Electrical (Class, Non-Class)

Question 1

Besides the breaker position, the ‘RED’ indicating light on a 4160 Class breaker (cubicle door) also indicates?

A. Closing Spring is charged.

B. Protective relays are functioning.

C. Anti-pump circuitry has continuity.

D. Trip coil has continuity.

Answer 1

D. Trip Coil has continuity

Question 2

A LOCA has resulted in a reactor trip and SIAS/CIAS initiation.

A ‘Brighter than normal green’ indication for the ‘A’ HPSI pump.

The switch is taken to the TRIP position and is released. What happens to the pump?

A. Nothing will happen.

B. The pump will enter an anti-pump condition.

C. The lockout relay will reset and the breaker will close and trip again if the initial fault is NOT cleared.

D. The lockout relay will reset and the breaker will close with its protection circuits bypassed.

Answer 2

C. The lockout relay will reset and the breaker will close and trip again if the initial fault is NOT cleared.

Question 3

In order to close the Alt. Feed breaker to PBA-S03 locally (using the local Control Switch), which of following interlocks MUST be satisfied?

A. Synch Check relay satisfied ONLY.

B. Both the DG and normal supply breakers to this bus are open ONLY.

C. Synch Switch on B01 for this breaker is ON.

D. Synch Check relay satisfied AND both the DG and normal supply breakers to this bus are open.

Answer 3

B. Both the DG and normal supply breaker to this bus are open ONLY.

(Since the process is Break Before Make - ‘sync’ does not matter)

Question 4

With a unit in MODE 1, which of the following describes the required AC Electrical sources which satisfies the LCO of Tech Spec 3.8.1, AC Sources - Operating?

A. One offsite circuit and one diesel generator each capable of supplying the onsite Class 1E Electrical Power Distribution System and both automatic load sequencers.

B. One offsite circuit and one diesel generator each capable of supplying the onsite Class 1E Electrical Power Distribution System and one automatic load sequencer.

C. Two offsite circuits and two diesel generators each capable of supplying the onsite Class 1E Electrical Power Distribution System and one automatic load sequencer.

D. Two offsite circuits and two diesel generators each capable of supplying onsite Class 1E Electrical Power Distribution System and both automatic load sequencers.

Answer 4

D. Two offsite circuits and two diesel generators each capable of supplying onsite Class 1E Electrical Power Distribution System and both automatic load sequencers.

Question 5

Unit is operating at rated power. One Diesel Generator becomes inoperable.

What Tech Spec actions must be completed within one hour?

A. Verify correct breaker alignment and indicated power availability for two offsite power sources.

B. Restore DG to operable status.

C. Determine that DG ‘B’ is not inoperable due to a common cause failure.

D. Declare required feature(s) supported by DG inoperable when its redundant required feature(s) is inoperable.

Answer 5

A. Verify correct breaker alignment and indicated power availability for two offsite power sources.

Question 6

Unit is operating at rated power.

NBN-X03 ESF Service Transformer detects a rapid pressure increase inside the Transformer’s casing.

Which breaker will NOT trip if currently closed?

A. PBA-S03 normal supply breaker.

B. PBB-S04 alternate supply breaker.

C. PBA-S03 alternate supply breaker.

D. NBN-X03 supply breaker.

Answer 6

C. PBA-S03 alt. supply breaker (PBA-S03 is disconnected from NBN-X03 in this situation)

Question 7

Four (4) potential transformers supply a voltage signal to eight (8) under voltage relays.

These relays are responsible for detecting a degraded voltage of ____ or an under voltage condition of ____.

A. <80% for >30 seconds, <90% instantaneously.

B. <90% for <30 seconds, <75% instantaneously.

C. <90% for >10seconds, <75% instantaneously.

D. <90% for >30 seconds, <75% instantaneously.

Answer 7

D. <90% for >30 seconds, <75% instantaneously.

Question 8

Which of the following supplies control power to ‘A’ 480 VAC Motor Control Center breakers?

A. PKA-D41

B. PKC-M43

C. PKA-M41

D. Self supplied, downstream of the circuit breaker.

Answer 8

D. Self supplied, downstream of the circuit breaker.

(Possible distractors is that they list PK buses)

Question 9

Unit 3 is at 100% power.

