Reaction of hydrogen peroxide with uranium zirconium oxide solid solution; Zirconium hinders oxidative uranium dissolution

Kumagai, Yuta ; Takano, Masahide ; Watanabe, Masayuki

We studied oxidative dissolution of uranium and zirconium oxide [(U,Zr)O $_{2}$ ] in aqueous H $_{2}$ O $_{2}$ solution. The interfacial reaction is essential for anticipating how a (U,Zr)O $_{2}$ -based molten fuel may chemically degrade after a severe accident under influence of ionizing radiation. We conducted our experiments with (U,Zr)O $_{2}$ powder and quantitated the H $_{2}$ O $_{2}$ reaction via dissolved U and H $_{2}$ O $_{2}$ concentrations. The dissolution yield relative to H $_{2}$ O $_{2}$ consumption was far less for (U,Zr)O $_{2}$ compared to that of UO $_{2}$ . The reaction kinetics indicates that most of the H $_{2}$ O $_{2}$ catalytically decomposed to O $_{2}$ at the surface of (U,Zr)O $_{2}$ . We confirmed the H $_{2}$ O $_{2}$ catalytic decomposition via O $_{2}$ production (quantitative stoichiometric agreement). In addition, post-reaction Raman scattering spectra of the undissolved (U,Zr)O $_{2}$ showed no additional peaks (indicating a lack of secondary phase formation). The (U,Zr)O $_{2}$ matrix is much more stable than UO $_{2}$ against H $_{2}$ O $_{2}$ -induced oxidative dissolution.

Language	:	English
Journal	:	Journal of Nuclear Materials
Volume	:	497
Number	:
Pages	:	p.54 - 59
Publication Year/Month	:	2017/12
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Paper URL	:	https://doi.org/10.1016/j.jnucmat.2017.10.050
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Keywords	:	ウラン酸化物; ジルコニウム; 過酸化水素
Research Facility	:	第4研究棟
Press Release	:	被覆材が混ざった核燃料は水に溶けにくくなる; 燃料デブリの炉内安定性に係る新たな知見
Article of JAEA R&D Review	:	Zirconium Hinders the Oxidative Dissolution of Nuclear Fuel; Effect of Zirconium Incorporation in Uranium Oxide upon Inhibiting Oxidative Dissolution[/]
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Registration No. : AA20170224
JAEA Abstracts No. : 46000130
Paper Submission No. : 19759

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