IEEE 338-2012 pdf download lEEE Standard for Criteria for the Periodic Surveillance Testing of Nuclear Power Generating Station Safety Systems
3. Definitions
For the purposes of this document, the following terms and definitions apply. The IEEE Standard.
Dictionary: Glossary of Terms and Definitions’ should be consulted for terms not defined in this clause.
channel: An arrangement of components and modules as required to generate a single protective actionsignal when required by a generating station condition. A channel loses its identity where single protectiveaction signals are combined.
channel calibration: The adjustment of channel output such that it responds, with acceptable range andaccuracy, to known values of the parameter that the channel mcasures, and the performance of a functionatest.
channel check: The qualitative assessment, by observation, of channel behavior during operation. Thisdetermination includes, where possibl, comparison of the channel indication and status to other indicationsor status derived from independent instrument channels measuring the same parameter.
failure: The termination of the ability of an item to perform a required function.
functional test: A test to determine the ability of a component or system to perform an intended purpose orsafety function.
go/no-go: A set of terms (in colloquial usage) referring to the condition or state of operability of a unit thatcan only have two parameters: (A) go, functioning properly; or (B) no-go, not functioning properly.
limiting condition for operation (LCO): The lowest functional capability or performance level ofcquipment required for safe operation of the facility.
overlap testing: Overlap testing consists of channel, train, or load group verification by performingindividual tests on the various components and subsystems of the channel, train, or load group. Theindividual component and subsystem tests check common parts of adjacent subsystems, such that the cntircchannel, train, or load group is verified by testing of individual components or subsystems and by repetitivetesting of common parts of adjacent subsystems.
safely function: A process or condition (for example, cmergency ncgative reactivity insertion, postaccident heat removal,emergency core cooling, post-accident radioactivity removal, and containmentisolation) essential to maintaining plant parameters within acceptable limits established for a design basisevent.
safety group: A given minimal set of interconnected components, modules, and equipment thataccomplishes a safety function.
safety system: A system that is relied on to remain functional during and following design basis cvents toensure (A) the integrity of the reactor coolant pressure boundary; (B) the capability to shutdown the reactorand maintain it in a safe shutdown condition; or (C) the capability to prevent or mitigate the consequencesof accidents that could result in potential offsite exposures comparable with regulatory limits.
surveillance: The determination of the state or condition of a system or subsystem.
surveillance test: Pcriodic test to determinc the state or condition of a system or subsystem.