Nuclear plants have received United States Nuclear Regulatory Commission (NRC) approval to use polyethylene pipe in safety related systems such as essential service water systems. ASME Code Case N-755 is the basis for the utility requests. ASME Nuclear Code committees are developing a revision to provide clarification to the code case requirements and address NRC concerns. Polyethylene pipe replacement projects provide a solution to the age degradation issues such as corrosion and fouling of buried carbon steel pipe.

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