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Systems 2 - Electrical

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SRO Nuclear Operations (Practice Exams) Quiz on Systems 2 - Electrical, created by Lauren Neuburger on 09/10/2016.
Lauren Neuburger
Quiz by Lauren Neuburger, updated more than 1 year ago
Lauren Neuburger
Created by Lauren Neuburger over 7 years ago
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Resource summary

Question 1

Question
If a short circuit appears on a power line with recloser protection...
Answer
  • A. the recloser closes when the fault clears ONLY.
  • B. the recloser will NOT close on a faulted line.
  • C. the recloser closes after a time delay only.
  • D. the recloser closes after a time delay ONLY if the fault has cleared.

Question 2

Question
An electrical problem has resulted in the unloading of transformer XST2 and opening of MOAS 8012 (disconnect for XST2). Which of the following identifies ALL of the requirements which must be met to close MOAS 8012 in order to restore power to XST2? Transformer XST2 must be unloaded, ...
Answer
  • A. the East/West lockout relay must be reset, and high speed ground switch (GXST2) must be open.
  • B. the East/West lockout relay must be reset, and high speed ground switch (GXST2) must be closed.
  • C. XST2 lockout relay must be reset, and high speed ground switch (GXST2) must be closed.
  • D. XST2 lockout relay must be reset, and high speed ground switch (GXST2) must be open.

Question 3

Question
The East bus of the 345 Kv switchyard has experienced a lockout relay (LOR) trip. Which of the following breakers are expected to open due to the LOR?
Answer
  • A. DeCordova breaker (8060), Parker breaker (8040)
  • B. Comanche breaker (8090), Parker breaker (8040)
  • C. Venus breaker (8050), DeCordova breaker (8060)
  • D. Comanche breaker (8090), Venus breaker (8050)

Question 4

Question
Who is responsible for all high voltage switching orders (138 and 345 KV) at CPNPP?
Answer
  • A. The Transmission Grid Controller and the Shift Manager.
  • B. The Transmission Grid Controller and the Shift Operations Manager.
  • C. Unit Supervisor and the Shift Manager.
  • D. Field Support Supervisor and the Shift Manager.

Question 5

Question
Given the following conditions: -Both units are operating at 100% RTP. -The switchyard in a normal alignment. Which of the following would describe the plant electrical system alignment should INCOMING 138 KV XFMR FDR BKR 7040 (East Bus Supply to XST1) trip open?
Answer
  • A. U1 Safeguards - XST1 U2 Safeguards - XST1 U1 Non-Safeguards - 1ST U2 Non-Safeguards - 2ST
  • B. U1 Safeguards - XST2 U2 Safeguards - XST1 U1 Non-Safeguards - 1UT U2 Non-Safeguards - 2UT
  • C. A. U1 Safeguards - XST2 U2 Safeguards - XST1 U1 Non-Safeguards - 1ST U2 Non-Safeguards - 2UT
  • D. A. U1 Safeguards - XST1 U2 Safeguards - XST1 U1 Non-Safeguards - 1UT U2 Non-Safeguards - 2UT

Question 6

Question
Unit 1 is operating at 100% RTP with the switchyard in a normal alignment. Which of the following would describe the Unit 1 electrical system line up should INCOMING 345 KV XFMR FDR BKR 7980 (W6 - West Bus Supply to 1ST and XST2) open due to a low gas pressure trip?
Answer
  • A. Unit #1 safeguards - XST1 Unit #1 non-safeguards - 1UT
  • B. Unit #1 safeguards - XST1 Unit #1 non-safeguards - 1ST
  • C. Unit #1 safeguards - XST2 Unit #1 non-safeguards - 1UT
  • D. Unit #1 safeguards - XST1 Unit #1 non-safeguards - 1ST

Question 7

Question
Given the following conditions: -The 138 KV DeCordova line is out of service. -The 345 KV East Bus is also out of service, rendering the following 345KV lines unavailable: --Parker #1 --DeCordova --Everman Under these conditions, which of the following transmission line configurations\ satisfies the Technical Specifications requirement for two physically independent circuits between the offsite transmission network and the onsite Class 1E Distribution System? 138 KV Stephenville and 345 KV ...
Answer
  • A. Venus.
  • B. Parker #2.
  • C. Wolf Hollow.
  • D. Comanche Switch.

Question 8

Question
Given the following conditions: -Glen Rose Transmission (GRT) is planning to perform non-emergent, non-routine testing on one of the switchyard diesel generators. -In order to perform the testing a vendor must enter the switchyard who is not badged at Comanche Peak. Which of the following describes the notification and switchyard entry requirements of STA-629, Switchyard Control and Transmission Grid Interface? A minimum of 35 days in advance of the testing the GRT Manager must notify the CPNPP...
Answer
  • A. Switchyard Coordinator. The GRT escort and the vendor shall brief the CPNPP Switchyard Coordinator who will then grant access to the switchyard.
  • B. Electrical Work Window Manager. The GRT escort and the vendor shall brief the CPNPP Switchyard Coordinator who will then grant access to the switchyard.
  • C. Switchyard Coordinator. The GRT escort and the vendor shall brief the CPNPP Shift Manager who will then grant access to the switchyard.
  • D. Electrical Work Window Manager. The GRT escort and the vendor shall brief the CPNPP Shift Manager who will then grant access to the switchyard.

