WECHSL - Computes the interaction of a core melt with concrete in a severe accident

The WECHSL-Mod3 code is developed for the analysis of the thermal and chemical interaction of initially molten reactor materials with concrete in a one- or two-dimensional, axial symmetric concrete cavity. The code performs calculations from the time of initial contact of a hot molten pool over start of solidification processes until long term basemat erosion over several days with the possibility of basemat penetration.