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Sensitivity analysis for neutron multiplication parameters of accelerator driven subcritical system

加速器駆動未臨界体系の中性子増倍パラメータに対する感度解析

千葉 豪; 西原 健司; 遠藤 知弘*

Chiba, Go; Nishihara, Kenji; Endo, Tomohiro*

未臨界系の中性子増倍を記述する核特性パラメータの核断面積に対する感度解析を行った。未臨界増倍率$$k$$$$_{rm sub}$$と、本研究で新たに定義した世代ごと中性子増倍率$$k$$$$_{i}$$の感度を計算し、従来用いられている実効増倍率$$k$$$$_{rm eff}$$の感度との比較を行った。その結果、$$k$$$$_{rm sub}$$及び世代数が小さいときの$$k$$$$_{i}$$の感度が$$k$$$$_{rm eff}$$に対する感度と大きく異なることを示した。これより、固有値方程式の解に着目した従来の感度解析では未臨界系の核特性を把握するには不十分であり、実際の中性子増倍を記述する核特性パラメータの感度解析が必要であることがわかった。

Sensitivity calculations are carried out for some neutronic parameters on neutron multiplication in subcritical systems. Sensitivities of the subcriticality multiplication rate $$k$$$$_{rm sub}$$ and the generation-wise neutron multiplication rate $$k$$$$_{i}$$, which is a new neutronic parameter proposed in the present paper, are calculated, and these sensitivities are compared with the $$k$$$$_{rm eff}$$ sensitivities which have been conventionally used for sensitivity works. The present sensitivity calculations show that the sensitivities of $$k$$$$_{rm sub}$$ and $$k$$$$_{i}$$ in small values of $$i$$ are significantly different from the $$k_{eff}$$ sensitivities. This result indicates that the sensitivity analyses focusing only on the solution of the eigenvalue equation cannot provide full information on the core properties of subcritical systems, and that the sensitivities of the other neutronic parameters describing real neutron multiplication are essential.

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