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Application of bias factor method with use of virtual experimental value to prediction uncertainty reduction in void reactivity worth of breeding light water reactor

水冷却増殖炉のボイド反応度価値における予測誤差低減に対する仮想実験値を用いたバイアス因子法の適用

久語 輝彦; 森 貴正; 小嶋 健介; 竹田 敏一*

Kugo, Teruhiko; Mori, Takamasa; Kojima, Kensuke; Takeda, Toshikazu*

MOX燃料稠密格子軽水炉のためにFCA22-1炉心を用いた臨界実験結果を活用して、水冷却増殖炉のボイド反応度価値の予測誤差の低減を評価した。本研究では、仮想実験値として累乗化した実験値を用いてバイアス因子法を拡張した。この拡張による実機炉心特性の予測誤差の低減について定式化した。数値計算の結果、本概念により誤差が低減することが示された。本概念の導入は、実験データを有効に活用するとともに、バイアス因子法の適用方法を拡張するものであると結論づけられる。

Utilizing the critical experiments for MOX fueled tight lattice LWR cores at FCA XXII-1 cores, we have evaluated prediction uncertainty reduction in coolant void reactivity worth of a breeding LWR core based on the bias factor method. In the present study, to extend the applicability of the bias factor method, we have introduced an exponentiated experimental value as a virtual experimental value and formulated the prediction uncertainty reduction with the bias factor method extended by the concept. From the numerical evaluation, it has been shown that the prediction uncertainty due to cross section errors has been reduced by the use of the concept of the virtual experimental value. It is concluded that the introduction of virtual experimental value can effectively utilize experimental data and extend applicability of the bias factor method.

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