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Spectral Response to Harmonic Excitation of Rods in a Confined Nuclear Fuel Mini-Bundle

[+] Author Affiliations
Radu O. Pomîrleanu

Westinghouse Electric Company

Paper No. PVP2005-71486, pp. 583-592; 10 pages
doi:10.1115/PVP2005-71486
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

In this paper, the effect of the confinement on the vibration of rods within nuclear fuel bundle is analyzed and discussed. Differential added damping of the rods depending on their position within the bundle adds to the classical development of modal and spectral analysis. This is accomplished by coupling the classical modeling of the variable-mass, Euler-Bernoulli beam on elastic supports with the two-dimensional computational fluid dynamics (CFD) estimation of motion-dependent effects, with the viscous effects integrally modeled. A 5×5 reduced-scale (shortened) rod bundle subject to room-temperature single-phase nominally axial flow within a square confinement is used to illustrate the response to a harmonically varying excitation. The harmonic analysis showed that there are significant differences in the response of the rods, depending on their position within the bundle.

Copyright © 2005 by ASME

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