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Property measurements of (U$$_{0.7}$$,Pu$$_{0.3}$$)O$$_{2-x}$$ in $$P$$$$_{O2}$$-controlled atmosphere

酸素分圧制御雰囲気における(U$$_{0.7}$$,Pu$$_{0.3}$$)O$$_{2-x}$$の特性評価

加藤 正人  ; 村上 龍敏 ; 砂押 剛雄*; Nelson, A. T.*; McClellan, K.*

Kato, Masato; Murakami, Tatsutoshi; Sunaoshi, Takeo*; Nelson, A. T.*; McClellan, K.*

MOX燃料は、不定比性酸化物である。不定比性は、MOXの物性値に大きく影響する。そのため、酸素ポテンシャルとO/M比の関係がこれまで調べられてきた。その測定結果は、高温においてO/M比を一定に保つためには酸素分圧をコントロールすることが不可欠であることを示している。本研究では、酸素分圧をコントロールした雰囲気において、焼結特性, O/M変化,熱膨張率などの測定を行った。

Uranium and plutonium mixed oxide (U$$_{0.7}$$,Pu$$_{0.3}$$)O$$_{2-x}$$ which has been developed as a fast reactor fuel is nonstoichiometric compound. The stoichiometry significantly affects various properties. The relationship between oxygen potential and oxygen-to-metal (O/M) ratio has been investigated so far. The measurement results showed that it is essential to control oxygen partial pressure ($$P$$$$_{O2}$$) for holding constant O/M ratio in high temperature range. Therefore, properties of (U$$_{0.7}$$,Pu$$_{0.3}$$)O$$_{2-x}$$ were measured in $$P$$$$_{O2}$$-controlled atmosphere in this work. In this work, properties of O/M change, sintering and thermal expansion were investigated in $$P$$$$_{O2}$$-controlled atmosphere.

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