Earthquake Response Analysis of Soil-reactor Plant-nuclear power Auxiliary Plant Interaction System

Soil-structure interaction analysis is an important step in seismic design, Considering that the existence of the auxiliary plant may cause the reactor plant in the most unfavorable condition, In the paper the coupled dynamic response of soil- reactor plant-auxiliary plant structure system to earthquake excitation is studied. Based on PASSI, a computation scheme of explicit and implicit element layer is proposed, which can realize explicit and implicit computation alternately, and improve the computation stability with high efficiency. The site analysis and soil-structure interaction analysis examples were compared with the results of ABAQUS commercial software, and the feasibility of the calculation scheme was verified. On this basis, the influence of adjacent plants on the seismic response of a nuclear power plant on the same basis was analyzed. The results show that on the bedrock site, the safety plant has little effect on the reactor plant through the foundation and site, It also has little effect on the seismic response of the reactor plant. Under the seismic wave input, the fuel and electrical plant increased the displacement peak of the reactor plant, reduced the peak of the acceleration response spectrum, and made the peak of the acceleration response spectrum of the top point of the reactor plant move to high frequency. The auxiliary plant sharing the same foundation with the reactor plant should be analyzed holistically, and at least the auxiliary plant connected with the reactor plant should be analyzed holistically.