1、N290.5-06Requirements for electrical power and instrument air systems of CANDU nuclear power plantsLegal Notice for StandardsCanadian Standards Association (CSA) standards are developed through a consensus standards development process approved by the Standards Council of Canada. This process brings
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17、s of the contents hereof, and if you do make such copies, you are required to destroy them immediately. Use of this document constitutes your acceptance of the terms and conditions of this Legal Notice.Update No. 1N290.5-06November 2011Note: General Instructions for CSA Standards are now called Upda
18、tes. Please contact CSA Information Products Sales or visit www.ShopCSA.ca for information about the CSA Standards Update Service.Title: Requirements for electrical power and instrument air systems of CANDU nuclear power plants originally published December 2006The following revisions have been form
19、ally approved and are marked by the symbol delta () in the margin on the attached replacement pages:Revised Clauses 3, 4.1, 5.3.3.2.7, 5.6.3.2, and 7New Clauses 5.1.3.1, 5.1.3.2, 5.1.3.3, 5.1.7, and 7.4Deleted None Update your copy by inserting these revised pages.Keep the pages you remove for refer
20、ence.Blank page Canadian Standards AssociationRequirements for electrical power and instrument air systems of CANDU nuclear power plantsNovember 201162138:2004Nuclear power plants Instrumentation and control important for safety Software aspects for computer-based systems performing category B or C
21、functionsIEEE (Institute of Electrical and Electronics Engineers)336-2006IEEE Guide for Installation, Inspection, and Testing for Power, Instrumentation, and Control Equipment at Nuclear Facilities450-2002IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteri
22、es for Stationary Applications484-2002IEEE Recommended Practice for Installation Design and Implementation of Vented Lead-Acid Batteries for Stationary Applications485-1997 (R2003)IEEE Recommended Practice for Sizing Lead-Acid Batteries for Stationary Applications1106-2005IEEE Recommended Practice f
23、or Installation, Maintenance, Testing, and Replacement of Vented Nickel-Cadmium Batteries for Stationary Applications1115-2000IEEE Recommended Practice for Sizing Nickel-Cadmium Batteries for Stationary Applications1184-1994IEEE Guide for the Selection and Sizing of Batteries for Uninterruptible Pow
24、er Systems1188-2005IEEE Recommended Practice for Maintenance, Testing, and Replacement of Valve Regulated Lead-Acid (VRLA) Batteries for Stationary ApplicationsGovernment of CanadaNuclear Safety and Control Act, SC 1997, ch. 9, and Regulations3 DefinitionsThe following definitions apply in this Stan
25、dard:Act the Nuclear Safety and Control Act, which includes the Regulations and other applicable regulatory documents of the Canadian Nuclear Safety Commission.Availability the fraction of time that a component or system is able to function. Availability can also mean the probability that a componen
26、t or system will be able to function at any given time. Beyond design basis accident (BDBA) accident conditions that are less frequent and more severe than a design basis accident.Note: A BDBA might or might not involve core degradation.Buffering the techniques used to prevent faults or failures on
27、one circuit from affecting another circuit, where both circuits are interconnected.Channel an arrangement of interconnected components within a system that initiates a single output signal and that is independent of other interconnected components providing the same function.Note: An example of a ch
28、annel is the shutdown system parameter trip signal.3(Replaces p. 3, December 2006)N290.5-06 Canadian Standards AssociationNovember 2011Class I electrical system a dc system that is supplied from the Class III electrical system via rectifiers and from its own directly connected batteries.Note: A Clas
29、s I system ensures an uninterrupted supply sufficient for the applicable design basis accidents as specified by the nuclear safety requirements of the plant.Class II electrical system an ac and/or dc system that is supplied from the Class I electrical system via conversion equipment or from its own
30、batteries, with an alternate supply from the Class III electrical system.Note: A Class II system ensures uninterrupted supply sufficient for the applicable design basis accidents as specified by the nuclear safety requirements of the plant.Class III electrical system an ac system that is normally su
31、pplied from the Class IV electrical system. Upon the loss of Class IV power, a Class III electrical system is supplied from its own on-site standby generators to the extent necessary for the applicable design basis accidents as specified by the nuclear safety requirements of the plant.Class IV elect
32、rical system an ac system that is supplied from the turbine generator unit and/or the off-site electrical grid.Common-cause event a single event that affects multiple systems, components, structures, or procedures.Note: Common-cause events typically include(a) natural events such as earthquakes, flo
