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Journal Articles

Effect of H $_{2}$ O $_{2}$ concentration on oxidative dissolution of U $_{2}$ O

Kumagai, Yuta

Hoshasen Kagaku (Internet), (107), p.77 - 78, 2019/04

Reaction of hydrogen peroxide (H $_{2}$ O $_{2}$ ) with uranium dioxide (UO $_{2}$ ) oxidizes U(IV) to water-soluble U(VI). In the concept of direct geological disposal of spent nuclear fuel, this reaction is expected to induce dissolution of UO $_{2}$ matrix of the spent fuel. This study investigate effect of H $_{2}$ O $_{2}$ concentration on the kinetics and the yield of U(VI) dissolution of this reaction. A series of experiments of the reaction of H $_{2}$ O $_{2}$ with UO $_{2}$ powder dispersed in water has been carried out. The experimental results reveal that increase in the H $_{2}$ O $_{2}$ concentration slows down the reaction and decreases the yield of U(VI) dissolution. This observation suggests that a reaction intermediate is generated in the course of the H $_{2}$ O $_{2}$ reaction on the surface of UO $_{2}$ .