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Introduction of a Research Activity on the Seismic Safety Evaluation of Nuclear Piping Systems Taking the Effect of Elastic-Plastic Behavior Into Account

[+] Author Affiliations
Izumi Nakamura

National Research Institute for Earth Science and Disaster Prevention, Tsukuba, Japan

Masaki Shiratori, Tadahiro Shibutani

Yokohama National University, Yokohama, Japan

Akihito Otani

IHI Corporation, Yokohama, Japan

Masaki Morishita

Japan Atomic Energy Agency, Oarai, Japan

Hitoshi Nakamura

ITOCHU Techno-Solutions Corporation, Chiyoda, Japan

Paper No. PVP2015-45262, pp. V01BT01A051; 7 pages
  • ASME 2015 Pressure Vessels and Piping Conference
  • Volume 1B: Codes and Standards
  • Boston, Massachusetts, USA, July 19–23, 2015
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5693-2
  • Copyright © 2015 by ASME


According to investigations of several nuclear power plants (NPPs) hit by actual seismic events and a number of experimental researches on the failure behavior of piping systems under seismic loads, it is recognized that piping systems used in NPPs include a large seismic safety margin until boundary failure and the current code design allowable stresses are very conservative. Since the stress assessment based on the elastic analysis does not reflect actual response of piping systems including plastic region, rational procedures to estimate the elastic-plastic behavior of piping systems under a large seismic load are expected to be developed for piping seismic design applications.

With the aim of establishing a procedure that takes into account the elastic-plastic behavior effect in the seismic safety estimation of nuclear piping systems, a research activity has been planned. Through the activity, the authors intend to establish two kinds of guidelines; 1) a guideline of a standard analysis procedure to evaluate elastic-plastic behavior of piping systems under extreme seismic loads with rational and conservative margins, and 2) a guideline that provide criteria for the seismic safety assessment of piping systems by the standard analysis to evaluate elastic-plastic behavior established by the above guideline. As the first step of making out the analysis guideline, benchmark analyses are conducted for a pipe element test and a piping system test.

In this paper, the outline of the research activity and the preliminary results of benchmark analyses for a pipe element test are described.

Copyright © 2015 by ASME



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