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Benchmarking Probabilistic Code for LBB Analysis for Circumferential Cracks

[+] Author Affiliations
Robert E. Kurth, Cédric J. Sallaberry, Frederick W. Brust, Elizabeth Kurth

Engineering Mechanics Corporation of Columbus, Columbus, OH

Bruce A. Young, Paul Scott

Battelle Memorial Institute, Columbus, OH

Paper No. PVP2017-65384, pp. V01BT01A003; 7 pages
doi:10.1115/PVP2017-65384
From:
  • ASME 2017 Pressure Vessels and Piping Conference
  • Volume 1B: Codes and Standards
  • Waikoloa, Hawaii, USA, July 16–20, 2017
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5791-5
  • Copyright © 2017 by ASME

abstract

NRC Standard Review Plan (SRP) 3.6.3 describes Leak-Before-Break (LBB) assessment procedures that can be used to assess compliance with the 10CFR50 Appendix A, GDC-4 requirement that primary system pressure piping exhibit an extremely low probability of rupture. SRP 3.6.3 does not allow for assessment of piping systems with active degradation mechanisms, such as Primary Water Stress Corrosion Cracking (PWSCC) which is currently occurring in systems that have been granted LBB approvals.

There are several codes available for addressing the requirements of GDC-4. This paper addresses three of these codes: (1) xLPR 2.0; (2) PROLOCA; and (3) PROMETHEUS. Each of these codes is described and applied to a representative plant where active degradation mechanisms have been found. Conclusions about the design, results, and interpretation of the results is then provided. In all cases the probability of failure of the pipe is found to be extremely low when the crack inspections and leak detection systems are modeled.

Copyright © 2017 by ASME

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