Uncertainty Assessment in the Prediction of Selected Fission Products in the Case of a Postulated Severe Accident Scenario at VVER-1000

Abstract The aim of the paper is to present results and insights gained from analysis postulated severe accident scenario for Nuclear Power Plant (NPP) equipped with a VVER-1000, focusing on uncertainty assessment in prediction selected Fission Products (FPs). To this end, simulation Large Break Loss Coolant Accident (LB LOCA) along Station Blackout (SBO) was carried out. capabilities ASTECv2.2.0.1 [1] (SA) code quantification tool – SUNSET [2] coupled mode used. out eight input variables ten output variables. method incorporated within statistical used order conduct analysis. Based Wilks’ formula, number ASTEC runs determined. main data are obtained fission products as figures merit. steps outlined. Furthermore, brief overview SUNSET/ASTECv2.2.0.1 coupling procedures [3] also presented discussed. This work demonstrates application methodology analyses accidents Plants provides specific recommendations its use. outcomes provided will be useful may base future related evaluation safety VVER-1000.