Seismic Analysis of Large-Scale Piping Systems for the JNES-NUPEC Ultimate Strength Piping Test Program (NUREG/CR-6983)
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Manuscript Completed: August 2008
Date Published: November 2008
G. DeGrassi, J. Nie, and C. Hofmayer
Brookhaven National Laboratory
Upton, NY 11973-5000
S. Ali, NRC Project Manager
NRC Job Code N6076
Office of Nuclear Regulatory Research
The Japan Nuclear Energy Safety Organization/Nuclear Power Engineering Corporation (JNES/NUPEC) 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 were 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 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. A summary of the BNL analysis of the simplified piping system tests was documented in an earlier NUREG/CR report. This report describes the BNL post-test analyses of the large-scale piping system tests and discusses the insights gained from this program.