Abstract
In an earthquake, the main equipment support barrels in the pool-type liquid metal fast reactor (LMFR) may experience strong vibrations due to the fluid-structure interaction (FSI) phenomenon. Accurate parameters for FSI characteristics of multiple cylinders are crucial for the seismic design and analysis of these support barrels. Limited experimental data is available for pressure characteristics and FSI parameters, particularly for closely distributed thin-wall internal support barrels. In this research paper, we conducted a mechanism experiment for FSI parameters on support barrels in the fast reactor by performing shaking table tests. We analyzed the variation of the added mass coefficient with different height-diameter ratios and distances (gaps) and studied the pressure distribution and added mass characteristics for the seismic test. According to the study, the cylinder's added mass coefficient is higher under seismic conditions compared to the experimental results obtained from frequency sweeps. This suggests that in addition to the modal additional mass obtained by the modes, the impact of inertial effects may also need to be considered under seismic conditions. We then added the obtained added mass to the finite element model to conduct transient seismic simulations. The results show that the maximum error between experiments and simulations is 15%, which is considered reasonable for approximate engineering applications.
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