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Suggested Improvements to Appendix G of ASME Section XI Code

[+] Author Affiliations
Hardayal S. Mehta

GE Hitachi Nuclear, Sunol, CA

Timothy J. Griesbach

Structural Integrity Associates, Inc., San Jose, CA

Gary L. Stevens

Structural Integrity Associates, Inc., Centennial, CO

Paper No. PVP2008-61624, pp. 365-375; 11 pages
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 1: Codes and Standards
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4824-1 | eISBN: 0-7918-3828-5
  • Copyright © 2008 by ASME


This paper reviews some of the original basis documents for ASME Section XI Nonmandatory Appendix G for calculating pressure-temperature (P-T) limits and recommends areas for improvement. The original Appendix G in Section XI of ASME Code was mainly based on Welding Research Council (WRC) Bulletin 175 (WRC-175). Changes have been made to Appendix G over the past 20 years such as the use of the KIC reference toughness curve instead of KIR . However, aspects of the Appendix G method still refer back to WRC Bulletin 175. The published technical literature since the development of WRC 175 could be used to enhance the Appendix in a number of areas. One such area is stress intensity factor (K) calculation procedures for thermal gradient loading at a nozzle corner. This paper will review and evaluate the available K calculation methods for a nozzle corner crack, and develop closed-form expressions for incorporation into Appendix G. Also, the following areas will be reviewed: (1) treatment of operating stresses exceeding the material yield stress, and (2) fracture toughness criteria typically used for other than reactor pressure vessel (RPV) and piping for protection against non-ductile failure. This paper will also identify areas for future improvements in Appendix G.

Copyright © 2008 by ASME



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