4506 Flashcards
What causes 12-RRV-285, radioactive liquid waste disposal effluent hdr to Circ Water Discharge Tunnel Shutoff Valve, to close?
Loss of Air
High radiation from RRS-1000 or failure
What are the interlocks on 2-RRV-286 and 1-RRV-287, Liquid waste to Circ Water Disch Tunnel Shutoff valve?
Won’t open unless at least one Circ Water Pump is in operation from their respective unit. Will trip closed if loss of all CW Pumps in that unit.
Where does the AOM take samples from? And what happens on a high O2 alarm?
Samples discharge of WGC Moisture Separator.
On high oxygen, swaps to standby GDT
Where does the AGA sample from? And, what is it monitoring for?
Samples GDTs and CVCS HUTs for high oxygen and Hydrogen
What are the miscellaneous header loads for the NESW system?
Glycol Chiller Condensers**
Ice Bin Cooling Loop Condensers
TRS Neutralization reign header
Fluidized Chiller Condenser and Air Precooler
Chem Cleaning Mixing Station
MUP Retention Tank and Degassifier Vac Pump
What are the NESW Pump Power supplies?
11B (21B)
11C (21C)
What are the auto starts of the NESW Pumps, including what the switch position may be?
Loadshed - Neutral and Auto
SI - Neutral and Auto
Low Pressure off 55 (60) pasig - Auto Only
What does 12-RRV-305, waste gas to aux building vents pressure reg valve do and why?
Maintains constant pressure on RRV-306 (set to 5 psig) so we have a known flow rate to determine our release
What will cause RRV-306 to close?
High Rad signal on 1505/1525 or 2505 / 2525
No Unit 1 AX Fans running
What ventilation is required for RRV-306 to be open?
Either unit 1 aux exhaust fan must be running (will cause trip)
Cross-tie damper will be closed when releasing
What could be the cause of an automatic swap to the standby GDT?
I/S tank reaches 100 psig
Hi Hi Oxygen from the AOM
***Standby tank must be selected
How do we ensure a continuous path to at least one waste HUT?
CWHUT and DWHUT valves are interlocked to make sure BOTH valves cannot be closed at the same time.
What are the Unit 1 Reactor Trips associated with Low Steam Generator Levels?
Low Low Level at 5% 2/3 on 1/4 SGs
Low Level at 15% 1/2 on 1/4 SGs with FF < SF at 0.71E6 lb/hr 1/2 on same SG
What are the U2 Reactor Trips associated with Steam Generator Level?
Low Low Level at 22% 2/3 on 1/4 SGs
Low Level at 26% 1/2 on 1/4 SGs with FF < SF at 1.47E6 lb/hr 1/2 on same SG
What are the NESW Pump Suction sources, listed in the preferred order?
Circ Water Suction (same unit, then opp unit)
Discharge Tunnels (same unit, then opp unit)
What happens to the NESW system on a loadshed when there is a SI Signal but no CTS Signal? (Load Cons)
The Loadshed Maximizes flow to CAC and CLVs
LO Cooler WMOs close
CUVs, CIRs, and MACs close, NOT CLVs
Unit Xtie to Misc HDR closes
What happens with CTS and Load Shed (Load Con)
Trips the train specific NESW Pump to prevent EDG Overload
What are the interlocks for letdown isolation valves QRV-111/112?
Close on PRZ Level at 17%
Will NOT open if any orifice isolation valve is open
Fail Close
What are the interlocks on the Letdown Orifices?
Close when either LD Isolation is closed
Close on Loss of both CCPs
Close at PRZ Level of 17%
Close on Phase A
Fail closed
What is the purpose of the LD Pressure Control valve QRV-301?
Maintains DP across orifice to prevent flashing.
At what temperature does QRV-302 bypass flow around the Demins?
143 degrees
What is the minimum VCT pressure at power operations and why?
15 psig during RCP Ops for RCP Seal #2 flow (back pressure)
What is the maximum VCT pressure at power operations and why?
37 psig to ensure adequate Emergency Boration Flow
Explain how the CCP Recirc Valves work on a SI.
Close on SI. 2 second delay, then maintain 1812 - 1825#
What is the minimum flowrate in auto for QRV-251, CCP Flow Control valve?
40 GPM
What closes the Charging Header Isolation Valves, QMO-200 and 201?
SI
Where does the CVCS take suction from?
Loop 4 CL
Where does charging discharge into the RCS?
Loops 1 and 4 cold legs
Where does the Seal Return Safety Valve, SV-50 discharge to? And why is it important?
Goes to PRT and provides RCP #1 SLO path in event a Phase A happens.
Where is a very liked leak if you have CCW going into the RCS?
Seal Water Heat Exchanger, due to the lower pressure!
Where does RHR Tap into Letdown?
