Experiment on Dynamic Water Corrosion of Accident Tolerant Fuel Cladding Materials in Hydrochemical Environment

In order to master the dynamic water corrosion resistance of accident tolerant fuel (ATF) cladding materials, a special bench was set up to simulate the thermal-hydraulic environment and water chemical environment of the core. The dynamic water corrosion tests were carried out for ordinary Zr alloy, Zr alloy coated with Cr metal coating, FeCrAl alloy and other ATF cladding candidate materials under the condition of empty tube and built-in electric heating rod. The results show that there was no obvious oxide film on the surface of the three cladding tube candidate materials after 28 days of corrosion in dynamic water in hydrochemical environment, indicating that each material had good short-term corrosion resistance. Compared with the empty tube condition, the granular oxidation products on the surface of Zr alloy and Zr alloy coated with Cr metal coating were denser and the oxidation resistance was better under the condition of built-in electric heating rod. Under the condition of empty tube and built-in electric heating rod, Zr alloy coated with Cr metal coating had better corrosion resistance than ordinary Zr alloy. However, under the condition of built-in electric heating rod, other phases were detected on the surface of both materials, which needed further study.