United States Nuclear Regulatory Commission - Protecting People and the Environment

Seismic Analysis of Simplified Piping Systems for the NUPEC Ultimate Strength Piping Test Program (NUREG/CR-6889)

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Publication Information

Manuscript Completed: September 2005
Date Published: December 2005

Prepared by:
G. DeGrassi and C. Hofmayer
Brookhaven National Laboratory
Upton, NY 11973-5000

S. Ali, NRC Project Manager

Prepared for:
Division of Engineering Technology
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

NRC Job Code N6076

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Abstract

The Nuclear Power Engineering Corporation (NUPEC) of Japan has conducted a multi-year test program for the Ministry of Economy, Trade and Industry (METI) of Japan to investigate the behavior of typical Nuclear Power Plant (NPP) piping systems under large seismic loads. The objectives of this program are to develop a better understanding of the elasto-plastic response and ultimate strength of nuclear piping systems, to ascertain the seismic safety margins in current piping design codes, and to assess new code allowable stress rules. The test program consisted of a series of static and dynamic material tests, piping component tests, simplified piping system tests, and large scale piping tests. As part of collaborative efforts between the United States and Japan on seismic issues, the U.S. Nuclear Regulatory Commission(NRC) and the Brookhaven National Laboratory (BNL) participated in this program by performing both pre-test and post-test analysis for selected tests, and by evaluation of program results. This report presents a summary of the NUPEC tests, describes the BNL post-test analyses of selected simplified piping system tests, and discusses the insights gained from this program.

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