Abstract
The small modular reactor NuScale has completed Standard Design Approval of Nuclear Regulatory Commission review by good safety performance and it makes history with the first SMR to receive NRC design approval. In this paper, to ensure the safety of the fuel rod in steam generator tube failure, accident tolerant fuels are selected as candidates for the traditional fuel rod. The primary and second circuit of NuScale were modeled, and compared with standard data to ensure accuracy. Thermal hydraulics and fuel performance of ATFs at NuScale during SGTF are analyzed. The results show that the fuel centerline temperature lower by loading with Th0.923U0.077O2-SiC ATF system in the steady-state. Moreover, it can prolong the time for radiotoxicity to leak during SGTF. In short, the safety of NuScale is improved with the replacement of ATF fuel system.
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