Three-Deimsnional Two-Group Finite-Difference Diffusion Equation Solver for CANDU-PHWR Analysis, FDM3D

Abstract

FDM3D is a three-dimensional(3-D) two group finite difference method diffusion equation solver adopting accelerated iterative schemes such as successiveoverrelaxation(SOR) or bi-conjugate gradient stabilization method(BICG-STAB) method as inner iteration schemes and Chebyshev two-parameter method or Wielant method as outer iteration schemes. It is designed to achieve an improved efficiency of the CANDU-PHWR analysis by the current RFSP code. For the efficiency test of FDM3D code, the FDM3D with SOR/Chebyshev two-parameter schemes is incorporated into the RFSP code and the benchmark problems have been analyzed by using the physics test data [6] of Wolsong units 2 and 3 and the calculation results of CANFLEX-NU physics design. It is shown that the FDM3D can reduce the CPU time of the current RFSP by 2 to 5 times.