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LOCT Exam Bank > Plant Protection System > Flashcards

Plant Protection System Flashcards

1
Q

Which one of the following shows the correct unit(s) to express “Reactive Power”?

A. VARS
B. MVA
C. Joules
D. WATTS

A

Answer: A

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2
Q

A ____________ will generate a CWP from CPCs.

A. low DNBR pre trip (2 out of 4).
B. ASI out of range.
C. Tc or Th out of range.
D. high pressure pre trip (2 out of 4).

A

Answer: A

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3
Q

RCA-PT-101A (pressurizer Pressure) fails high tripping it’s RPS Channel. This instrument is bypassed. Subsequently, RCC-PT-101C fails low. Based on these indications, the Operating Crew is required to…

A. remove channel A pressurizer pressure high from bypass within 1 hour.
B. take no action.
C. bypass channel C pressurizer pressure high within 1 hour.
D. have Instrument Maintenance trip channel C pressurizer pressure high within 1 hour.

A

Answer: D

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4
Q

Unit operating at 100% full power. Channel “A” upper detector excore safety monitor fails HIGH. WHICH ONE of the following describes the expected response of Channel “A” Reactor Protection System to this failure?

A. VOPT, High Log power, High LPD and Low DNBR trips without pre-trips.
B. VOPT, High LPD and Low DNBR trips without pre-trips.
C. VOPT, High Log power, High LPD and Low DNBR trips and pre-trips.
D. VOPT, High LPD and Low DNBR trips and pre-trips.

A

Answer: D

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5
Q 
In the upgraded CPCs (Advant) which one of the following describes how the "A" CPC determines where its "Target CEAs" are located? CEA position information is provided by:
A. RSPT-2 to CPP-1A to CEAC-2A to CPC A
B. RSPT-1 to CPP-1A to CEAC-2A to CPC A
C. RSPT-2 to CPP-1A to CEAC-1A to CPC A
D. RSPT-1 to CPP-1A to CEAC-1A to CPC A
A

Answer: D

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6
Q

Unit 1 is operating at rated power. Because of a suspected problem, the Train A Loss of Power (LOP)/Load Shed (LS) relays are all bypassed. While the crew is looking into the Technical Specifications, a loss of off-site power occurs. Assuming no operator action, how would the electrical distribution system look after the electric plant transient is stabilize?

A. PBA-S03 de-energized, Diesel Generator running unloaded.
B. PBA-S03 energized by Diesel Generator
C. PBA-S03 de-energized, Diesel Generator never received a start signal.
D. PBA-S03 de-energized, Diesel Generator tripped on high temperature.

A

Answer: C

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7
Q

Given that the EDG load sequencer train A, sequencer has just been declared inoperable. Select the required action, per Improved Technical Specifications.

A. Deenergize the train A sequencer within 1 hour.
B. Declare train A ESF equipment inoperable immediately.
C. Perform an auto-test of train B BOP ESFAS in the next 4 hours.
D. Declare required features(s) supported by the inoperable sequencer inoperable when its redundant required feature(s) is inoperable after 4 hours.

A

Answer: D

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8
Q

Plant at 100% power Channel ‘A’ PPS bypassed due to failed SG-1 level transmitter Channel ‘B’ tripped due to failed RCS pressure transmitter. If the operator pressed the pushbutton to bypass Channel “C” SG-1 level transmitter, which one of the following would occur?

A. Reactor trip.
B. The pushbutton would have no effect.
C. channel would go into bypass.
D. 2 RTCB’s would open, but the reactor would not trip.

A

Answer: B

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9
Q

Channel B VOPT is bypassed and tripped. Channel A VOPT is in a tripped condition due to a power supply failure. What is the effect of depressing the Channel B VOPT bypass button?

A. no actual trip, but two trip breakers open.
B. Reactor trip.
C. Channel B VOPT will remain in bypass and Channel VOPT A will be in a tripped condition.
D. Channel B VOPT will remain in bypass and a PPS Trouble alarm will be received.

A

Answer: B

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10
Q

PPS cabinet channel “A”, lights labeled “P”, “T”, and “bypass” are lit in the window under “VAROVR PWR”. Channel “B” “VAROVER PWR” also has “P”, “T” labeled lights lit. What is the status of the variable overpower trip?

