Are auditory and visual alert signals
The purpose of auditory and visual alert signals is to attract the operators' attention to a deviation. The use of flashing (or blinking) should be limited. E.g., in alarm messages, only a small symbol should be flashing. Text should never flash. Instead of flashing, other effects could be used that are less disturbing to the eye (i.e. raised face / 3D-effects that highlight new alarms). Operators should be able to easily distinguish between system alarms, process alarms and events.
Note to point B - in some cases there could be just one operator alone in the CC, can he perceive all alarms?
Comments/Recommendations
NUREG0700, point 4.2.3-1, p. 272., NUREG0700, point 4.6-1, p. 299YA-711, point 35, 36, 39, p. 19-20.
DC: Applicable to the DC