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Covariance evaluation of self-shielding factor and its temperature gradient for uncertainty evaluation of doppler reactivity

ドップラー反応度の評価のための自己遮蔽因子とその温度勾配の共分散評価

大塚 直彦; 瑞慶覧 篤*; 高野 秀機*; 千葉 豪; 石川 眞

Otsuka, Naohiko; Zukeran, Atsushi*; Takano, Hideki*; Chiba, Go; Ishikawa, Makoto

ウラン238の中性子捕獲断面積の自己遮蔽因子とその温度勾配の共分散を共鳴パラメータがこれらの物理量に対して持つ感度から、JFS-3 70群に関して求めた。得られた結果は共鳴パラメータ間の相関が自己遮蔽因子やその共分散に対して有意な影響を与えることを示した。

Covariances of the self-shielding factor and its temperature gradient for the uranium-238 neutron capture reaction have been evaluated from the resonance parameter covariance matrix based on the sensitivity coefficients of the self-shielding factor and its temperature gradient to the resonance parameters. The present result shows that the correlation among resonance parameters yields a substantial contribution to the standard deviations of the self-shielding factor and its temperature gradient.

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