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

[+] Author Affiliations
Hiroyuki Asano

Obayashi Corporation, Tokyo, Japan

Tsutomu Hirotani

Shimizu Corporation, Tokyo, Japan

Takashi Nakayama

Kajima Corporation, Tokyo, Japan

Takemi Norimono

Takenaka Corporation, Tokyo, Japan

Yuji Aikawa

Taisei Corporation, Tokyo, Japan

Kunihiko Sato

Mitsubishi Heavy Industries, Ltd., Kobe, Hyogo, Japan

Shinji Asakura

Hitachi-GE Nuclear Energy, Hitachi, Ibaraki, Japan

Masakazu Jimbo

Toshiba Corporation, Yokohama, Kangawa, Japan

Yoshito Umeki

Chubu Electric Power Co., Inc., Nagoya, Aichi, Japan

Paper No. PVP2014-29040, pp. V008T08A017; 9 pages
doi:10.1115/PVP2014-29040
From:
  • ASME 2014 Pressure Vessels and Piping Conference
  • Volume 8: Seismic Engineering
  • Anaheim, California, USA, July 20–24, 2014
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4607-0
  • Copyright © 2014 by ASME

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.

Copyright © 2014 by ASME

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