Experimental and Numerical Studies on Sloshing Dynamics of PCS Water Tank of Nuclear Island Building

Abstract

Water tank is one important component of passive containment cooling system (PCS) of nuclear island building. The sloshing frequency of water is much less than structure frequency and large-amplitude sloshing occurs easily when subjected to seismic loadings. Therefore, the sloshing dynamics and fluid-structure interaction (FSI) effect of water tank should be considered when the dynamic response of nuclear island building is analyzed. A 1/16 scaled model was designed and the shaking table test was done, in which the hydrodynamic pressure time histories and attenuation data of wave height were recorded. Then the sloshing frequencies and 1st sloshing damping ratio were recognized. Moreover, modal analysis and time history analysis of numerical model were done by ADINA software. By comparing the sloshing frequencies and hydrodynamic pressures, it is proved that the test method is reasonable and the formulation of potential-based fluid elements (PBFE) can be used to simulate FSI effect of nuclear island building.

Nonlinear Seismic Response Characteristics of CAP1400 Nuclear Island Structure on Soft Rock Sites

“…In order to ensure the correctness of the calculation model, the modal analysis results of CAP1400 nuclear island structure were compared with the results of the relevant existing literature [11,[18][19][20][21][22]. As can be seen from Table 2, the natural vibration frequencies of the first two orders were similar to the results reported in the existing literature.…”