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蒸気発生器伝熱管内蓄水量評価モデルの開発,4; 単管実験によるデータ解析

Study on model development for liquid accumulation in steam generator U-Tube, 4; Data analysis on differential pressure

山崎 康平*; 大竹 浩靖*; 長谷川 浩司*; 長谷部 吉昭*; 山路 達也*; 小泉 安郎; 大貫 晃*; 西 弘昭*

Yamazaki, Kohei*; Otake, Hiroyasu*; Hasegawa, Koji*; Hasebe, Yoshiaki*; Yamaji, Tatsuya*; Koizumi, Yasuo; Onuki, Akira*; Nishi, Hiroaki*

上昇蒸気流と凝縮液膜流下流の共存する管内気液対向二相流実験を行った。加圧水型軽水炉(PWR)の中小破断冷却材喪失事故時の蒸気発生器(SG)U字管内上昇流側の蓄水挙動の機構解明と蓄水量評価モデルの開発を目的とした一連の研究の報告である。本報では、内径18mm、長さ4mの垂直単管内凝縮共存気液対向流現象の実験を行った。凝縮量を幅広くとれるよう、管壁伝熱抵抗の大きなポリカーボネート製試験流路から、伝熱抵抗の小さい真鍮管へ試験流路を変えた。今回の実験条件は比較的蒸気流速の速い条件が主であったため、凝縮液は全て上方へ流れる上向き環状二相流状態であった。測定された管路入口-出口間の圧力損失は、Lockhart-Martinelli二相流圧力損失計算法により求めた値とよく一致した。今後のパラメータ実験及び取得データ評価に向かって見通しを得ることができた。

Experiments of counter-current two-phase flow of upward steam flow and condensing downward film flow in a pipe were performed. The experiments were intended to examine water accumulation in steam generator U-tubes during intermediate and small break loss-of-coolant accidents of a pressurized water reactor. The inner diameter and the length of a test flow channel used in the experiments were 18 mm and 4 m, respectively. In the present experiments, the test tube was changed from the polycarbonate tube that had large heat transfer resistance to a bras tube that had low heat transfer resistance so as to cover wide range for the condensing film flow rate. Since the vapor velocity was large in present experiments, the condensate film flowed upward and flowed out from the top outlet of the test tube. A flow state in the test tube was upward annular two-phase flow. Pressure drop between the inlet ad the outlet of the test tube was well expressed with the Lockhart-Martinelli correlation for the two-phase flow pressure drop. The experimental results suggested to promise the possibility for data accumulation in the future.

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