Unit 3 Trip occurs. Fast bus transfer fails.

What is the status of NNN-D16?

A. De-energized

B. Energized from PHB-M38

C. Energized from NHN-M19

D. Energized from NHN-M10

Answer 9

B. Energized from PHB-M38

Question 10

Unit is at 100%.

A fault occurs on PKC-M43.

With no operator action what is the status of 120 VAC Class Distribution Panel PNC-D27?

A. Energized from the back-up inverter PNC-N13

B. De-energized

C. Energized from voltage regulator PNC-V27

D. Energized from PHA-M35

Answer 10

C. Energized from voltage regulator PNC-V27.

Question 11

Unit is operating at rated power.

A loss of PKB-M42 occurs.

How can RCS Pressure be controlled?

A. Aux spray ‘A’ or ‘B’ Only

B. Main Spray Valves ONLY

C. Aux Spray ‘A’ ONLY

D. Aux Spray ‘A’ or the Main Spray Valves.

Answer 11

D. Aux Spray ‘A’ or the Main Spray Valves.

Question 12

The unit is operating at rated power.

A loss of PNC-D27 occurs. What impact (if any) will this loss have on BOP ESFAS?

A. Train ‘A’ CPIAS, CREFAS and FBEVAS actuations only.

B. Train ‘A’ and ‘B’ CPIAS, CREFAS, and FBEVAS will actuate.

C. Train ‘A’ BOP ESFAS will become de-energized and not function.

D. Nothing will actuate or become non-functional due to the power loss.

Answer 12

D. Nothing will actuate or become non-functional due to the power loss.

Question 13

Unit is operating in Mode 1.

The fuses for a bus potential transformer (PT) located in on PBA-S03 blow.

The PT supplies undervoltage relays 727-1 and 727-5.

A. PBA-S03 will load shed, the D/G will start and close in on the bus.

B. PBA-S03 will load shed, the D/G will need to be manually started to re-energize the bus.

C. The D/G will start and run unloaded while PBA-S03 remains energized from offsite power.

D. No Actuation should occur.

Answer 13

D. No Actuation should occur.

(Note: The BOP ESFAS system will only decide that an undervoltage condition exists if 2 out of the 4 inputs sense the condition. This coincidence logic prevents a signal failure (PT failure, for example) from activating ESF equipment.)

(Note: 1 PT supplies 1 Degraded and 1 Undervoltage Relay.)

Question 14

The ‘B’ Diesel Generator is Out of Service and tagged out.

You have been directed to transfer PBB-S04 from its normal to its alternate power source at the switchgear to support outage power configuration.

Which of the following describes the correct sequence to perform this operation?

A. Trip the normal feeder breaker using the local switch at PBB-S04. After the breaker is open, close the alternate feeder breaker at PBB-S04 completing the transfer.

B. After verifying that off-site power is supplying both the normal and alternate power supplies, close the alternate breaker using the local control switch at PBB-S04. After the breaker is closed, open the normal feed breaker at PBB-S04 completing the transfer.

C. Have the control room verify that the power supplies are in-phase. When this is done, close the alternate using the local switch at PBA-S04. After the breaker is closed, open the normal feed breaker at PBB-S04 completing the transfer.

D. After verifying that the power supplies are in-phase using the local synchronized check indication, close the alternate breaker using the local control switch at PBA-S04 completing the transfer.

Answer 14

A. Trip the normal feeder breaker using the local switch at PBB-S04. After the breaker is open, close the alternate feeder breaker at PBB-S04 completing the transfer.

Question 15

Loss of offsite power. Both diesel generators are running with normal voltage and frequency.

Normal and alternate power supply breakers for PBB-S04 are open. PBB-S04 is de-energized.

A possible reason that PBB-S04 is de-energized would be that…

A. A fast bus transfer relay failed to actuate.

B. A DG reverse power alarm/trip has actuated.

C. A Bus Fault has caused an 86 lockout on the normal supply breaker.

D. A synch check relay could not be satisfied because the bus was de-energized.

Answer 15

C. A Bus Fault has caused an 86 lockout on the normal supply breaker.

Question 16

How do you get an Override light to come on?

