<報文>陽イオン-陽イオン弱結合モデルによる低原子価金属添加 UO_2 の酸素ポテンシャル計算ならびに燃料の高燃焼度化の可能性の検討

概要

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A cation-cation weak interaction model is presented, and the oxygen potential change of UO_2 and/or MOX fuels, when M^<2+> or M^<3+> metal is incorporated, is calculated by this model in which the intra-cation complex (M^<3+>U^<5+>) was assumed to be formed in M^<3+>_yU_<1-y>O_<2+x> while two kinds of complexes, i.e. (M^<2+>U^<5+>) and (M^<2+>2U^<5+>) were assumed in M^<2+>_yU_<1-y>O_<2+x> with an average composition, (M^<2+>αU^<5+>). Comparing with the experimental results reported, not only the nearly vertical change of ⊿G^^^-_o_2 for M^<2+> solid solutions but also the variation of ⊿G^^^-_o_2 in the wide range of x values were found to be well expressed by this model. After the present approximation was verified to be reasonable by means of the Flory method, the model was applied to the multiphase systems of UO_2 and/or MOX containing soluble fission product metals, showing good agreement. From these results, it can be predicted that if the solid solutions of UO_2 or MOX with low valence metals are prepared and used in reactors from their fully reduced states, their oxygen potential increase is relatively small in a long range of burnups, i.e. good performance is expected for such fuels up to high burnups.uranium dioxideMOXfission productsoxygen potentialstatistical thermodynamicsnuclear fuelirradiation behaviorhigh burnupsFlory approximation
東北大学の論文
1993-03-30