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高速炉燃料被覆管の液体Na中質量移行モデル計算

Modelling and numerical calculation of mass transfer phenomena between fast reactor fuel cladding tube and liquid Na

大塚 智史   ; 丹野 敬嗣  ; 岡 弘   ; 矢野 康英  ; 上羽 智之 ; 皆藤 威二 ; 古川 智弘  ; 加藤 章一 

Otsuka, Satoshi; Tanno, Takashi; Oka, Hiroshi; Yano, Yasuhide; Uwaba, Tomoyuki; Kaito, Takeji; Furukawa, Tomohiro; Kato, Shoichi

高速炉長寿命燃料用ODS鋼被覆管の想定使用温度は最高約700$$^{circ}$$Cと高温であり、このような高温環境では冷却材の液体Na中の鋼材構成元素の溶解度が高まる結果、溶質元素の質量移行(溶出、沈着、拡散侵入)が生じることが報告されている。質量移行事象の駆動力は、被覆管と液体Na中の元素の化学ポテンシャル差と考えられるが、化学ポテンシャル差は温度だけでなくNa中不純物濃度など複数の因子に依存するため、実験データを適切に評価し、実機での事象を予測するためには、試験温度と試験時間以外の因子の影響も考慮する必要がある。本研究では被覆管の主要構成元素であるCrに着目し、Crの溶出事象のモデル化と数値計算を実施した。

Maximum temperature of ODS steel cladding tube for long life fast reactor fuel is very high (approximately 700$$^{circ}$$C) in normal operation condition. It was reported that, in reactor operation, mass transfer phenomena (dissolution, deposition, penetration) took place as a result of increased solubility of steel constituent elements in liquid Na. The driving force of these phenomena is the chemical potential gap of solute elements in steel and liquid Na, which is dependent of not only temperature but also other factors such as impurity concentrations in Liquid Na. For appropriately evaluating experimental data and predicting the corrosion behavior in actual plant, it is required to list up the key factors including other factors than temperature and residence time and understand the effects of these factors. In this study, transfer behavior of Cr (main alloying element of ODS steel) is discussed; modelling and numerical calculation were carried out on Cr dissolution behavior from fast reactor fuel cladding tube into liquid Na.

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