Spent fuel dry storage system,with the advantages of safety,economy,and flexibility,is one of the research hotspots in the field of nuclear industry.In this study,the horizontal storage module(HSM)of the spent fuel storage system is taken as the research object,and a three-dimensional natural convection heat transfer model of the 1/2 scale model of the concrete module and the storage container is established by using the physical modeling method combining the conjugate heat transfer technology of computational fluid dynamics(CFD)with porous media,and the flow and heat transfer process in the module is numerically simulated in the Fluent solver.The results show that:the shrinkage structure design at the bottom of the concrete module leads to a sharp increase of the airflow velocity at the inlet section,and the maximum flow velocity is 1.98 m/s.The thermal shielding plate in the concrete module can effectively reduce the temperature of the concrete.The high-temperature area is distributed in the upper part of the back wall of the internal chamber,and the maximum temperature is 108.05 ℃.The temperature of the fuel assembly shows a symmetric distribution in the axial and horizontal radial direction,and the maximum temperature is 321.97℃.The natural convection heat exchange in concrete module accounts for 82.3％of the total heating power,and its structural design has good heat removal ability.This study will provide important references for scaling experiments and prototype design of spent fuel dry storage systems.
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