EMERGENCY FEED Flashcards
OTSG level control valves (EF-V-30A/B/C/D)
Power supply
EF-V-30A/C -> VBA
EF-V-30B/D -> VBB
OTSG level control valves (EF-V-30A/B/C/D)
Failure position
Closed on loss of air and DC
EFW Block Valves (EF-V-52A/B/C/D)
Location, purpose
Located downstream of the EF-V-30s. manual isolation for EF-V-30s for EF-V-30s if they fail OPEN.
EFW Nozzles
Number per OTSG, purpose
7 per OTSG
Elevates thermal center of OTSG to promote establishment of natural circulation and reduces thermal stress on the lower tubesheet.
EF-P-2A
EF-P-2B
Power supply
1D 4kv ES bus
1E 4kv ES bus
Emergency Feed Pump
Start signals
Loss of all 4 RCPs (50% op range)
Loss of both fd pumps (<75 psig oil press) (25 S/U range
4# RB press 2/4 ( 25 S/U range)
10 OTSG level (25 S/U range)
MS-V-13 A Opens first then what? Why?
53 second time delay on opening on MS-V-13B
Prevents overspeeding turbine
Ms-V-13s
Loss of DC power and loss of air failed position?
Fail Open
MS-V-10s
Used for low steam supply pressure conditions, IF both OTSGs < what pressure and aux steam not available
Jog MS-V-10A and 10B to maintain > what RPM
<200 psig
>3300 RPM
When in local, thumb wheel automatically controls OTSG level to desired setpoint. What does the right black needle indicate?
Indicates local setpoint
Header Cross-connects (EF-V-1A/B, EF-V-2A/B)
Bkrs left what position at power? (app R)
EF-V-1A bkrs left OPEN at power
Pump min recirc valves (EF-V-8s)
Blocked what?
Blocked OPEN (not seismically qualified)
Reactor River B/U supply valves (EF-V-4/5)
1C ESV MCC
Block loading
Block 1 topic and loads (5 things)
Injection
HPI pumps
LPI pumps
Valves for core cooling
Rx river valves
TRIP RB Cooling Fans
Block loading
Block 2 topic and loads (2)
Cooling
RB cooling fans (AH-E-1A/B/C) restart in slow
Rx river pumps
Block loading
Block 3 topic and loads (4)
Closed Cooling
NR
NS
DR
DC pumps
Block loading
Block 4 topic and loadings (3)
Spray
BS-P-1A/B start permissive
AH-E-15A/B
AH-E-27A/B
Block Loading
Block 5 topic and loading (2)
EFW
EF-P-2A/B Start
EF-V-30s align to HSPS demand
Steam binding of EF-P-1
High temps on pump suction or discharge > what pressure, discharge pressure < OTSG pressure, and pump speed > what RPM
> 200F
3500 RPM (spinning but no flow)
Block Loading/EF-P-2
Actuation T=
Pump Start T=
Full Flow T=
Actuation (t=0) HSPS received
Start (T=5 sec) EF-P-2A/B start
Full Flow (t=15 sec) full pump Flow achieved
EF-P-1 Sequence
How much time to EF-P-1 Full flow following HSPS actuation
40 seconds
Scenario
HSPS ONLY
5 second TD + 10 seconds for full flow = 15 seconds
Scenario
LOOP
10s EGY + 15s above = 25 seconds
Scenario
ESAS
15s block 4 start permissive + normal 15s = 30 seconds
