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使用済み燃料プール事故時の燃料被覆管の酸化挙動に関する研究

Study on oxidation behavior of cladding for accident conditions in spent fuel pool

根本 義之  ; 加治 芳行  ; 小川 千尋; 中島 一雄*; 東條 匡志*; 後藤 大輔*

Nemoto, Yoshiyuki; Kaji, Yoshiyuki; Ogawa, Chihiro; Nakashima, Kazuo*; Tojo, Masayuki*; Goto, Daisuke*

使用済み燃料プール(SFP)における冷却材喪失事故時の安全性向上に関する研究として、燃料破損につながる燃料被覆管の高温空気中での酸化挙動を把握するために、被覆管の短尺試料の均熱条件での酸化試験と長尺試料にSFPの水位低下時を模擬した温度分布を与えた条件での酸化試験を実施し、燃料被覆管の酸化挙動に及ぼす温度勾配及び予備酸化皮膜の影響に関する知見を得た。

In order to clarify the air oxidation behavior of the cladding at high temperatures for study on improvement of safety for accident conditions in spent fuel pool, the oxidation tests for both small specimens under constant temperature conditions and long specimens under loss of coolant simulated temperature conditions were carried out, and the knowledge for influence of both temperature gradient and preoxide film on oxidation behavior of the cladding were obtained in this study.

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