Statistical methods for the analysis of margins of safety using code BE+U

This paper presents statistical tools that allow to understand the relationships between the input variables (defined by functions of distribution of Thermo-hydraulic model parameters) and output variable. The objective is to identify the most important input variables because of the effect on output variables. In addition, it is possible to quantify the contribution of the uncertainty of each input in the uncertainty of the results. The presentation takes place on a crazy accident in a PWR as application.