IEEE 334:1974 pdf download.IEEE Standard for Type Tests of Continuous Duty Class 1E Motors for Nuclear Power Generating Stations.
IEEE 334 provides direction in demonstrating the adequacy of continuous duty Class 1E electric motors, both inside and outside the containment of nuclear power generating stations, to perform all of their required Class 1E functions under all required service conditions.
2. Definitions
accessory equipment. Devices other than the principal motor components that are furnished with or built as a part of the motor structure and are necessary for the operation of the motor.
auxiliary equipment. Equipment that is not part of the motor but is necessary for the operation of the motor.
Class 1E. 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 are otherwise essential in preventing significant release of radioactive material to the environment.
containment. That portion of the engineered safety features designed to act as the principal barrier after the reactor system pressure boundary to prevent the release, even under conditions of a reactor accident, of unacceptable quantities of radioactive material beyond a controlled zone.
design basis events. Postulated abnormal events used in the design of nuclear power generating stations to establish the performance requirements of the structures and systems of the station.
design basis event conditions. Conditions calculated to occur as a result of the design basis events.
design life. The time during which satisfactory performance can be expected for a specific set of service conditions upon which design margins are based.
installed life. The interval from installation to removal, during which the equipment or component thereof may be subject to design service conditions and process demands.
NOTE: A motor may have an installed life of 40 years with certain components of the motor changed periodically; thus, the installed life of the components would be less than 40 years.
3. Equipment Specifications
Motor design criteria and qualification procedures for the required Class 1E functions shall be chosen to equal or exceed the requirements of the service conditions specified for the plant. In some plants motors need operate for only a few days under design basis event conditions. In other plants, motors may have to keep running for far longer periods, or under different conditions. Therefore, each user of this standard should select the requirements that shall be met and prepare his specification accordingly.IEEE 334 pdf download.