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Influences of Am and Np on oxygen potentials of MOX fuels

MOX燃料の酸素ポテンシャルへのAmとNpの影響

中道 晋哉  ; 加藤 正人   ; 田村 哲也*

Nakamichi, Shinya; Kato, Masato; Tamura, Tetsuya*

原子力機構ではAmやNpのようなMAを含有したMOX燃料の開発を行っている。本研究では特に、MAを微量に添加した場合におけるMOX燃料の酸素ポテンシャルに着目した。1473, 1573及び1623Kにおける(Am$$_{0.024}$$Pu$$_{0.311}$$U$$_{0.665}$$)O$$_{2-x}$$及び(Am$$_{0.01}$$Np$$_{0.12}$$Pu$$_{0.29}$$U$$_{0.58}$$)O$$_{2-x}$$の定比組成近傍の酸素ポテンシャルについて熱重量法により測定した。(Am$$_{0.024}$$Pu$$_{0.311}$$U$$_{0.665}$$)O$$_{2-x}$$及び(Am$$_{0.01}$$Np$$_{0.12}$$Pu$$_{0.29}$$U$$_{0.58}$$)O$$_{2-x}$$はMAを含まない(Pu$$_{0.30}$$U$$_{0.70}$$)O$$_{2-x}$$の酸素ポテンシャルに比べてわずかに高くなった。本研究から、MOXの酸素ポテンシャルはAmの影響によりわずかに高くなり、Npの影響はほとんど受けないことがわかった。

Japan Atomic Energy Agency has developed homogeneous MOX fuels containing minor actinides (MAs) such as Am and Np elements. In this work, particular attention is paid to the influence of small MA addition on oxygen potential of MOX fuels. Oxygen potentials of (Am$$_{0.024}$$Pu$$_{0.311}$$U$$_{0.665}$$)O$$_{2-x}$$ and (Am$$_{0.01}$$Np$$_{0.12}$$Pu$$_{0.29}$$U$$_{0.58}$$)O$$_{2-x}$$ in the near stoichiometric region were measured at 1473, 1573 and 1623K by thermogravimetry. (Am$$_{0.024}$$Pu$$_{0.311}$$U$$_{0.665}$$)O$$_{2-x}$$ and (Am$$_{0.01}$$Np$$_{0.12}$$Pu$$_{0.29}$$U$$_{0.58}$$)O$$_{2-x}$$ were slightly higher than those of (Pu$$_{0.30}$$U$$_{0.70}$$)O$$_{2-x}$$. From this work, it was found that oxygen potential of MOX is slightly increased by small Am addition and influence of Np addition on oxygen potential is not significant.

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パーセンタイル:52.23

分野:Thermodynamics

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