Assessment of EQS Seismic Isolation Device for Nuclear Power Plant

This study describes research on a performance test of an EQS seismic protection isolator for application to structures in nuclear power plants (NPP) as part of the R and D project, 'Development for the localization of seismic protection isolator for the structures in NPP'. The Eradi Quake System (EQS) is a seismic protection isolator which has been applied up to now for seismic protection isolation in bridge structures both locally and overseas, but higher performance is required for application to the structures in NPP. To reflect this need, a continual R and D study has been performed through this project in order that improved performance can be achieved with the EQS seismic protection isolator. Performance test results with regard to the EQS isolator are shown in this paper. It can be verified from the test results of the EQS seismic protection isolator that there is a dependency in seismic pressure, velocity and displacement. It can be also verified that safety is enhanced because the EQS damping capability is raised in the event of a heavy seismic load, and low resistance capability is possible towards the recovery of the structure following an earthquake