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Science and Technology of Nuclear Installations
Volume 2012, Article ID 540285, 12 pages
http://dx.doi.org/10.1155/2012/540285
Research Article

Effect of Weld Properties on the Crush Strength of the PWR Spacer Grid

1VHTR Technology Development Group, Korea Atomic Energy Research Institute, Daejeon 305353, Republic of Korea
2Nuclear Fuel Cycle Waste Treatment Research Division, Korea Atomic Energy Research Institute, Daejeon 305353, Republic of Korea

Received 29 March 2012; Accepted 19 June 2012

Academic Editor: Yan Yang

Copyright © 2012 Kee-nam Song and Sang-hoon Lee. 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

Mechanical properties in a weld zone are different from those in the base material because of different microstructures. A spacer grid in PWR fuel is a structural component with an interconnected and welded array of slotted grid straps. Previous research on the strength analyses of the spacer grid was performed using base material properties owing to a lack of mechanical properties in the weld zone. In this study, based on the mechanical properties in the weld zone of the spacer grid recently obtained by an instrumented indentation technique, the strength analyses considering the mechanical properties in the weld zone were performed, and the analysis results were compared with the previous research.