Steam generators are the subject of major concern in nuclear power plant safety. Within these generators, the tightness barrier, which separates the primary and secondary circuits, is ensured by the existence of a residual contact pressure at the tube-to-tubesheet joint interface. Any leakage is unacceptable, and its consequences are very heavy in terms of the human and environmental safety as well as maintenance cost. Some studies have been conducted to understand the main reasons for such failure. However, no analytical model able to predict the attenuation of the residual contact pressure under the effect of material creep relaxation behavior. The development of a simple analytical model able to predict the change in the residual contact pressure as a function of time is laid out in this paper. The results from the analytical model are checked and compared with those of finite elements. A simulation conducted on a high temperature tube-to-tubesheet joint has shown that relaxation of the contact stress due to creep can be significant and should be considered in the design.
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December 2010
Research Papers
Effect of Creep on the Residual Stresses in Tube-to-Tubesheet Joints
Nor Eddine Laghzale,
Nor Eddine Laghzale
Department of Mechanical Engineering,
e-mail: lagnore@yahoo.com
Ecole de Technologie Superieure
, 1100, rue Notre-Dame Ouest, Montreal, QC, H3C 1K3, Canada
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Abdel-Hakim Bouzid
Abdel-Hakim Bouzid
Professor
Department of Mechanical Engineering,
e-mail: hakim.bouzid@etsmtl.ca
Ecole de Technologie Superieure
, 1100, rue Notre-Dame Ouest, Montreal, QC, H3C 1K3, Canada
Search for other works by this author on:
Nor Eddine Laghzale
Department of Mechanical Engineering,
Ecole de Technologie Superieure
, 1100, rue Notre-Dame Ouest, Montreal, QC, H3C 1K3, Canadae-mail: lagnore@yahoo.com
Abdel-Hakim Bouzid
Professor
Department of Mechanical Engineering,
Ecole de Technologie Superieure
, 1100, rue Notre-Dame Ouest, Montreal, QC, H3C 1K3, Canadae-mail: hakim.bouzid@etsmtl.ca
J. Pressure Vessel Technol. Dec 2010, 132(6): 061210 (6 pages)
Published Online: October 29, 2010
Article history
Received:
September 7, 2009
Revised:
November 27, 2009
Online:
October 29, 2010
Published:
October 29, 2010
Citation
Laghzale, N. E., and Bouzid, A. (October 29, 2010). "Effect of Creep on the Residual Stresses in Tube-to-Tubesheet Joints." ASME. J. Pressure Vessel Technol. December 2010; 132(6): 061210. https://doi.org/10.1115/1.4001218
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