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臨界事故における最臨界及び再回復までの長時間出力挙動

Long time power profile until re-criticality and recovery of power in criticality accident

山根 祐一 

Yamane, Yuichi

核燃料溶液などで臨界事故が生じたとき、出力は最大に達した後、振動しながらも徐々に単調減少に転じる。その後、再び臨界となって出力が上昇に転じるまでの時間及び出力が冷却能力で決まる一定の値まで回復するまでの時間を最高温度や冷却能力の関数で表す式を導出したところ、TRACYの実験値をよく再現した。

After criticality accident occurred at nuclear fuel solution, the fission power increases to its maximum then decreases monotonically. An equation was derived for the time interval between re-criticality and recovery of the power. The evaluated results show good agreement to experimental data.

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