Numerical Simulation Of Seismic Response Of Floating Nuclear Island Structure

201 1 Fukushima nuclear power plant in Japan by a tsunami and earthquake caused a serious nuclear accident.China is located in the middle of two active seismic zones in the world,and nuclear power is booming in our country.Therefore,summing up the experiences and lessons from this earthquake is of great significance to the development of nuclear power in our country.Floating nuclear island is the use of water flow characteristics to slow the direct impact of seismic waves on the nuclear island.Under the influence of seismic waves,the surge generated by the water body acts on the floating nuclear island,causing the nuclear island to oscillate and vibrate.In this paper,numerical simulation is carried out to study the surge condition of the water body loaded in the concrete tank during and after the earthquake and the movement and stability of the floating nuclear island.The correlation between the main geometrical dimensions of D1,D,H,H1 and the damping effect is studied respectively for the four different design schemes,and the relationship between the different parameters and the damping effect is respectively pointed out.The effect of inundation depth and the location of gravity center of nuclear island on stability is analyzed.The velocity distribution,the variation of surge and the hydrodynamic pressure on the surface of nuclear island were studied.When the peak acceleration of the earthquake is 0.3,0.5 and 0.8g respectively,the stability of the floating nuclear island is compared.Two superimposed seismic wave combinations were performed.Comparisons were made between the movement of a single vertical wave and a single horizontal floating nuclear island.Finally,we come to the ideal conclusion.