Requirements for the containment system of nuclear power plants

1.1 This Standard applies to the containment system of existing and new water-cooled nuclear power plants. Notes: (1) ""Existing nuclear power plants"" refers to those licensed for operation prior to 2011. (2) The requirements for new builds and existing plants might differ. Where requirements differ for new builds and existing plants, the difference is explicitly stated. 1.2 This Standard was written as a companion document to CSA N290.0, which outlines general requirements for safety systems. This Standard, with its companion document, provides requirements for the design, qualification, installation, operation, maintenance, inspection, and documentation of a containment system. 1.3 In CSA Standards, ""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; ""may"" is used to express an option or that which is permissible within the limits of the standard; and ""can"" is used to express possibility or capability. 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.