[2C16-21] Decommissioning Technology for Fukushima 2

[2C20] Development of ultramicro analysis technology for fuel debris analysis

(7)Study of fuel debris stability for geological disposal - Behavior of (Fe,Ce)O_x dissolution

*Kazuya Idemitsu¹, Suguru Minamihara¹, Yaohiro Inagaki¹, Tatsumi Arima¹ (1. Kyushu University)

Keywords:Simulated fuel debris, Dissolution rate, (Ce, Fe)Ox

Microchannel leaching tests of simulated fuel debris (Ce and Fe oxide) were carried out on 1 M of NaCl. The dissolution rate was 150 nm/y, 2000 times higher than that of pure CeO₂ at the bigining, but the dissolution rate decreased with time to 100 times (8 nm/y). It was observed that grains smaller than 1 µm were dissolved faster.