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Break Exclusion in French EPR: A Step by Step Analysis

[+] Author Affiliations
Claude Faidy

Electricité de France –SEPTEN, Villeurbanne, France

Paper No. PVP2010-25186, pp. 703-707; 5 pages
  • ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference
  • ASME 2010 Pressure Vessels and Piping Conference: Volume 6, Parts A and B
  • Bellevue, Washington, USA, July 18–22, 2010
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-49255 | eISBN: 978-0-7918-3878-5
  • Copyright © 2010 by ASME


After a lot of analysis in USA, USNRC has accepted a leak before break procedure developed in NUREG 1061 [4]. An updated version is under preparation in particular for operating plant to include field experience, but also for future plants. In France, EDF and AREVA have developed a new “break exclusion” methodology in 2 steps: - the safety consideration and defense in depth principle, - a modernized procedure to justify applications of break exclusion on a given system. Finally, large piping double-ended guillotine break are not considered in EPR-FA3 as a design transient. The Large Break Loss of Coolant Accident (LB-LOCA) is not considered as a design transient, only safety analysis with realistic data and methods are performed. For EPR-FA3, the larger break considered is the double end guillotine break of the surge line (16″ instead of 28 or 32″ ). The paper will present the details of these 2 step procedure and will discuss possible extension to other piping systems.

Copyright © 2010 by ASME



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