United States Nuclear Regulatory Commission - Protecting People and the Environment

Large-Scale Vibration Tests of Main Steam and Feedwater Piping Systems With Conventional and Energy-Absorbing Supports (NUREG/CR-6559, BNL-NUREG-52532)

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Publication Information

Manuscript Completed: April 1998
Date Published: August 1998

Prepared by:
Y. J. Park, G. DeGrassi, P. Bezler,
and C. H. Hofmayer

Brookhaven National Laboratory
Upton, NY 11973-5000

Upton, NY 11973-5000

NRC Job Code W6081

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

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Abstract

As part of collaborative efforts between the United States and Japan, the U.S. Nuclear Regulatory Commission (USNRC) and Brookhaven National Laboratory (BNL) participated in the Seismic Proving Test program of main steam and feedwater systems (MS) conducted by the Nuclear Power Engineering Corporation (NUPEC) for the Ministry of International Trade and Industry (MITI) of Japan. Scaled models of main steam piping for a typical PWR plant and feedwater piping for a BWR plant were fabricated by NUPEC and subjected to a large number of earthquake motions at NUPEC's Tadotsu Engineering Laboratory. Initially, the piping systems were supported by conventional snubbers and subjected to design level earthquakes as well as excitations beyond the design level. Then the snubbers were replaced by energy absorbing devices, and tests at various excitation levels up to the deformation limits of the energy absorbers were performed. This report describes the evaluation of the test results and BNL's post-test analyses.

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