Thermo-fluid-solid Coupling Analysis of Hot Water Pipeline in Nuclear Reactor based on Finite Element Method

In order to research on the mechanical performance and insulation performance of the pipeline in nuclear reactor water system, a three - dimensional thermofluid-solid coupling model was established. Then the pipeline’s performances of different boundary conditions were compared, and the temperature field and stress field distribution wer analyzed based on the finite element method. The results show that: when the pipe support spacing increases from $5 \mathrm{~m}$ to $15 \mathrm{~m}$, the maximum stress of the pipeline increases by 2.1 times, and the radial displacement of the pipeline increases by 65.7 times when the thickness of the insulation layer increases from $80 \mathrm{~mm}$ to $150 \mathrm{~mm}$, the temperature gradient of the pipe section decreases along the radial direction, and the minimum temperature of the outer wall of insulation layer drops from $284.7 \mathrm{~K}$ to $277.6 \mathrm{~K}$, et al.