CSA N290.5-16

1.1 This Standard covers the design, procurement, qualification, construction, installation, testing, commissioning, and documentation of CANDU nuclear power plant electrical power and instrument air systems. 1.2 Electrical power and instrument air systems of CANDU nuclear power plants include all structures, systems, and components that are necessary to meet the plant design requirements, including the requirements for design extension conditions (DECs). 1.3 Electrical power systems consist of the Class I, II, III, IV, and other electrical systems that are required to meet the plant design requirements. 1.4 Instrument air systems consist of the components of the plant instrument air system and other provisions to provide compressed gas that is necessary to meet the plant design requirements. 1.5 This Standard was developed specifically for CANDU nuclear power plant designs and satisfies the applicable requirements of CNSC REGDOC-2.5.2. 1.6 In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.