IEEE 387-1996 pdf download IEEE Standard Criteria for Diesel- Generator Units Applied as Standby Power Supplies for Nuclear Power Generating Stations
3. Definitions
3.1 acceptable: Demonstrated to be adequate by the safety analysis of the plant.
3.2 continuous rating (of diesel-generator unit): The electric power output capability that the dieselgenerator unit can maintain in the service environment for 8760 h of operation per year with only scheduledoutages for maintenance.
3.3 design basis events: Postulated events used in the design to establish the performance requirements ofthe structures and systems.
3.4 design load: That combination of electric loads (kW and kvar), having the most severe power demandcharacteristic, which is provided with electric energy from a diesel-generator unit for the operation otengineered safety features and other systems required during and following shutdown of the reactor.
3.5 diesel-generator unit: An independent source of standby electrical power that consists of a diesel-fuelecinternal combustion engine (or engines) coupled directly to an electrical generator (or generators); the associated mechanical and electrical auxiliary systems: and the control, protection, and surveillance systems.
3.6 engine equilibrium temperature: The condition at which the jacket water and lube oil temperatures areboth within + 5.5 °C (10 °F) of their normal operating temperatures established by the engine manufacturer.
3.7 load profile: The magnitude and duration of loads (kW and kvar) applied in a prescribed time sequenceincluding the transient and steady-state characteristics of the individual loads.
3.8 qualifed diesel-generator unit: A diesel-generator unit that meets the qualification requiremments of thisstandard.
3.9 redundant equipment or system: An equipment or system that duplicales the essential function ofanother equipment or system to the extent that either may perform the required function regardless of the
state of operation or failure of the other.
3.10 service environment: The aggregate of conditions surrounding the diesel-generator unit in itsenclosure, while serving the design load during normal, accident, and post-accident operation.
3.11 short-time rating (of diesel-generator unit): The electric power output capability that the diesel-generator unit can maintain in the service environment for 2 h in any 24 h period, without exceeding themanufacturer’s design limits and without reducing the maintenance interval established for the continuousrating.
NOTEOperation at this hieher rating does not limit the use of the diesel-generator unit at its continuous rating
3.12 standby power supply: The power supply that is selected to furnish electric energy when the preferredpower supply is not available.
3.13 start-diesel signal: That input signal to the diesel-generator unit start logic that initiates a dieselgenerator unit start sequence.
3.14 surveillance: The deterinination of the state or condition of a system or subsystem
IEEE 387-1996 pdf download
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