Cathodic protection (CP) of complex underground structures at power plants requires special attention, especially for structures under the plant itself. Many of these structures are interconnected to reinforcing steel in the concrete slabs, creating a strong galvanic cell between buried steel and reinforcing rods. Shielding is also a problem. Installing concrete-encased steel along with locally placed CP groundbeds is effective. This article discusses design considerations for such corrosion protection measures. Connection to a copper grounding grid, another major problem, will be discussed in a future article but should not be forgotten.
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