The need for operator acknowledgment of system-generated setpoint changes based on plant mode should be evaluated on a case-by-case basis.
Additional Information:
Alarm systems may alter setpoints in an effort to minimize nuisance alarms. While such changes may be associated with well-understood, easily recognizable plant conditions, others may be less familiar and not readily understood by plant personnel. In the latter situation, plant personnel may misunderstand the alarm information because they do not realize the setpoints have changed. When this situation is of concern, confirmation of the change should be considered.