It is likely that the following factors contributed to Chloride stress corrosion cracking CLSCC in the reactors: • Residual stress from fabrication and welding • A rough surface finish leading to a long period of slow localised corrosion. • Initiation of CLSCC on the process side when the depth of corrosion pitting was ~1mm. • Short periods of rapid crack growth when the temperature ≥60°C during the cleaning cycles. • Long periods of very slow crack growth at the normal reactor operating temperature. • Periodic reactivation of cracking due to low frequency load cycles and the temperature excursions during cleaning.
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