Answer 16

Taking the components hand switch to its actuated position.

Question 17

A SGTR has forces the Operating Crew to manually trip the reactor.

After reactivity has been verified, a SIAS and CIAS were initiated.

The Secondary Operator notices that AFB-P01 is not operating.

The Secondary Operator, needing to establish feed with AFB-P01, takes its control switch to START and releases and observes the following:

OVERRIDE light comes ON. Pump remains OFF.

Based SOLEY on given information, which one of the following can you attribute these indications to?

A. ‘A’ BOP ESFAS sequencer has failed.

B. The switch was taken to the wrong position to start the pump.

C. The switch needs to be taken to START one more time to start the pump.

D. The supply breaker is locked out.

Answer 17

D. The supply breaker is locked out.

(Note: ‘C’ answer is incorrect because it should have started when switch was taken to start. The override light came one because switch was taken to ESF actuated position. The 86 lockout can be reset by taking switch to off.)

Question 18

In addition to the DG being at rated speed and voltage, what conditions are needed for a DG breaker to automatically close on a LOP?

A. The alternate supply breaker open, and NO 86 lockout on alternate supply breaker ONLY.

B. The normal supply breaker open, and NO 86 lockout on the normal supply breaker ONLY.

C. BOTH the normal and alternate supply breakers open, and NO 86 lockout on either the normal or alternate supply breakers.

D. BOTH the normal and alternate supply breakers open, and NO 86 lockout on the supply breaker to the ESF transformer.

Answer 18

C. BOTH the normal and alternate supply breakers open, and NO 86 lockout on either the normal or alternate supply breakers.

Question 19

Which ONE of the following Unit combinations can be simultaneously energized by the GTGs?

A. 1 and 3 only

B. 1 and 2; or 1 and 3

C. 1 and 2; or 2 and 3

D. 1 and 3; or 2 and 3

Answer 19

B. 1 and 2, or 1 and 3 (Due to electrical line losses)

Question 20

An area operator discovers the white light is on 1E-NAN-S01J (Circulating Water Pump CWN-P01A) is out.

Circulating Water Pump CWN-P01A is running.

After replacing the Bulb, the light is still out.

There are no other abnormal conditions at the breaker.

A. The lockout relay circuit is reset.

B. The closing spring has actuated.

C. The lockout relay circuit is disabled.

D. The closing spring is not charged.

Answer 20

C. The lockout relay circuit is disabled. (Note: Question states the Circ. Water Pump is running.)

Question 21

Which one of the following identifies the meaning of a red light (RL) being lit at the local breaker panel for NBNS01J (Turbine Cooling Water Pump ‘A’)?

A. The breaker is closed and trip coil circuit continuity satisfactory.

B. The breaker is open and trip coil circuit continuity is satisfactory.

C. The breaker is closed and the closing springs are charged.

D. The breaker is closed (there is no other input to the red light).

Answer 21

A. The breaker is closed and trip coil circuit continuity is satisfactory.

Question 22

Unit operating in Mode 1.

A loss of control power occurs to NBN-S02. A three phase short occurs on the motor the ‘B’ Nuclear Cooling Water pump?

A. The ‘B’ NCW pump breaker will trip on over current.

B. The NBN-X02 Feed breaker (at NAN-S02) will lockout to clear the fault.

C. NO Protective actuations will occur. This fault must be cleared by the operator.

D. The Main Feed breaker (at NBN-S02) will lockout to clear the fault.

Answer 22

B. The NBN-X02 Feed breaker (at NAN-S02) will lockout to clear the fault.

(Possible distractors- breakers on NBN-S02 will not operate so fault goes up to NAN-S02)

Question 23

Unit is operating at 100% power, normal lineup. NKN-M45, non-class 125 VDC bus, is de-energized.

Reactor and main turbine have subsequently tripped.

Main Generator output breakers have been opened and excitation removed.

SPTA’s are in progress.

With no operator action, which one of the following describes the status of the listed electrical buses?

