日本原子力学会和文論文誌
Online ISSN : 2186-2931
Print ISSN : 1347-2879
ISSN-L : 1347-2879

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SiC表面におけるSiO2酸化被膜の高温安定性
山口 壮一朗Aikebaier YUSUFU白浜 卓馬村上 幸弘鬼塚 貴志宇埜 正美
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論文ID: J18.044

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  SiC, which is a promising accident-tolerant fuel cladding, is a non-oxide, and it is known that passive oxidation occurs, where by a protective oxide film of SiO2 is formed under atmospheric conditions above 900℃. The reaction occurring at this high temperature is important in assessing the soundness of SiC during a severe accident, but the understanding of it is still insufficient. In this study, to evaluate the high-temperature oxidation behavior when SiC cladding is exposed to the atmosphere (105 Pa) during an accident involving a light-water reactor, an oxidation test was performed for up to 100 h at 1100 to 1500℃. As a result, a SiO2 oxide film was formed on the surface of SiC, but the formation of bubbles originating from impurities and cracks due to a phase transformation was confirmed. In addition, it was observed, for the first time in this research, that a multilayered SiO2 oxide film was formed at 1500℃. Therefore, it was shown that the oxidation reaction of SiC does not stop depending on the surrounding conditions under high temperature and atmospheric conditions.

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