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Oral presentation

Formation of a protective layer on (U, Zr)O$$_{2}$$ by the reaction of H$$_{2}$$O$$_{2}$$

Kumagai, Yuta; Kusaka, Ryoji; Watanabe, Masayuki

no journal, , 

A severe accident of a nuclear power plant generates fuel debris due to high-temperature reactions between nuclear fuel with surrounding materials. An oxide solid solution of U and Zr, i.e. (U, Zr)O$$_{2}$$ is a typical phase of the fuel debris. The decommission of a damaged reactor requires a long-term effort and therefore it is important to estimate possible degradation processes of the fuel debris for safe operation of the decommissioning. Hence, we have investigated reaction of (U, Zr)O$$_{2}$$ with H$$_{2}$$O$$_{2}$$ because H$$_{2}$$O$$_{2}$$ produced by water radiolysis may cause oxidative degradation of the fuel debris. H$$_{2}$$O$$_{2}$$ reaction with (U, Zr)O$$_{2}$$ powder induced dissolution of U and Zr. The dissolution of U was more significant than that of Zr. The results indicate that a Zr-rich layer formed on the (U, Zr)O$$_{2}$$ surface. The repeated reactions with H$$_{2}$$O$$_{2}$$ resulted in a remarkable decrease in the dissolution of U. Therefore, the formation of the Zr-rich layer is expected to inhibit the further U dissolution.

Oral presentation

Evaluation of applicability of hydroxyapatite to individual dosimeters

Oka, Toshitaka; Yokozuka, Eri*; Seito, Hajime*; Nagasawa, Naotsugu*; Kitatsuji, Yoshihiro

no journal, , 

Alanine dosimeters and Flick dosimeters are known as simple individual dosimeters, but both can only evaluate more than 1 Gy and 40 Gy, respectively, so that they cannot measure low dose in mGy order. In this work, we evaluated the applicability of hydroxyapatite, which is a main component of tooth enamel, as individual dosimeters that can detect from less than 1 Gy to several tens Gy. Commercially available hydroxyapatite (HAP-200) was irradiated by Co-60 gamma-ray and peak height of the ESR radical was plotted against the absorbed dose to obtain the dose response curve. The dose response curve shows a linear relationship from 0 to 10 Gy with the coefficient of determination of R$$^{2}$$=1, indicating that hydroxyapatite can be used as an individual dosimeter instead of tooth enamel.

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