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Technical Basis for Proposed Revisions to ASME Code Case N-513 and Some Applications to Moderate Energy Piping

[+] Author Affiliations
Robert O. McGill, Nathaniel G. Cofie

Structural Integrity Associates, San Jose, CA

Russell C. Cipolla

Aptech Engineering Services, Sunnyvale, CA

Guy DeBoo

Exelon Corporation, Warrenville, IL

Paper No. PVP2006-ICPVT-11-93428, pp. 53-60; 8 pages
doi:10.1115/PVP2006-ICPVT-11-93428
From:
  • ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference
  • Volume 1: Codes and Standards
  • Vancouver, BC, Canada, July 23–27, 2006
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4752-7 | eISBN: 0-7918-3782-3
  • Copyright © 2006 by ASME

abstract

Code Case N-513 provides evaluation rules and criteria for temporary acceptance of flaws, including through-wall flaws, in moderate energy piping. The application of the Code Case is restricted to Class 2 and 3 systems, so that safety issues regarding short-term system operation are minimized. The first version of the Code Case was published in 2000. Since then, there have been two revisions to the Code Case (N-513-1 [1] and N-513-2 [2]) that have been published by ASME. There is currently work underway to incorporate additional changes to the Code Case to make it easier to apply to through-wall, nonplanar flaws. The technical basis for the original version of the Code Case and the first revision, N-513-1, has been previously published [3]. This paper provides the technical basis for the changes in the second revision of the Code Case, N-513-2, and the proposed changes to a third revision. These changes specifically address exceptions taken by the NRC in the first version of the Code Case and more importantly provide flaw evaluation rules for through-wall, nonplanar flaws. The flaw evaluation rules for through-wall, nonplanar flaws are based on ASME Code Section III branch reinforcement rules and also a quasi planar flaw approach. These developments are described in the paper. In addition, practical examples involving the application of the Code Case to through-wall, nonplanar flaws are also provided.

Copyright © 2006 by ASME
Topics: Pipes , ASME Standards

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