本标准规定了根据公众和工人的辐射和/或化学剂量和暴露水平对具有安全功能的SSC和SAC进行分类的标准。安全分类导致可靠设计、施工和运行所需的规范和标准符合安全分类。本标准的目的是:规定安全SSC的分类标准；选择与安全组织一致的可靠设计、施工和运行的行业规范和标准。为实现这些目标，本标准规定了以下步骤的要求:危险识别；危险评估；弱势商业企业的选择；弱势商业企业未缓解事故分析；识别安全功能和分类； 选择安全SSC以满足安全功能要求；评估、选择和实施适用的行业规范和标准，以确保安全SSC的设计、建造和维护符合预期的安全功能。

This standard specifies criteria for categorization of SSCs and SACs that have a safety function based on radiological and/or chemical dose and exposure levels for the public and workers. The safety categorization leads to codes and standards that are needed for reliable design, construction, and operations commesurate with the safety categorization.The purpose of this standard is:Specify criteria for categorization of safety SSCs;Select industry codes and standards for reliable design, construction, and operations commesurate with the safety organization.To meet these objectives, the standard specifies the requirements in the following steps:identification of hazards;evaluation of hazards;selection of DBEs;unmitigated accident analysis of DBEs;identification of safety functions and categorizations;selection of safety SSCs to fulfill safety function requirements;evaluation, selection, and implmementation of applicable industry codes and standards to ensure safety SSCs are designed, constructed, and maintained to fulfill the intended safety functions.