scope:

General

This standard presents accepted methods and practices regarding the use of CP for the control of external corrosion on buried or submerged carbon steel, stainless steel, gray cast iron, ductile cast iron, copper, and aluminum piping systems at nuclear power plants. It is not intended for CP of pre-stressed concrete cylinder pipe (PCCP) or other reinforced concrete pressure pipes. Additional guidance regarding the design, installation and testing of CP systems for PCCP and other reinforced concrete pressure pipes can be found in NACE SP0100, "Cathodic Protection to Control External Corrosion of Concrete Pressure Pipelines and Mortar-Coated Steel Pipelines for Water and Waste Water Service."3 This standard may be useful at facilities other than nuclear power plants, which contain complex networks of buried or submerged piping, which may be composed of more than one material and may or may not be grounded.

This standard addresses the design of CP systems in nuclear power plants for new piping systems, existing coated piping systems and existing uncoated piping systems. For each type of system, information is provided concerning the effects of grounding of the piping system to be protected on the design of the CP system. This standard also introduces design concepts for new piping systems, which will assist in the design, operation, testing, or maintenance of a CP system (Sections 5 and 6).

This standard also presents accepted methods and practices for the installation, operation (including acceptance criteria), testing, and maintenance of CP systems in nuclear power plants (Sections 7 and 8).

This standard presents criteria and procedures which may be used to determine the conditions under which a pipe or piping system need not be cathodically protected (Section 4).

The provisions of this standard are intended to be applied under the direction of competent persons who, by reasons of knowledge of the physical sciences and the principles of engineering and mathematics, acquired by education and related practical experience, are qualified to engage in the practice of corrosion control on buried or submerged metallic piping systems.

Note: Such persons might be, but are not limited to, registered professional engineers or persons recognized as Corrosion Specialists or CP Specialists by NACE International Institute, if their professional activities include suitable experience in external corrosion control of buried or submerged metallic piping systems.

Deviation from this standard might be warranted in specific situations, provided that the responsible corrosion control personnel are able to demonstrate that the objectives expressed in this standard have been achieved.

This standard is not intended for use in the control of internal corrosion of buried or submerged piping systems.

This standard is written using U.S. regulatory definitions and wording. Other nations may have similar but not identical definitions and wording to describe their specific regulatory requirements.