부산대학교 도서관

SACOS series of subchannel analysis codes have been developed by XJTU-NuTheL for many years and arebeing used for the thermal-hydraulic safety analysis of various reactor cores. To achieve fine whole corepin-level analysis, the input preprocessing and parallel capabilities of the code have been developed inthis study. Preprocessing is suitable for modeling rectangular and hexagonal assemblies with less errorprone input; parallelization is established based on the domain decomposition method with the hybridof MPI and OpenMP. For domain decomposition, a more flexible method has been proposed which candetermine the appropriate task division of the core domain according to the number of processors of theserver. By performing the calculation time evaluation for the several PWR assembly problems, the codeparallelization has been successfully verified with different number of processors. Subsequent analysisresults for rectangular- and hexagonal-assembly core imply that the code can be used to model andperform pin-level core safety analysis with acceptable computational efficiency