Seismic isolation of a condensate storage tank using the friction pendulum system

In this study, the isolation of a Condensate Storage Tank (CST) is considered. The CST is one of the important structures in a nuclear power plant because the CST stores the cooling water. The purpose of this study is not only for the decrease of the seismic force of the CST, but in the sequel decrease of the CDF. For the investigation of the isolated CST, a numerical analysis is performed. In order to construct the governing equation of the whole system, finite elements for a structure and boundary elements for a fluid region are coupled using the equilibrium and compatibility conditions. The isolator is simulated by an equation proposed in 3D Basis Me. The target structure of this study is the CST of Ulchin 5,6 unit. The dimension of CST is tabulated in Table 1