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This document provides an overview of the requirements of Welding Requirements CSA-N287.4 Construction, fabrication, and installation requirements for concrete containment structures for CANDU nuclear power plants with respect to welding. It is designed to provide guidance for individuals and organizations involved in the construction, fabrication, and installation requirements that apply to concrete containment structures of a containment system designated as class containment components, parts, and appurtenances for CANDU nuclear power plants.

This document is only for general guidance purposes; reference to the full text of CSA N287.4 should be made.