Reaction of hydrogen peroxide on simulated fuel debris in aqueous solution

Kumagai, Yuta ; Takano, Masahide ; Watanabe, Masayuki

In the severe accident at Fukushima, the reactor cores of Unit 1, 2 and 3 largely melted. Intense ionizing radiations in the reactors may induce leaching of the molten fuel debris. Water radiolysis generates hydrogen peroxide (H $_{2}$ O $_{2}$ ), which would oxidize uranium (U) to more soluble hexavalent on the debris surface. To understand the effect of H $_{2}$ O $_{2}$ , reaction of H $_{2}$ O $_{2}$ with simulated fuel debris was studied. The simulated debris used in this study was solid solution of U and zirconium oxides ((U,Zr)O $_{2}$ ). The dissolution rate of U from (U,Zr)O $_{2}$ was remarkably lower than that from U(IV) oxide (UO $_{2}$ ). Meanwhile, production of oxygen (O $_{2}$ ) was observed as the product of the reaction with (U,Zr)O $_{2}$ and was approximately half the consumption of H $_{2}$ O $_{2}$ , indicating the catalytic decomposition of H $_{2}$ O $_{2}$ . This suggests that the leaching of U from (U,Zr)O $_{2}$ was inhibited due to the catalytic decomposition of H $_{2}$ O $_{2}$ . The fuel debris is expected to be more resistant to H $_{2}$ O $_{2}$ than UO $_{2}$ .

Language	:	English
Journal	:	Proceedings of 20th Nuclear Plant Chemistry International Conference (NPC 2016) (USB Flash Drive)
Volume	:
Number	:
Pages	:	6 Pages
Publication Year/Month	:	2016/10
Meeting title	:	20th Nuclear Plant Chemistry International Conference (NPC 2016)
Held date	:	2016/10
Location (city)	:	Brighton
Location (country)	:	U.K.
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Keywords	:	no keyword
Research Facility	:	第4研究棟
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Registration No. : BB20160596
JAEA Abstracts No. :
Paper Submission No. : 26666

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