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- W68698939 abstract "Fast breeder reactors (FBRs) have a tighter neutronic coupling than light water reactors, and the point kinetic approximation is used for kinetic calculations for small and homogeneous FBR cores. The coupling of large heterogeneous FBR cores becomes looser than that of small and homogeneous cores, however, and the flux distribution change caused by a local reactivity change is more significant. Therefore, the three-dimensional kinetic calculation is necessary to treat insertion or withdrawal of off-center control rods for such cores. The authors have created a three-dimensional (hexagonal-z) kinetic code KICOM using the improved quasi-static approximation for the solution of the multigroup space-time-dependent diffusion equation and the improved coarse-mesh method to accurately calculate the shape function. In static calculation, it was shown that eigenvalue, control rod worth, and power distribution calculated by this method are close to the values given by triangular-z (six points per one hexagonal) calculations and the CPU time is no less than twice the hexagonal-z (one point per one hexagonal) calculation. The space mesh effect was estimated for FBR kinetic calculations by comparing the results between the kinetic code using the conventional coarse meshing (one point per one hexagonal) and the present improved coarse-mesh method calculation." @default.
- W68698939 created "2016-06-24" @default.
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- W68698939 date "1990-06-01" @default.
- W68698939 modified "2023-09-24" @default.
- W68698939 title "Three-dimensional kinetic calculations with improved coarse-mesh method for fast reactors" @default.
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