What caution appears when VARTOMS fails?

• A. VAR NR
• B. NR VAR
• C. VARTOMS fault
• D. No caution

Answer: (A)

The guard/indicator concept being tested is how the plant’s annunciation flags a failed subsystem. When VARTOMS isn’t functioning, the system shows a caution labeled as VAR NR, meaning VAR is Not Ready. This signals to the operator that the voltage/VAR regulation function provided by VARTOMS isn’t available at the moment, so automatic voltage control may be diminished and manual monitoring or intervention is required. It’s a warning, not a fault that would trip the plant, which is why the exact caut ion code is VAR NR rather than a fault message. The other options would imply a different kind of status or no status at all, which isn’t what the indication communicates.