ValidationofRELAP5/MOD3.2modelontripoffonemaincoolantpumpforVVER440/V230OriginalResearchArticle

ThispaperpresentsthevalidationofRELAP5/MOD3.2modeloftheVVER440forNuclearPowerPlant(NPP)intheanalysisofthefollowingtransient:“TripoffoneMCP”. ThisvalidationisaprocessthatcomparestheanalyticalresultsobtainedbyRELAP5/MOD3.2modeloftheVVER440withmeasurementtransientdatareceivedfromKozloduyNPPUnit#4.ThebaselineinputdeckforVVER440wasdevelopedattheInstituteforNuclearResearchandNuclearEnergyforanalysesofoperationaloccurrences,abnormalevents,anddesignbasisscenarios.ItwillprovideasignificantanalyticalcapabilityfortheBulgariantechnicalspecialistslocatedattheKozloduyNPP. Thecriteriausedinselectingtransientare:importancetosafety,availabilityandsuitabilityofdatafollowedbysuitabilityforRELAP5codevalidation.ThecomparisonbetweentheRELAP5calculationsandthetestdataindicatesagoodagreement. ThisvalidationwaspossiblethroughtheparticipationofleadingspecialistsfromKozloduyNPPandwiththesupportoftheArgonneNationalLaboratory,undertheInternationalNuclearSafetyProgram(INSP)oftheUnitedStatesDepartmentofEnergy.