Abstract
Since the development of offshore nuclear power platform, most of the equipment on the platform are pressurized water reactors, and a few are loaded with liquid metal cooled reactors. Liquid metal cooled reactor has higher fuel utilization and thermal efficiency. The core is the most important part of the reactor, and the fuel assembly is the source of energy in the core. Understanding the characteristics of fuel assembly is of great significance to ensure the safety of reactor core and even offshore nuclear power platform. The common fuel assembly in liquid metal reactor adopts hexagon. The existing research on the simplification of fuel assembly is relatively simple. It simplifies the fuel assembly as a whole and pays more attention to the overall stress. In this paper, a more refined simplification method in important parts is considered to reasonably simplify the fuel assembly, which can more accurately restore the assembly structure. At the same time, the effects of different simplification methods on the calculation results are compared, and the finite element model of hexagonal fuel assembly is established by ANSYS software, The natural frequency is calculated by modal analysis and compared with the existing experimental results. The conclusion can be well confirmed.
