混合固体粒子の堆積挙動に関する実験的研究

Experimental study on sedimentation behavior of mixed solid particles

Son, E.*; Sheikh, Md. A. R.*; 松元 達也*; 守田 幸路*; 松場 賢一  ; 豊岡 淳一  ; 田上 浩孝 ; 神山 健司  

Son, E.*; Sheikh, Md. A. R.*; Matsumoto, Tatsuya*; Morita, Koji*; Matsuba, Kenichi; Toyooka, Junichi; Tagami, Hirotaka; Kamiyama, Kenji

高速炉の炉心損傷事故時に溶融燃料と冷却材との相互作用により形成される燃料デブリの落下・堆積挙動を明らかにするため、燃料デブリを模擬した特性の異なる固体粒子を水プールに落下させる堆積挙動実験を実施し、実験パラメータが粒子ベッドの形成特性に及ぼす影響を調査するとともに、粒子径の異なる混合粒子のベッド中心部高さを定量的に評価する整理式を作成した。整理式による予測値は実験値と良く一致していることから、粒子径の異なる混合粒子のベッド中心高さの予測に対する整理式の適用性を確認できた。

To clarify the sedimentation behavior of fuel debris particles formed by molten fuel-coolant interaction in core disruptive accidents of sodium-cooled fast reactors, experiments pouring mixed particles simulating fuel debris into a water pool were conducted. In the experiments, effects of experimental parameters on the characteristics of particle bed formation were investigated. Based on the results of the experiments, an empirical correlation to predict quantitatively the center height of the bed composed of mixed particles with different sizes was developed. Bed height predicted using the correlation agreed well with the experimental results. Applicability of the developed correlation to the prediction of the center height of the bed composed of mixed particles with different sizes was confirmed.