Development of an Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities: Part 10 — Evaluation of Seismic Isolator Design

Abstract

This paper provides a part of series of “Development of an Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities”. This part shows an evaluation of seismic isolator design established in this project where several methods are newly developed. The major four accomplishments are as follows. One: establishment of design earthquake specially considered for seismically isolated nuclear power facilities. The design earthquakes are made to fit multiple target spectra with different damping factors considering a building, equipment and seismic isolators for more precise response analyses. Two: design and development of a high-performance seismic isolator. Against the large design earthquakes, a seismic isolator is newly developed which has a large diameter lead plug for more damping; the isolators were actually manufactured and tested. Three: seismic response analyses for seismically isolated nuclear power plants. Light water reactors are designed where the structural characteristics of the seismic isolation system is reflected. Four: evaluation of thermal effects on seismic isolators by a long-duration earthquake. Considering a long-duration earthquake, the heat generation phenomenon in the lead plug is analytically evaluated to ensure the lead plug’s damping performance. By introducing these accomplishments, the realistic design of a seismically isolated nuclear power plant is achieved.

Design Method for Base-Isolation Structure Combined With Active Control Based on the Limitation Conditions of the Responses and Control Force

“…At present, the PBI structure is widely used globally, not only in public buildings and high-rise apartments, but also in major constructions (G. P. Warn et al, 2012). Applying the PBI structure to nuclear power stations is a topic of worldwide research (S. Ryu et al, 2013, N. Takemi et al, 2013, A. S. Whittaker et al, 2014, H. Asano et al, 2014and M. Kumar et al, 2017. However, by the end of 2017, there were no instances of nuclear power stations using the PBI structure in Japan (T. Hiraki et al, 2017).…”