A. One more channel trip will cause a reactor trip.
B. A reactor trip should have occurred.
C. The reactor cannot trip automatically in this condition.
D. Two more channels must trip before the reactor will trip.

A

Answer: A

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11
Q

The plant is at 100% power. An operator incorrectly pushes one SG PRESS SETPOINT RESET pushbutton on the PPS remote operators module (ROM). This action will reset the low SG pressure trip setpoint:

A. 400 psia below existing SG pressure in the channel that the reset button was pushed.
B. 200 psia below existing SG pressure in all channels.
C. 400 psia below existing SG pressure in all channels.
D. 200 psia below existing SG pressure in the channel that the reset button was pushed.

A

Answer: D

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12
Q

Which of the following conditions will cause a CWP?

A. Low SG pressure pre trip
B. ASI pre trip
C. VOPT pre trip
D. Reactor Power Cutback

A

Answer: D

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13
Q

Which of the following describes the basis for the High Steam Generator Level Trip Setpoint?

A. Provided to protect the turbine from excessive moisture carryover.
B. Provides Steam Generator overpressure protection.
C. Provides protection against a loss of feedwater flow incident.
D. Provides protection in the event of an increase in heat removal by the secondary system.

A

Answer: A

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14
Q

Plant cooldown in progress. RCS pressure is 1500 psia. RCS temperature is 510°F. The “Low Pressurizer Pressure” pre-trip alarm has actuated and the operator has reset channels “A” and “C” ONLY of the low pressurizer pressure setpoint reset pushbuttons. Plant cooldown continues. With NO operator action, SIAS/CIAS will occur for…

A. “B” Train only, however, no equipment will start.
B. “B” Train only, with only “B” Train equipment actuating.
C. both “A” and “B” Trains, however, no equipment will start.
D. both “A” and “B” Trains, and all equipment will start.

A

Answer: D

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15
Q

Which of the following could cause the CPC calculated value of DNBR to INCREASE?

A. Power is increased by dilution with rods remaining at the ARO position.
B. Grid frequency decreases slightly.
C. Pressurizer pressure increases by 15 psi.
D. Power is increased by withdrawing Reg Grp 5 rods 10” to the ARO position.

A

Answer: C

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16
Q

If one of the six RPS matrices loses one of its two matrix power supplies which of the following will occur?

A. Two RTCBs will open and the reactor will trip.
B. Two RTCBs will open and the reactor will not trip.
C. No RTCBs will open and the reactor will not trip.
D. All four RTCBs will open and the reactor will trip.

A

Answer: B

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17
Q

Given the following conditions: RCS Temperature constant Rx Power constant Ignoring the effects of ASI, how would inserting CEA’s from ARO to 75 inches withdrawn affect the CPC calculated value of LPD?

A. Gradually decrease as CEAs are inserted.
B. No change, LPD is not affected by CEA position.
C. Gradually increase as CEAs are inserted.
D. No change until Group 5 is at 108 inches, then it will decrease.

A

Answer: C

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18
Q

A loss of PNC-D27 occurs. Which of the following describes the effect on PPS?

A. RTCBs A and B open
B. No RTCBs open
C. RTCB C ONLY opens
D. RTCBs A and C open

A

Answer: D

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19
Q

A loss of PNB-D26 occurs. Which of the following describes the impact on the reactor protection system?

A. Channel B input parameters all fail to trip setpoint value.
B. RTSG breakers A and C trip open.
C. There is no impact on the reactor protective system.
D. RTSG breakers B and D trip open.

A

Answer: D

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20
Q

Plant at 100% power. Channels B and D sense a containment pressure of 3.1 psig. Channels A and C are below the trip setpoint. Which ONE of the following will occur?

A. RTCBs B and D open, Train ‘B’ SIAS/CIAS and MSIS
B. Reactor trip, Train ‘B’ SIAS/CIAS and MSIS
C. RTCBs B and D open, full SIAS/CIAS and MSIS
D. Reactor Trip, full SIAS/CIAS and MSIS.

A

Answer: D

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21
Q

A control room operator attempts to manually initiate a SIAS using just two of the four switches on B05. Which one of the following is true?

A. Both SIAS Trains will actuate regardless of which two switches were used.
B. One train of SIAS ONLY will actuate.
C. One SIAS train’s valves will open, but the associated pumps will not start.
D. A SIAS actuation may not occur depending on which two switches are used.

