Uncertainty Quantification of the PHEBUS FPT-1 Test Modelling Results

One of the biggest experimental programs helping to improve nuclear installation safety is PHEBUS, an international cooperative research program that provides data for validating computer codes dedicated analysis severe accidents and their calculation results. In European Union, HORIZON 2020 EURATOM project MUSA (Management Uncertainties Severe Accidents) in progress. Modelling PHEBUS FPT-1 test within frame this provided by partners using different accident codes. Uncertainty quantification received results methods statistical tools. The Lithuanian Energy Institute (LEI) taking part uncertainty exercise. LEI RELAP/SCDAPSIM code together with GRS methodology SUSA tool evaluate uncertainties modelling test. article, are presented. Provided total hydrogen generation showed upper lower limits bounding data. At end calculation, calculations band uncertainties. Cs/I release fraction until middle heat-up phase, but at experiment, calculated limit than Results sensitivity thermal conductivity ZrO2 layer shroud has dominant influence on Other important parameters changing phases. future, it planned update model analysis. This will allow a better agreement