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核設計精度向上のための拡張バイアス因子法

Extended bias factor method for improvement of prediction accuracy of neutronic characteristics

久語 輝彦 ; 森 貴正; 竹田 敏一*

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

実機核特性予測精度を向上させる拡張バイアス因子法を考案した。本手法は、複数個の累乗化した実験値の積により半仮想的に構成した実験値を用いる。これに対応する半仮想的な実験解析値との比をバイアス因子として、これを設計計算値に乗じた設計予測値の持つ誤差を最小化する方法である。

Extended bias factor method is proposed for improvement of the prediction accuracy of neutronic characteristics of a nuclear energy system. The present method utilizes a number of experimental results and produces a semi-fictitious experimental value by a product of exponentiated experimental values. A bias factor is defined a ratio of the product of exponentiated experimental values to a product of exponentiated calculation values correspoding to the experimental values. By multiplying the bias factor to a design calculation value, it is corrected into a design prediction value. Exponents are determined to minimize a variance of the design prediction value.

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