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

Kumagai, Yuta

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 $_{2}$ .

Language	:	Japanese
Journal	:	Hoshasen Kagaku (Internet)
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Number	:	107
Pages	:	p.77 - 78
Publication Year/Month	:	2019/04
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Keywords	:	二酸化ウラン; 過酸化水素; 酸化; 溶解; 反応中間体
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Registration No. : AA20180719
JAEA Abstracts No. : 48000265
Paper Submission No. : 22605

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Effect of HO concentration on oxidative dissolution of UO

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