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Systems 11-13-19 > PZR > Flashcards

PZR Flashcards

1
Q

What is PZR Control Level Program

A

0-15% PWR - 33% lvl

15-100% PWR - linear to 52.5%

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2
Q

PZR Heater Interlocks

A

PZR Heaters Off

<25% Level or
>2285 psia
SIAS (class only)

(Note: Reset @27%)

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3
Q

What is the PZR heater Setpoint Override?

A

Initiated by taking the heater bank control switch (HS-100-4, 5, 6, 7, 8, 9) firstly to OFF then to ON.

  • A white OVERRIDE light illuminates to indicate this mode.
  • After a 10 second time delay, the override can be canceled by taking the control switch to OFF.
  • 10 seconds must then elapse before the override can be re-initiated.
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4
Q

What is the purpose of the SIAS Override?

A

Class 1E powered backup heater banks trip on SIAS

SIAS Override allows these heater banks to be reenergized with a SIAS present.

  • Initiated in the same manner as the Normal Setpoint Override.
  • Once initiated, the heater banks can be de-energized and re-energized as desired.
  • This override permissive remains in effect until the SIAS signal is reset.
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5
Q

CHG pump Level Deviation Program

A

(+15% and increasing) Normally Running Pump - Stops
(+14% and decreasing) Normally Running Pump - Restarts

(-14% and increasing) Standby Pump - Stops
(-23% and decreasing) Standby Pump - Starts

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6
Q

PZR Heater Level Deviation Program

A

(+3% and increasing) Hi Level Dev. Backup Heaters - ON (Anticipated in-surge)
(+2.5% and decreasing) Hi Level Dev. Resets Back up Heaters - OFF

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7
Q

Unit is operating at 50% power.
Letdown begins reducing rapidly.
The operator selected the alternate PZR level channel but the trend continues.
Which one of the following could be the cause?

A. Thot input to RRS has failed high.
B. Tc input to RRS has failed low.
C. Pressurizer pressure instrument has failed high.
D. Pressurizer pressure instrument has failed low.

A

A. Thot input to RRS has failed high.

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8
Q

Unit is operating at rated power.
The Pressurizer Master Controller is in REMOTE and MANUAL.
Pressurizer level is being maintained at approximately 52%.
The Pressurizer Level Control selector switch is in the ‘X’ position.
RRS is aligned to monitor the average Tavg.
RCN-TT-111X (Thot) input into the RRS fails low.
Which one of the following (if any) describes an expected response?

A. This failure will have no impact.
B. All backup heaters energize.
C. The standby charging pump starts.
D. The letdown control valve throttles closed.

A

B. All backup heaters energize.

(Note: The REMOTE portion of this question is useless. It is in MANUAL Control).

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9
Q

The unit is operating at 100% power.
The normally running Charging Pump stops.
Letdown flow increases to maximum then isolates.
Which one of the following instrument failures (if selected) could be the cause of these conditions?

A. Pressurizer level controller loses power.
B. Tc input to reactor regulating system fails low.
C. Pressurizer level transmitter output fails low.
D. Tc input to reactor regulating system fails high.

A

B. Tc input to reactor regulating system fails low.

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10
Q

Unit is at 35% power.
Pressurizer Level Control System Master Controller (RCN-LIC-110) Remote Auto.
‘Pressurizer Trouble’ Alarm.
Letdown flow starts to lower.
RCN-LIC-110 shows PZR level set point at 53%.
All other system responses are normal.
Which of the following is the probable cause of the failure?

A. NNN-D11 has lost power.
B. T-Cold input to RRS has failed low.
C. T-Cold input to RRS has failed High.
D. Letdown control valve is failing closed due to loss of power.

A

C. T-Cold input to RRS has Failed High.

Note: Program level at 35% power is 37.6% power. Full power level is 52.5%.

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11
Q

Unit is operating at rated power.
Pressurizer level set point controller (RCN-LIC-110) is in LOCAL-AUTO set at 52%.
Pressurizer level control selector channel X/Y switch is selected to Channel Y.
Pressurizer heater control trip channel X/Y switch in BOTH.
LT-110Y Fails low.
Assuming NO operator action, you should expect CHANNEL X indicated level to…

A. Increase and pressurizer heaters to energize.
B. Decrease and pressurizer heaters to energize.
C. Decrease and pressurizer heaters to de-energize.
D. Increase and pressurizer heaters to de-energize.

A

D. Increase and pressurizer heaters to de-energize.

(Note: Selector in Local-Auto means that level is controlled per the black set point arrow.

