Applicability of the Diffusion and Simplified P3 Theories for Pin-by-Pin Geometry of BWR

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概要

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• The pin-by-pin fine-mesh core calculation method is considered as a candidate next-generation core calculation method for BWR. In this study, the diffusion and simplified P3 (SP3) theories are applied to the BWR pin-by-pin fine-mesh calculation. The performances of the diffusion and SP3 theories for cell-homogeneous pin-by-pin fine-mesh calculation for BWR are evaluated through comparison with a cell-heterogeneous detailed transport calculation by the method of characteristics (MOC). Two-dimensional, 2×2 multi-assemblies geometry is used to compare the prediction accuracies of the diffusion and SP3 theories. The 2×2 multi-assemblies geometry consists of 9×9 UO2 fuel assemblies that have two different enrichment splittings. To minimize the cell-homogenization error, the SPH method is applied for the pin-by-pin fine-mesh calculation. The SPH method is a technique that reproduces a result of heterogeneous calculation using that of homogeneous calculation. The calculation results indicated that the diffusion theory shows a discrepancy larger than that of the SP3 theory on the pin-wise fission rate distribution. In contrast to the diffusion theory, the SP3 theory shows a much better accuracy on the pin-wise fission rate distribution. The computation time using the SP3 theory is about 1.5 times longer than that using the diffusion theory. The BWR core analysis consists of various calculations, e.g., the cross section interpolation, neutron flux calculation, thermal hydraulic calculation, and burn-up calculation. The function of the calculation time for the neutron flux calculation is usually less than half in the typical BWR core analysis. Therefore, the difference in the calculation time between the diffusion and SP3 theories would have no significant impact on the calculation time of the BWR core analysis. For these reasons, the SP3 theory is more suitable than the diffusion theory and is expected to have sufficient accuracy for the 2×2 multi-assemblies geometry used in this study, which simulates a typical situation of the actual BWR core.

• 2008-10-01

著者

• YAMAMOTO Akio

  Nagoya University

• YAMANE Yoshihiro

  Nagoya University

• TADA Kenichi

  Nagoya University

• KITAMURA Yasunori

  Nagoya University

• 山根 義宏

  名古屋大学

• Yamane Yoshihiro

  Department Of Materials Physics And Energy Engineering Nagoya University

• Yamane Yoshihiro

  Physics And Energy Engineering Department Of Materials Graduate School Of Engineering Nagoya Univers

• Yamane Yoshihiro

  Department Of Nuclear Engineering Nagoya University

• Yamamoto Akio

  Department Of Materials Physics And Energy Engineering Nagoya University

• Tada Kenichi

  Physics And Energy Engineering Department Of Materials Graduate School Of Engineering Nagoya Univers

• Yamamoto Akio

  Physics And Energy Engineering Department Of Materials Graduate School Of Engineering Nagoya Univers

• Kitamura Yasunori

  Department Of Materials Physics And Energy Engineering Nagoya University

• Yamamoto Akio

  Nagoya Institute Of Technology

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