CSA N290.12-14

1.1 This Standard covers HF in design for existing and new NPPs. Notes: 1) This Standard applies to new designs or modifications, large and small, temporary and permanent, to internally and externally engineered solutions, and to commercial off-the-shelf (COTS) products. 2) This Standard may provide guidance for nuclear facilities other than NPPs, using a graded approach. 1.2 This Standard covers HF in design activities related to construction, commissioning, operation, maintenance, inspection, testing, and decommissioning. 1.3 This Standard applies to HF in design for the following plant states: a) normal operation; b) anticipated operational occurrences (AOOs); c) design basis accidents (DBAs); and d) design extension conditions (DECs) as a subset of beyond design basis accidents (BDBAs). 1.4 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.