Application of the Safety Classification of Structures, Systems and Components in Nuclear Power Plants

Abstract

This publication describes how to complete the tasks associated with every step of the classification methodology set out in SSG-30 — in particular, how to capture all the SSCs to be safety classified. Emphasis is placed on the SSCs that are necessary to limit radiological releases to the public and occupational doses to workers in operational conditions. SSCs are expected to be classified to ensure that that they will be designed, manufactured, installed and operated with established processes in a way that their reliability and quality will be commensurate with their safety significance. To make certain that the classification of SSCs is established in a consistent manner, this publication emphasises the need to identify first all the required safety functions to be accomplished for all of the plant states. Examples of design and manufacturing requirements associated with the different safety classes to reach the expected reliability and quality are also provided. This publication provides information for organizations establishing a comprehensive safety classification of SSCs compliant with IAEA recommendations, and to support regulators in reviewing safety classification submitted by licensees.