatingreliabilityanalysisintothedesignofpassivecoolingsystemswithanapplicationtoagas-cooledreactorOriginalResearchArticle
Author/Authors :
FranciscoJ.Mackay، نويسنده , , GeorgeE.Apostolakis، نويسنده , , PavelHejzlar، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Abstract :
Atime-dependentreliabilityevaluationofatwo-looppassivedecayheatremoval(DHR)systemwasperformedaspartoftheiterativedesignprocessforahelium-cooledfastreactor.ThesystemwasmodeledusingRELAP5-3D.TheuncertaintiesininputparameterswereassessedandwerepropagatedthroughthemodelusingLatinhypercubesampling.AnimportantfindingwasthediscoverythatthesmallerpressurelossthroughtheDHRheatexchangerthanthroughthecorewouldmaketheflowtobypassthecorethroughoneDHRloop,iftwoloopsoperatedinparallel.ThisfindingisawarningagainstmodelingonlyonelumpedDHRloopandassumingthatnofthemwillremoventimesthedecaypower.Sensitivityanalysesrevealedthattherearevaluesofsomeinputparametersforwhichfailuresareveryunlikely.Thecalculatedconditional(i.e.,giventheLOCA)failureprobabilitywasdeemedtobetoohighleadingtotheidentificationofseveraldesignchangestoimprovesystemreliability.Thisstudyisanexampleofthekindsofinsightsthatcanbeobtainedbyincludingareliabilityassessmentinthedesignprocess.ItisdifferentfromtheusualuseofPSAindesign,whichcomparesdifferentsystemconfigurations,becauseitfocusesonthethermal–hydraulicperformanceofasafetyfunction.
Journal title :
Nuclear Engineering and Design Eslah
Journal title :
Nuclear Engineering and Design Eslah
