Effects of Mutual Shielding on Resonance Integrals of 235U, 239U, 239Pu and 240Pu below 150 eV

概要

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The results of some quantitative studies on resonance interference are presented. The calcu-lations were performed on a FORTRAN IV program RICM2, which solves numerically the slow-ing down of neutrons over many resonance levels in a two region lattice, and gives reaction rates, average cross sections and effective resonance integrals of the nuclides concerned. Three combinations of resonant nuclides, 235U-238U, 239Pu-238U and 239Pu-240PU, were considered, in conjunction with three oxide fuel rod radii, 0.2, 0.5 and 2.0 cm, the moderator (light water) to fuel volume ratio being maintained constant at 2.0. An energy range below 150eV has been covered by the present calculations. The effects of resonance interference have been found to be appreciable in this energy range.
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