Adressing Uncertainty Analyses

The complexity of the analysis of an accident in a NPP require a multiphysic approach. Different specific codes are used in a coupled way to obtain a global best estimate evaluation of the NPP. This poses the issue of the evaluation of the uncertainty for such kind of calculations and the development of suitable methodologies. In the framework of the project the potential uncertainties affecting the prediction of the plant behaviorduring selected accidents are investigated. The selected accidents are constituted by LOCA and SGTR. Both the accidents events are considered in the evolution as DBA and as DEC-A.