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Experimental discussion on fragmentation mechanism of molten oxide discharged into a sodium pool

ナトリウム中へ流出する溶融酸化物の微粒化メカニズムの実験的検討

松場 賢一; 神山 健司; 豊岡 淳一; 飛田 吉春; Zuyev, V. A.*; Kolodeshnikov, A. A.*; Vassiliev, Y. S.*

Matsuba, Kenichi; Kamiyama, Kenji; Toyooka, Junichi; Tobita, Yoshiharu; Zuyev, V. A.*; Kolodeshnikov, A. A.*; Vassiliev, Y. S.*

ナトリウム中へ流出した溶融炉心物質の微粒化距離に関する評価手法開発の一環として、カザフスタン共和国国立原子力センターの炉外試験施設を利用した微粒化試験で得られたアルミナデブリの粒子径を分析した。デブリの平均粒子径は0.3mm程度であり、流体力学的不安定性理論から予測される粒子径と同程度であったが、理論から予測されるようなウェーバ数への依存性は見られなかった。この分析結果から、アルミナ融体表面の流体力学的不安定が十分に成長する前の段階で発生する局所的なナトリウムの沸騰・膨張が、アルミナ融体の微粒化を促進させたと考えられる。

To develop a method for evaluating the distance for fragmentation of molten core material discharged into sodium, the particle size distribution of alumina debris obtained in the FR tests was analyzed. The mass median diameters of solidified alumina particles were around 0.3 mm, which are comparable to particle sizes predicted by hydrodynamic instability theories such as Kelvin-Helmholtz instability. However, even though hydrodynamic instability theories predict that particle size decreases with an increase of Weber number, such the dependence of particle size on We was not observed in the FR tests. It can be interpreted that this tendency of measured mass median suggests that before hydrodynamic instabilities sufficiently grow to induce fragmentation, thermal phenomena such as local coolant vaporization and resultant vapor expansion accelerate fragmentation.

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