4506 Flashcards by Brandy Wark

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

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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.

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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

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Where does the AGA sample from? And, what is it monitoring for?

Samples GDTs and CVCS HUTs for high oxygen and Hydrogen

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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

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What are the NESW Pump Power supplies?

11B (21B)

11C (21C)

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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

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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

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What will cause RRV-306 to close?

High Rad signal on 1505/1525 or 2505 / 2525

No Unit 1 AX Fans running

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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

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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

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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.

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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

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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

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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)

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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

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What happens with CTS and Load Shed (Load Con)

Trips the train specific NESW Pump to prevent EDG Overload

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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

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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

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What is the purpose of the LD Pressure Control valve QRV-301?

Maintains DP across orifice to prevent flashing.

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At what temperature does QRV-302 bypass flow around the Demins?

143 degrees

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What is the minimum VCT pressure at power operations and why?

15 psig during RCP Ops for RCP Seal #2 flow (back pressure)

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What is the maximum VCT pressure at power operations and why?

37 psig to ensure adequate Emergency Boration Flow

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Explain how the CCP Recirc Valves work on a SI.

Close on SI. 2 second delay, then maintain 1812 - 1825#

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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?

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?

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)