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Systems 11-13-19 > CVCS (Chemical Volume Control System) > Flashcards

CVCS (Chemical Volume Control System) Flashcards

1
Q

VCT Volume (e.g. % per gal)

A

41.26 gal/%

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2
Q

VCT level is 45%
RWT to charging pump suction valve (CHN-UV-536) is open
VCT outlet valve (CHN-UV-501) is closed
Which of the following describes the interlock between CHN-UV-536 and CHN-UV-501?

A. UV-501 will automatically open following a manual closure of UV-536.
B. UV-536 auto opens on a loss of power to UV-501.
C. UV-536 will auto open whenever UV-501 is closed.
D. UV-536 will auto open whenever UV-501 is opened.

A

A. UV-501 will automatically open following a manual closure of UV-536.

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3
Q

Which one of the following describes the sequence of events when a low level of 5% occurs in the volume control tank?

A. Letdown is automatically diverted from the volume control tank to the pre-holdup ion exchanger.
B. Charging pump suction will come from a boric acid makeup pump that will automatically start.
C. Charging pump suction will come from a reactor makeup water pump that will automatically start.
D. Holdup pumps will secure if the holdup pump to the reactor drain filter valve (CHN-V686) is open.

A

B. Charging pump suction will come from the boric acid makeup pump that will automatically start.

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4
Q

Which one of the following will cause an auto open of the RWT to Charging Pump Suction Valve CHE-UV-536?

A. A low-low (5%) VCT level Only.
B. A loss of power to UV-514 Only.
C. A low-low (5%) VCT level and a loss of power to UV-514.
D. UV-501 is taken to close position with UV-514 closed.

A

C. Low-Low (5%) VCT level and loss of power to UV-514.

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5
Q

Unit is at rated power.
Seal Injection is isolated to the RCPs due to a leak in the Aux Building.
Which of the following describes the effect (if any), that this has on the RCP Temps?

A. Isolating Seal Injection should have NO impact on the seal temperatures.
B. HP Seal Cooler inlet temperature will rise to between 200F and 220F, all other seal temperatures should increase by about 70F.
C. HP Seal Cooler inlet temperature should remain relatively constant, while all other seal temperatures should increase by about 70F.
D. HP Seal Cooler inlet temperature will rise to between 200F and 220F while all other seal temperatures remain normal.

A

D. HP Seal Coil inlet temperature will rise to between 200F and 220F while all other seal temperatures remain normal.

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6
Q

Unit is at 100% power.
NC surge tank level is rising.
RU-6 process monitor is in alarm.
What would be indicative of a RCS leak in the letdown heat exchanger?

A. Back pressure control valve closing.
B. Back pressure control valve opening.
C. Indicated letdown flow increasing.
D. NC flow from the heat exchanger decreases.

A

A. Back pressure control valve closing.

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7
Q

Unit is operating at 100% power.
The chemical and volume control system is in its normal lineup.
Which one of the following would occur if letdown heat exchanger outlet temperature exceeds 135F?

A. Seal injection flow would decrease.
B. Letdown flow would isolate.
C. Volume control tank level would increase.
D. Charging flow would increase for additional cooling.

A

B. Letdown flow would isolate.

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8
Q

Plant conditions require IMMEDIATE boration.
RCS pressure is 2230 psia.
RWT level is 65%.
Which ONE of the following methods is available for immediate boration?
Align Charging pump…

A. Suction to the RWT through CHE-UV-536.
B. Suction to the RWT through CHN-UV-514, ensuring a BAMP pump is operating.
C. Suction to the RWT through CHN-UV-514, ensuring the Boric Acid Makeup filter is bypassed.
D. Alternate suction through CHB-V327.

A

D. Alternate suction through CHB-V327.

Valve is in East Mech Pen. Down the ladder

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9
Q

Plant conditions are such that shutdown margin is less than required. Regarding the use of gravity feed from the Safety Injection System through CH-V327 to the charging pumps, which one of the statements is correct?

A. When the RWT Lvl reaches 40%, a CHG pump low suct trip will occur.
B. The RWT Lvl must be above 73% if this flow path is used to ensure CHG pump suction.
C. Manual valve operations must be performed outside the control room.
D. In order to satisfy TS req., the boration flow rate must be 50 gpm.

A

C. Manual valve operations must be performed outside the control room.

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10
Q

An emergency boration is required and the path through CHN-UV-514 has been chosen. If the BAMPs are not available, which additional valve must be opened to ensure adequate NPSH exists for the charging pumps?

