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Regulatory Aspects on the Application of the Leak Before Break Concept for Swedish Nuclear Power Plants

[+] Author Affiliations
B. Brickstad

Swedish Nuclear Power Inspectorate, Stockholm, Sweden

Paper No. PVP2008-61065, pp. 243-249; 7 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


The SKI regulation SKIFS 2004:2 allows for the use of Leak Before Break (LBB) as one way to provide assurance that adequate protection exists against the local dynamic consequences of a pipe break. The way to demonstrate that LBB prevails relies on a deterministic procedure for which a leakage crack is postulated in certain sections of the pipe based on the leak detection capability of the plant. It shall then be demonstrated that certain margins exist against the critical crack length at which a pipe break can be expected. In certain situations, probabilistic methods can strengthen the conclusion that LBB prevails. Then it is necessary to demonstrate that the likelihood of a pipe failure is sufficiently low and that there is a sufficient margin between a detectable leak and pipe rupture. This paper provides some general regulatory aspects on the application of LBB as well as results from two recently completed research projects. The first one is investigating the influence on the deterministic LBB-margins from different assumptions of the crack morphology. The second project provides information on failure probabilities for both leak and rupture for pipes of different sizes in Swedish PWR- and BWR-plants. The interest is focused on the conditional rupture probability corresponding to when the deterministic LBB-margins are fulfilled. Finally some results of failure probability for pipes with stress corrosion cracking are discussed.

Copyright © 2008 by ASME



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