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Flaw Evaluation Procedures and Acceptance Criteria for Nuclear Piping in ASME Code Section XI

[+] Author Affiliations
Douglas A. Scarth

Kinectrics, Inc., Toronto, Ontario, Canada

Gery M. Wilkowski

Engineering Mechanics Corporation of Columbus, Columbus, OH

Russell C. Cipolla

Aptech Engineering Services, Sunnyvale, CA

Sushil K. Daftuar

Arizona Public Service, Tonopah, AZ

Koichi K. Kashima

CRIEPI, Tokyo, Japan

Paper No. PVP2003-2026, pp. 45-61; 17 pages
doi:10.1115/PVP2003-2026
From:
  • ASME 2003 Pressure Vessels and Piping Conference
  • Flaw Evaluation, Service Experience, and Reliability
  • Cleveland, Ohio, USA, July 20–24, 2003
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4154-5
  • Copyright © 2003 by ASME

abstract

Section XI of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code provides rules and requirements for maintaining pressure boundary integrity of components, piping, and equipment during the life of a nuclear power plant. Evaluation procedures and acceptance criteria for the evaluation of flaws in nuclear piping in Section XI of the ASME Code were first published in 1983 and have been under revision for the past several years. This paper provides an overview of the procedures and acceptance criteria for pipe flaw evaluation in Section XI. Both planar and nonplanar flaws are addressed by Section XI. The evaluation procedures and acceptance criteria cover: failure by plastic collapse as characterized by limit load analysis; fracture due to ductile tearing prior to attainment of limit load, as characterized by elastic-plastic fracture mechanics (EPFM) analysis; and brittle fracture as characterized by linear elastic fracture mechanics (LEFM) analysis. A major revision to the evaluation procedures and acceptance criteria was published in the 2002 Addenda to Section XI. Evaluation procedures and acceptance criteria in the 2001 Edition, as well as the revisions in the 2002 Addenda, are described in this paper. Code Cases that address evaluation of wall thinning in piping systems, as well as temporary acceptance of flaws in moderate energy piping systems, are also described.

Copyright © 2003 by ASME

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