Question 9

Question
With the 138 KV DeCordova line out of service, which of the following transmission line configurations satisfies the Technical Specifications requirement for two physically independent circuits between the offsite transmission network and the onsite Class 1E Distribution System?
Answer
  • A. 138 KV Stephenville and 345 KV Venus
  • B. 138 KV Stephenville and 345 KV Parker #2
  • C. 138 KV Stephenville and 345 KV Wolf Hollow
  • D. 138 KV Stephenville and 345 KV Comanche

Question 10

Question
Given the following conditions: -Unit 1 is operating at 35% power in a normal system alignment. -Transformer 1UT experiences a Differential Current Relay actuation (87/1UT). -All others systems function as designed and NO other failures occur. Which of the following is the resultant electrical bus status for Unit 1? The Non-Safeguards 6.9 kV Buses __________; the 6.9 kV Safeguards Buses are energized by __________.
Answer
  • A. fast transfer to Transformer 1ST: Transformer XST1
  • B. slow transfer to Transformer 1ST: Transformer XST1
  • C. fast transfer to Transformer 1ST: Transformer XST2
  • D. slow transfer to Transformer 1ST: Transformer XST2

Question 11

Question
Which of the following describes the ALTERNATE power supplies to the Unit 1 and Unit 2 Safeguards 6.9KV Buses?
Answer
  • A. U1 - XST1; U2 - XST1
  • B. U1 - XST1; U2 - XST2
  • C. U1 - XST2; U2 - XST1
  • D. U1 - XST2; U2 - XST2

Question 12

Question
Assuming Unit 2 is in a normal full-power electrical alignment, if the Main Generator trips from 100% power to the Unit 2 Non-Safeguards 6.9 KV Buses will...
Answer
  • A. fast transfer to 2UT, Unit 2 Auxiliary Transformer.
  • B. fast transfer to 2ST, Unit 2 Station Service Transformer.
  • C. slow transfer to 2UT, Unit 2 Auxiliary Transformer.
  • D. slow transfer to 2ST, Unit 2 Station Service Transformer.

Question 13

Question
Assume a loss of XST2 occurs and all automatic actions occur as designed. Which of the following describes the condition of the Auxiliary Feedwater Pumps on Unit 1 following this event?
Answer
  • A. MDAFWP 1-01 running, MDAFWP 1-02 stopped and TDAFWP running.
  • B. Both MDAFWPs stopped and TDAFWP running.
  • C. MDAFWP 1-01 running, MDAFWP 1-02 stopped, and TDAFWP stopped.
  • D. Both MDAFWPs running and TDAFWP running.

Question 14

Question
Given the following conditions: -Unit 1 is operating at 100%, with the 6.9 KV systems in the normal alignment. -A fault occurs on the supply line from the switchyard to the Unit 1 safeguards buses. Which of the following describes the expected alignment of power supplies to the 6.9KV buses for Unit 1?
Answer
  • A. XST2 supplying the safeguards buses, 1UT supplying the non-safeguards buses
  • B. XST2 supplying the safeguards buses, 1ST supplying the non-safeguards buses
  • C. XST1 supplying the safeguards buses, 1ST supplying the non-safeguards buses
  • D. XST1 supplying the safeguards buses, 1UT supplying the non-safeguards buses

Question 15

Question
During power operations, one of the Pressurizer PORVs begins leaking by. The Unit 1 Supervisor directs that the block valves be closed and power removed from both block valves temporarily. Which of the following identifies the power supplies for the PRZR PORV BLOCK VLVs, 8000A and 8000B?
Answer
  • A. DC DIST PNL 1ED1-1 : DC DIST PNL 1ED2-1
  • B. 118 VAC DIST PNL 1EC1 : 118 VAC DIST PNL 1EC2
  • C. 480 VAC MCC 1EB3-2 : 480 VAC MCC 1EB4-2
  • D. 480 VAC MCC 1EB2-1 : 480 VAC MCC 1EB1-2

Question 16

Question
Which of the following identifies a Train A and a Train B 480 VAC power supply? (Train A; Train B)
Answer
  • A. 1ED1-1; 1ED2-1
  • B. 1EB3-1; 1EB4-2
  • C. 1EC1; 1EC2
  • D. 1EB2; 1EB1

Question 17

Question
Given the following conditions: -Unit 2 is at 45% power. -A Main Transformer sudden pressure relay actuates due to a fire. -The Main Generator de-energizes due to an 86-1 lockout. Which of the following describes the plant response?
Answer
  • A. The Reactor and Main Turbine will trip. The Fire Protection Deluge Valves will automatically open.
  • B. The Main Turbine will trip. The Fire Protection Deluge Valves must be manually opened.
  • C. The Reactor and Main Turbine will trip. The Fire Protection Deluge Valves must be manually opened.
  • D. The Main Turbine will trip. The Fire Protection Deluge Valves will automatically open.

