In order to ensure the thermal safety of the spent fuel stored in an underground vertical shaft, an air current heat dissipation is simulated in CFD way using ANSYS FLUENT code. Forced convection heat dissipation is focused in the research. The air current in the shaft and the temperature distribution on the surface of the spent fuel canister are calculated. The result confirms the reliability and security of the spent fuel dry storage. Finally, based on the calculating result, a support structure is designed, and the storage position of the spent fuel canister in vertical shaft is discussed, to optimize the decay heat removal of the spent fuel, and to ensure the temperature measuring point is set in a reasonable position.

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