More information on the differences of SVRW between BFS-62-3A and BN-600 hybrid core, Appendix 10

In the PHYSOR2004 paper by A.SHONO, it is described that temperature is a major reason of the differences in region-wise SVRW values between BFS-62-3A and BN-600 hybrid core. The effect of temperature on the SVRW was evaluated by changing temperature in the BFS-62-3A benchmark model to those specified in the BN-600 hybrid core benchmark model. Calculation were based on heterogeneous cell calculation in fuel zones, and SVRW in BN-600 hybrid core was calculated by voiding 60 degree sector as in BFS-62-3A. There is a small difference in the way to calculate SVRW in the perturbation analysis. In BN-600 cases, regions located inside the voided region were not voided, and the core before perturbation was always before voiding. This causes little difference on the results as confirmed in the IAEA CRP 5th meeting. Results are summarized in Table 1, in a similar form presented in Action 5.12v1. Concerning the Na density correction, the ratios of the Na weights were used in the previous note. The true values shown is used in this note. The non-leakage and scattering (or slowing down) components are compared, for LEZ and MOX region, respectively. The Na density correction was applied to the BFS-62-3A results. Adjoint and forward neutron fluxes are compared for the two regions