Corrosion of uranium and plutonium dioxides in aqueous solutions

Otobe, Haruyoshi ; Kitatsuji, Yoshihiro ; Kurata, Masaki ; Takano, Masahide

The chemical and transport behaviors of Pu and U in the corroded debris must be understood for the criticality safety control of Pu and U in the debris, especially for the removal operations and storage. Therefore, the chemical changes of UO $_{2}$ and PuO $_{2}$ powders, disks and U and Pu metal disks in H $_{2}$ O $_{2}$ aqueous solution have been checked, where H $_{2}$ O $_{2}$ is formed by the radiolysis of H $_{2}$ O. As a result, UO $_{2}$ changed to hydrated uranium peroxide, whereas the PuO $_{2}$ remained unchanged. U metal was more reactive with H $_{2}$ O $_{2}$ aqueous solution than Pu metal. The chemical changes of the mixed UO $_{2}$ /PuO $_{2}$ powders in H $_{2}$ O $_{2}$ aqueous solution have been investigated. The dried slurry of the middle zone of H $_{2}$ O $_{2}$ aqueous solution was mainly composed of hydrated uranium peroxide, whereas the dried powder of the bottom zone was mainly composed of PuO $_{2}$ .

Language	:	English
Journal	:	Proceedings of 2014 Nuclear Plant Chemistry Conference (NPC 2014) (USB Flash Drive)
Volume	:
Number	:
Pages	:	11 Pages
Publication Year/Month	:	2014/10
Meeting title	:	2014 Nuclear Plant Chemistry Conference (NPC 2014)
Held date	:	2014/10
Location (city)	:	Sapporo
Location (country)	:	Japan
Patent information	:
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Keywords	:	水化学; プルトニウム; 福島第一原子力発電所事故; Fukushima Daiichi Nuclear Power Station Accident
Research Facility	:	プルトニウム研究1棟
Press Release	:
Article of JAEA R&D Review	:	How do Microscopic Particles of Debris Change in Water?; To Understand the Chemical Effects of Hydrogen Peroxide and Boric Acid[/]
Cooperating Institute	:	資源エネルギー庁

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Registration No. : BB20141333
JAEA Abstracts No. : 43001120
Paper Submission No. : 16218

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