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Oxygen chemical diffusion in hypo-stoichiometric MOX

ハイポストイキオメトリのMOXの酸素相互拡散

加藤 正人; 森本 恭一; 田村 哲也*; 砂押 剛雄*; 小無 健司*; 青野 茂典; 鹿志村 元明

Kato, Masato; Morimoto, Kyoichi; Tamura, Tetsuya*; Sunaoshi, Takeo*; Konashi, Kenji*; Aono, Shigenori; Kashimura, Motoaki

プルトニウム-ウラン混合酸化物(MOX)は、高速炉用の燃料として開発が進められている。MOX燃料のO/Mは照射中のFCCIをコントロールするため、重要なパラメータである。酸素ポテンシャルと酸素相互拡散係数はMOX中の酸素の挙動を理解するうえで不可欠なデータである。本研究では、(Pu$$_{0.2}$$U$$_{0.8}$$)O$$_{2-x}$$と(Pu$$_{0.3}$$U$$_{0.7}$$)O$$_{2-x}$$について、熱重量法を用いて酸素相互拡散係数を測定した。熱重量計により、還元速度を測定し、その曲線から酸素の相互拡散係数を測定した。その結果、(Pu$$_{0.3}$$U$$_{0.7}$$)O$$_{2-x}$$の拡散係数は、(Pu$$_{0.2}$$U$$_{0.8}$$)O$$_{2-x}$$の拡散係数に比べ低い値であった。

Plutonium and uranium mixed oxide (MOX) has been developed to use as a core fuel of the fast reactor. The oxygen to metal ratio (O/M) of the MOX fuel is an important parameter to control the FCCI. The oxygen potential and the oxygen diffusion coefficient of the MOX are essential data to understand the oxygen behaviour in MOX. The oxygen potentials of the MOX were measured with accuracy as a function of O/M and temperatures in the previous work. In this work the oxygen chemical diffusion coefficient in (Pu$$_{0.2}$$U$$_{0.8}$$)O$$_{2-x}$$ and (Pu$$_{0.3}$$U$$_{0.7}$$)O$$_{2-x}$$ were investigated using thermo gravimetric technique. The kinetics of the reduction processes of (Pu$$_{0.2}$$U$$_{0.8}$$)O$$_{2-x}$$ and (Pu$$_{0.3}$$U$$_{0.7}$$)O$$_{2-x}$$ were measured by TG-DTA method. The oxygen chemical diffusion coefficients have been estimated from the reduction curves. It was concluded that the oxygen chemical diffusion coefficient in (Pu$$_{0.3}$$U$$_{0.7}$$)O$$_{2-x}$$ is a smaller than that of (Pu$$_{0.2}$$U$$_{0.8}$$)O$$_{2-x}$$.

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パーセンタイル:40.8

分野:Materials Science, Multidisciplinary

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