Simplified Treatments of Anisotropic Scattering in LWR Core Calculations
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概要
- 論文の詳細を見る
The validity of various simplified treatments of anisotropic scattering is investigated in typical LWR configurations that simulate PWR, BWR, and APWR. In addition to the explicit treatment of anisotropic scattering, the diagonal approximation of anisotropic scattering matrixes and the transport corrected cross section with the assumption of isotropic scattering are also tested. Calculation results indicate that the anisotropic scattering matrix of the P1 component would be explicitly treated to obtain accurate results in the present calculations. The P2 or higher order anisotropic scattering matrix could be approximated by the diagonal approximation while maintaining the calculation accuracy. In addition to the above investigation, the physical meaning of the transport corrected cross section used in a transport calculation is discussed through a simple one-group fixed-source benchmark problem with anisotropic scattering. Though the transport corrected cross section is usually used to consider the P1 scattering cross section, the calculation results and discussion clarify that the transport corrected cross section is not mathematically consistent with the consideration of the P1 scattering cross section. The transport corrected cross section always implicitly includes an infinite order of anisotropic scattering cross sections when it is used in a transport calculation. Since the higher order anisotropic scattering component tends to reduce neutron leakage from a core, the calculated k-effective with the transport corrected cross section would be overestimated. This suggests the cause of the overestimation of k-effective by transport calculation with the transport corrected cross section obtained by in-scatter approximation.
- 社団法人 日本原子力学会の論文
- 2008-03-25
著者
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KITAMURA Yasunori
Nagoya University
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山根 義宏
名古屋大学
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YAMAMOTO Akio
Department of Applied Chemistry, Graduate School of Science and Engineering, Waseda University
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YAMANE Yoshihiro
Department of Life Science, Faculty of Science, Himeji Institute of Technology
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Yamane Yoshihiro
Department Of Materials Physics And Energy Engineering Nagoya University
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Yamane Yoshihiro
Physics And Energy Engineering Department Of Materials Graduate School Of Engineering Nagoya Univers
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KITAMURA Yasunori
Department of Fundamental Energy Science, Graduate School of Energy Science, Kyoto University
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Yamane Yoshihiro
Department Of Nuclear Engineering Nagoya University
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Yamamoto Akio
Department Of Materials Physics And Energy Engineering Nagoya University
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Yamamoto Akio
Physics And Energy Engineering Department Of Materials Graduate School Of Engineering Nagoya Univers
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Kitamura Yasunori
Department Of Materials Physics And Energy Engineering Nagoya University
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Kitamura Yasunori
Department Of Applied Biology Faculty Of Textile Science And Technology Shinshu University
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Yamamoto Akio
Department Of Applied Chemistry Graduate School Of Science And Engineering And Advanced Research Cen
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