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Statistical Analysis of Seismic Effects of Low Seismic Class Equipment Based on Damage Data of Nuclear Power Plants

[+] Author Affiliations
Ryo Morita, Fumio Inada

Central Research Institute of Electric Power Industry, Tokyo, Japan

Yasuki Ohtori

Central Research Institute of Electric Power Industry, Chiba, Japan

Mitsuhide Nanpo

Hokkaido Electric Power Company, Sapporo, Hokkaido, Japan

Koji Naradate

Tohoku Electric Power Company, Sendai, Miyagi, Japan

Syuhei Yamaguchi

Tokyo Electric Power Company, Tokyo, Japan

Masataka Takeuchi

Chubu Electric Power Company, Nagoya, Aichi, Japan

Tatsuya Yamaguchi

Hokuriku Electric Power Company, Toyama, Japan

Takeshi Numata

Kansai Electric Power Company, Mihama, Fukui, Japan

Ichiro Tamura

The Chugoku Electric Power Company, Hiroshima, Japan

Terushige Hosotani

Shikoku Electric Power Company, Takamatsu, Kagawa, Japan

Yusuke Kimura

Kyushu Electric Power Company, Fukuoka, Japan

Mitsuhiko Amemiya

The Japan Atomic Power Company, Tokyo, Japan

Toyonobu Taguchi

J-POWER/Electric Power Development Company, Tokyo, Japan

Naomi Fukushi

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

Atsushi Yamaguchi

Toshiba Corporation, Yokohama, Kanagawa, Japan

Nobuyuki Kojima

Mitsubishi Heavy Industries, Takasago, Hyogo, Japan

Paper No. PVP2014-28644, pp. V008T08A050; 10 pages
doi:10.1115/PVP2014-28644
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

Structural strengths of the piping and components in NPPs have been designed with seismic margin. They are classified seismically S, B and C class in terms of the influence rate to nuclear safety. For the highest seismic class (Class S) equipment, it is clarified that they have enough seismic margins against design seismic conditions by shaking table tests or numerical simulations. However, for the lower seismic class (Class B and C) equipment, their seismic margins have not been clarified quantitatively.

In this paper, in order to evaluate seismic robustness of the lower seismic class equipment with no clarification of seismic margin, seismic influences of the lower seismic class equipment in NPPs damaged by actual large earthquakes have been surveyed and sorted as a database, and the integrity of the lower class equipment have been discussed.

Seismic effects on 24 plants damaged by the recent large 6-earthquakes are surveyed, sorted as a database, and investigated. As a result, a total of 29 cases of function deterioration or loss were observed. Considering the total number of components and piping, the frequency of those cases in class B and C components and piping was low. And also, as it is found there are a few cases of degradation or loss of function in the equipment installed on the bedrock or in the buildings.

Copyright © 2014 by ASME

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