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3D Transport Theory Method Based on MOC for Analyzing Integral Dta of Transmutation

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竹田 敏一*; 浜田 譲*; 北田 孝典*; 西 裕士; 石橋 淳一; 北野 彰洋

Takeda, Toshikazu*; Hamada, Yuzuru*; Kitada, Takanori*; Nishi, Hiroshi; Ishibashi, Junichi; Kitano, Akihiro

燃料集合体の非均質性を考慮した3次元輸送計算方法として、Characteristics法を導入した計算手法の開発を進めている.本研究では、計算時間・メモリ容量の制約から、軸方向に対してはノード法による輸送計算を行ない、径方向については2次元Characteristics法を適用することで3次元化を図ることを目指す。今回はその前段階として、FBR部分炉心を対象に2次元Characteristics法とモンテカルロ法との計算結果を比較し、高速炉体系への2次元計算の適用性について検証した。計算結果より、両者はよく一致し、2次元Characteristics法の適用性を確認した。

A new 3-D transport calculation method taking into account the heterogeneity of fuel assemblies has been developed by combining the characteristics method and the nodal transport method. In the axial direction the nodal transport method is applied, and the characteristics method is applied to take into account the radial heterogeneity of fuel assemblies. The numerical calculations have been performed to verify 2-D radial calculations of FBR assemblies and partial core calculations. Results are compared with the reference Monte-Carlo calculations. A good agreement has been achieved. It is shown that the present method has an advantage in calculating reaction rates in a small region.

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