The research on isolation performance of containment vessel of EPR nuclear power plant under long-period ground motions
The containment vessel is the necessary facility to effectively ensure the safety of nuclear power plant,and it is of important values both in theory and engineering to examine the isolation performance of containment vessel under long-period ground motions.In this pa-per,a containment vessel of a nuclear power plant with the evolutionary power reactor(EPR)is taken as the research model,and a 3D com-puter simulated model is established with application of the software ANSYS considering the containment vessel self-weight and pres-tressed tendon system.It is proved that the containment vessel has good mechanical properties and is under control by way of the average stress of prestressed tendons,deformation,acceleration,and base shear of containment vessel under long-period ground motions.For this reason,a new base isolation device made up of the laminated rubber bearing and the mild steel damper in parallel and it is employed to fur-ther investigate the base isolation performance of containment vessel under long-period ground motions.These research findings indicate that the long-period ground motions must be paid attention to in many aspects in the design of nuclear power plant containment vessel due to the ground motion characteristics(for instance,randomness,uncertainty and spatial correlation).The new base isolation device is effec-tive for short-period ground motions,but invalid for long-period ground motions.Hence,it offers the technical guidance for the base isola-tion design of nuclear power plant containment vessel.
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