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Flow-Induced Vibration Characteristics of Steam Generator U-Tubes With Defect

[+] Author Affiliations
Jong-Chull Jo, Myung Jo Jhung, Woong-Sik Kim, Hho-Jung Kim

Korea Institute of Nuclear Safety, Daejeon, Korea

Paper No. PVP2003-1813, pp. 13-19; 7 pages
doi:10.1115/PVP2003-1813
From:
  • ASME 2003 Pressure Vessels and Piping Conference
  • Problems Involving Thermal Hydraulics, Liquid Sloshing, and Extreme Loads on Structures
  • Cleveland, Ohio, USA, July 20–24, 2003
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-1695-8
  • Copyright © 2003 by ASME

abstract

This paper investigates the fluidelastic instability characteristics of steam generator (SG) U-tubes with defect. The operating SG shell-side flow field conditions for determining the fluidelastic instability parameters such as damping ratio and added mass are obtained from three-dimensional SG flow calculation. Modal analyses are performed for the U-tubes either with axial or circumferential flaw with different sizes. Special emphases are on the effects of flaw orientation and size on the modal and instability characteristics of tubes, which are expressed in terms of the natural frequency, corresponding mode shape and stability ratio.

Copyright © 2003 by ASME

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