Full structural weld overlays have been used in the U.S. nuclear power industry for over twenty years in boiling water reactors (BWRs). Primary water stress corrosion cracking (PWSCC) in nickel-based dissimilar metal welds (DMWs) has been experienced in pressurized water reactors (PWRs) since the early 1990s. As a result, the nuclear industry is implementing full structural weld overlays (FSWOL) as a PWSCC mitigation technique that may be used on primary coolant lines previously approved for Leak-Before-Break (LBB). This work investigates the effect of the FSWOL on the leakage behavior of these lines with postulated defects. In this paper, finite element (FE) based crack-opening displacements (CODs) were developed for pipes with a FSWOL with postulated complex cracks. The COD solutions were then employed in standard leak-rate calculations, where equivalent crack morphology parameters were developed to consider a flow through two different crack morphologies, i.e., PWSCC through the DMW and corrosion fatigue through the weld overlay. The results of the sensitivity study and a discussion on the impact of the weld overlay on the leakage behavior concludes this paper.
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ASME 2009 Pressure Vessels and Piping Conference
July 26–30, 2009
Prague, Czech Republic
Conference Sponsors:
- Pressure Vessels and Piping
ISBN:
978-0-7918-4369-7
PROCEEDINGS PAPER
Crack-Opening Displacement and Leak-Rate Calculations for Full Structural Weld Overlays
D.-J. Shim,
D.-J. Shim
Engineering Mechanics Corporation of Columbus, Columbus, OH
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E. Kurth,
E. Kurth
Engineering Mechanics Corporation of Columbus, Columbus, OH
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F. Brust,
F. Brust
Engineering Mechanics Corporation of Columbus, Columbus, OH
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G. Wilkowski,
G. Wilkowski
Engineering Mechanics Corporation of Columbus, Columbus, OH
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A. Csontos,
A. Csontos
U. S. Nuclear Regulatory Commission, Rockville, MD
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D. Rudland
D. Rudland
U. S. Nuclear Regulatory Commission, Rockville, MD
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D.-J. Shim
Engineering Mechanics Corporation of Columbus, Columbus, OH
E. Kurth
Engineering Mechanics Corporation of Columbus, Columbus, OH
F. Brust
Engineering Mechanics Corporation of Columbus, Columbus, OH
G. Wilkowski
Engineering Mechanics Corporation of Columbus, Columbus, OH
A. Csontos
U. S. Nuclear Regulatory Commission, Rockville, MD
D. Rudland
U. S. Nuclear Regulatory Commission, Rockville, MD
Paper No:
PVP2009-77966, pp. 1149-1156; 8 pages
Published Online:
July 9, 2010
Citation
Shim, D, Kurth, E, Brust, F, Wilkowski, G, Csontos, A, & Rudland, D. "Crack-Opening Displacement and Leak-Rate Calculations for Full Structural Weld Overlays." Proceedings of the ASME 2009 Pressure Vessels and Piping Conference. Volume 6: Materials and Fabrication, Parts A and B. Prague, Czech Republic. July 26–30, 2009. pp. 1149-1156. ASME. https://doi.org/10.1115/PVP2009-77966
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