Question 18

Question
Unit 1 Safeguards Buses are being supplied from the Preferred Offsite Electrical Source when a loss of XST2 occurs. All automatic actions occur as designed. Which of the following describes the condition of Unit 1 following this event?
Answer
  • A. 1EA1-1 & 1EA2-1 open, 1EA1-2 & 1EA2-2 closed, TDAFWP stopped, and both MDAFWPs running.
  • B. 1EA1-1 & 1EA2-1 open, 1EA1-2 & 1EA2-2 closed, TDAFWP running, and both MDAFWPs running.
  • C. 1EA1-1 & 1EA2-1 closed, 1EA1-2 & 1EA2-2 open, TDAFWP stopped, and both MDAFWPs running.
  • D. 1EA1-1 & 1EA2-1 closed, 1EA1-2 & 1EA2-2 open, TDAFWP running, and both MDAFWPs running.

Question 19

Question
Which of the following describes the correct configuration of fast and slow transfer capability provided for the supplies to the 6.9 kv buses?
Answer
  • A. non-safeguards have fast; safeguards have fast
  • B. non-safeguards have slow; safeguards have fast
  • C. non-safeguards have fast and slow; safeguards have slow
  • D. non-safeguards and safeguards have fast and slow

Question 20

Question
The 6.9 Kv Non-Safeguards Buses will fast transfer to the alternate power supply provided the alternate supply voltage is greater than the setpoint value, the phase angle between the supply voltages is within _____ and less than _______ has elapsed.
Answer
  • A. 40 degrees, 1.0 second
  • B. 40 degrees, 0.25 second
  • C. 25 degrees, 1.0 second
  • D. 25 degrees, 0.25 second

Question 21

Question
Unit 2 is operating at 100% power with the electrical plant in a normal alignment. Unit Auxiliary Transformer, 2UT has received a sudden pressure alarm. Which of the following describes the expected response of 2UT and Startup Transformer 2ST?
Answer
  • A. The 2ST supply breakers to the non-safeguards buses close and then the 2UT supply breakers to the non-safeguards buses open.
  • B. The 2UT supply breakers to the non-safeguards buses open and, if phase angles match within 40 degrees, the 2ST supply breakers to the non-safeguards buses close.
  • C. The 2ST supply breakers to the non-safeguards buses open and, if phase angles match within 40 degrees, the 2UT supply breakers to the non-safeguards buses close.
  • D. The 2UT supply breakers to the non-safeguards buses close and then the 2ST supply breakers to the non-safeguards buses open.

Question 22

Question
While transferring power from 2UT to 2ST during a normal plant shutdown, the handswitch for 2ST supply breaker to the non-safeguards bus 2A1(Breaker 2A1-2) is taken to the CLOSE position. The following indications are observed WITHOUT the transfer occurring. -Red position indicating light for Bkr 2A1-1 (from 2UT) LIT. -Green position indicating light for Bkr 2A1-2 (from 2ST) LIT. -2A1 bus voltage is 6.9 KV. -Synchroscope is at the 12 o'clock position. -Synchroscope lights are dark. - Zero running volts. What of the following is the likely cause for the failure of the bus transfer?
Answer
  • A. 2ST has NO power and thus the transfer is blocked.
  • B. The anti-parallel relay did NOT open 2UT supply breaker 2A1-1 to allow 2ST supply breaker 2A1-2 to close.
  • C. The synchronizing switch is in the OFF position.
  • D. The spring charging motor for 2UT supply breaker 2A1-1 is in the OFF position.

Question 23

Question
Which of the following are the indications that a slow transfer of 6900 V Safeguards bus 1EA1 has occurred after a loss of Startup Transformer XST2? Breaker 1EA1-2. 1EA1 Alternate Feeder is...
Answer
  • A. closed, DG1 running unloaded, BOS loads only sequenced on.
  • B. closed, DG1 NOT running, BOS loads only sequenced on.
  • C. open, DG1 running loaded, BOS loads only sequenced on.
  • D. open, DG1 running loaded with the previously operating loads on the bus.

Question 24

Question
The anti-parallel interlock with the class 1E 6.9 KV Electrical Distribution System prevents paralleling...
Answer
  • A. the preferred and alternate power sources.
  • B. the Emergency Diesel Generator and either the preferred or alternate power sources.
  • C. the Emergency Diesel Generator and the preferred power source ONLY.
  • D. the Emergency Diesel Generator and the alternate power source ONLY.

