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Oxygen potential of (U$$_{0.88}$$Pu$$_{0.12}$$)O$$_{2pm x}$$ and (U$$_{0.7}$$Pu$$_{0.3}$$)O$$_{2pm x}$$ at high temperatures of 1673-1873 K

(U$$_{0.88}$$Pu$$_{0.12}$$)O$$_{2pm x}$$及び(U$$_{0.7}$$Pu$$_{0.3}$$)O$$_{2pm x}$$の1673-1873Kでの酸素ポテンシャル

加藤 正人; 武内 健太郎; 内田 哲平; 砂押 剛雄*; 小無 健司*

Kato, Masato; Takeuchi, Kentaro; Uchida, Teppei; Sunaoshi, Takeo*; Konashi, Kenji*

MOXの酸素ポテンシャルは、多くの報告がされているが、それらのデータは、大きなバラツキを持っている。本研究では、12%と30%Puを含むMOXについて1673-1873Kの温度範囲でガス平衡法により酸素ポテンシャル測定を行った。測定データは、点欠陥モデルにより解析され、定比組成の酸素ポテンシャルを決定し、酸素ポテンシャルに及ぼすPu含有率の影響について評価した。MOXの酸素ポテンシャルは、Pu含有率の増加で上昇した。12%と30%Puを含むMOXの酸素ポテンシャルは、1773Kで-334kJ/mol及び-296kJ/molと得た。

Many studies on oxygen potentials have been reported, but their data were scattered and the data at high temperatures are limited. In this work, the oxygen potential of (U$$_{0.88}$$Pu$$_{0.12}$$)O$$_{2pm x}$$ and (U$$_{0.7}$$Pu$$_{0.3}$$)O$$_{2pm x}$$ was measured at high temperatures of 1673-1873 K using gas equilibrium method using thermo-gravimetry. The influence of Pu addition on the oxygen potential of MOX was discussed. The oxygen potential and the O/M ratio were decided by in-situ analysis. The oxygen partial pressure was adjusted by controlling the ratio of $$P$$$$_{H_{2}}$$/$$P$$$$_{H_{2}}$$O in the flowing gas atmosphere, and the oxygen potential was determined. The oxygen potentials measured by the point defect model. The deviation x varied with the relation of in the near stoichiometric composition region. The oxygen potential increased with increasing Pu content. The values of stoichiometric MOX containing 12% and 30%Pu were determined to be -334 kJ/mol and -296 kJ/mol, respectively, at 1773 K.

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