A Fusion Technique of 2-D/1-D Methods for Three-Dimensional Whole-Core Transport Calculations

3-D heterogeneous transport calculation of OECD benchmark problem C5G7 MOX was performed with a fusion technique of 2D/1D methods: the method of characteristics (MOC) for radial 2-D calculation and the diamond difference (DD) scheme for axial 1-D calculation. We further save computer memory and computation time significantly by parallel computation and additive angular dependent rebalance (AADR) acceleration, rendering the 3-D whole-core transport calculation feasible.