IMPROVED PWR RADIAL REFLECTOR MODELING WITH SIMULATE5

摘要

The recent improvements implemented in Studsvik's next generation code package CMS5, with CASMO5 and SIMULATE5, in modeling the PWR radial baffle/reflector is presented in this work. The shortcomings in the conventional approach of generating radial homogenized cross-sections and discontinuity factors from a 1D fuel/reflector transport calculation have been eliminated by re-computing the reflector node cross-sections and discontinuity factors in real core geometry by using the submesh calculation model in SIMULATES. The submesh constants for the radial reflectors are generated from either a 1D fuel/reflector transport calculation or a multi-assembly core transport calculation. The effects of radial reflector modeling on core eigenvalue and assembly power predictions are demonstrated for the BEAVRS benchmark problem.