As plants continue to age, modes of degradation are found that had not been anticipated as part of the design process. One of the most important modes of degradation found recently has been stress corrosion cracking. This presentation will deal with three examples of such cracking for which acceptance criteria and evaluation methodology are being developed for Section XI. These three include: • Class 1 piping; • Reactor Vessel Head Penetration Cracking (PWR only); • Low Energy Piping, Vessels and Tanks.

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