3-D Whole-Core Transport Calculations of the Extended OECD Benchmark Problem C5G7 MOX by the CRX Code, invited

摘要

Recently, a 2D/1D fusion method for 3-D whole-core transport calculation was proposed by the authors. The 2D/1D fusion method is a synergistic combination of the method of characteristics (MOC) for radial 2-D calculation and the S_N -like method for axial 1-D calculation. This approach takes advantages of the structure of a core that is usually simpler in axial direction than in radial direction. Each solver sends and receives interface angular fluxes and thus requires some iterations. However, this approach requires much less memory and computing time resulting in overall efficiency, than would be required by a direct 3-D MOC. Although direction extension of the MOC to 3-D transport calculation is possible, it is limited at present only to assembly-size problems. The 2D/1D fusion method has been implemented in the CRX code and the results for the original configuration of the OECD benchmark problem C5G7 MOX in 2-D and 3-D cases were presented elsewhere. [3] In this paper, we present some results for the new configurations of the extended C5G7 MOX benchmark problem recently released by OECD/NEA. The extended benchmark problem is designed to consist of assemblies with control rods inserted at several depths so that heterogeneity and 3D effects are more pronounced.