A. CHN-V164
B. CHN-V144
C. CHN-UV536
D. CHN-UV514

A

A. CHN-V164

Location is 120’ behind block wall

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11
Q

When using the Spent Fuel Pool (SFP) as a source for emergency boration, why must CHN-HV-532 be closed?

A. The SFP boron concentration is higher than RWT.
B. PC Clean-up must be isolated if the valve is left open.
C. A gravity flow path would be established between the SFP and RWT.
D. Three charging pumps cannot run on the SFP with the valve open.

A

C. A gravity flow path would be established between the SFP and RWT.

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12
Q

CHN-UV-510 will close when CHN-FIC-210Y indicates flow of….

A. 3 GPM
B. 2 GPM
C. 20 GPM
D. 10 GPM

A

C. 20 gpm.

CHN-UV-510 (re-circ for BAMPs to RWT).

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13
Q

Unit is at 100% power.
Dilution to the RCS is in progress to raise temperature.
CHN-FIC-210X is in auto with an output of 50%.
The unit experiences a loss of NNN-D11.
After NNN-D11 has power restored, CHN-FIC-210X will be in….

A. Manual with 0% output.
B. Auto with 0% output.
C. Auto with 50% output.
D. Manual with 50% output.

A

A. Manual with 0% output.

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14
Q

The VCT outlet valve (CHN-UV-501) can be operated from the Control Room…

A. ONLY
B. And locally at PHA-M35
C. And the Remote Shutdown Panel
D. And locally at NHN-M72

A

D. And locally at NHN-M72

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15
Q

Unit is at 100% power in a normal lineup.
The MCC that supplies power to CHN-UV-514 is de-energized.
If a lo-lo level in the VCT now occurs, what is the status of the following valves?
CHN-UV-501, CHE-HV-536, CHN-UV-514

A. Open, Open, Closed
B. Closed, Open, Closed
C. Open, Closed, Closed
D. Closed, Closed, Open

A

B. Closed, Open, Closed

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16
Q

The Refueling Water Tank is designed to provide full flow of all Engineered Safety Feature pumps for at least ______ (plus 10% margin) prior to reaching a low level switchover to the sump for recirculation.

A. 10 minutes
B. 20 minutes
C. 30 minutes
D. 1 hour

A

B. 20 min.

Note: RWT is 7500 gal/%

17
Q

Unit is at 100% power with letdown in service.
A large break loss of cooling accident occurs resulting in a reactor trip.
Pressurizer pressure is 1750 psia and lowering.
What is the status of the following valves?
CHB-UV-515, CHA-UV-516, CHB-UV-523

A. Open, Open, Open
B. Closed, Closed, Open
C. Open, Closed, Closed
D. Closed, Closed, Closed

A

D. Closed, Closed, Closed

Note: SIAS occurs at <1837 giving a CIAS

18
Q

What following ESFAS actuations could result in RCP Controlled Bleed Off being directed to the Reactor Drain Tank?

A. Containment Spray Actuation Signal
B. Containment Isolation Actuation Signal
C. Safety Injection Isolation Signal
D. Recirculating Actuation Signal

A

A. Containment Spray Actuation Signal.

19
Q

What is the CHG pump requirement for TLCO 3.1.103 and requirement for Modes 1-4?

A. At least one charging pump shall be OPERABLE
B. At least two charging pumps shall be OPERABLE
C. At least one charging pump and one high pressure safety injection pump shall be available
D. At least two charging pumps shall be available

A

B. At least two charging pumps shall be OPERABLE.

20
Q

Which of the following will NOT result in a BLUE light on Boric Acid Make-up Pump hand switch CHN-HS-207?

A. RWT level Lo-Lo
B. Loss of control power
C. Low discharge pressure trip
D. Low suction pressure trip

A

D. Low suction pressure trip

21
Q

CHN-HS-4 Charging pump mode selector switch is in 1-2-3 position.
A fault occurs on ESF Transformer NBN-X03
After 1 minute what is the status of the charging pumps?

A. All charging pumps are stopped and in an anti pump condition
B. A and B charging pumps are running, E is stopped
C. A charging pump is stopped in an anti pump condition, B charging pump is running
D. All charging pumps are running

A

C. A charging pump is stopped in an anti pump condition, B charging pump is running.

(Note: LOP means that a loss of power to a PB bus. Since the normal power was not lost the A is in an anti pump condition due to a locked in start signal. The B pump is running because it never lost power)

22
Q

Which one of the following failures would result in a loss of letdown with no operator action?

