There are many large standing liquid tanks for collecting radioactive waste liquid in nuclear engineering, the tanks must keep structural integrity and the structural break shouldn’t happen in order to avoid the radioactive leaking accident, so the accuracy of the seism analysis is most important. The liquid sloshing is very sharp in the large standing liquid tank because the weight of waste liquid in the tank always exceeds ten tons.
In order to think over the sloshing effect accurately in seism analysis the 3D mass-spring finite element model is applied instead of the conventional method such as the fixing mass method because the latter is too conservative for Large Radioactive Liquid Tank.
In this paper the software ANSYS is used to simulate the seism response, the waste liquid in the large tank is divided into two portion, one is the static portion and the other is the sloshing portion comparing to the tank on the condition of the seism, the spectrum method is adopted to research the response of the structure model under the seism.
The results show that the mass-spring model referenced to 3-D model is effective for the seism analysis of the large standing liquid tanks. The results of the mass-spring model are more accurate than that of the conventional method.
