[1F10-13] Computational Science for Nuclear Safety

[1F13] Development of the Multi-Phase Multi-Component Thermal-Hydraulic Simulation Method for MCCI based on MPS Method

*Fukuda Takanari¹, Yamaji Akifumi¹, Takei Haruki¹, Yamashita Susumu², Yoshida Hiroyuki² (1. Waseda Univ., 2. JAEA)

Keywords:MPS method, multi-phase multi-component flow, interface tension, MCCI, VULCANO VF-U1 experiment, JUPITER code

While the understanding of MCCI can be fundamentally improved if the mechanism of the distribution of the fuel debris’ internal status formed through Molten Core-Concrete Interaction (MCCI) in VULCANO VF-U1 experiment, preceding numerical methods have had difficulty to comprehensively analyze the dynamics of the complex multi-component interfaces involving solid-liquid phase changes and liquid-gas interaction. In this study, an interface tension model and a simplified gas model for MPS method have been newly developed, which are compatible with integrated implementation in MCCI analysis with the accurate model of solid-liquid phase change. Utilizing the integrated MPS method, the understanding of MCCI have been deepened by revealing the mechanism of characteristic debris’ distribution in VULCANO VF-U1 experiment.