A. PBB-S04 and NAN-S02 are energized by offsite power.

B. PBA-S03 and NAN-S01 are both de-energized.

C. PBB-S04 is energized by ‘B’ DG and NAN-S02 is de-energized.

D. PBA-S03 is energized by offsite power and NAN-S01 is de-energized.

Answer 23

D. PBA-S03 is energized by offsite power and NAN-S01 is de-energized. NKN-M45 de-energized removes control power from NAN-S01 and NAN-S02

(Possible Distractors- PBA and PBB class buses are still power by offsite and NAN-S01 and NAN-S02 are de-energized).

Question 24

125 VDC distribution panel ‘G’ (NKN-D19) provides control power for…?

A. Main Turbine protection circuitry.

B. Main Turbine protection circuitry.

C. Water Reclamation Facility.

D. 480 VAC Cooling Tower load centers.

Answer 24

D. 480 VAC Cooling Tower Load Centers.

Question 25

What is the purpose of the 125 VDC Non-class system battery chargers? (Choose one answer)

A. Supply DC loads for both busses for at least 2 hrs.

B. Only supply the inverters for 2 hrs since they are the most vital load.

C. Supply DC loads and simultaneously charge the respective battery.

D. Only supply 1/2 of the normal DC loads while charging the battery.

Answer 25

C. Supply DC loads and simultaneously charge the respective battery.

Question 26

The Non-Class 125 VDC swing battery charger ‘EF’ be aligned to…

A. Both NKN-M45 and M46 (simultaneously).

B. NKN-M46 only.

C. NKN-M45 only.

D. Either NKN-M45 or M46 (but not at the same time).

Answer 26

D. Either NKN-M45 or M46 (but not at the same time).

Question 27

The input power to the NK Battery Charger is:

A. 120 VAC Distribution Panel

B. 480 Volt Motor Control Center

C. 480 Volt Load Center

D. 125 VDC Motor Control Center

Answer 27

B. 480 Volt Motor Control Center.

Question 28

The non class batteries will last a design MINIMUM of ____ if the associated battery chargers are lost.

A. 4 hours

B. 2 hours

C. 8 hours

D. 24 hours

Answer 28

B. 2 hours

Question 29

Unit is operating in Mode 1. A loss of NKN-45 has occurred.

How does this loss impact the 13.8 kV intermediate buses?

A. Control power for NAN-S06 must be transferred to its alternate source.

B. Control power for NAN-S05 has been lost until NKN-M45 can be restored.

C. Control power for NAN-S05 must be transferred to its alternate source.

D. Control power for NAN-S06 has been lost until NKN-M45 can be restored.

Answer 29

C. Control power for NAN-S05 must be transferred to its alternate source.

(Note: Middle of Non-class NK NN drawing. NKN-U45 normal power M45 and M46 Alternate. NKN-U46 normal power M46 and M45 Alternate.)

Question 30

Which of the following supplies control power to NAN-S02?

A. NKN-D41

B. NKN-M46

C. NKN-D42

D. NNN-D16

Answer 30

NKN-D42.

Question 31

The normal service transformers cooling units have both a normal and alternate power supply.

The transformers are equipped with an Auto-Throw over Switch that will select the alternate supply when the normal supply is lost.

After restoration of the normal supply, _________________. Power supplies for the control cabinets come from the _____ system (both normal and alternate).

A. The throw over switch must be manually reset, NH.

B. The throw over switch automatically selects the normal supply, NH.

C. The throw over switch must be manually reset, NG.

D. The throw over switch automatically selects the normal supply, NN.

Answer 31

A. The throw over switch must be manually reset, NH.

Question 32

NNN-D11 is _____ and located in the ____.

A. Grounded, Turb Bldg 100’

B. Ungrounded, Cont Bldg 120’

C. Ungrounded, Aux Bldg 120’

D. Grounded, Aux Bldg 100’

Answer 32

B. Ungrounded, Cont Bldg 120’

(Note: NNN-D11/D12 - Cont. Bldg 120’, NNN-D15 - Turb. 100’, NNN-D16 - Aux. 120’.)

Question 33

Which of the following is NOT a requirement for a fast bus transfer?

A. Generator Trip must have occurred

B. Early ‘B’ contact on NAN-S01 normal supply breaker must be closed

C. The BUS XFR SWITCH must be in MANUAL

D. NO bus lockout

Answer 33

C. The Bus XFR Switch must be in MANUAL

Question 34

Which of the following components has a Static Transfer Switch?

