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Approximate estimation of effective delayed neutron fraction with correlated sampling method

相関サンプリング法を用いた実効遅発中性子割合の近似的評価

長家 康展  ; 中島 健*

Nagaya, Yasunobu; Nakajima, Ken*

実効遅発中性子割合(通常$$beta_mathrm{eff}$$)は原子炉の動特性において非常に重要なパラメータである。この実効遅発中性子割合をモンテカルロ法で評価するために、固有値比法に摂動モンテカルロ法の一つである相関サンプリング法を適用した。提案した手法を検証するため、その手法をMVPコードに組み込み、TCAで測定された実効遅発中性子割合を計算した。この結果、今回提案した手法は、名内らやMeulekampらによる手法と同様、よい精度で実効遅発中性子割合を計算できることがわかった。

It is needless to say that the effective delayed neutron fraction, which is commonly denoted as $$beta_mathrm{eff}$$, is a very important parameter in reactor kinetics. To estimate the effective delayed neutron fraction in Monte Carlo calculations, we have applied the correlated sampling method, which is one of the Monte Carlo perturbation techniques, to the $$k$$-ratio method. To verify the proposed methods, we have implemented them into the MVP code and performed a calculation for the effective delayed neutron fraction measured at TCA. It is found that the proposed methods give a good estimate for the effective delayed neutron fraction as well as Nauchi's and Meulekamp's methods.

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