Question 25

Question
Which of the following conditions will result in the automatic closure of a Diesel Generator (DG) output breaker?
Answer
  • A. NO LOR actuations on 1EA1, 1EA1-1 supplying the bus, and a normal start of the DG is initiated.
  • B. 86-1 LOR actuated on 1EA1, 1EA1-1 and 1EA1-2 are open, and the DG started automatically due to bus undervoltage.
  • C. 86-2 LOR actuated on 1EA1, 1EA1-1 and 1EA1-2 are open, and the DG started automatically due to a Safety Injection.
  • D. NO LOR actuation on 1EA1, XST2 deenergized, 1EA1-1 fails to open (remains closed), and the DG started automatically due to bus undervoltage.

Question 26

Question
Which of the following describes the operation of a 480V switchgear breaker that has been opened locally following a loss of DC control power?
Answer
  • A. Breaker can be closed remotely one time if the breaker is in the TEST position.
  • B. Breaker CANNOT be closed until the breaker is reset by removing and then replacing the fuse block.
  • C. Breaker can be closed one time locally using the switch on the cubicle door.
  • D. Breaker CANNOT be closed again until the closing springs are manually charged.

Question 27

Question
Given the following conditions: -Unit 2 is in a normal operating alignment at 100% power. -An 86-1/2EA1 Lockout Relay actuation occurs on Safeguards Bus 2EA1. -The Electrical Distribution System responds as expected. -NO operator actions have been performed. Which of the following identifies the status of Safeguards Bus 2EA1 power supplies? Diesel Generator 2-01 is...
Answer
  • A. stopped, Breaker 2EG1 is open, and Safeguards Bus 2EA1 is deenergized.
  • B. running, Breaker 2EG1 is closed, and Safeguards Bus 2EA1 is energized.
  • C. running, Breaker 2EA1-1 is open, and Safeguards Bus 2EA1 is deenergized.
  • D. stopped, Breaker 2EA1-2 is closed, and Safeguards Bus 2EA1 is energized.

Question 28

Question
Given the following conditions: -Unit 2 is in MODE 1. -An XST 1 Transformer fault has just occurred. -Component Cooling Water (CCW) Pump 2-01 was running. -CCW Pump 2-02 is in standby. If Safeguards Bus 2EA2 receives an 86-2 Lockout, which of the following identifies when CCW Pump 2-02 is started?
Answer
  • A. After the 86-2 Lockout on Bus 2EA2 is reset, due to low pressure on Train A CCW.
  • B. When directed by procedure, the pump is manually started.
  • C. At the appropriate step on the Blackout Sequencer, the pump is started.
  • D. Immediately after Bus 2EA2 is reenergized, due to low pressure on Train A CCW.

Question 29

Question
Given the following conditions with Unit 1 in MODE 1: -An XST2 Transformer fault has just occurred. -Train A Component Cooling Water Pump was running. -Train B Component Cooling Water Pump was in Standby. If Safeguards Bus 1EA1 receives an 86-2 Lockout, which of the following identifies when Train B Component Cooling Water (CCW) Pump will start?
Answer
  • A. At the appropriate step in the Blackout Sequencer.
  • B. When the operator manually starts it.
  • C. After the 86-2 Lockout on Bus 1EA1 is reset, due to low pressure on Train A CCW.
  • D. Immediately after Bus 1EA2 is reenergized, due to low pressure on Train A CCW.

Question 30

Question
Unit 2 Safeguard buses are in a normal alignment for MODE 1 operation. An 86-1/2EA1 lockout relay actuation occurs on 2EA1. Assuming the electrical distribution system responds as expected, what is the final status of 2EA1 power supplies?
Answer
  • A. DG 2-01 stopped, 2EG1 open and 2EA1 deenergized.
  • B. DG 2-01 running, 2EG1 open and 2EA1 deenergized.
  • C. DG 2-01 running, 2EG1 closed and 2EA1 energized.
  • D. DG 2-01 stopped, 2EA1-2 closed and 2EA1 energized.

Question 31

Question
If an SI occurs while the Emergency Diesel Generator is paralleled with offsite power, the preferred class 1E supply breaker...
Answer
  • A. will remain closed, the DG breaker will open and the DG will continue to run in standby.
  • B. will remain closed, the DG and output breaker will trip, the SI signal will then restart DG to run in standby.
  • C. will open the DG breaker will remain closed and continue to supply the class 1E bus.
  • D. and the DG breaker will open, all loads will strip from the bus, then the DG breaker will reclose.