A. Thot input to reactor reg fails high, Tavg selected to average.
B. Selected PZR pressure input to PPCS fails high.
C. Tcold input to reactor reg fails high, Tavg selected to average.
D. Selected PZR pressure input to PPCS fails low.

A

B. Selected PZR pressure input to PPCS fails high.

Note: Spray Valves open causing pressurizer pressure to lower giving a SIAS (1837 psia).

23
Q

An event has occurred that requires emergency boration.
The crew has established boration through CHN-UV-514 (Boric Acid Makeup to Charging Pumps) with boric acid makeup pump running.
Subsequently
NHN-M1528 (Power to CHN-UV-514) trips open.
CHN-LT-227 (VCT level transmitter) fails LOW.
CHN-LI-226 (VCT Level) reads 48%.
Which ONE of the following describes the impact of these conditions on the emergency boration flow path?

A. The crew must manually open CHE-UV-514 to establish an emergency boration flow path.
B. The crew must manually open CHE-HV-536 to establish an emergency boration flow path.
C. The emergency boration flow path will be maintained through a single suction flow path (via CHN-UV-514) to the charging pumps.
D. The emergency boration flow path will be maintained through two suction flow paths (via CHN-UV-514 and CHN-HV-536) to the charging pumps.

A

D. The emergency boration flow path will be maintained through two suction flow paths (via CHN-UV-514 and CHN-HV-536) to the charging pumps.

24
Q

Unit 1 is at 100% power.
Alarm VCT TRBL (3A09A) actuates.
The RO notes the VCT pressure is 5 psig and lowering slowly.
Which ONE of the following identifies (1) the required action (2) the reason for the action?

A. (1) raise Hydrogen pressure (2) to prevent water from flashing inside the VCT
B. (1) raise Hydrogen pressure (2) to maintain charging pump NPSH
C. (1) raise Nitrogen pressure (2) to prevent water from flashing inside the VCT
D. (1) raise Nitrogen pressure (2) to maintain charging pump NPSH

A

B. (1) raise Hydrogen pressure (2) to maintain charging pump NPSH

25
Q

Unit 1 operating at 100% power.
The #3 seal on Reactor Coolant Pump 1A has degraded.
The crew has verified a 17 gpm leak rate per 40AO-9ZZ02 (Excessive RCS Leak Rate)
Reactor Drain Tank (RDT) pressure is 5 psig and increasing.
RDT level is 56% and increasing.
Volume Control Tank (VCT) level is 41% and lowering.
Pressurizer level is stable.
Which ONE of the following identifies (1) the result if NO operator action(s) are taken and (2) the required action to take to maintain parameters within limits?

A. (1) the RDT rupture disk will blow (2) vent the RDT to Containment
B. (1) the RDT rupture disk will blow (2) vent the RDT to the gas surge header
C. (1) charging pump suction will be lost (2) take manual control of makeup to the VCT
D. (1) charging pump suction will be lost (2) align the Reactor Water Tank to the charging pump suction

A

B. (1) the RDT rupture disk will blow (2) vent the RDT to the gas surge header

26
Q

What are the power supplies to the Charging Pumps?

  1. Charging Pump #1, CHA-P01
  2. Charging Pump #2, CHB-P01
  3. Charging Pump #3, CHE-P01

A. (1) PGA-L31 (2) PGA-L32 (3) PGA-L33 or PGB-L34
B. (1) PGA-L31 (2) PGA-L32 (3) PGA-L35 or PGB-L36
C. (1) PHA-M31 (2) PHB-M32 (3) PHA-M33 or PHB-M34
D. (1) PHA-M31 (2) PHB-M32 (3) PHA-M35 or PHB-M36

A

B. (1) PGA-L31 (2) PGA-L32 (3) PGA-L35 or PGB-L36

27
Q

Which of the following combination of valves failing OPEN would cause a loss of Containment Integrity per Technical Specifications?
CHB-UV-515 (LTDN to REGEN HX ISOL VLV UV-515)
CHA-UV-516 (LTDN to REGEN HX ISOL VLV UV-516)
CHB-UV-523 (REGEN HX OUTLET ISOLATION VLV UV-523)
CHA-HV-524 (CHG PUMPS DSCH HDR to REGEN HX VLV HV-524)

A. CHB-UV-515 and CHB-UV-523
B. CHB-UV-515 and CHA-HV-524
C. CHA-UV-516 and CHB-UV-523
D. CHA-UV-516 and CHA-HV-524

A

C. CHA-UV-516 and CHB-UV-523

28
Q

Unit 3 is operating at 100% power.
All RCP seal injection controllers (CHN-FIC-241 to 244) are in automatic.
The output SIGNAL of CHN-FIC-241 (1A RCP Controller) is rising.
Disregard the response of the remaining Seal Injection Controllers.
Which ONE of the following describes the cause?

