LAUSR

Abstract The spent fuel storage racks are placed freely inside a pool that is filled with water. Under seismic condition, the fluid in the gap between the racks will be forced to flow due to the movement of the racks. Inversely, the fluid may impose an added mass to the rack and affect the movement of the racks. The added mass imposed to the rack in this kind of fluid-structure interaction phenomenon (FSI) is very important for the dynamic analysis of racks. Previous researches on rack mainly focus on theoretical analysis and numerical simulation. Due to the complexity of the structure, application of the theoretical analysis is limited, while the effectiveness of numerical method need to be validated by experiments. In order to develop an added mass model for rack with end-tube-connection construction like CAP1400 spent fuel storage rack, in this paper, a two-dimensional model of the CAP1400 rack is established and added mass of rack were obtained by the numerical simulation. The numerical results are in good agreement with the experimental ones. Therefore, the effective of numerical method for the calculation of the added mass is validated. In order to study added mass of the multi-rack, the hydraulic mass matrix of double-rack is calculated by CFD. The results can provide added mass input for the design and analysis of the CAP1400 series rack.