鉛ビスマス共晶合金(LBE)利用技術に関する研究; 熱流動関連研究開発

Research Work for Utilizing Technology of the Lead-Bismuth Eutectic; Thermal-hydraulic Research Work

堺 公明; 江沼 康弘  ; 惣万 芳人; 西 義久*; 木下 泉*

Sakai, Takaaki; Enuma, Yasuhiro; Soman, Yoshindo; Nishi, Yoshihisa*; Kinoshita, Izumi*

鉛-ビスマス冷却自然循環炉の蒸気発生器伝熱管破損事故時の熱流動特性について、動特性解析を実施するとともに、鉛-ビスマス冷却材中の気泡挙動に関する試験を実施し、気泡により連行される鉛ビスマス流量およびボイド率の評価式を検証した。その結果、伝熱管破損時にも十分な冷却性が確保されることが明らかになった。

In System analysis has been performed to evaluate the thermal-hydraulics effect of the tube rapture accident. In addition, lifted flow rate by gas injection in the lead-bismuth has been measured to confirm the applicability of existing void fraction correlations based on the drift-flux model by Zuber-Findlay. As a result, it is clarified that the cooling capability is successfully maintained also in case of the tube rapture accident, because the flow reversal is limited to only 1/8 sector of downward flow area due to the tube support wall structure in the steam generator. And also, the applicability of existing void fraction correlations to Lead-Bismuth is confirmed by the gas injection experiment.