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Flow Accelerated Corrosion: The Entrance Effect

[+] Author Affiliations
Andy Barth

South Carolina Electric & Gas, SC, USA

Harold M. Crockett

Electric Power Research Institute (EPRI), NC, USA

Lee F. Goyette

Pacific Gas & Electric, CA, USA

Jeffrey S. Horowitz

Consultant, MA, USA

Robert Montgomery

PSEG Nuclear, Newark, NJ

Paper No. PVP2008-61185, pp. 873-882; 10 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


Flow-accelerated corrosion (FAC) is a degradation process that attacks carbon and low-alloy steels. The process has been studied extensively for the last thirty years. Nevertheless piping leaks and ruptures continue to occur. Recent fatal accidents at the Mihama nuclear station in Japan and at the Iatan fossil unit in Missouri demonstrate that plant operators must continue to maintain mitigation programs in order to maintain a high degree of confidence against unanticipated pipe rupture caused by FAC. While FAC is a complex phenomenon, most of its controlling elements are fairly well understood with U.S. nuclear plants using well-developed analytical methods to increase the efficacy of their inspection programs. However, there remains one particular controlling element — described 10 years ago — that is still not widely included in plant inspection programs. This is the entrance effect (or leading-edge effect), which refers to the accelerated attack downstream of a FAC resistant material to FAC susceptible material joint (e.g., a butt weld). This paper provides an update to the previous PVP Conference paper on this subject [1]. Recent plant experience, developments in analysis and the implications to existing plant programs will be discussed.

Copyright © 2008 by ASME



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