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12
Q

The plant is at 100% power.
PZR level control selected to LT-110X.
A loss of NNN-D11 occurs.
Which of the follow describes the effect on the Pressurizer Level Control System?

A. PZR level control RCN-LT110X and RCN-LT110Y are lost.
B. The PZR level controller RCN-LIC-110 fails to zero.
C. The standby charging pump will start.
D. PZR level control channel RCN-LT-110X loses power.

A

B. The PZR level controller RCN-LIC-110 fails to zero.

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13
Q

Which one of the following describes the function(s) of high pressure interlock in the PPCS?

A. Causes a signal to be sent to the PPS to trip the reactor if pressure exceeds 2383 psia.
B. Energized all the backup heaters at 2285 psia but has no impact on proportional heaters.
C. De-energizes all the backup heaters at 2285 psia. Has no impact of proportional heater operations.
D. De-energizes all pressurizer heaters at 2285 psia.

A

D. De-energizes all pressurizer heaters at 2285 psia.

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14
Q

A SIAS has occurred. Which statement below best describes the effect of the SIAS on the pressurizer heaters?

A. The proportional heaters are not affected.
B. All backup heaters trip and they cannot be re-energized unless the SIAS override is initiated.
C. The class backup heaters trip and they cannot be re-energized unless the SIAS is reset.
D. The non-class backup heaters trip and cannot be re-energized unless taken to set point override.

A

A. The proportional heaters are not affected.

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15
Q

Unit is operating at 100% full power.
Pressurizer Pressure Control System in AUTO with the set-point at 2250 psia.
Pressurizer pressure is 2270 psia and rising.
Which of the following describes the next automatic action as pressurizer pressure continues to rise?

A. Reactor trip on High Pressurizer Pressure.
B. Reactor Trip on Core Protection Calculators auxiliary trip.
C. Pressurizer backup heaters de-energize.
D. Pressurizer spray valves will modulate open.

A

D. Pressurizer spray valves will modulate open.

Note:

  • Spray valves begin to open at 25 psi above set point. Spray valves are full open at 50 psi above setpoint.
  • Reactor Trip on High Pressurizer Pressure (2383 psia)
  • Pressurizer backup heaters de-energize (2285 psia)
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16
Q

Which one of the following identifies the response of equipment controlled by the PLCS if actual PZR level decrease 25% below set point? (Note: Assume 100% power and all systems in automatic.)

A. Letdown control valves throttle closed, standby charging pump starts.
B. Backup heaters energize, low level alarm.
C. Letdown control valves shut, low level alarm.
D. All heaters de-energize on low level cutout, standby charging pump starts.

A

A. Letdown control valves throttle closed, standby charging pump starts.

(Note: Low level cutout is <25%. SBY CHG Pump starts <23% and decreasing from set point.)

17
Q

Unit is operating at rated power.
The Pressurizer Level Master Controller is in ‘Remote’ and ‘Manual.’
The Pressurizer Level Control Selector Switch is in the ‘X’ position.
RRS is aligned to monitor the average Tavg.
Thot (RCN-TT-121X) input into RRS fails HIGH.
Which one of the following describes the expected response (if any) this failure has on PLCS.

A. The standby charging pump starts.
B. The letdown control valve throttles closed.
C. The normally running charging pump stops.
D. This failure will have no noticeable impact other than alarms.

A

D. This failure will have no noticeable impact other than alarms.

(Note: The controller is in MANUAL. If it was not in manual since power is already 100% program is 52.5% and full band is 56%. 5.5% gives you backup heaters and closes letdown control valves.)

18
Q

With the pressurizer pressure controller in automatic and set at a set point of 2250 psia, which of the following would be expected if system pressure lowered to 2240 psia?
Proportional heaters would be firing at…

A. Less than 50% but greater than 0.
B. Greater than 50% but less than 100%.
C. 50%.
D. 100%.

A

B. Greater than 50% but less than 100%.

(Note: At zero error, controller output is 16.5%.
- Proportional Heaters are 50% energized.
- Spray Valves are closed.
As pressure decreases below set point, proportional heater power increases.
- Proportional heaters are at a maximum when pressure is 25 psi below set point.)

19
Q

Unit is at 98% power.
Pressurizer Pressure Control System (PPCS) is in ‘Automatic,’ with a set point of 2252 psi.
RCN-HS-100-10 selected to BOTH
Pressurizer Spray Valves 100E and 100F indicate dual.
Assuming normal system response, RCN-PIC-100 (PPCS Master Controller) must be in which range:

A. 0% to 16.5% output.
B. 16.5% to 33% output.
C. 33% to 50% output.
D. 50% to 100% output.

A

C. 33% to 50% output.

Note: 33.5% spray valves closed and 50% spray valves full open.

