New Control Rod Homogenization Method for Fast Reactors
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概要
- 論文の詳細を見る
A new homogenization method of control rod assemblies has been developed to accurately calculate control rod worth in fast reactors. In this method, the homogenized cross sections are defined so as to preserve the reaction rate ratio between a control rod region and a surrounding fuel region in a supercell model before and after homogenization. This new method has an advantage that the cross section of adjacent fuel assemblies is not necessary to change. From supercell calculation, this method produced k∞ values which agreed with the reference heterogeneous calculation within 0.2%Δk. The flux weighting method underestimated k∞ up to 1.4% Δk and the reaction rate preservation method did not produced a converged cross section.<BR>In the verification test of core calculation in RZ geometry, we confirmed that the reaction rate ratio preservation method is more accurate than the flux weighting method for control rod worth calculations.<BR>It was found from core calculations that the control rod worth obtained by the flux weighting method is overestimated compared to that by the reaction rate ratio preservation method by about 3%. This overestimation is remarkable for a safety rod with 90 w t % enriched 10B than for a shim rod with 40 wt% enriched 10B.
著者
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Kitada Takanori
Department Of Nuclear Engineering Graduate School Of Engineering
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Takeda Toshikazu
Department of Nuclear Energy, Graduate School of Engineering, Osaka University
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HOJUYAMA Takeshi
Mitsubishi Atomic Power Industries, Incorporated
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HOJUYAMA Takeshi
Mitsubishi Atomic Power Industry, Inc.
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KOSAKA Shinya
Department of Nuclear Engineering, Faculty of Engineering, Osaka University
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YANO Mari
Mitsubishi Atomic Power Industry, Inc.
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TAKEDA Toshikazu
Department of Nuclear Engineering, Faculty of Engineering, Osaka University
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