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BWR Shroud Weld Off-Axis Crack Growth Investigation

[+] Author Affiliations
John E. Broussard

Dominion Engineering, Inc., Reston, VA

Wayne Lunceford

EPRI, Palo Alto, CA

Paper No. PVP2017-66151, pp. V06BT06A013; 6 pages
doi:10.1115/PVP2017-66151
From:
  • ASME 2017 Pressure Vessels and Piping Conference
  • Volume 6B: Materials and Fabrication
  • Waikoloa, Hawaii, USA, July 16–20, 2017
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5800-4
  • Copyright © 2017 by ASME

abstract

Recent inspections have identified cracking in the core shroud that is atypical in that the cracks exhibit characteristics inconsistent with traditionally reported intergranular stress corrosion cracking (IGSCC) occurring within stainless steel weld heat-affected zones (HAZs). These flaws are oriented transverse to the weld and are observed to propagate significantly beyond the weld HAZ. This paper describes the investigations which have been performed to quantify the likely limits on growth of these “off-axis” SCC cracks. The investigation includes welding residual stress analysis to determine the stress field present adjacent to the weld and crack tip SIF calculations for the bivariant stress field.

Copyright © 2017 by ASME

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