Microbial induced corrosion (MIC) relevant to nuclear power plant systems is reviewed. The long construction times associated with nuclear plants and the large number of redundant or standby systems where water is allowed to remain stagnant for long periods of time produce conditions under which MIC can occur. Carbon and low alloy steels, stainless steels, and copper alloys are all susceptible to MIC in raw water applications. Methods for diagnosis, treatment, and prevention of MIC during construction, operation, and lay-up are discussed. Visual examination is noted to be particularly useful in performing preliminary assessments of MIC.

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