33、ods, lightning strikes, heavy rain and wind, hurricanes, tornadoes, snowstorms, icing, and freezing; and(b) technological or human-induced events such as maintenance, operating, or design error; turbine disintegration; large fires; radiation release; steam release from high-energy-pipe breaks; flood
34、ing from service water pipe breaks; transportation accidents via air (including aircraft impact), road, rail, or water; and external explosions or other industrial accidents.Component a discrete item from which equipment is assembled.Note: Examples of components include wire, transistors, resistors,
35、 relays, solenoids, pipe, and tubing.Design basis the set of assumptions that forms the basis for the requirements of a design.Design basis accident (DBA) a postulated accident defined by the plant safety report and used to establish the acceptable performance of systems, structures, and equipment.D
36、evice see Component.Distribution system an arrangement of components that connects sources of power to load groups. Distribution systems include associated protective relaying, instrumentation, and control devices.Notes: (1) An electrical distribution system includes buses, transformers, switching e
37、quipment, cables, rectifiers, and inverters. (2) An instrument air distribution system includes air storage tanks, valves, and piping.Diversity the characteristic of redundant equipment and/or systems that ensures the same function is achieved by different means.Division the designation applied to t
38、he part of an electrical system that enables the establishment and maintenance of physical, electrical, and functional independence from other redundant sets of components within the same electrical system.Note: Divisions are often referred to as odd and even power supplies.Electrical system an arra
39、ngement of electrical power sources, distribution systems, load groups, and all associated protective relaying, instrumentation, and controls.Emergency power supply (EPS) system an independent electrical system designed to operate following those DBAs for which normal (Group 1) electrical supplies a
40、re not designed.Note: An EPS system or some of its loads might normally be supplied from Group 1 power sources.(Replaces p. 4, December 2006)4 Canadian Standards AssociationRequirements for electrical power and instrument air systems of CANDU nuclear power plantsNovember 2011Separation sufficient ph
41、ysical distance between redundant equipment or systems to ensure that specified local events do not affect more than one redundant component.Note: Separation can also be achieved by barriers where physical space is limited.Service air system an air system used to provide compressed air to tools and
42、other equipment that does not require high-quality or high-reliability compressed air.System a set of structures, equipment, and components that are organized to accomplish a specified purpose.System service transformer a transformer that supplies power to the Class IV electrical system from the bul
43、k electrical system (electrical grid).Unit service transformer a transformer that supplies power to the Class IV electrical system from the units generator.4 General design considerations4.1 General design principlesThe following general design principles shall be considered in the design of electri
44、cal power and instrument air systems:Note: For the purposes of this Clause, “shall be considered” means that the user evaluates the impact and documents any decisions (e.g., no action, operating procedures, or design features).(a) Keep the systems simple (i.e., use the minimum amount of equipment ne
45、cessary).(b) Design for fail-safe operation where such an option exists, while maintaining a balance with simplicity. (c) Design systems such that, as a minimum, all nuclear safety functions remain available following a credible single failure or a single operator-induced fault within the electrical
46、 power and instrument air systems.(d) Design systems with sufficient redundancy, independence, and diversity to ensure that they perform their necessary functions with the required reliability as established by the plant design documentation. The assignment of electrical and instrument air loads to
47、a division shall be consistent with the plant system divisional separation in terms of mechanical, electrical, instrumentation, and control design aspects. Where divisional separation cannot be achieved, exceptions shall be dispositioned by the licensee to ensure that system reliability is not compr
48、omised.(e) In multi-unit plants, design those electrical power or instrument air systems that supply more than one unit from a common source such that the systems satisfy the nuclear safety and reliability requirements of the plant as defined by the plant design documentation.(f) Design the systems
49、to perform their necessary functions under the variations in environmental conditions (e.g., temperature, pressure, humidity, vibration, radiation, electromagnetic interference, plant feedback effects) to which system components are expected to be subjected during the life of the plant.(g) Design systems to avoid spurious system operations so as to prevent needless stresses on the nuclear plant and to maintain plant production.(h) Design the systems to facilitate on-line testing and maintenance.(i) Design systems to minimize
