This standard applies to the Class 1E portions of the following systems and equipment in single unit and multiunit nuclear power generating stations: (1) Alternating current power systems (2) Direct current power systems (3) Vital instrumentation and control power systems (4) Protective action systems.

This standard applies to the Class I E portions of the following systems and equipment in single unit and multi-unit nuclear power generating stations: ( 1 ) Alternating current power systems ( 2 ) Direct current power systems ( 3 ) Vital instrumentation and control power systems ( 4 ) Protective action systems These systems include those items listed in Table 1

The purpose o f this standard is t o provide: ( 1 ) The principal design criteria and the design features of the Class I E power systems that enable the systems to meet their functional requirement under the conditions produced by the applicable design basis events ( 2 ) The requirements for surveillance of the Class IE power systems