Whole core transport calculation for PWR analysis using leakage dependent SPH

To accurately calculate power distribution and other neutronic characteristics of PWR cores, the whole core heterogeneous transport calculation which explicitly treats individual cells will be required. The whole core calculation has been performed by using pin-by-pin SN nodal method with cell homogenized cross sections corrected by SPH factors. The cell homogenized cross sections are generated by cell heterogeneous assembly calculations at non-reflective boundary condition in order to take into account the spectrum interference effect of adjacent assemblies and reflectors. When non-reflective boundary condition is applied to the assembly calculation, the conventional SPH method does not work because the neutron leakage of heterogeneous system is not consistent with that of homogeneous system when the same albedo boundary condition is applied to both heterogeneous and homogeneous system. The new SPH method has been developed to have a consistency of the neutron leakage between cell-heterogeneous and homogeneous system and the applicability of the new SPH method is verified for the mini core calculation including UO2 and MOX assemblies. (author)