IEEE 308-2020 pdf free download. IEEE Standard Criteria for Class 1E Power Systems for Nuclear Power Generating Stations.
IEEE 308-2020 applies to the Class 1E portions of the following systems and equipment in single-unit and multiunit nuclear power generating stations: — Alternating current (ac) power systems — Direct current (dc) power systems — Instrumentation and control (I&C) power systems This standard does not apply to the preferred power supply; the unit generators and their buses; generator breaker; step-up, auxiliary, and start-up transformers; connections to the station switchyard; switchyard; transmission lines; and the transmission network (see Figure 2 and Figure 3).
4. Principal design criteria
4.1 General
Class IE power systems shall be designed to provide that no design basis event causes the following
A loss of electric power to a number of engineered safety features, surveillance devices, or protection system devices so that a required safety function cannot be performed.
A loss of electric power to equipment that could result in a reactor transient capable of causing
significant damage to the fuel cladding or to the reactor coolant pressure boundary.
4.2 Relationship between the safety system and Class 1E power system
The portions of the Class IE power system that are required to support safety systems in the performance of their safety functions shall meet the requirements of IEEE Std 603.
Other components, equipment, and systems within Class IE power systems that have no direct safety function Ind are provided only to increase the availability or reliability of the Class IE power system shall meet the requirements in IEEE Std 603 to confirm that these comnonents, equipment, and systems do not degrade the Class IE power system below an acceptable level.