Unified diffusion coefficient for analysis of sodium-void worth in fast critical assembly with control-rod channels.
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概要
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A unified diffusion coefficient which is applicable not only to fuel drawers but also to sodium followers or control-rod drawers has been derived by extending the Benoist method to analyze the sodium-void worths in fast critical assemblies including singularities such as sodium followers and control-rod drawers. The unified diffusion coefficient has been obtained by calculating average neutron leakage rates in perpendicular and parallel directions in a super-cell consisting of different drawers such as fuel drawers and sodium followers by using transport theory. Then the interference effect of the neutron streaming between different drawers on diffusion coefficients is taken into account. Diffusion coefficients of fuel drawers, sodium followers and control-rod drawers contained in the ZPPR-3 modified phase 3 core have been calculated on the basis of the present method, Benoist's method, Seki & Sasaki's method and the conventional method, and the results have been compared. The applicability of the unified diffusion coefficient to sodium-void worth calculations has been checked in one- and two-dimensional test geometries, and it has been found that the use of the unified diffusion coefficient leads to reasonable results without adopting the transport corrections in the models including sodium followers. Further the sodium-void worths in the ZPPR-3 modified phase 3 core have been analyzed using the unified diffusion coefficient.
- 一般社団法人 日本原子力学会の論文
著者
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Arai Kenji
Department Of Biology Faculty Of Education Saitama University
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Takeda Toshikazu
Department of Nuclear Energy, Graduate School of Engineering, Osaka University
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YAMAOKA Mitsuaki
Department of Nuclear Engineering, Faculty of Engineering, Osaka University
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ARAI Kenji
Department of Nuclear Engineering, Faculty of Engineering, Osaka University
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