Question 32

Question
Which of the following describes a design feature of the Second Level Undervoltage Relays?
Answer
  • A. Starts the Emergency Diesel Generators and initiates a Blackout Sequencer.
  • B. Provides transfer to an energized Offsite Power source upon a loss of bus voltage.
  • C. Protects the 1E motors from a low voltage/high current condition by opening the Preferred and Alternate Feeder Breakers.
  • D. Ensures the opening of the Alternate Feeder Breaker within one second after the Preferred Feeder Breaker closes.

Question 33

Question
With Unit 1 in MODE 1, a fault on transformer 1ST causes a 1ST lockout relay to trip. 6.9 KV Safeguards Busses 1EA1 and 1EA2 are expected to be energized by...
Answer
  • A. XST1 and NO Blackout Sequencer actuation will occur.
  • B. XST2 and the Blackout Sequencer will be sequencing loads.
  • C. XST1 and the Blackout Sequencer will be sequencing loads.
  • D. XST2 and NO Blackout Sequencer actuation will occur.

Question 34

Question
Given the following conditions: -Unit 2 Safeguard buses are in a normal alignment for MODE 1 operation. -An 86-2/2EA1 lockout relay actuation occurs on 6.9 KV Safeguards Bus 2EA1. -NO operator actions are taken. What is the final expected status of 2EA1 power supplies, Emergency Diesel Generator 2-01 (DG 2-01), and the Emergency Diesel Generator Output Breaker 2EG1?
Answer
  • A. DG 2-01 stopped, Alternate Feeder Breaker 2EA1-2 closed, and 2EA1 energized.
  • B. DG 2-01 running, 2EG1 open, and 2EA1 deenergized.
  • C. DG 2-01 running, 2EG1 closed, and 2EA1 energized.
  • D. DG 2-01 stopped, 2EG1 open, and 2EA1 deenergized.

Question 35

Question
Given the following conditions: -Unit 2 is in a normal operating alignment at 100% power. -An 86-2/2EA1 Lockout Relay actuation occurs on Safeguards Bus 2EA1. -The Electrical Distribution System responds as expected. -NO operator actions have been performed. Which of the following identifies the final status of Safeguards Bus 2EA1 power supplies? Diesel Generator 2-01 is...
Answer
  • A. stopped, Breaker 2EG1 is open, and Safeguards Bus 2EA1 is deenergized.
  • B. running, Breaker 2EG1 is closed, and Safeguards Bus 2EA1 is energized.
  • C. running, Breaker 2EA1-1 is open, and Safeguards Bus 2EA1 is deenergized.
  • D. stopped, Breaker 2EA1-1 is closed, and Safeguards Bus 2EA1 is energized.

Question 36

Question
The response of the class 1E 6.9 KV Electrical Distribution System if an SI occurs while the Emergency Diesel Generator is paralleled with the bus is the preferred class 1E supply breaker will...
Answer
  • A. open and the DG breaker will remain closed and continue to supply the class 1E bus.
  • B. remain closed, the DG output breaker will trip, and the SI signal will then restart the DG to run in standby.
  • C. remain closed, the DG breaker will open, and the DG will continue to run in standby.
  • D. open and the DG breaker will open, all loads will strip from the bus, then the DG breaker will reclose.

Question 37

Question
Given the following conditions: -Unit 1 is in a normal MODE 1 alignment at 70% power. -Excessive loading on the 345 KV Grid caused 6.9 KV Bus voltages to slowly degrade to approximately 5800 volts. Assuming 138 KV Grid voltage is normal and systems function as designed, what automatic actions are expected to occur? Safeguards Buses 1EA1 and 1EA2...
Answer
  • A. transfer to the Diesel Generator, Blackout Sequencer reloads Blackout loads on 1EA1 and 1EA2, Non-Safeguards Buses 1A1 through 1A4 transfer to the Alternate Source.
  • B. transfer to the Diesel Generator, Blackout Sequencer reloads Blackout loads on 1EA1 and 1EA2, Non-Safeguards Buses 1A1 through 1A4 do not transfer to the Alternate Source.
  • C. slow transfer to the Alternate Source, Blackout Sequencer reloads Blackout loads on 1EA1 and 1EA2, Diesel Generators remain stopped, Non-Safeguards Buses 1A1 through 1A4 are not affected.
  • D. slow transfer to the Alternate Source, Blackout Sequencer reloads Blackout loads on 1EA1 and 1EA2, Diesel Generators start and remain unloaded, Non-Safeguards Buses 1A1 through 1A4 are not affected.

Question 38

Question
The Safeguards Electrical System second level undervoltage trip provides...
Answer
  • A. transformer protection against overcurrent.
  • B. protection against out-of-phase paralleling of 6.9 KV power sources.
  • C. low voltage/high current protection of 1E motors.
  • D. protection against effects of reverse power condition on 6.9 KV bus components.

