In this study, response spectrum analysis reflecting fluid-structure interaction (FSI) was performed to conduct seismic analysis of the steel containment vessel of a small modular reactor (SMR) submerged in a water tank. A three-dimensional finite element model combining structural and acoustic elements was constructed, and the natural frequencies and mode shapes including FSI were derived through eigenvalue analysis for the asymmetric mass and stiffness matrix. The response spectrum analysis was performed by applying the design response spectrum with 5% damping, and the results were compared with the in-air model. Under underwater conditions, the natural frequencies are lowered due to the fluid-added mass effect, and the structural response seems to be amplified in the range of 5–20 Hz. The proposed procedure can be effectively utilized in the seismic design and regulatory review of underwater SMR containment vessels.
김지웅 [ Jiwoong Kim | MS candidate, Dept. of Aerospace Engineering, Sunchon National University ]
이희남 [ Huinam Rhee | Member, Professor Emeritus, Dept. of Mechanical & Aerospace Engineering/Aerospace Research Center, Sunchon National University ]
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