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An Empirical correlation to predict the distance for fragmentation of simulated Molten-Core materials discharged into a sodium pool

ナトリウム中へ流出した溶融炉心模擬物質のデブリ化距離に関する実験相関式

松場 賢一; 磯崎 三喜男; 神山 健司; 鈴木 徹; 飛田 吉春

Matsuba, Kenichi; Isozaki, Mikio; Kamiyama, Kenji; Suzuki, Toru; Tobita, Yoshiharu

ナトリウム冷却高速炉の炉心損傷時に原子炉容器下部プレナムへ流出した溶融炉心物質がデブリ化するまでの距離の評価を目的として、溶融炉心模擬物質を冷却材中へ放出させる試験を行い、デブリ化距離と流出条件の関係を実験相関式として整理した。実験相関式による予測は実験結果とよく一致した。本研究により、冷却材の沸騰・膨張によるデブリ化促進効果を考慮することで、ナトリウム中におけるデブリ化距離を適切に評価可能であることがわかった。

In order to evaluate the distance for fragmentation of molten core material discharged into the lower sodium plenum during core disruptive accidents in sodium-cooled fast reactors, experiments with simulated molten materials and coolants (water, sodium) was carried out, where an empirical correlation of the distance for fragmentation was developed. The empirical correlation developed by this study showed a good agreement with the measurement results obtained by the present experiments. It was found that in order to well-predict the distance for fragmentation in sodium, thermal phenomena, such as sodium boiling and resultant vapor expansion, needed to be considered.

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