A Preliminary Application of the GPS Correction to Pin-by-Pin 2-Step PWR Depletion

摘要

The applicability of the GPS functions to different temperature and burnup conditions was investigated. First, the UOX-loaded small PWR cores with three different conditions, HFP, HZP, and CZP, were analyzed with given GPS functions obtained from HFP conditions. Based on the implementation of given GPS correction on the different temperature conditions, it can be concluded that the GPS method has minor temperature dependency since the change of XS-dependent SPH factor is parameterized by the change of CFR information in the GPS functionalization. The temperature effect is already considered by the pin-wise group constants from TH-coupling. Second, the given GPS functions obtained from BOC HFP condition was applied to the pin-wise macroscopic depletion. In terms of eigenvalue, the GPS correction enhances the accuracy. Based on the pin-power error distribution, however, the burnup-independent GPS functions are not very reliable in the pin-wise depletion calculation. Burnup-dependent GPS functions should be considered for improved pin-wise depletion analyses.