A

Answer: D

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22
Q

During a down power, the CPCs shift from a value based on an actual value of ASI to a fixed power distribution (canned) ASI when the sum of the CPCs three excore NI detectors reaches …

A. 17%.
B. 15%.
C. 45%.
D. 51%.

A

Answer: C

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23
Q

During power ascension, the CPCs shift from a value based on a fixed power distribution (canned) to an actual value of ASI when…

A. any of the CPC’s three excore NI detectors reaches 17%.
B. the sum of the CPC’s three excore NI detectors reaches 51%.
C. the sum of the CPC’s three excore NI detectors reaches 17%.
D. any of the CPC’s three excore NI detectors reaches 51%.

A

Answer: B

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24
Q

Which of the following describes the operational bypass associated with the Core Protection Calculator trips? These trips are automatically…

A. bypassed when power drops to 1E-4%.
B. bypassed when power drops to 1E-2%.
C. placed in service when power increases to 1E-4%.
D. placed in service when power increases to 1E-2%.

A

Answer: C

25
Q

Which of the following will directly generate a CPC auxiliary trip?

A. High SG levels.
B. Asymmetric SG temperatures.
C. High SG pressure.
D. Low condenser vacuum.

A

Answer: B

26
Q

Plant at 100% power Channel ‘D’ PPS bypassed due to failed high RCS pressure (Narrow Range) transmitter. Channel ‘B’ PPS SG-2 level low has tripped due to failed transmitter. Channel ‘A’ RCS pressure (Narrow Range) transmitter now fails high. Based on these conditions, which of the following is correct?

A. The operator can not bypass channel ‘A’ RCS pressure transmitter.
B. If the operator bypasses the channel ‘A’ RCS pressure transmitter, that channel would go into bypass, while removing the channel ‘D’ transmitter from bypass.
C. The reactor would have tripped when the channel ‘A’ pressure transmitter failed.
D. 2 Reactor Trip Circuit Breakers (RTCBs) would open when the channel ‘A’ RCS pressure transmitter failed, but the reactor would not trip.

A

Answer: B

27
Q

Reactor is tripped. S/G 1 pressure - 1170 psia. S/G 2 pressure - 1165 psia. Pzr pressure - 1950 psia. Containment pressure 9.0 psig. S/G 1 level 0% (WR). S/G 2 level 15% (WR). SIAS and MSIS have occurred. What additional ESF actuations should be present at this time?

A. DAFAS, CSAS, CIAS
B. CIAS, AFAS-1, AFAS-2, DAFAS
C. CSAS, AFAS-1, AFAS-2, DAFAS
D. CSAS, AFAS-1, AFAS-2, CIAS

A

Answer: D

28
Q

WHICH ONE of the following describes the basis for the Reactor Protection System pressurizer pressure - high trip setpoint? Do not consider the SPLA trip part of RPS.

A. Prevent operation of the pressurizer safety valves in the event of a loss of off-site power.
B. Protect the reactor coolant system in the event of a SG overfeed condition.
C. Protect the reactor coolant system in the event of a loss of condenser vacuum.
D. Minimize operation of the steam generator safety valves in the event of a decrease in heat removal by the secondary system.

A

Answer: C

29
Q

The Reactor is subcritical at 1.0E-07% full power. RCS Tc is 565°F. RCS pressure is 2250 psia. Shutdown and Part-strength CEA groups fully withdrawn. The RCS is being inadvertently diluted. A positive Start-up Rate now exists on all four meters with no CEA motion. WHICH ONE of the following describes expected plant response, assuming no operator action, to the dilution accident?

A. Reactor power increases to approximately 3% full power.
B. Reactor trips on Variable Overpower.
C. Reactor power increases to the point of adding heat.
D. Reactor trips on High Log Power.

A

Answer: D

30
Q

To prevent the operator from inadvertently re-energizing a subgroup relay under test during 36ST-9SA02 Testing, the operator should:

A. maintain the test switch in mid position which holds the button in.
B. use test key without the T-Handle.
C. not use test key, push in test button manually by hand.
D. use test key with the T-Handle.

A

Answer: D

31
Q

How does COLSS interface with RPS?