20
Q

The unit is operating at 100% power.
The Pressurizer pressure transmitter for the controlling channel fails low.
Assuming no operator action, which of the following is the first automatic plant response that occurs to mitigate the transient?

A. High pressure reactor trip.
B. Spray valves open.
C. Backup heaters de-energize.
D. Low pressure reactor trip and SIAS.

A

A. High pressure reactor trip.

Note: High pressure reactor trip - 2383 psia.

21
Q 
Which one of the following conditions will reset the set point override on the non-class pressurizer backup heaters?
ASSUME the heaters have been in set point override for longer than 10 seconds.

A. Taking the hand switch on B04 to OFF.
B. Placing the hand switch on B04 to ON.
C. Pressurizer Spray valves leave their closed seat.
D. 10 minutes elapsed without hand switch manipulation.

A

A. Taking the hand switch on B04 to OFF.

22
Q

One reason to have constant spray (bypass) flow to the pressurizer is to:

A. Minimize operating torque on the spray valves.
B. Reduce the pressure transient when spray valve open.
C. Help circulate pressurizer water to maintain uniform pressurizer temperature.
D. Minimize thermal shock on piping and spray nozzles when spray valves open.

A

D. Minimize thermal shock on piping and spray nozzles when spray valves open.

23
Q

Which one of the following is the first pressure at which the reactor coolant system safety valves should be open?

A. 2350 psia
B. 2475 psia
C. 2525 psia
D. 2700 psia

A

B. 2475 psig

Note: Reactor Coolant System safety limit pressure - 2750 psia

24
Q

Tech Spec 3.4.9 addresses which of the following pressurizer parameters to ensure PZR operability?

A. Level and temperature.
B. Temperature and pressure.
C. Boron Concentration and pressure.
D. Level and heater capacity.

A

D. Level and heater capacity.

25
Q

Unit 1 is operating at 5% power during a plant startup.
The Pressurizer Level Master Controller is in REMOTE and AUTO.
The Pressurizer Level Control selector switch is in ‘X’.
RRS is aligned to monitor average Tave.
A Tc instrument (RCN-TT-111Y) fails HIGH.
Which one of the following describes the expected plant response?

A. Letdown flow will begin to decrease
B. This failure will have no impact
C. The standby charging pump starts
D. The normally running charging pump stops

A

A. Letdown flow will begin to decrease

26
Q

Which of the following type of radiation monitor provides a means of detecting leakage of radioactive fluid into normally non-radioactive system?

A. Area Radiation Monitors
B. Process Radiation Monitors
C. Effluent Radiation Monitors
D. Ventilation Radiation Monitors

A

B. Process Radiation Monitors

27
Q

Unit 1 is operating at 50% power.
The Pressurizer Level Master Controller is in REMOTE and AUTO.
The Pressurizer Level Control selector switch is in ‘X’.
The Heater Control Selector Level Trip switch is in ‘X’.
Reactor Regulating System Tave fails LOW.
Which one of the following describes the expected plant response?

A. Normally running charging pump stops
B. Letdown flow will rise
C. Letdown flow will decrease
D. This failure will have no effect

A

B. Letdown flow will rise

28
Q

Unit 1 is operating at 100% power
The Pressurizer Level Master Controller is in REMOTE and AUTO
The Pressurizer Level Control Selector switch is in ‘Y’
The Heater Control Selector Level Trip switch is in ‘X’
RRS Tave fails HIGH
Which one of the following describes the expected plant response?

A. Normally running charging pump stops
B. Letdown flow will rise
C. Letdown flow will decrease
D. This failure will have no effect

A

D. This failure will have no effect

29
Q

Unit is operating at 10% power
The Pressurizer Level Master Controller is in REMOTE and AUTO.
The Pressurizer Level Control Selector switch is in ‘X’
The Heater Control Selector Level Trip switch is in ‘X’
RRS Tave fails HIGH
Which one of the following describes the expected plant response?

A. Standby Charging Pump starts
B. Letdown flow will rise
C. Letdown flow will decrease
D. Normally running Charging Pump will stop

A

C. Letdown flow will decrease

30
Q

Which pressurizer heaters remain available from control room following a loss of NKN-D42?

A. ‘A’ Class backup heaters
B. ‘B’ Class backup heaters
C. Non-Class backup heaters
D. No heaters are available

A

D. No heaters are available

31
Q

Unit 1 is operating at 100% power
The Pressurizer Level Master Controller is in REMOTE and AUTO.
The Pressurizer Level Control selector switch is in the ‘X’
The Heater Control Selector Level Trip switch is in ‘Both’
RRS is aligned to monitor average Tave
RCA-LT-110X fails LOW
Which one of the following describes the expected plant response?

