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Thermodynamic modeling of plutonium oxide containing americium

アメリシウムを含有したプルトニウム酸化物の熱力学モデリング

廣田 正行*; 黒崎 健*; 宇埜 正美*; 山中 伸介*; 三輪 周平; 逢坂 正彦; 田中 健哉

Hirota, Masayuki*; Kurosaki, Ken*; Uno, Masayoshi*; Yamanaka, Shinsuke*; Miwa, Shuhei; Osaka, Masahiko; Tanaka, Kenya

マイナーアクチニドを含有するMOX燃料の相安定性を評価するための第一ステップとして、CALPHAD法に基づいて、熱力学量の文献値を用いて、O-Am二元系及びO-Pu-Am三元系の熱力学モデリングを行った。蛍石構造FCC-C1相における余剰ギブスエネルギーを評価するため、酸素ポテンシャルデータの実測値を用い、相互作用パラメータを最適化した。

In the present study, as a preliminary stage, to assess the phase stability of MA-containing MOX fuel with a fluorite structure which has a variable composition with oxygen defects in its structure, thermodynamic modeling has been performed for O-Am binary system and O-Pu-Am ternary system on the basis of thermodynamic data available in the literature. The interaction parameters of the excess Gibbs energies of the fluorite structure FCC-C1 phase in O-Am and O-Pu-Am systems were evaluated with respect to the deviation from the ideal solution in oxygen potential, respectively. The thermodynamic modeling used in this study is based on the CALculation of PHAse Diagram (CALPHAD) technique.

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