"This safety notice describes a specific degradation mechanism found inside stainless steel thermowells operating where the external atmosphere contains halides, as is typical in coastal locations or near to cooling towers. Thermowells can 'breathe' during normal operation as vessels heat up and cool down, drawing in the external atmosphere through non gas tight fittings. If the atmosphere contains halides this can leave any stainless steel susceptible to Chloride Stress Corrosion Cracking (CISCC). The HSL Research Report 902 (Reference 1) covers the susceptibility of stainless steel to CISCC in some detail and links to other research papers and published documents".
Read the full safety alert in this link https://www.hse.gov.uk/safetybulletins/thermowell-corrosion.htm
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