EHC Flashcards
Unit 1 is at 90% power with all systems in a normal lineup.
The LOAD LIMIT LIMITING light is on.
The CO turns the load limit potentiometer clockwise one turn.
The LOAD LIMIT LIMITING light is now off.
Turbine load increased ___(1)___. Turbine load is now limited by ___(2)___.
A. (1) at the loading rate limit; (2) the load limit potentiometer
B. (1) as fast as the potentiometer was turned; (2) the load limit potentiometer
C. (1) at the loading rate limit; (2) the load set motor
D. (1) as fast as the potentiometer was turned; (2) the load set motor
D
In shell warming, the main turbine combined intercept valves are \_\_\_(1)\_\_\_, and the control valves are \_\_\_(2)\_\_\_. A. (1) open; (2) open B. (1) closed; (2) open C. (1) open; (2) closed D. (1) closed; (2) closed
B
In chest warming, the main turbine combined intercept valves are \_\_\_(1)\_\_\_, and the control valves are \_\_\_(2)\_\_\_. A. (1) open; (2) open B. (1) closed; (2) open C. (1) open; (2) closed D. (1) closed; (2) closed
D
Unit 3 is at 100% power.
The main turbine standby light is on.
All other systems are in a normal lineup.
‘A’ Main Feedwater Pump trips.
How will the main turbine respond?
A. The turbine will setback and runback.
B. The turbine will setback ONLY.
C. The turbine will runback ONLY.
D. The turbine will not setback and will not runback.
D
Unit 2 is at 100% power with all systems in a normal lineup.
NNN-D12 develops a ground and is de-energized.
Subsequently, the ‘B’ Main Feedwater Pump trips.
With no operator action, one minute later, which signal is limiting the main turbine?
A. Load set motor
B. Load limit potentiometer
C. Setback
D. Standby potentiometer
C
What are the normal and backup power supplies to the main turbine control (EHC) system while at 100% power? A. Normal: NNN-D15, Backup: PMG B. Normal: PMG, Backup: NNN-D15 C. Normal: NNN-D15, Backup: NNN-D16 D. Normal: NNN-D16, Backup: NNN-D15
B
