IEEE Std 308 pdf free download
IEEE Std 308 pdf free download.Class 1E Power Systems for Nuclear Power Generating Stations.
administrative controls: Rules, orders, instructions, procedures, policies, practices, and designations of authority and responsibility.
auxiliary supporting features: Systems or components that provide services (e.g., cooling, lubrication, energy supply) that arc required for the safety systems to accomplish their safety functions.
channel: An arrangement of components and modules required to generate a single protective action signal when required by a generating station condition. A channel loses its identity where single protective action signals are combined.
Class I E: The safety classification of the electric equipment and systems that are essential to emergency reactor shutdown, containment isolation, reactor-core cooling, and containment and reactor heat removal or that are otherwise essential in preventing significant release of radioactive material to the environment.
NOTE Users of this standard are advised that ebClass I E” is a functional term. Equipment and systems are to be classified Class I E only if they fulfill the functions listed in the definition. Identification of systems or equipment as Class I E based on anything other than their function is an improper use of the term and should be avoided.
design basis events: Postulated events used in the design to establish the acceptable pertbrrnance requirements of the structures, systems, and components.
detectable failures: Failures that can be identified through periodic testing or can be revealed by alarm or anomalous indication. Component failures that are detected at the channel, division, or system level are detectable failures.
NOTE—Identifiable but nondetectable failures arc failures identified by analysis that cannot be detected through surveillance testing or cannot be revealed by alarm or anomalous indication.
division: The designation applied to a given system or set of components that enables the establishment and maintenance of physical, electrical, and functional independence from other redundant sets of components.
documentation: Any written or pictorial information describing, defining, specifying, reporting, or certifying activities, requirements, procedures, or results.
engineered safety features: Features of a unit, other than reactor trip or features used only for normal operation, that are provided to prevent, limit, or mitigate the release of radioactive material.
execute features: The electrical and mechanical equipment and interconnections that perform a function, associated directly or indirectly with a safety function, upon receipt of a signal from the sense and command features. The scope of the execute features extends from the sense and command features output to and including the actuated equipment-to-process coupling.
independence: The state in which no mechanism exists by which any single design basis event can cause redundant equipment to be inoperable.
isolating device: A device in a circuit that prevents malfunction in one section of a circuit from causing unacceptable influences in other sections of the circuit or in other circuits.
load group: An arrangement of buses, transformers, switching equipment, and loads fed from a common power supply within a division.
verification and validation: The process of determining whether the requirements for a system or component are complete and correct, the products of each development phase fulfill the requirements or conditions imposed by the previous phase, and the final system or component complies with specified requirements.IEEE Std 308 pdf download.
