IEEE 603-2018 pdf download

IEEE 603-2018 pdf download.IEEE Standard Criteria for Safety Systems for Nuclear Power Generating Stations.
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.
NOTE—Adivision can have one or more channels.
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.
NOTE—In some instances, protective actions may be performed by execute features that respond directly to the process conditions (for example, check valves, self-actuating relief valves).
maintenance bypass: Removal of the capability of a channel, component, or piece of equipment to perform a protective action due to a requirement for replacement, repair, test, or calibration.
NOTE—A maintenance bypass is not the same as an operating bypass. A maintenance bypass may reduce the degree of redundancy of equipment, but it does not result in the loss of a safety function.
module: Any assembly of interconnected components that constitutes an identifiable device, instrument, or piece of equipment. A module can be disconnected, removed as a unit, and replaced with a spare. It has definable performance characteristics that permit it to be tested as a unit. A module could be a card, a drawout circuit breaker, or other subassembly of a larger device, provided it meets the requirements of this definition.
operating bypass: Inhibition of the capability to accomplish a safety function that could otherwise occur in response to a particular set of generating conditions.
NOTE—An operating bypass is not the same as a maintenance bypass. Different modes of plant operation may necessitate an automatic or manual bypass of a safety function. Operating bypasses are used to permit mode changes (e.g., prevention of initiation of emergency core cooling during the cold shutdown mode).
power sources: The electrical and mechanical equipment and their interconnections necessary to generate or convert power.
protection system: The part of the sense and command features involved in generating those signals used for the reactor trip system and engineered safety features.
protective action: The initiation of a signal within the sense and command features or the operation of equipment within the execute features for the purpose of accomplishing a safety function.
redundant equipment or system: A piece of equipment or a system that duplicates the function of another piece of equipment or system to the extent that either may perform the required function, regardless of the state of operation or failure of the other.
safe shutdown: Bringing the nuclear generating station to controlled stable shutdown conditions specified in licensing basis documentation.
safety function: One of the processes or conditions (for example, emergency negative reactivity insertion, post-accident heat removal, emergency core cooling, post-accident radioactivity removal, and containment isolation) essential to maintain plant parameters within acceptable limits established for a design basis event.
NOTE—Asafety function is achieved by the completion of all required protective actions by the reactor trip system or the engineered safety features concurrent with the completion of all required actions by the auxiliary supporting features, or both. (SeeAnnex Afor an illustrative example.)
safetygroup: Agiven minimal set of interconnected components, modules, and equipment that can accomplish a safety function.
NOTE—Asafety group includes one or more divisions. (SeeAnnexAfor an illustrative example.)
safety system: A system that is relied upon to remain functional during and following design basis events to assure one of the following:
a) The integrity of the reactor coolant pressure boundary
b) The capability to shut down the reactor and maintain it in a safe shutdown condition
c) The capability to prevent or mitigate the consequences of accidents that could result in potential offsite exposures comparable to regulatory guidelines
sense and command features: The electrical and mechanical components and interconnections involved in generating those signals associated directly or indirectly with the safety functions. The scope of the sense and command features extends from the measured process variables to the execute features’input terminals.
sensor: The portion of a channel that responds to changes in a plant variable or condition and converts the measured process variable into a signal suitable for use in the remainder of the
channel.