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Uranium dissolution and uranyl peroxide formation by immersion of simulated fuel debris in aqueous H$$_{2}$$O$$_{2}$$ solution

Kumagai, Yuta   ; Kusaka, Ryoji  ; Nakada, Masami  ; Watanabe, Masayuki   ; Akiyama, Daisuke*; Kirishima, Akira*; Sato, Nobuaki*; Sasaki, Takayuki*

We investigated potential degradation of fuel debris caused by H$$_{2}$$O$$_{2}$$, which is the oxidant of major impact from water radiolysis. We performed leaching experiments on different kinds of simulated debris comprising U, Fe, Cr, Ni, and Zr in an aqueous H$$_{2}$$O$$_{2}$$ solution. Chemical analysis of the leaching solution showed that U dissolution was induced by H$$_{2}$$O$$_{2}$$. Raman analysis after the leaching revealed that uranyl peroxides were formed on the surface of the simulated debris. These results demonstrate that uranyl peroxides are possible alteration products of fuel debris from H$$_{2}$$O$$_{2}$$ reaction. However, the sample in which the main uranium-containing phase was a U-Zr oxide solid solution showed much less uranium dissolution and no Raman signal of uranyl peroxides. Comparison of these results indicates that formation of an oxide solid solution of Zr with UO$$_{2}$$ improves the stability of fuel debris against H$$_{2}$$O$$_{2}$$ reaction.

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Category:Nuclear Science & Technology

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