Regional Basic Professional Training Course in Korea

6. Safety Classification Of Structures, Systems and Components
6.5. ELECTRICAL EQUIPMENT CLASSIFICATION
6.5.1. Class 1E
Class 1E shall apply to the instrumentation channel electrical equipment from the sensors
and transmitters up to and including the actuators, as well as associated power supplies.
Under certain conditions, the I&C for these channels may be classified into Non Class IE.
Class 1E shall thus include: electrical power supplies; motors; valve operators; solenoid
valves; on‐site power distribution networks; instrumentation.
6.5.1.1. Definition of class 1E
Class 1E covers systems and equipment performing safeguard functions and necessary for:
− reactor trip;
− reactor containment isolation;
− emergency core cooling;
− removal of residual heat from the reactor and the reactor building;
− prevention of accidents or limitation of their radiological consequences.
These functions must be ensured even when postulating a single failure affecting a
system participating in the accomplishment of these functions and when postulating the
failure of the main grid.
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