A. NNN-D11 is de-energized.
B. Inadvertent CSAS actuation.
C. Actual Seal Injection flow is below set point.
D. Regenerative Heat Exchanger outlet temperature has exceeded 413F.

A

B. Inadvertent CSAS actuation.

(Note: CSAS actuation will isolate IA to the Containment and valves will slowly open, therefore controller will try to lower flow by raising output. These controllers are reverse acting)

29
Q

Unit 2 is at 100% Power.
PSV-203 (PZR Safety Valve) has seat leakage.
Reactor Drain Tank (RDT) Level is rising.
RDT pressure is 7.5 psig and rising slowly.
Window 3A07A (Reac DRN Loop TRBL) is alarming.
Window 3A07B (Reac DRN TK Press HI) is alarming.
Which one of the following conditions is correct?
The alarm Response procedure (40AL-9RK3A) directs the crew to vent the RDT to…

A. Containment before it isolates at 10 psig.
B. Containment before it ruptures at 10 psig.
C. The gas surge header before it isolates at 10 psig.
D. The gas surge header before it ruptures at 10 psig.

A

C. The gas surge header before it isolates at 10 psig.

30
Q

Unit 1 is operating at 100% power.
CHN-UV-240, Charging Line to RC Loop 2A valve, has failed closed.
Which one of the following would be the effect on the Chemical and Volume Control system?

A. Auxiliary Spray flow is not available
B. Seal Injection flow to the RCPs is lost.
C. Regen HX outlet valve CHB-UV-515 will close on high temperature, isolating Letdown flow.
D. Differential pressure between charging and the RCS increases, charging flow to the loop is unchanged.

A

D. Differential pressure between Charging I and the RCS increases, charging flow to the loop is unchanged.

31
Q

Unit 1 is operating at 100% power.
RCS pressure is being maintained at 2230 psia.
The pressurizer is in Boron Equalization.
Subsequently
RCS pressure is slowly increasing.
Letdown flow goes to 0 gpm.
Main Spray valves RCN-PV-100E/F indicate closed.
CHB-UV-515, Letdown to Regen HX isolation valve, indicates closed.
CHA-UV-516, Letdown to Regen HX isolation valve, indicates closed.
Which one of the following is correct for these indications?

A. CIAS has actuated. Verify containment parameters.
B. Nuclear Cooling Water flow has been lost. Cross-tie Essential Cooling Water.
C. Instrument air leak in Containment. Close IAA-UV-2, Instrument Air Outside Containment Isolation.
D. NNN-D11 (Non-class instrument power) has de-energized. Align the instrument bus to it’s alternate supply.

A

C. Instrument air leak in Containment. Close IAA-UV-2, Instrument Air Outside Containment Isolation.

32
Q

A high alarm on RU-155D, RCS Letdown monitor, is indicative of…

A. RCS fuel cladding failure.
B. High activity levels in the Purifiction IX area.
C. RCS leakage into the Nuclear Cooling Water system.
D. High at giving levels in the Letdown heat exchanger area.

A

A. RCS fuel cladding failure.

33
Q

Unit 1 is operating at 100% power.
A 22 gpm leak rate has been verified.
Pressurizer level is 52% and stable.
Charging pumps A and B are running.
Letdown flow is 50 gpm.
The leak is at the discharge of the Charging pumps.
In accordance with 40AO-9ZZ02, Excessive RCS leak rate, the CRS has directed that all charging pumps be stopped.
Which one of the following actions or requirements must be performed?

A. An immediate Reactor trip is required.
B. Ensure letdown is isolated in order to prevent purification IX resin damage.
C. Seal injection must be restored within 10 minutes or the Reactor Coolant pumps must be secured.
D. Comply with actions of LCO 3.4.14, RCS Operational Leakage due to ‘Identified Leakage’ being in excess of 10 gpm.

A

B. Ensure letdown is isolated in order to prevent purification IX resin damage.

34
Q

Unit 1 is at 100% power in a normal lineup.
All RCP seal injection controllers (CHN-FIC-241-244) are in automatic.
2 charging pumps are in operation.
Which one of the following would cause the output signal of CHN-FIC-244, 2B RCP controller, to lower?

