Abstract
In this research, the possible influence of power uprate on the distribution characteristics of erosion-corrosion (E/C) wear sites is analyzed through the two-phase models. These models include the three-dimensional two-phase computational fluid dynamics (CFD) models and appropriate E/C models. Two boiling water reactor (BWR) are selected in the analytical works. Based on the simulation results, the present CFD models can precisely capture the two-phase phenomena within the piping system, which include centrifugal effect, gravitation effect and imbalance of phase and mass separation in a T-junction, etc. The appropriate E/C models coupled with the calculated two-phase flow structure can indicate the local distributions of severe E/C wear sites on the wall of fittings, which shows reasonable agreement with the plant measured results. With these models, the impacts of power uprate on the distribution characteristics of E/C wear sites can be investigated. Comparisons between the calculated results under 100%, 105%, and 110% power levels clearly reveal that the power uprate does not significantly affect the distribution characteristics of wear sites for the selected piping system, especially in the wear ranges.