Pseudo-Dynamic Test and Non-Linear Analysis of a 1:10 Scale Pre-Stressed Concrete Contain Vessel Model for CNP1000 Nuclear Power Plant

Abstract eng:
As the final barrier to prevent leakage, the pre-stressed concrete containment vessel (PCCV) is an important component of nuclear power plant. In order to verify the seismic safety of a new type PCCV structure for the latest developed nuclear power plant CNP1000 in China, SDOF system pseudo-dynamic test and non-linear analysis of a 1:10 scale PCCV structural model were carried out. To perform the pseudo-dynamic test an artificial earthquake wave was used as the ground motion. According to the scale factor of the test model, the peak acceleration was adjusted to 1g, 2g and 3g respectively, which corresponding to 0.1g, 0.2g and 0.3g for the practical PCCV structure and the corresponding damping ratios of the structure were assumed to be 0.02, 0.05 and 0.05, respectively. The test results show that under earthquake excitation with peak acceleration 2g (the design earthquake level, corresponding to the safety shutdown earthquake level of the US criteria), tensile strains of few concrete monitoring points near the fixed bottom of the model reached the cracking strain, and the equivalent lateral stiffness of the model decreased 5% of its elastic value. When the peak acceleration was 3g, the equivalent lateral stiffness of the model decreased 14% of its elastic value. The static non-linear analysis gives the ultimate lateral load. The dynamic non-linear analysis reveals the strain distribution and the crack pattern on the cylinder of the test model. The analytical results have a good agreement with the test results. It is concluded that under the excitation of the shut down earthquake the PCCV for CNP1000 as a whole is elastic and has sufficient seismic resisting safety.

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