Abstract
Following the OECD SERENA phase 2 program and EC SARNET-2 network conclusions, oxidation was identified as a major issue for a comprehensive modelling of Fuel Coolant Interaction (FCI). Indeed, the topic is very complex, involving hydrogen and void generation, strong heat release and change of material properties, in particular regarding solidification. Based on a literature review and recent experimental data, the mechanisms related to oxidation are revisited. Following this work, a kinetic model of oxidation is being built and applied to the thermohydraulic code MC3D, based on the competition between H2/vapor inter-diffusion in the boundary layer and oxygen diffusion in the melt. Two drop configurations are considered here, in subcooled water and in superheated steam. Faced with the paucity of experimental data in terms of kinetics of reaction above the metal melting point, direct numerical simulations are performed in order to compare the reaction rates with those given by the macroscopic model and to provide a local scale observation of the boundary layer surrounding the drop during the process of oxidation.
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