A. Incore detectors are used to calibrate NI’s.
B. JSCALOR is used to calibrate safety channel NI’s.
C. RCS flow from COLSS feeds the DNBR trip.
D. Incore detectors are monitored for the DNBR trips.

A

Answer: B

32
Q

Reactor has tripped from 100% power. Reactor coolant system pressure is 1650 psia and dropping. Pressurizer level is 10% and dropping. Steam generator levels have turned at 36% wide range (they were never lower). Steam generator pressures are 1020 psia and rising. Containment pressure is 7.4 psig and rising. Safety Injection and containment isolation actuations have occurred. WHICH ONE of the following states the additional engineered safety features actuation(s) present assuming all systems functioned as designed?

A. Main steam isolation.
B. Containment spray actuation.
C. Auxiliary feedwater actuation.
D. Auxiliary feedwater actuation and main steam isolation.

A

Answer: A

33
Q

Reactor power at 104% full power and rising slowly. Pressurizer pressure at 2390 psia and rising slowly. Reactor trip circuit breakers 1 and 3 have failed to open. WHICH ONE of the following identifies the expected plant response, with no operator action, as the transient continues?

A. Supplementary Protection System deenergizes the CEDMs.
B. DAFAS will immediately actuate to provide additional feed to the SGs.
C. Core bulk boiling will occur to shut down the reactor via void coefficient.
D. Reactor Protection System trips reactor when power reaches 110% full power.

A

Answer: A

34
Q

The bypass of DAFAS can be accomplished by which of the following:

A. By bypassing the 4 Steam Generator level trips at the PPS Cabinets.
B. Using the 8 key switches in the PPS Cabinets.
C. Using the 4 key switches in Aux Relay Cabinets.
D. Using the 8 key switches in Aux Relay Cabinets.

A

Answer: D

35
Q

Diverse Auxiliary Feedwater Actuation System (DAFAS) actuations will be TERMINATED by:

A. Delta P lockout
B. SIAS
C. MSIS
D. #1 S/G level increasing to 15.8% WR

A

Answer: C

36
Q 
Given the following plant conditions: 
Containment pressure (NR) Channel A 3.1 psig 
Containment pressure (NR) Channel B 2.7 psig 
Containment pressure (NR) Channel C 3.1 psig 
Containment pressure (NR) Channel D 2.6 psig

Which of the following actuations would occur?

A. No actuations will occur.
B. “A” and “B” train SIAS/CIAS and MSIS.
C. “A” Train SIAS/CIAS and MSIS only.
D. “A” and “B” train SIAS/CIAS, CSAS and MSIS.

A

Answer: B

37
Q

Unit 1 is operating at rated power. An inadvertent Train A CSAS occurs. Based on these conditions, what actions, if any, are necessary to maintain the RCPs operating?

A. No actions should be necessary, since the CSAS is only Train A.
B. Cross-tie Essential Cooling Water with Nuclear Cooling Water.
C. Override and open NCA-UV-402, outside containment isolation valve on the NC return header.
D. Locally open NCA-UV-402, outside containment isolation valve on the NC return header.

A

Answer: C

38
Q

PPS indications are as follows: Pretrip and trip lamps are illuminated on Remote Operator’s Module (ROM) and Bistable Control Channel (BCP) channel “A” for “LO SG-1 LEVEL” (ESFAS). All three (3) bistable relay contact status indicating lights for the “LO SG-1 LEVEL” (ESFAS) bistable are illuminated on the BCP. No other abnormal indications exist on the PPS cabinets or ROM. Which ONE of the following events has occurred:

A. Reactor trip on Low SG-1 level.
B. Single channel trip on low SG-1 level “A” channel.
C. Half-leg AFAS actuation (1/2 equipment actuates).
D. Power supply failure to “A” channel initiation path (K-1).

A

Answer: B

39
Q

A loss of PKA-M41 occurs. Which of the following describes the impact on the reactor protection system?

A. RTSG breaker A trips open
B. all four RTSG breakers trip open
C. RTSG breakers A and C trip open
D. RTSG breaker A fails as is (no trips will function)

A

Answer: A

40
Q

Unit 1 is operating in Mode 5 with SDC in service. The ‘A’ LPSI pump is operating. An inadvertent Train ‘A’ RAS occurs. Based on these conditions, what actions, if any, are necessary to maintain and/or restore the plant to a stable condition?

