C11 - CRD Flashcards
How much flow maintained in the CRD flow control station?
60 gpm
How much flow is allowed through the flow control valve in the closed position due to mechanical stop?
5 gpm
How does flow control valve react to changes in flow?
> 60 gpm valve closed
< 60 gpm valve opens
What powers ARI?
E and K
What powers the SCRAM valves?
RPS A and B
Where are the CRD pumps controlled from?
601 panel and remote shutdown panels
What’s the CRD pump trips?
> 6.4” Hg low suction pressure (approx 20’ in the CST)
< 3.0 low oil pressure
ESF load shed
MPD
What’s the purpose of the pressure control valve?
maintain drive water pressure 250 psig above Rx pressure
Maintain cooling water pressure < 20 psig about Rx pressure
What can high cooling water pressure cause?
Control rod drive
What will excessive drive water pressure cause?
internal damage to CRD drive mechanism
When does Aux oil pumps start for CRD?
3-5 psig AND pump breaker open
When does Aux oil pump trip?
10 psig
What’s the purpose of equalizing valves?
Prevents large DP on CRD piston
What does the SCRAM air header supply?
Air to SCRAM valves and SCRAM discharge volume (SDV) vent and drain valves, vents air on SCRAM signal
What pressures are HCUs charged to?
1250 psig water
1775 psig water/nitrogen