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Cs捕獲機能を有する高温ガス炉燃料被覆層の開発

Development of a Cs getter contained coated fuel particle layer for high temperature gas cooled reactor

佐々木 孔英  

Sasaki, Koei

高温ガス炉プラントの被ばく線量低減、原子炉一次系事故時の安全性向上、遮へい壁厚削減に伴うプラントのコンパクト化や建設コスト削減を期待し、Cs捕獲機能を有する燃料被覆材を開発する。Csゲッター材として、BiとSbを選定し、カーボン組織中に模擬Csトラップ化合物を形成させ、1500$$^{circ}$$Cの高温安定性を検証した。Biはカーボン中に析出したもののCs化合物の形成は確認できなかった。Sbはカーボン中にCs化合物(Cs$$_{3}$$Sb等)を形成し、1500$$^{circ}$$Cの高温下でも安定性を示したことから、Csトラップ材として機能を有することが分かった。

We are developing a fuel coating material with a Cs capture function in anticipation of reducing the exposure dose of HTGR plants, improving safety in the event of a primary reactor accident, making the plant more compact and reducing construction costs due to the reduction of shielding wall thickness. Bi and Sb were selected as Cs getter materials. Their simulated Cs trap compounds were formed in the carbon structure and high temperature stability at 1500$$^{circ}$$C was evaluated. Although Bi was precipitated in carbon, the formation of Cs compounds could not be seen. Sb formed a Cs compound (Cs$$_{3}$$Sb, etc.) in carbon structure and showed stability at 1500$$^{circ}$$C. Therefore, it was found that Sb has a Cs trap function.

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