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Development of an Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities: Part 4 — Failure Behavior of Crossover Piping for Seismic Isolation System

[+] Author Affiliations
Teruyoshi Otoyo, Akihito Otani

IHI Corporation, Yokohama, Kanagawa, Japan

Shunsuke Fukushima, Masakazu Jimbo

Toshiba Corporation, Yokohama, Kanagawa, Japan

Tomofumi Yamamoto

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

Takaaki Sakakida

Hitachi-GE Nuclear Energy, Ltd., Hitachi, Ibaraki, Japan

Shigenobu Onishi

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

Paper No. PVP2014-29011, pp. V008T08A037; 10 pages
doi:10.1115/PVP2014-29011
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 the series titled “Development of an Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities”. This part shows the failure behavior of crossover piping installed in a seismic isolated plant. The considered crossover piping is supported on one side by an isolated building and by a non-isolated building on the other side. During an earthquake, the piping structure is deformed due to the large relative displacements between the two buildings and at the same time excited by the different building seismic responses. Therefore, the high-pressure crossover piping structure requires both flexibility and strength.

In this study, 1/10 scaled shaking tests and FEM analyses have been performed to investigate the failure behavior of the crossover piping, where both seismic motions and excitations have been taken into account. It was confirmed that the failure occurs at the piping elbow through low cycle fatigue. Moreover, the results of the elastic-plastic response analysis, which simulates an extreme level of excitation corresponding to more than three times the design level, are in good agreement with the test results. The simulation also succeeded in predicting the experimental failure location.

Copyright © 2014 by ASME

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