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.

Language	:	English
Journal	:	Journal of Nuclear Science and Technology
Volume	:	59
Number	:	8
Pages	:	p.961 - 971
Publication Year/Month	:	2022/08
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Paper URL	:	https://doi.org/10.1080/00223131.2021.2023055
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	燃料デブリ; 水の放射線分解; 過酸化水素; ウラン; 溶解反応; ウラニル過酸化物; 福島第一原子力発電所事故; Fukushima Daiichi Nuclear Power Station Accident
Research Facility	:	第4研究棟
Press Release	:
Article of JAEA R&D Review	:	Degradation of Fuel Debris Under the Effect of Ionizing Radiation; Formation of Solid Solution Improves Stability to Oxidative Degradation[/]
Cooperating Institute	:	東北大学

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Web of Science® Times Cited Count	:	Times Cited Count： If you would like to get the latest times cited, please access the Web of Science®. http://www.webofknowledge.com/wos
InCites™	:	Percentile:50.01 Category:Nuclear Science & Technology
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Registration No. : AA20210522
JAEA Abstracts No. : 50001091
Paper Submission No. : 25852

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Uranium dissolution and uranyl peroxide formation by immersion of simulated fuel debris in aqueous HO solution

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