Impact of system parameters on quenching heat transfer in the candidate materials for accident tolerant fuel-cladding in LWRs

Abstract

We investigated a potential impact of the candidate materials (FeCrAl, SiC-CVD, and Zry-4) for the Accident Tolerant Fuel-cladding (ATF) in the quenching heat transfer according to the system parameters such as liquid subcooling, pressure, and flooding rates. Results obtained by water quenching experiment and system code analysis using MARS 3D-VESSEL are presented that the quenching heat transfer including the post-CHF parameters (i.e., minimum film-boiling temperature) is more influenced by the system parameters compared to change of the cladding materials. Current models of minimum film-boiling temperature in system code are also discussed for the application of ATF and its oxidation. Select option in the model library is proposed to consider the surface parameters using weighting term in thermal-hydraulic system code.