[2B18-21] Deburis 4

5:10 PM - 5:25 PM JST(8:10 AM - 8:25 AM UTC)

[2B18] Human Resource Development for Research Based on Fuel Debris Study and SEEM-ology Buildup(Part 5)Thermodynamic analysis of Fe-O and U-O system phase diagrams

*Katsunari Oikawa¹ (1. Tohoku University)

Keywords:

Debris,Phase diagram,thermodynamic

The debris has been removed from the Fukushima Daiichi Nuclear Power Station, and analysis of the debris has begun. It is expected that the formation history of the debris can be estimated from these analyses. In order to consider the results of debris analysis, phase diagrams of U-Zr-O, U-Fe-O, U-Zr-Fe-O are useful. The CALPHAD method is useful to calculate the phase equilibria of multicomponent systems. In this study, we aimed to construct a thermodynamic database to calculate the phase diagram of U-Zr-Fe-O system. First, thermodynamic analyses of the Fe-O and U-O systems were performed to determine the thermodynamic parameters. The calculation results reproduced the experimental data on the phase boundaries and thermodynamic properties of these binary systems.