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

抄録

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.