System Code Evaluation of Accident Tolerant Claddings during BWR Station Blackout Accident

摘要

In this work, the performance of two near term ATF claddings: monolithic FeCrAl cladding and Cr-coating are assessed using a generic BWR TRACE model under the condition of three SBO scenarios. TRACE code is modified to reflect the state-of-the-art oxidation kinetics of FeCrAl. Both ATF claddings have shown improved safety responses compared to conventional Zircaloy cladding. More specifically, the coping time is improved and the mass of hydrogen generation is significantly reduced when the cladding starts to melt and when the cladding is completely oxidized. However, the gain in coping time is only marginal.