A. Override and start the ‘A’ LPSI pump and restore SDC to service.
B. No actions should be necessary, since the RAS is only Train ‘A’.
C. Override and open the LPSI injection valves to restore SDC to service.
D. Override and open the minimum recirc valves to restore minimum flow protection for the ‘A’ LPSI pump.

A

Answer: A

41
Q

In order to reset a SIAS initiation in the AUX relay cabinet the operator must press…

A. and hold one reset button, for a minimum of 5 seconds.
B. both reset buttons, one at a time.
C. both reset buttons simultaneously.
D. either reset button.

A

Answer: D

42
Q

An ESD has occurred inside containment. CSAS has failed to actuate. The Secondary Operator, attempting to actuate CSAS manually, ONLY rotates the switches for the A and C Channels on B05. Which one of the following should be expected?

A. Either the Train A containment spray valve OR the CS pump will actuate, but NOT both.
B. A Train CSAS will actuate.
C. Both CSAS Trains will actuate.
D. No CSAS actuation will occur.

A

Answer: D

43
Q

The plant is at 100% power. Containment Pressure .1 psig. LEG 1-3 CSAS A LEG 2-4 - window 5B05A. LEG 1-3 CSAS B LEG 2-4 - window 5B05B. CSAS - window 5C04A. NO SIAS has actuated. The Reactor has not tripped. The operators stop the CS pumps as directed by procedure. If an SIAS were to now occur, which one of the following statements describes how the CS pumps would be restarted?

A. Taking the CS pump handswitch to START twice.
B. They pumps would auto start.
C. Taking the CS pump handswitch to START once.
D. The pumps must be started manually at the local breakers.

A

Answer: A

44
Q

“SIAS A” 1-3 is lit with 2-4 still dark on B05 due to a single matrix power supply loss. Which one of the following is indicated?

A. SIAS “A” 2-4 should be lit.
B. SIAS “A” pumps should be running.
C. SIAS “A” valves should be in their SIAS position.
D. SIAS “B” 1-3 should be lit.

A

Answer: D

45
Q

A plant startup is being performed and reactor power is 6% and slowly increasing. An inadvertent MSIS occurs, but the reactor does not trip. Which one of the following operator actions should be taken?

A. Adjust the ADVs position demand to 30% and modulate them.
B. Borate the reactor subcritical and maintain RCS temperatures with the Atmospheric Dump Valves (ADVs).
C. Trip the reactor and proceed to 40EP-9EO01, SPTAs.
D. Stabilize reactor power and reset MSIS.

A

Answer: C

46
Q

A SIAS was received on low pressurizer pressure. Pressure was subsequently restored to 2250 psia in the pressurizer. Containment pressure is 0 psig. At this time, the initiation reset buttons are pressed with the keylock switch in the “UNLK” position for all four channels. Then, at the “A” and “B” aux relay cabinets, the SIAS “LOCKOUT RESET” buttons are pressed one at a time. Which one of the following is correct?

A. Only the “A” train of SIAS actuated equipment may be repositioned without going to “OVERRIDE”.
B. Neither train of SIAS actuated equipment may be repositioned without going to “OVERRIDE”.
C. Both trains of SIAS actuated equipment may be repositioned without going to “OVERRIDE”.
D. All “A” and “B” train equipment that automatically started on the SIAS should have automatically stopped.

A

Answer: C

47
Q

An inadvertent CSAS has occurred with no other ESFAS signals actuated. Choose the statement which correctly describes how the CS pumps would be stopped and what condition the breaker would be in.

A. Override and stop the CS Pump. The breaker is now anti-pump.
B. Hold the handswitch in stop until the green light is on. The breaker is now anti-pumped.
C. Hold the handswitch in stop until the green light comes on. The breaker will respond to an active CSAS.
D. Override and stop the CS Pump. The breaker will respond to an actual CSAS.

A

Answer: B

48
Q

An inadvertent containment spray actuation, CSAS, occurs. The operator places both Containment Spray Pump hand switches in the stop position and overrides and closes both containment spray valves. The reactor trips and a valid Safety Injection Actuation Signal SIAS is received. Which one of the following is correct concerning starting the CS pumps?

