本推荐规程提供了核电厂系统描述的单一来源，以及有关唯一识别原则和定义、部件功能标识符和实施说明的相关推荐规程，构成了唯一识别系统、结构和设备的概念，以及轻水核电站项目（发电站）和相关设施的组件。本版本不包括化石、水力和其他类型的发电厂。

This recommended practice provides a single source of nuclear power plant system descriptions which, along with related recommended practices concerning unique identification principles and definitions, component function identifiers, and implementation instructions, makes up a concept for uniquely identifying systems, structures, and components of light water nuclear power plant projects (electric power generating stations) and related facilities. Fossil, hydro, and other types of power plants are not included in this edition.