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http://dx.doi.org/10.3795/KSME-A.2010.34.1.97

Analysis of Overlay Weld Effect on Preventing PWSCC in Dissimilar Metal Weld  

Lee, Seung-Gun (Power Engineering Research Institute, KOPEC(Korea Power Engineering Company inc.))
Oh, Chang-Kyun (Power Engineering Research Institute, KOPEC(Korea Power Engineering Company inc.))
Park, Heung-Bae (Power Engineering Research Institute, KOPEC(Korea Power Engineering Company inc.))
Jin, Tae-Eun (Power Engineering Research Institute, KOPEC(Korea Power Engineering Company inc.))
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.34, no.1, 2010 , pp. 97-101 More about this Journal
Abstract
PWSCC(Primary Stress Corrosion Cracking) in Alloy 82/182 butt welds is the problem affecting safety and integrity of nuclear power plant. PWSCC can be occurred in the area that is at high magnitude of tensile residual stress, such as Alloy 82/182 dissimilar metal welds in PZR(pressurizer) nozzles. There have been a number of incidents recently at the dissimilar metal welds in overseas nuclear power plants. Overlay weld is the one of the effective methods to decrease tensile residual stress of inside surface, which will result in preventing PWSCC. In this paper, overlay weld conditions on the purpose of preventing PWSCC was explained and the benefit of the overlay weld was confirmed performing finite element analysis.
Keywords
Dissimilar Metal Weld; Residual Stress; PWSCC; Overlay Weld; Finite Element Analysis;
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  • Reference
1 EPRI, 2005, "Technical Basis for Preemptive Weld Overlays for Alloy 82/182 Butt Welds in PWRs(MRP-169)."
2 ASME Code Case N-504-3, "Alternative Rules for Repair of Classes 1, 2, and 3 Austenitic Stainless Steel Piping, Section XI, Division 1."
3 ASME Code Case N-740-1, "Dissimilar Metal Weld Overlay for Repair or Mitigation of Class 1, 2, and 3 items, Section XI, Division 1."
4 ASME Code, Section XI, "Rules for Inservice Inspection of Nuclear Power Plant Components," 2007 Edition
5 ASME Code, Section II, "Materials," Part D-Properties, 2001 Edition
6 SIMULIA, 2008, ABAQUS, Version 6.8