A. NNN-D12

B. NKN-D41

C. NKN-D43

D. NKN-M45

Answer 34

A. NNN-D12

(Note: NKN-M45 has MANUAL Mechanical interlocks)

Question 35

Unit is at rated power. Electric plant in a normal lineup.

The plant computer uninterruptible power supply (NQN-D01) is normally supplied power by….

A. NKN-M45 thru an inverter with NHN-M08 as the normal backup via a transfer switch.

B. NKN-M45 thru an inverter with NHN-M72 as the normal backup via a transfer switch.

C. NKN-M46 thru an inverter with NHN-M08 as the normal backup via a transfer switch.

D. NKN-M46 thru an inverter with NHN-M72 as the normal backup via a transfer switch.

Answer 35

A. NKN-M45 thru an inverter with NHN-M08 as normal backup via a transfer switch.

(Note: NHN-M72 can be a backup via a manual transfer switch.)

Question 36

Which of the following describes how a loss of NNN-D12 effectors the operation of the RPCS?

A. No RPCB actuation.

B. The system will function to drop CEAs and all turbine features will not operate.

C. The system will function to drop CEAs and run back the turbine and the setback feature will not function.

D. The system will function to drop CEAs, the run back feature will not function and the turbine will set back.

Answer 36

D. The system will function to drop CEAs, the run back feature will not function and the turbine will set back.

Question 37

Which one of the following identifies the meaning of a red light (RL) being lit at the local breaker panel for NBNS01J, Turbine Cooling Water Pump ‘A’?

A. The breaker is closed and trip coil continuity is satisfactory.

B. The breaker is open and trip coil circuit continuity is satisfactory.

C. The breaker is closed and the closing springs are charged.

D. The breaker is closed (there is no other input to the red light).

Answer 37

A. The breaker is closed and trip coil circuit continuity is satisfactory.

Question 38

A 4160 V breaker was in the open position when a loss of breaker control power occurred.

An operator is attempting to operate the breaker locally for the first time since control power was lost.

Which of the following is true of local manual operation of a 4160 V breaker if no breaker control power is available?

A. The close button will not function due to the loss of control power.

B. The close button will function but the trip button will not.

C. Both the close pushbutton and the trip pushbutton will perform their functions.

D. Neither the trip button nor the close button will function.

Answer 38

C. Both the close pushbutton and the trip pushbutton will perform their functions.

Question 39

Which of the following describes the function of the “Kirk Key” Interlock found on 480 V Load Centers?

A. Ensures the 13.8 KV supply breaker is open prior to operating the Load Interrupter.

B. Fail Safe switch which prevents the Load Interrupter from being opened under load.

C. Automatically trips the main feeder breaker when the Load Interrupter is opened.

D. Fail safe device to prevent the closing springs from discharging while racking in the breaker.

Answer 39

B. Fail Safe switch which prevents the Load Interrupter from being opened under load.

Question 40

Unit is operating in Mode 1.

A loss of control power occurs to NBN-S02. A three phase short occurs on the motor for the ‘B’ Nuclear Cooling Water Pump.

How does the electric plant respond to this scenario?

A. The ‘B’ NCW pump breaker will trip on over current.

B. The Main Feed Breaker (at NBN-S02) will lockout to clear the fault.

C. NO protective actuations will occur. This fault must be cleared by the operator.

D. The NBN-X02 Feed Breaker (at NAN-S02) will lockout to clear the fault.

Answer 40

D. The NBN-X02 Feed Breaker (at NAN-S02) will lockout to clear the fault.

Question 41

You notice that the CLEAR light on the cubicle that houses the breaker for the ‘A’ High Pressure Safety Injection pump at PBA-S03 is OUT.

At the same cubicle, the RED and WHITE lights are on.

Based on these conditions, which of the following is true?

A. The breaker has Tripped due to a fault.

B. The breaker is closed with all conditions NORMAL.

C. The lockout relay has lost continuity and can NOT operate.

D. The breaker’s closing spring is NOT charged.

Answer 41

D. The breaker’s closing spring is NOT charged.