Accident tolerant fuel(ATF)cladding material is a new generation of nuclear fuel concept proposed after the Fukushima nuclear accident to improve the performance of fuel elements against severe accidents.Compared with the current Zr-4 alloy cladding material,ATF cladding material can resist the consequences of accidents for a long time,while maintaining or improving its performance under normal operating conditions.In this paper,based on the code FRAPTRAN-2.0 and two ATF cladding materials(FeCrAl and SiC),a transient analysis code of fuel rod performance for ATF cladding materials was developed by improving the thermalphysical model,mechanical behavior model and oxidation model of cladding materials.Then the fuel rods of the MT-1 experimental stand were used as the objects for the computational analysis of its LOCA condition,and the thermal-hydraulic transient response characteristics of ATF cladding materials under this condition are studied.The analysis results show that compared with the conventional Zr-4 alloy cladding,the ATF cladding material can not only reduce the peak cladding temperature(PCT)under LOCA,but also delay or prevent cladding failure.
Accident tolerant fuel(ATF)Loss of Coolant Accident(LOCA)FRAPTRAN-2.0Fuel performance
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