sequencer Flashcards
Sequencer
What turns on after 5 seconds?
A/B/C SI pump starts
(B only if racked in)
SI only
Sequencer
What turns on after 15 seconds?
A/B RHR pumps start
SI only
Sequencer
What turns on after 20 seconds?
A/C SW pumps start
(Signal to start both SWBPs. SI auto start, SBO waits until 30psig in SW header)
Both SI and SBO
Sequencer
What tuns on after 25 seconds?
B/D SW pumps start
(Signal to start both SWBPs. SI auto start, SBO waits until 30psig in SW header)
Both SI and SBO
Sequencer
What turns on after 30 seconds?
1/3 HVH units start on SI
CCW pump B/C start on SBO
Sequencer
What turns on after 35 seconds?
2/4 HVH units start
SI only
Sequencer
39.5 seconds?
A/B AFW starts
Both SI and SBO
List the SI sequencer
5 sec- A/B/C SI pumps
15 sec- A/B RHR pumps
20 sec- A/C SW pumps (SWBPs)
25 sec- B/D SW pumps (SWBPs)
30 sec- 1/3 HVH units
35 sec- 2/4 HVH units
39.5 sec- A/B AFW pumps
List the SBO sequencer
20 sec- A/C SW pumps (SWBPs with 30psig)
25 sec- B/D SW pumps (SWBPs with 30psig)
30 sec- B/C CCW pumps
39.5 sec- A/B AFW pumps
What happens if a safety injection singal comes in while a blackout sequence is in progress?
- If the EDG output breaker is closed, the SI squence will start and the SBO signal is blocked and stops.
Which sequencer sheds loads?
Blackout
What loads are not shed on a blackout?
MCC-5/16
What turns off a CCW pump?
Having 3 signals, UV, SI, and Spray
What turns off charging pump?
UV and SI
SI Sequencer must have what to start?
Power on respective bus
Blackout sequencer starts
When power on the bus is gone
When will A CCW pump start if it was not already running?
Low pressure if power is availble on DS bus
