[2J13-16] Simulation & Analysis

[2J15] Preliminary Analysis of Spatially Distributed Metallic Phase Formation in MCCI with MPS Method

*Takanari Fukuda¹, Akifumi Yamaji¹, Li Xin¹ (1. Waseda Univ.)

Keywords:MCCI, VULCANO VF-U1 experiment, Segregation and solidification, Decommissioning of Fukushima reactors , Fuel debris retrieval from Fukushima reactors , MPS method

For the retrieval of the fuel debris, it is important to predict the spatial status distribution inside the solidified fuel debris which accumulated on and ablated the concrete substrate, with the understanding of the Molten Core Concrete Interaction (MCCI). In the meantime, the MCCI experiment, VULCANO VF-U1 was designed and performed, then the segregation and the spatial distributed solidification of metallic corium phase has been observed. Thus, this study aims to analyze the flow and the solidification of metallic corium phase in the oxidic corium phase, utilizing the Moving Particle Semi-implicit (MPS) method, which is based on Lagrangian method, and therefore, advantageous to handle the complex surfaces among multiple phases.