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Manufacturing Methodology, Repair History, and Loadings for Westinghouse and Combustion Engineering Pressurizers, to Support Detailed Structural Integrity Evaluations of the Nozzle Safe End Configurations

[+] Author Affiliations
Cameron Martin, Warren Bamford, Nathan Palm

Westinghouse Electric Company, Madison, PA

Paper No. PVP2008-61843, pp. 1169-1186; 18 pages
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication, Parts A and B
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4829-6
  • Copyright © 2008 by ASME


As a result of the finding of several large in-service inspection (ISI) indications at the Wolf Creek Nuclear Plant in the Fall of 2006, a major calculational effort was undertaken to accurately define the structural integrity margins which exist for the dissimilar metal welds, specifically the safety, relief, spray, and surge nozzle-to-safe-end regions. The Alloy 82/182 weld region of each of these nozzles is susceptible to primary water stress corrosion cracking (PWSCC), and predicting the extent of cracking accurately requires a detailed treatment of the residual stress present due to both the welding process used for the manufacture, and the extent of repairs present. This paper will discuss the manufacturing process used and compare and contrast them. A review will be provided of the types of repairs typically made to these components, as well as the types of loadings which typically occur during service. Also discussed will be the process used to ensure the accuracy of these findings in application to the operating plants of interest.

Copyright © 2008 by ASME



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