Study on the fluid added mass of CAP1400 spent fuel storage rack under vibration condition

The fluid has great influence on the motion and deformation of the structure under vibration condition, which makes the structure produce a strongly nonlinear vibration. The spent fuel storage rack, which submerged in liquid, is an important equipment in nuclear power plant. Thus, it is extremely important to study fluid-structure interaction problem of the spent fuel storage rack among the equipment in nuclear power plant. Moreover, the fluid-structure interaction between the water around the spent fuel storage rack and the structure may compromise the integrity of the storage rack. Therefore, it is highly necessary to research the characteristic of the fluid-structure interaction among the racks. In this paper, the free vibration experiments, based on the 3:10 model of the spent fuel storage rack in CAP1400 (a new reactor type designed by China), were conducted to study the fluid-structure interaction effect of adjacent racks. The parameters of fluid-structure interaction among the racks was measured under different clearances through free vibration experiment. Ultimately, the formula for calculating the added mass of the rack under different gap sizes was put forward in this paper. This study can provide fluid-structure interaction parameters for structural dynamic analysis of the spent fuel storage rack, and offer the assistance for the design and manufacture of spent fuel pools and high-density spent fuel storage racks, ultimately.