In fast reactor, the coolant flows into the inside of the fuel assembly through the inlet hole, so according to the design requirement, it is necessary to determine a suitable inlet hole model to make the pressure drop and velocity reasonably. In this paper, three hole models are researched and the distance of adjacent hole of every model is different. Based on the hydraulic test of fuel assembly in fast reactor, a simplification model of distribution header and assembly pin has been built. The computational fluid dynamic code—CFX was used to simulate the pressure field and velocity field of the assembly pin with k-e turbulence model. The results show when the distance of adjacent hole increases, the change of pressure and velocity in the hole area is gently, which makes little vibration. The research will be the reference for the following simulation work and assembly hydraulic test.

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