Influence of Concrete Properties on Molten Core-Concrete Interaction: A Simulation Study

In a severe nuclear power plant accident, the molten core can be released into the reactor pit and interact with sacrificial concrete. In this paper, a simulation study is presented that aims to address the influence of sacrificial concrete properties on molten core-concrete interaction (MCCI). In particular, based on the MELCOR Code, the ferrosiliceous concrete used in European Pressurized Water Reactor (EPR) is taken into account with respect to the different ablation enthalpy and Fe 2 O 3 and H 2 O contents. Results indicate that the concrete ablation rate as well as the hydrogen generation rate depends much on the concrete ablation enthalpy and Fe 2 O 3 and H 2 O contents. In practice, the ablation enthalpy of sacrificial concrete is the higher the better, while the Fe 2 O 3 and H 2 O content of sacrificial concrete is the lower the better.