Overview of mitigation models dedicated to severe accidents and consequences on flow rate through containment concrete structures

This study takes place within the framework of nuclear facilities containment assessment in the case of a hypothetical accident where a large amount of vapour is released. We propose in this paper to simulate the COPAIN test cases in order to assess the vapor condensation model implemented in our CFD tool. The importance of this model is twofold. Indeed, it is also essential to estimate the associated potential leakage rate, i.e. to assess the mass flowrate through cracks in the containment concrete structures. In this context, the vapor condensation along the walls in the cracks is of relevant interest.