A. A charging pump trips
B. An inadvertent CIAS has occurred
C. A different RCPs seal injection control valve has failed closed.
D. A loss of instrument air to the CHN-FIC-244, 2B RCP controller.

A

A. A charging pump trips

35
Q

Unit 1 is at 30% power while shutting down in preparations for a refueling outage.
Reactor Coolant Pump 1A has tripped.
The reactor did not automatically trip.
All attempts to trip the reactor from the Control Room have failed.
Assuming NO other operator actions, initiating an 80 gpm boration would add…

A. Positive reactivity to the core and cause RCS temperature to increase.
B. Positive reactivity to the core and cause RCS temperature to decrease.
C. Negative reactivity to the core and cause RCS temperature to increase.
D. Negative reactivity to the core and cause RCS temperature to decrease.

A

D. Negative reactivity to the core and cause RCS temperature to decrease.

36
Q 
Initial Conditions:
Unit 1 is operating at 100%.
CEDMCS is in Automatic.
A New Purification Letdown Ion Exchanger was just placed in service at the end of last shift.
Subsequently:
Tavg is 591F and rising slowly.
A Low Rate CEA insertion demand exists.
CEAs begin inserting.
Which ONE of the following would cause this condition and what procedure will be used to respond?

A. RWT to CVCS gravity feed isolation (CHE-HV-536) is leaking by, manually ISOLATE per 40OP-9CH02 (Purification System)
B. New letdown IX not appropriately borated prior to placing in service, manually ISOLATE per 40OP9CH02 (Purification System)
C. New letdown IX not appropriately borated prior to placing in service, BORATE the RCS per 40OP-9CH01 (CVCS Normal Operations)
D. RWT to CVCS gravity feed isolation (CHE-HV-536) is leaking by, BORATE the RCS per 40OP-9CH01 (CVCS Normal Operations)

A

C. New letdown IX not appropriately borated prior to placing in service, BORATE the RCS per 40OP-9CH01 (CVCS Normal Operations)

(Note: An IX that has not been appropriately borated will result in the RCS temperature rise and the CEA insertion. 40OP-9CH01 is the procedure that directs berating the RCS maintain Tc on program.)

37
Q

Unit 1 is operating at 100% power.
VCT Level is 40% and stable.
The RO reports the VCT Pressure is 3 psig and lowering.
Which ONE of the following describes the impact of this condition on the CVCS system and what action will mitigate the event?
Primary Coolant (RCS) will have…

A. Increased Hydrogen concentrations, ISOLATE the VCT from gaseous radwaste per 40AO-9RK3A (B03 ARP)
B. Increased Oxygen concentrations, ISOLATE the VCT from gaseous radwaste per 40AO-9RK3A (B03 ARP)
C. Increased Hydrogen concentrations, VENT the VCT to gaseous radwaste per 40OP-9CH01 (CVCS Normal Operations)
D. Increased Oxygen concentrations, VENT the VCT to gaseous radwaste per 40OP-9CH01 (CVCS Normal Operations).

A

B. Increased Hydrogen concentrations, VENT the VCT to gaseous radwaste per 40OP-9CH01 (CVCS Normal Operations)

(Note: With the lower VCT pressure the H2 will come out the solution which will eventually lead to higher than desired O2 concentrations. VCT TRBL alarm actuates 5 psig, the ARP directs isolating the VCT from the gaseous radwaste system.)

38
Q

Unit 1 is operating at 50% power.
Letdown flow s 65 gpm and lowering.
Charging pumps CHA-P01 and CHE-P01 are running.
Charging pump CHB-P01 is available.
RCS temperature is stable.
PZR level is 40% and lowering at 0.5% per minute.
1. The leak rate IS WITHIN/EXCEEDS the capacity of all three charging pumps with letdown isolated.
2. Per 40AO-9ZZ02, Excessive RCS leak rate the following actions should be taken….

A. 1. EXCEEDS
2. Isolate letdown, then start an additional charging pump and trip the reactor.
B. 1. EXCEEDS
2. Start an additional charging pump, then isolate letdown and trip the reactor.
C. 1. IS WITHIN
2. Isolate letdown, if level continues to lower then start an additional charging pump.
D. 1. IS WITHIN
2. Start an additional charging pump, if level continues to lower then isolate letdown.

A

D. 1. IS WITHIN

2. Start an additional charging pump, if level continues to lower then isolate letdown.

Systems 11-13-19 (41 decks)

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