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Science and Technology of Nuclear Installations
Volume 2013 (2013), Article ID 673535, 9 pages
http://dx.doi.org/10.1155/2013/673535
Research Article

Assembly and Irradiation Modeling of Residual Stresses in Low-Enriched Uranium Foil-Based Annular Targets for Molybdenum-99 Production

Department of Mechanical and Aerospace Engineering, University of Missouri, E2413 Lafferre Hall, Columbia, MO 65211, USA

Received 31 May 2013; Accepted 29 August 2013

Academic Editor: George Vandegrift

Copyright © 2013 Srisharan G. Govindarajan 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.

Abstract

This paper considers a composite cylindrical structure, with low-enriched uranium (LEU) foil enclosed between two aluminum 6061-T6 cylinders. A recess is cut all around the outer circumference of the inner tube to accommodate the LEU foil of open-cross section. To obtain perfect contact at the interfaces of the foil and the tubes, an internal pressure is applied to the inner tube, thereby plastically and elastically deforming it. The residual stresses resulting from the assembly process are used along with a thermal stress model to predict the stress margins in the cladding during irradiation. The whole process was simulated as a steady-state two-dimensional problem using the commercial finite element code Abaqus FEA. The irradiation behavior of the annular target has been presented, and the effect of the assembly residual stresses has been discussed.