A. Reset and then re-initiate CSAS.
B. Place the CS pump handswitch to START twice.
C. The CS pump control power must be cycled.
D. Place the CS pump handswitch to START once.

A

Answer: B

49
Q

The CRS directs the Secondary Operator to manually trip the reactor. The Secondary Operator depresses just two of the four manual trip pushbuttons on B05. Which one of the following is true?

A. The reactor will not trip because no TCBs will open.
B. The reactor may fail to trip depending on which two buttons were depressed.
C. The reactor will trip regardless of which two pushbuttons were depressed.
D. The reactor will not trip but all four RPS initiation relay lights on B05 will extinguish.

A

Answer: B

50
Q

The Reactor Coolant Flow Low RPS trip monitors…

A. SG DP and provides protection in the event of an under frequency condition.
B. RCP speed and provides protection in the event of an RCP shaft sheared.
C. SG DP and provides protection in the event of an RCP shaft sheared.
D. RCP speed and provides protection in the event of an under frequency condition.

A

Answer: C

51
Q

Plant at 100% power. Channels A and C sense a containment pressure of 3.2 psig. Channels B and D are below the trip setpoint. Which one of the following will occur?

A. No reactor trip, no RTCBs will open.
B. Reactor trip with all 4 RTCBs opening.
C. No reactor trip, but 2 RTCBs will open.
D. Reactor trip with only 2 RTCBs opening.

A

Answer: B

52
Q

Channel “A” LO PRESSURIZER PRESSURE PERMISSIVE light is lit. If the channel “A” LO PRESSURIZER PRESSURE BYPASS switch is turned to the BYPASS position, which of the following will occur.

A. There is no visible effect, and “A” channel input to SIAS, CIAS, MSIS and Rx trip are unaffected.
B. The “A” channel DNBR, LPD and low Pressurizer Pressure trips will by bypassed.
C. The “BYPASS” light comes on. SIAS, CIAS and LO Pressurizer Pressure Rx trip are now in 2 out of 3 logic.
D. The “BYPASS” light comes on, all four (4) channels of SIAS, CIAS, MSIS, and Lo Pressurizer Pressure Rx trips are bypassed.

A

Answer: C

53
Q

In addition to PPS trips, CPCs will also initiate which of the following?

A. AMI
B. CWP
C. AWP
D. RPCB

A

Answer: B

54
Q

Rx at 75% RTP Initially CEAs are ARO A single 12 finger CEA slips to 135 inches withdrawn No Rx trip occurs COLSS CEA position has not been updated Based on these conditions, the magnitude of the associated CEAC penalty factor will…

A. decrease over time reaching a zero value after 6 hours.
B. increase over time reaching a maximum after 6 hours.
C. increase over time reaching a maximum value after one hour.
D. not change for the next 6 hours, then increase over time reaching a maximum value after 24 hours.

A

Answer: B

55
Q

The plant is stable at 30% power. Power is ramped up at a rate of 15% per minute. With no operator action, approximately when will PPS (not CPC aux trips) trip the reactor ?

A. 8 minutes.
B. never.
C. 5 minutes.
D. 2 minutes.

A

Answer: D

56
Q

A combination of manual reactor trip pushbuttons which will NOT result in a reactor trip is:

A. 2 and 4.
B. 1 and 2.
C. 2 and 3.
D. 1 and 4.

A

Answer: A

57
Q

Given the following plant conditions:

Containment pressure (NR) Channel A 3.1 psig
Containment pressure (NR) Channel B 2.7 psig 
Containment pressure (NR) Channel C 3.1 psig 
Containment pressure (NR) Channel D 2.6 psig 
Which of the following actuations would occur?

A. No actuations will occur.
B. “A” and “B” train SIAS/CIAS and MSIS.
C. “A” Train SIAS/CIAS and MSIS only.
D. “A” and “B” train SIAS/CIAS, CSAS and MSIS.

A

Answer: B

58
Q

The Reactor Coolant Flow Low RPS trip monitors…

A. SG DP and provides protection in the event of an under frequency condition.
B. RCP speed and provides protection in the event of an RCP shaft sheared.
C. SG DP and provides protection in the event of an RCP shaft sheared.
D. RCP speed and provides protection in the event of an under frequency condition.

A

Answer: C

LOCT Exam Bank (58 decks)

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