[2A03-06] Debris

[2A06] Prediction of Pore Generation for Simulant B₂O₃-UO₂ Fuel Debris Using Multiphase-field Method

*Munemichi Kawaguchi¹, Masayoshi Uno², Sunghyon Jang¹, Kazuhiro Sawa¹ (1. Hokkaido Univ., 2. Univ. of Fukui)

Keywords:Simulated fuel debris, B2O3, UO2, Multi-Phase Field method, Pore, Simulation

Mechanical properties of fuel debris have been investigated using simulated debris for the decommissioning of the Fukushima Daiichi Nuclear Ppower Plant. Microscopic pores in the simulated B₂O₃-UO₂ debris, which is a control rod/nuclear fuel mixture, have a significant influence on the mechanical properties. In this study, Multi-Phase Field method in the B₂O₃-UO₂ system was developed to predict the pore generation.