FBRのULOF時における溶融炉心プール挙動の3次元シミュレーション

Three-dimensional simulation of molten core pool in a ULOF event in FBR

山野 秀将  ; 飛田 吉春; 佐藤 一憲 

Yamano, Hidemasa; Tobita, Yoshiharu; Sato, Ikken

3次元安全解析コードSIMMER-IVによって、従来の2次元解析では取り扱えなかった実際の集合体配位を適切に模擬できると同時に、崩壊炉心物質の3次元的な運動を現実的に評価できることを確認した。また、制御棒案内管の冷却効果が燃料凝集による再臨界発生を抑制させる可能性を示した。

The present study has confirmed that three-dimensional safety analysis code SIMMER-IV could realistically evaluate a three-dimensional motion of degraded core materials and appropriately simulate an actual fuel assembly configuration that had not been addressed by conventional two-dimensional analyses. It has been shown that a cooing effect of control rod guide tubes has a possibility to supress recriticality occurrence due to fuel compaction.