Air Removal Flashcards
What cools the Air Removal pumps
Turbine Cooling Water
Describe the Holding mode of operation of the Air Removal pumps.
Inlet gas is compressed in the first stage and discharged to the second stage inlet. Second stage inlet compresses gas to just above atmospheric pressure and discharges to the moisture separator.
Describe the Hogging flowpath of the Air Removal pumps.
Inlet gas is compressed and discharged directly to the moisture separator.
Describe the starting sequence of the Air Removal pump.
- Control switch taken to start in the control room
- Breaker closes, starting the pump
- Open permissive sent to the pumps suction isolation valve
- Start signal sent to the seal water recirc pump
- After a bit of time, the discharge valve opens
Describe the stopping sequence of the condenser Air Removal pumps.
- Switch taken to stop in the control room
- Breaker opens, stopping the pump
- Close signal sent to the suction isolation valve
- Stop signal sent to its seal water recirc pump
What conditions will start the D Air Removal pump?
Low vacuum in the respective condenser shell:
A = 4.2”
B = 4.8”
C = 5.3”
Once the pump starts, it will align to the shell with the low vacuum
Explain how the condenser Air Removal post-filter operates.
- There are inlet, outlet, and bypass valves (air operated, NKN-D41)
- Thru Filter Mode = inlet & outlet open, bypass closed (same thing on a loss of air/power)
- Filter blower starts
- Red light on B07 = filter blower has a start signal and valves hit their open limit switches
