Design of emergency power systems for nuclear power plants. Safety guide

This Safety Guide was prepared under the IAEA programme for establishing safety standards for nuclear power plants. The basic requirements for the design of safety systems for nuclear power plants are provided in the Safety Requirements publication, Safety Standards Series No. NS-R-1, Safety of Nuclear Power Plants: Design, which it supplements. The objective of this Safety Guide is to elaborate on the requirements for ensuring the reliability of the EPSs as established in paras 6.88/6.89 of Ref. It is intended for the use of those involved in the design, operation, assessment and licensing of EPSs, including designers, safety assessors, regulators and operators. The Safety Guide makes recommendations and gives guidance on the provisions necessary for both new and operating nuclear power plants to meet the requirements relating to the functions of EPSs.This Safety Guide describes how the requirements should be met in the design of emergency power systems (EPSs) for nuclear power plants. This publication is a revision of a previous Safety Guide issued in 1991 as Safety Series No. 50-SG-D7 (Rev. 1), Emergency Power Systems at Nuclear Power Plants, and supersedes it. The revision takes account of developments in the design of EPSs in nuclear power plants since the earlier Safety Guide was published in 1991 and includes recommendations and guidance on nonelectrical power sources