Application of Multiband Method to Pin Cell Calculations.

概要

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In order to accurately calculate effective neutron cross sections in the resonance energy region, the multiband method has been applied to cell calculations. Cell calculations for UO2 and MOX fuels of light water reactors have been performed and the results were compared with those of a continuous energy Monte Carlo code VIM and the conventional self-shielding method using the Dancoff factor. The k∞ values calculated by the multiband method agreed with those of the VIM calculations within 0.20%Δk for the UO2 fuel cell and within 0.30%Δk for the MOX fuel cell, respectively, whereas the Dancoff factor method yielded about 1.1%Δk errors for the two cells. The elementwise contribution to this error was investigated, and it was found that the effective microscopic cross sections, particularly those for the giant resonances of 238U, calculated by the multiband method were in good agreement with those of VIM. It was also found that interference effect between 238U and 235U resonances in the UO2 fuel and that between 238U and 239Pu resonances in the MOX fuel made about 0.20% Δk contributions to k∞ in both fuel cells.
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