4.2.6.2-8 Suppressed Visual Codes

If the visual codes indicating alarm status are automatically suppressed or delayed during high alarm volume conditions or the presence of more important alarms, they should be automatically presented after the more important alarms have been addressed.

Additional Information:
Under high alarm volume conditions, the designer may consider suppressing or delaying the alerting indications (e.g., visual flashing) for those alarm conditions that (1) do not require immediate response, and (2) do not indicate a challenge to plant safety and technical specifications. This will assist operators in detecting the more significant alarm messages and reduce distraction from less important ones. Plant personnel should not be required to remember to request alarms that have been automatically suppressed.