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
