[2E14-18] Evaluation of severe accident and Cs behavior

[2E14] Oxidation and evaporation behaviors of Mo under a severe accident conditions

*Jiazhan LIU¹, Kunihisa NAKAJIMA¹, Shuhei MIWA¹, Hidetoshi KARASAWA¹, Masahiko Osaka¹ (1. Japan Atomic Energy Agency)

Keywords:severe accident, Mo, oxidation, evaporation

To construct a precise Mo release model in a severe accident, oxidation and evaporation behaviors of metallic Mo powders were investigated by the thermogravimetric analysis technique. The experimental results showed that oxidation and evaporation rates of Mo were influenced by oxygen diffusion rates in the gas phase and the solid MoO₂ layer formed on the surface of Mo powders. Mechanism of these diffusions will be discussed.