Scope 1.1 This standard applies to the design, qualification, installation, commissioning, operation, maintenance, testing, inspection and documentation of the systems that ensure the removal of heat from the reactor core to the ultimate cold source(s) for water-cooled nuclear power plants during shutdowns. 1.2 This standard only applies to fuel cooling in the reactor core; it does not apply to the cooling of spent fuel, to refueling outside the reactor or to the reactor from which fuel has been removed. 1.3 The word “shutdown” applies to the following reactor conditions: a) a subcritical shutdown state ensured by physical means; or Note: In the case of CANDU reactors this is a guaranteed shutdown state. b) a critical or subcritical shutdown state regardless of power when normal heat sources (at high power) are not the primary heat source. Note: Steam injection into turbines or condensers are examples of high power cold sources. 1.4 In the context of this standard, shutdown begins when normal high power heat sources are no longer considered the primary heat source. The shutdown is considered complete when the normal high power heat sinks return to being part of the high power operation. 1.5 This standard applies to all systems which contribute to the transfer of heat a) by the transport of heat to the ultimate cold source; b) by supplying energy or compressed air; c) maintaining the inventory of cold sources; or (d) by surveillance and control. Note: The term “cold sources” used in this standard applies to the combination of systems or portions of systems that contribute to these functions. 1.6 In this standard, the term “shall” indicates a requirement, that is, a requirement that the user must comply with to ensure compliance with the standard; “should” indicates a recommendation or what is advisable but not obligatory to do; and “may” indicates a possibility or what is permitted to be done. The notes that accompany the articles do not include prescriptions or recommendations. They are used to separate from the text explanations or information that are not properly part of the standard. Notes at the bottom of figures and tables are part of these and can be written as prescriptions. The annexes are qualified as normative (mandatory) or informative (optional) to clarify their application.
CSA N290.11-13:2014 history
2014CSA N290.11-13:2014 Requirements for reactor heat removal capacity during shutdown of nuclear power plants