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KUCA未臨界炉心の反応度評価,2; 準静的状態の出力挙動に基づく評価

Reactivity estimation of KUCA subcritical cores, 2; Estimation based on power profile in quasi-steady state

山根 祐一  ; 荒木 祥平   ; 北村 康則*; 三澤 毅*

Yamane, Yuichi; Araki, Shohei; Kitamura, Yasunori*; Misawa, Tsuyoshi*

反応度評価手法の比較のため、KUCAのA架台を用いて複数の互いに異なる未臨界炉心を構成し、既存の手法及び新たに開発した手法を適用して反応度を評価した。臨界に近い炉心に対して、準静的状態の出力挙動に基づいて評価した反応度(E)は、MVPによる計算値(C)に対してC/E=0.9$$sim$$1.5程度であった。

A new reactivity estimation method has been developed based on the power profile in quasi-steady state. Several subcritical cores were set up in KUCA A-core and neutron count rate was measured to apply estimation methods for comparison. The values obtained by new method, E, in an near-critical core and calculated value by using MVP code, C, show C/E in the range between 0.9 and 1.5.

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