4.2.1-6 Multi-Unit Alarms

Alarms for any shared systems in multiple-unit plants should be duplicated in all control rooms.

Additional Information:
Multiple-unit NPPs may contain systems that are shared by two or more units. The status of any such equipment should be provided in all control rooms. When an item of shared equipment is being operated from one control room, a status display or signal should be provided in all other control rooms where the condition of the equipment is operationally relevant (e.g., other locations from which the equipment could be controlled).