Seismic Damping Factors of Small Bore Piping as Influenced by Insulation and Support Elements

[+] Author and Article Information
L. K. Severud, M. J. Anderson, D. A. Barta

Engineering Analysis, Westinghouse Hanford Company, Richland, Wash. 99352

J. Pressure Vessel Technol 107(2), 142-147 (May 01, 1985) (6 pages) doi:10.1115/1.3264426 History: Received April 27, 1983; Revised November 28, 1984; Online November 05, 2009


Seismic damping tests of a prototypical Liquid Metal Fast Breeder Reactor (LMFBR) small bore piping system is described, and measured transient responses to pulse excitations are reported. The test specimen was representative of a typical LMFBR insulated small bore piping system, and it was supported from a rigid test frame by prototypic dead weight supports, mechanical snubbers, and pipe clamps. Various support configurations were tested to assess the response sensitivity to insulation and other nonlinear support characteristics. Damping factors increased significantly due to the insulation and use of mechanical snubbers. Factors much higher than the magnitudes currently allowed in design by the USNRC Regulatory Guide 1.61, were found. This verified the design values, and it also pointed out the possibility of undue conservatism and costly overdesign resulting from use of the present design values.

Copyright © 1985 by ASME
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