A. Pressurizer backup heaters will energize
B. The standby charging pump will start
C. Pressurizer backup heaters will trip if energized, and can be re-energized by going to set point override
D. Letdown flow will increase

A

B. The standby charging pump will start

32
Q

Unit 1 is operating at 100% power
The Pressurizer Level Master Controller is in REMOTE and AUTO.
The Pressurizer Level Control Selector switch is in ‘X’
The Heater Control Selector Level Trip switch is in ‘Both’
RRS is aligned to monitor average Tave
Which of the following is an effect on PLCS due to a loss of NNN-D12?

A. Back pressure control valve fail CLOSED
B. Letdown control valve fail CLOSED
C. PLCS Master Controller is de-energized
D. Normally running pump stops

A

A. Back pressure control valve fail CLOSED

33
Q

At what Pressurizer Pressure Master Controller output would you expect to see NO proportional heater output and NO pressurizer spray?

A. 0%
B. 16.5%
C. 33%
D. 50%

A

C. 33%

34
Q

A failure of which of the following transmitters would have a direct effect on Steam Bypass Control System Modulation set point?

A. RCA-LT-110X
B. RCB-LT-110Y
C. RCN-PT-100X
D. RCN-PT-100Y

A

C. RCN-PT-100X

35
Q

Which of the following is NOT a purpose of Main Spray Valve Bypass flow?

A. Maintain the temperature of spray piping
B. Provide a load for the proportional heaters minimum operation
C. Minimize thermal shock to the spray nozzles
D. Maintain uniform water chemistry with the RCS

A

B. Provide a load for the proportional heaters minimum operation

36
Q

Unit 1 is operating at 100% power
The Pressurizer Pressure Controller is in AUTO set at 2250 psia.
The Pressurizer Pressure Control Selector switch selected to RCN-PT-100X.
The Heater Control Selector Level Trip switch is in ‘Both’
RCN-PT-100X fails LOW
With no operator action which of the following will occur?

A. Reactor trip on high Pressurizer pressure
B. SIAS, CIAS, Reactor Trip
C. Alarms only, no plant effect
D. Pressurizer pressure will rise until the heater cutout at 2285 psia

A

A. Reactor trip on high Pressurizer pressure

37
Q

While operating at power, the in-service Letdown Flow Control Valve can be throttle OPEN using Pressurizer Level Controller, RCN-LIC-110, by either ____ the output in MANUAL, or by ____ the set point in Local-Auto.

A.  1.  Raising
      2.  Raising
B.  1.  Raising
      2.  Lowering
C.  1.  Lowering
      2.  Raising
D.  1.  Lowering
      2.  Lowering
A

B. 1. Raising

2. Lowering

38
Q

What is the basis for the Pressurizer level control band of 33-53% while AT POWER?
The low end of the band is set high enough to ensure ____ and the high end of the band is set low enough to ensure ____.

A. 1. The pressurizer heaters remain covered
2. The main and auxiliary spray nozzles are not submerged
B. 1. The pressurizer heaters remain covered
2. The proportional heaters can heat the water mass enough to maintain 2250 psia
C. 1. Pressurizer pressure does not lower to the SIAS set point on an uncomplicated reactor trip
2. The main and auxiliary spray nozzles are not submerged
D. 1. Pressurizer pressure does not lower to the SIAS set point on an uncomplicated Reactor trip
2. The proportional heaters can heat the water mass enough to maintain 2250 psia

A

A. 1. The pressurizer heaters remain covered

2. The main and auxiliary spray nozzles are not submerged

39
Q

Per 40OP-9CH01, CVCS Normal Operations, when shifting RCN-LIC-110, Pressurizer Level Control, from REMOTE/AUTO to LOCAL/AUTO, the board operator shall ensure the LOCAL set point is ____ the REMOTE set point, and RCN-LIC-110 ____.

A. 1. Matched to
2. Must be placed in MANUAL prior to selecting LOCAL/AUTO
B. 1. Matched to
2. May be taken directly from REMOTE/AUTO to LOCAL/AUTO
C. 1. ~5% below
2. Must be placed in MANUAL prior to selecting LOCAL/AUTO
D. 1. ~5% below
2. May be taken directly from REMOTE/AUTO to LOCAL/AUTO

A

A. 1. Matched to

2. Must be placed in MANUAL prior to selecting LOCAL/AUTO

Systems 11-13-19 (41 decks)

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