Research on Neutronics Characteristics of Small Modular Super-Safe Gas-Cooled Reactor

 To analyze the neutronics characteristics of the small modular super-safe gas-cooled reactor, this paper investigates how some physical parameters, such as TRISO particle packing fraction and fuel enrichment, influence the burnup characteristics, based on the hexagonal prism fuel assembly model, using Monte Carlo procedure and ORIGEN procedure. The results show that the lifetime increases with the fuel enrichment and pitch-to-diameter ratio, and is influenced by the diameter of fuel rod, the packing fraction and size of TRISO particles to a certain extent, while the effect of the TRISO particle coating layer thickness on the lifetime can be neglected. Based on the above results, a preliminary core loading scheme for the reactor is proposed, which meets the requirement of a 20-year lifetime without refueling.