Between containment and upstream of letdown Hx
Where does the VCT Safety go?
CVCS HUTs
Does QFI-200 (charging flow) include seal injection flow?
Yes! It is TOTAL CHARGING
What auto diverts QRV-303, VCT Divert Valve?
High Level in VCT
What auto starts the CCPs?
SI
What happens to the CVCS system on a SI?
Both Charging Pumps Start
Close charging header iso valves
Close CCW to LD Hx
Close CCP Recircs
Realign CCP Suction to RWST
Open BIT valves
What happens to the CVCS System on a Phase A?
Close LD Orifice Valves
Close Seal Return Valves
Close LD CIVs
Close CCW to XS LD Hx
What are the alarms and actions associated with QLC-451?
87% Divert to trip open and alarm
24% Auto Makeup Stops
14% Auto Makeup Starts + Low Alarm + MU not in auto alarm
2.5% VCT Low Low alarm + RWS
What happens with QLC-452 for VCT Level?
87% Divert fails open
78% Divert Starts to modulate
7% Low alarm
2.5% VCT Low Low + RWS
What happens if QLC-451 fails High?
High alarm and QRV-303 trips to full divert
What happens if QLC-451 fails low?
Start Auto Makeup
Several alarms
1/2 RWS
What happens if QLC-452 fails high?
QRV-303 modulates to divert
What happens if QLC-452 fails low?
2 alarms
RWS 1/2
What are the inputs to the Subcooling calc?
5 highest CETs
Auctioneered Low WR RVLIS Level (this is selectable)
What is key about 757 degrees for core temp?
Indicates that core exit is superheated
When would you exit FRC1 to the SAMG?
With CETCs > 1200 degrees AFTER starting all RCPs one at a time
When would you not attempt to restart RCPs in FRC1? Why?
If SG depressurization was ineffective, due to loss of heat sink bc creep failure may happen in SG Tubes
What conditions must be satisfied to exit FRC1?
RVLIS NR above 46% or Any of the 5 highest CETCs < 757 degrees.
If only one… go to FRC2
Why do we stop SG depressurization at 160 psig SG Pressure and 150 RCS pressure during FRC1?
To keep nitrogen out of the RCS
What happens when an AES fan switch is placed to stop?
Affected fan’s dampers swap to charcoal filter mode. NO flow going through it.
What happens when the supply breaker is opened to an AES Fan?
The opposite train fan goes into charcoal filter. No indicating lights. But must be logged.
How does a Phase B affect the AES Fans?
BOTH fans go to charcoal filter mode, but the light only lights for the train with the active phase B
What trips the AFS Fans?
Load Con
High rad from SFP Monitor
Overload
What trips the AFX Fans?
Load Con
Charcoal Bed Fire
Overload
What causes the AFX Charcoal Filter Mode to activate?
Hi Rad from SFP Monitor
Loss of Power to either AFX Fan
Loss of Air
How are dampers positioned on the CPR during a cable vault fire?
Normal Intake closes
Alternate outside air intake opens
Recirc Damper Closes
How do the dampers for the CPR for a high radiation alarm?
Normal intake closes
Alternate outside air goes part open
Recirc Damper Opens
How do the dampers for the CPR reposition on either unit SI?
Normal intake closes
Alternate intake opens part way
Recirc Damper remains open
What is the desired alignment for CPR dampers if there is a toxic gas present?
All dampers should be closed manually. Normal and Alt outside air, as well as Recirc damper.
What are the auto starts for the MDAFP?
Both MFPs Trip (if switch is in auto) AMSAC Loadshed Low Low SG Level in 1 SG SI
What are the auto starts for the TDAFP?
Under voltage on the RCP Bus
Steam Generator Low Low in 2 SGs
AMSAC
What happens on a Flow Conservation signal for Aux Feedwater?
SG Blowdown Isolations Close
AFW Pump Test VLVES CLOSE
MDAFP FMOS OPEN
What are the preferred sources of water supply for AFW? In order.
Affected Units CST
Other Units CST via Cross Tie
Affected Units hotwell via CST
ESW
What happens on a Flow Retention?
Pump discharge valves throttle back
FLOW RETENTION OVERRIDES FLOW CONSERVATION
What is the CST TS Minimum and what is the basis?
182,000 gallons
To maintain plant in hot standby for 9 hours on the PORVs w LOOP
Or
To hold un it in Mode 3 for 2 hours followed by a 4 hour cool down on RHR at 50 degrees per hour
What does the AMSAC Signal do?
Trips the turbine and starts all AFW Pump
How is AMSAC enabled?
C-20
Turbine 1st Stage > 40% (2 / 2)
What will actuate AMSAC?
Feed Flow <25% on 3/4 SGs. 1 channel from each SG feeds into this (1, 2, 1, 2)