Question 39

Question
Given the following conditions: -Unit 1 Train A Diesel Generator is paralleled to 1EA1 for an operability run after being returned to service following a repair of the governor control system. -After the Diesel is paralleled to the bus with Incoming Breaker 1EA1-1 closed, a Safety Injection occurs. -All systems function as designed. What is the status of 1EA1 and Train A Diesel Generator? Incoming Breaker 1EA1-1...
Answer
  • A. and Incoming Breaker 1EA1-2 both open and 1EA1 is energized via Train A Diesel Generator.
  • B. will remain closed, Train A Diesel Generator will trip, and the SI signal will then restart Train A Diesel Generator to run in standby.
  • C. will remain closed, Train A Diesel Generator breaker will open, and the DG will continue to run in standby.
  • D. and Train A Diesel Generator breaker will open, all loads will strip from the bus, then the DG breaker will reclose.

Question 40

Question
Given the following conditions: -Unit 2 is at full power. -Unit 1 is shutdown and preparing to energize the Unit 1 Main Transformers via the backfeed configuration. Which of the following identifies the reason for notifying Unit 2 personnel prior to backfeeding the Unit 1 Main Transformers? Unit 2...
Answer
  • A. Main Generator ground relays may "drop" due to the site grounding scheme.
  • B. GEN NEG SEQ CURRENT HI alarm may be received due to an inrush of current to the Unit 1 Transformers.
  • C. GEN OVRVOLT alarm may be received due to an out rush of current from the Unit 2 Transformers.
  • D. Main Transformer ground relays may "drop" due to the site grounding scheme.

Question 41

Question
Given the following conditions: -Comanche Peak has been notified by the QSE Generation Controller that conditions on the ERCOT grid are such that the Tech Spec upper and lower voltage limits for the 6.9 KV Safeguards buses could be exceeded. -The Shift Manager has directed performance of OPT-215, Class 1E Electrical System Operability. Which of the following lists the lower and upper voltage limits required for the Comanche Peak 6.9 KV Safeguards Buses to be considered OPERABLE in accordance with Technical Specification 3.8.9, Distribution Systems – Operating, Surveillance Requirement SR 3.8.9.1 and OPT-215? (Lower and Upper Limit)
Answer
  • A. 6300 V, 7000 V
  • B. 6500 V, 7100 V
  • C. 6450 V, 7150 V
  • D. 6480 V, 7150 V

Question 42

Question
Given the following conditions: -A Loss of Offsite Power has occurred with Unit 2 in MODE 3. -All offsite circuits have been declared INOPERABLE. -Both Emergency Diesel Generators are powering their respective Safeguards Buses. -No other equipment was previously out of service. Per Tech Spec LCO 3.8.1, which of the following COMPLETION TIMES would apply to restore one required offsite circuit to OPERABLE status? Restore one required offsite circuit to OPERABLE status within...
Answer
  • A. 2 hours
  • B. 12 hours
  • C. 24 hours
  • D. 72 hours

Question 43

Question
Which of the following flowpaths correctly describes how power is normally supplied to a typical Unit 2 vital instrument bus (e.g. 2EC1)?
Answer
  • A. 480 VAC from safeguards bus, rectified to 125 VDC by a Battery Charger, DC Bus, inverted to 118 VAC, and supplied to instrument bus.
  • B. 480 VAC from safeguards bus, transformed to 118 VAC, and supplied to the instrument bus.
  • C. 480 VAC from safeguards bus, inverted to 118 VAC by battery charger, supplied to battery bus, and supplied to instrument bus.
  • D. 125 VDC from battery, stepped down to 118 VDC, and supplied to instrument bus.

Question 44

Question
Which of the following flowpaths correctly describes how power is NORMALLY supplied to a typical Unit 1 vital instrument bus (e.g. 1EC1)?
Answer
  • A. Safeguards 480 VAC -> Battery Charger -> 1E 125 VDC Bus -> Inverter -> Instrument Bus
  • B. Safeguards 480 VAC -> Battery Charger -> Transformer -> Inverter -> Instrument Bus
  • C. 1E 125 VDC Bus -> Battery Charger -> Inverter -> Instrument Bus
  • D. Safeguards 480 VAC -> Inverter -> Battery Charger -> Instrument Bus

Question 45

Question
The normal power supplies for the Protection Inverter IV1PC1 through IV1PC4 are...
Answer
  • A. class 1E 480 V buses.
  • B. class 1E 125 V DC buses.
  • C. non-class 1E 480 volt buses.
  • D. non-class 1E 125 V DC buses.

