Creep Relaxation of Fuel Pin Bending and Ovalling Stresses

[+] Author and Article Information
D. P. Chan, R. J. Jackson

Westinghouse Hanford Company, Richland, Wash.

J. Eng. Power 103(4), 621-626 (Oct 01, 1981) (6 pages) doi:10.1115/1.3230784 History: Received April 04, 1980; Online September 28, 2009


Analytical methods for calculating fuel pin cladding bending and ovalling stresses due to pin bundle-duct mechanical interaction taking into account nonlinear creep are presented. Calculated results are in close agreement with finite element results by MARC-CDC program. The methods are used to investigate the effect of creep on the FTR fuel cladding bending and ovalling stresses. It is concluded that the cladding of 316 SS 20 percent CW and reference design has high creep rates in the FTR core region to keep the bending and ovalling stresses to acceptable levels.

Copyright © 1981 by ASME
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