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Science and Technology of Nuclear Installations
Volume 2010 (2010), Article ID 517471, 8 pages
Research Article

Fluid-Structure Interaction in a 3-by-3 Reduced-Scale Fuel Assembly Network

1CEA CADARACHE DEN/DTN/STRI/LHC, 13108 Saint-Paul-Lez-Durance Cedex, France
2LMA CNRS, 31 chemin Joseph Aiguier, 13402 Marseille Cedex 20, France

Received 3 August 2010; Accepted 1 October 2010

Academic Editor: Eugenijus Ušpuras

Copyright © 2010 Guillaume Ricciardi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We present experimental results on 9 reduced-scale fuel assemblies arranged in a network of 3 by 3, subjected to an axial flow. The objective is to analyse the fluid force induced by the motion of the central fuel assembly on the others fuel assemblies. The displacement of the central fuel assembly is imposed, while the others are fixed. Fluid forces acting on fuel assemblies are measured with force sensors. We observed that the coupling between fuel assemblies increases with the fluid velocity, and that the coupling in the transverse direction is not negligible compared to the coupling in the direction of excitation. We also observe that the fluid flow induces a stiffening of the central fuel assembly.