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Vibration Damping of Stabilized Steam-Generator Tubes

[+] Author Affiliations
V. P. Janzen, Y. Han, B. A. W. Smith

Atomic Energy of Canada, Ltd., Chalk River, Ontario, Canada

S. M. Fluit

Babcock & Wilcox Canada, Cambridge, Ontario, Canada

Paper No. PVP2005-71666, pp. 647-653; 7 pages
doi:10.1115/PVP2005-71666
From:
  • ASME 2005 Pressure Vessels and Piping Conference
  • Volume 4: Fluid Structure Interaction
  • Denver, Colorado, USA, July 17–21, 2005
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4189-8 | eISBN: 0-7918-3763-7
  • Copyright © 2005 by ASME

abstract

The integrity of steam-generator tubes is an important aspect of the long-term reliable operation of nuclear power plants. In situations where a tube is judged to be at risk, it must be either plugged, or removed, or reliably stabilized in some manner to avoid excessive motion of the tube due to flow-induced vibration. The present work describes measurements of the effect of an internal cable-type stabilizer on the structural damping of steam-generator tubes. The free-vibration response of unstabilized and stabilized tubes was analyzed to provide damping ratios from frequency-domain spectral responses, time-domain logarithmic decrement ratios and time-domain vibration decay-curves. The structural damping ratios typically increased from approximately 1.6% to approximately 4.3% with the addition of the stabilizer. This last value is somewhat less than recently published values for stabilized tubes from a different type of steam generator, suggesting that tube stabilization, while effective, has limitations that need to be conservatively assessed.

Copyright © 2005 by ASME
Topics: Boilers , Damping , Vibration

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