本标准介绍了核电厂埋地或浸入式碳钢、不锈钢、灰铸铁、球墨铸铁、铜和铝管道系统外部腐蚀控制中使用阴极保护（CP）的公认方法和实践。本标准可能适用于核电厂以外的设施，这些设施包含复杂的埋地或水下管道网络，这些管道可能由一种以上的材料组成，可能接地，也可能不接地。本标准涉及核电厂新管道系统和现有涂层和未涂层管道系统的CP系统设计。 对于每种类型的系统，提供了有关管道系统接地对CP系统设计的影响的信息。它还介绍了新管道系统的设计概念，这些概念将有助于CP系统的设计、操作、测试或维护。本标准还介绍了核电厂CP系统安装、运行（包括验收标准）、测试和维护的公认方法和实践。它提出了可用于确定管道或管道系统不需要阴极保护的条件的标准和程序。

This standard presents accepted methods and practices regarding the use of cathodic protection (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. This standard may be useful at facilities other than nuclear power plants that 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 and existing coated and uncoated piping systems. For each type of system, information is provided concerning the effects of grounding of the piping system on the design of the CP system. It also introduces design concepts for new piping systems that will assist in the design, operation, testing, or maintenance of a CP system.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. It presents criteria and procedures that may be used to determine the conditions under which a pipe or piping system need not be cathodically protected.