Abstract
Spent fuel storage racks (rack) are used to store highly radioactive spent fuel. Its seismic design is of great significance for radioactive containment. To reduce the transmission of seismic load, the fuel storage racks (racks) are in a free-standing design, whose bottoms are not fixed with the ground of the spent fuel pool wall. In an earthquake, the rack should not deform significantly to avoid the criticality of the fuel assembly during storage, and the water effect shall be considered. The porous rack design is widely used in the third generation PWR. Under seismic conditions, there is fluid penetration in the porous rack and flow around the outside. If the traditional fluid-structure coupling model of the closed structure is adopted, the analysis is too conservative, and the calculation method of transient CFD fluid-structure interaction parameters based on fine modeling is too time-consuming. To improve the calculation efficiency of fluid-structure interaction parameters of porous racks, a BDB-NS coupling model is established for the fluid immersed porous square cylinders. Combined with the Fourier Spectral Method and solved by MATLAB, the fluid force of the porous racks are obtained, and the parameters such as added mass and added damping are obtained. The algorithm is validated by a solid square cylinder in an infinite water zone the CFD results. This paper can provide a basis for the selection of fluid-structure interaction parameters of spent fuel storage racks for CAP1400 and HPR1000.
