Flow-Induced Vibration Analysis of an Integral Economizer Once-Through Steam Generator

[+] Author and Article Information
M. K. Au-Yang, B. Brenneman

Babcock & Wilcox, Nuclear Power Division, Lynchburg, VA 24506

J. Pressure Vessel Technol 111(4), 501-506 (Nov 01, 1989) (6 pages) doi:10.1115/1.3265708 History: Received August 07, 1988; Revised February 22, 1989; Online November 05, 2009


The integral economizer once-through steam generator is a second-generation steam generator used in B&W’s 205-fuel assembly nuclear power plants. Besides having an integral economizer, this steam generator differs from the first generation units, sixteen of which have been operating with B&W’s 177 fuel assembly nuclear power plants for more than ten years, in having a much higher flow rate. This higher flow rate induces a correspondingly higher fluid-dynamic load on all of the steam generator internal components, particularly the tube bundle. This paper describes the flow-induced vibration design analysis of this second-generation nuclear steam generator. The three most commonly known flow-induced vibration phenomena were considered: fluid-elastic instability, turbulence-induced vibration and vortex-induced vibration. To minimize uncertainties in the many experimentally determined input parameters such as damping ratios, Connors’ constant and the dynamic pressure power spectral densities, a parallel analysis was carried out on the operating first-generation steam generator, and the results compared. The analytical results were verified by the recent start-up of B&W’s first 205-fuel assembly nuclear plant. No vibration problems were encountered during either the pre-operational test or in several months of full power operations.

Copyright © 1989 by ASME
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