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Probabilistic Assessment of Dissimilar Metal Welds in CANDU Reactors

[+] Author Affiliations
Min Wang, Xinjian Duan

Atomic Energy of Canada, Limited, Mississauga, ON, Canada

Michael J. Kozluk

Independent Consultant, Oakville, ON, Canada

Paper No. PVP2011-57591, pp. 559-568; 10 pages
doi:10.1115/PVP2011-57591
From:
  • ASME 2011 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication, Parts A and B
  • Baltimore, Maryland, USA, July 17–21, 2011
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4456-4
  • Copyright © 2011 by Her Majesty The Queen in Right of Canada

abstract

Dissimilar metal welds (DMWs) involving Alloy 600 and its equivalent weld metal, such as Alloy 82 are used in a number of outlet feeders in CANDU® reactors. The higher operating temperature (∼300°C) leads to concerns that primary water stress corrosion cracking (PWSCC) might occur. This paper demonstrates the low rupture probability of DMWs due to PWSCC using probabilistic fracture mechanics (PFM) method with several critical assumptions validated by experiments. The leak-before-break is also demonstrated by comparison of the leak probability with rupture probability. A sensitivity study is carried out to investigate the effect of various factors on failure probabilities. Credible leak detection and action play an important role in limiting the rupture probability, while in-service inspection (ISI) has little effect to reduce rupture probability.

Copyright © 2011 by Her Majesty The Queen in Right of Canada
Topics: Metals , Welded joints

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