Question 46

Question
With 118 VAC Inverter IV2EC2 supplying 118 VAC Vital Distribution Panel 2EC2 in a normal alignment, the following indications are noted: -INVERTER SUPPLYING LOAD yellow light ON -BYPASS SOURCE SUPPLYING LOAD red light OFF -IN SYNC yellow light OFF A fault occurs which causes the inverter DC input breaker to trip open. Assuming NO operator action(s), which of the following describes the expected status of 118 VAC Vital Distribution Panel 2EC2?
Answer
  • A. 2EC2 is being powered from Inverter IV2EC2
  • B. 2EC2 is being powered from bypass power
  • C. 2EC2 is being powered from the swing inverter
  • D. 2EC2 is de-energized

Question 47

Question
Given the following condition: -Inverter 1PC4 has been declared inoperable due to an internal failure. Which of the following alignments would be acceptable to allow Unit 1 to continue to operate in MODE 1 for the next several weeks while parts are procured for repairs to Inverter 1PC4? Align 118 VAC __________ to 118 VAC Vital Distribution Panel 1PC4.
Answer
  • A. Distribution Panel 1EC6.
  • B. Distribution Panel 1EC5.
  • C. Inverter IV1EC2/4.
  • D. Inverter IV1EC1/3.

Question 48

Question
Installed Spare Inverter IV1EC2/4 is properly aligned, supplying inverted power to Bus 1PC4, when a fault deenergizes DC Bus 1ED2. The installed spare inverter will...
Answer
  • A. continue to supply inverted power to Bus 1PC4.
  • B. lose output, deenergizing Bus 1PC4.
  • C. auto transfer to supply bus loads from Bus 1EC2.
  • D. auto transfer bus loads to Inverter IV1PC4.

Question 49

Question
The Main Control Room normal lighting for each unit's horseshoe area is supplied power during normal plant operations from...
Answer
  • A. a non-safeguards battery.
  • B. a safeguards battery.
  • C. a safeguards 480 V MCC via a lighting transformer.
  • D. an inverter which is supplied by a non-safeguards battery.

Question 50

Question
Given the following conditions: -The unit is at 100% power. -Power has been lost to 1PC3, Protection Bus III, and actions are being taken in accordance with ABN-603, Loss of Protection or Instrument Bus. -PT-936, Containment Pressure Channel II, then fails high. Which of the following describes the effect on the: 1) Safety Injection (SI) system; and, 2) Containment Spray (CS) system?
Answer
  • A. 1) An SI would NOT occur. 2) A CS actuation would NOT occur.
  • B. 1) An SI would occur. 2) A CS actuation would NOT occur.
  • C. 1) An SI would NOT occur. 2) A CS actuation would occur.
  • D. 1) An SI would occur. 2) A CS actuation would occur.

Question 51

Question
Given the following conditions: -The Unit is in MODE 6. -Core Alterations are in progress. -The Gamma Metrics Monitoring System is tagged out for maintenance. -1-ALB-10B, 1.16, 118V CHAN I INV TRBL alarm is locked in. -1-LI-930, RWST level indicates zero (0) %. -1-NI-31, Source Range instrument is indicating zero (0) cpm. -1-PI-0405, RCS pressure indicates zero (0) psig. In accordance with Technical Specifications, which of the following describes the ACTION required?
Answer
  • A. Immediately suspend Core Alterations and operations that would cause introduction of coolant into the RCS with boron concentration less than that required for refueling operations specified in the COLR.
  • B. Core Alterations and operations that would cause introduction of coolant into the RCS with boron concentration less than that required for refueling operations specified in the COLR may continue if the Source Range Audio Count Rate is selected to an OPERABLE channel.
  • C. Core Alterations may continue. Operations that would cause introduction of coolant into the RCS with boron concentration less than that required for refueling operations specified in the COLR are prohibited.
  • D. Immediately suspend Core Alterations. Ensure at least 1 Source Range NI is OPERABLE prior to performing operations that would cause introduction of coolant into the RCS with boron concentration less than that required for refueling operations specified in the COLR.

Question 52

Question
Given the following conditions with Unit 1 operating at 100% power: -A loss of 1EC1, Instrument Bus occurred due to a fault on the supply breaker to IV1EC1, Inverter. -1EC1, Instrument Bus is currently powered from the Alternate Source, 1EC3, Instrument Bus. Which of the following: Identifies the most restrictive Technical Specification Limiting Condition for Operation? Describes the REQUIRED ACTION?
Answer
  • A. The Instrument Bus Inverter is INOPERABLE. Restore Instrument Bus power to normal in 24 hours.
  • B. The Instrument Bus Inverter is INOPERABLE. Restore Instrument Bus power to normal within 72 hours.
  • C. Diesel Generator 1-01 and its Blackout Sequencer are INOPERABLE because of loss of IV1EC1, Inverter. Restore Diesel Generator 1-01 operability within 24 hours.
  • D. Diesel Generator 1-01 and its Blackout Sequencer are INOPERABLE because of loss of IV1EC1, Inverter. Restore Diesel Generator 1-01 operability within 72 hours.

Question 53

Question
Given the following conditions: -Unit 1 is at full power. -A loss of Vital 120 VAC bus 1EC2 occurs. -Troubleshooting is in progress bus the bus is unable to be re-energized. How long before the Unit must be in MODE 3?
Answer
  • A. 2 hours.
  • B. 6 hours.
  • C. 8 hours.
  • D. 30 hours.

