Dynamic Characteristic Analysis of the Passive Containment Cooling System Water Tank of Nuclear Power Plant
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Abstract
PCS tank is an important part of passive containment cooling system of AP series nuclear power plants. The dynamic characteristics of the whole tank will be changed by the fluid-structure coupling effect, even worse it may be destroyed by the effect. Hence, it is necessary to take the fluid-structure interaction into consideration when addressing the dynamic analysis of the PCS tank. A theoretical method about the water sloshing analysis has been showed in the paper, and the first natural frequency of the tank with 60%、70%、80% water have been got. Then the modal analysis is preceded for the empty tank model and three different water storage models by using the finite element software ANSYS. At the same time, the influence analysis of water storage is processed. The result of the modal analysis have been compared with the result of theoretical method. Finally, the seismic response spectrum analysis have been processed. The results showed that the fluid can be excited easily by seismic load due to the lower frequency. So the sloshing effect of the water must be considered in the design of the PCS tank.
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