Question 54

Question
Given the following conditions at 100% power on Unit 1: -Unit 1 transferred Instrument Bus 1EC2 to the Alternate Power Supply due to a problem with Inverter IV1EC2. -No other equipment was previously out of service. Which of the following Technical Specification actions would apply and provide the most limiting time before requiring entry into MODE 3? Technical Specification Limiting Condition for Operation...
Answer
  • A. 3.8.1, AC Sources - Operating, CONDITION B: One DG inoperable.
  • B. 3.8.1, AC Sources - Operating, CONDITION I: One Blackout Sequencer inoperable.
  • C. 3.8.7, Inverters - Operating, CONDITION A: One required inverter inoperable.
  • D. 3.8.9, Distribution Systems - Operating, CONDITION B: One AC vital bus subsystem inoperable.

Question 55

Question
If instrument bus 1EC1 is lost while in MODE 6, all operations involving CORE ALTERATIONS, positive reactivity changes, or movement of irradiated fuel are suspended until...
Answer
  • A. permission is obtained from Station Nuclear Engineering.
  • B. the redundant train is properly energized.
  • C. temporary monitoring instrumentation is installed.
  • D. the shutdown margin is verified adequate.

Question 56

Question
Given the following conditions: -Power is currently at 32% during a plant startup. -Protection Bus 1PC4 deenergized as a result of a fault. -Protection Bus 1PC4 will be deenergized for approximately four (4) hours while repairs are being made. In order to put the plant in a safe condition ...
Answer
  • A. place all 7300 Process Protection Cabinet IV Reactor Trip instruments in the tripped condition in accordance with the individual instrument ABNs.
  • B. place all 7300 Process Protection Cabinet IV Engineered Safeguards Function instruments in the tripped condition in accordance with the individual instrument ABNs
  • C. place all Main Feedwater Control Valves in MANUAL in accordance with ABN-603, Loss of Protection or Instrument Bus.
  • D. initiate a plant shutdown in accordance with IPO-003A, Power Operations.

Question 57

Question
A continuous float charge is maintained on the DC system batteries to...
Answer
  • A. prevent electrolyte evaporation.
  • B. minimize the effects of electrical grounds.
  • C. maintain battery at the required capacity condition.
  • D. equalize the voltage of each cell of the battery.

Question 58

Question
Following a loss of all AC power, how long are the safety-related 125 VDC batteries DESIGNED to allow equipment operation?
Answer
  • A. 2 hours, assuming that all non-essential loads are shed from the associated DC bus
  • B. 2 hours, assuming all loads remain aligned to the associated DC bus
  • C. 4 hours, assuming that all non-essential loads are shed from the associated DC bus
  • D. 4 hours, assuming all loads remain aligned to the associated DC bus

Question 59

Question
Given the following conditions: -Unit 1 is at 100% power with all systems in their normal alignment. -ALB-10B, 1.13, 125 VDC SWITCH PNL 1ED1 TRBL, is alarming. -V-1ED1, 125 VDC SWITCH PNL 1ED1 VOLT, is indicating 135 volts. -When the GROUND TEST switch at Panel 1ED1 is placed in "TEST", both the NEGATIVE-GND and POSITIVE-GND white lights are lit. -The POSITIVE-GND white light is brighter and the NEGATIVE-GND white light is dimmer. Which of the following is the cause of the trouble alarm on 125 VDC Panel 1ED1, and the component supplying power to Panel 1ED1?
Answer
  • A. A POSITIVE ground exists and the BATTERY is supplying the bus.
  • B. A POSITIVE ground exists and the BATTERY CHARGER is supplying the bus.
  • C. A NEGATIVE ground exists and the BATTERY is supplying the bus.
  • D. A NEGATIVE ground exists and the BATTERY CHARGER is supplying the bus.

Question 60

Question
Unit 1 just completed a major outage on bus 1D1, its associated batteries, and battery chargers. The associated bus, batteries, and battery chargers are ready to be returned to service and support plant start-up. Which of the following could delay the batteries' return to full voltage?
Answer
  • A. The input current limiters in the chargers are set conservatively too low.
  • B. Turbine seal oil pumps draw a large amount of current from 1D1
  • C. The output current limiters in the chargers are set conservatively too low.
  • D. Battery room ambient temperature has reached 72°F.

Question 61

Question
250 VDC Bus 1D2 is being powered by Batteries BT1D2 and BT1D4 while supplying the following loads: -SG Feed Pu,mp Emergency Oil Pumps 1-01 and 1-02 (30 Amps each) -Main Turbine Emergency Oil Pump (60 Amps) -DC Seal Oil Pump (30 Amps) Assuming that these are the only loads on the DC bus, how long will the battery system last if the combined rating of the batteries is 1200 ampere-hours?
Answer
  • A. 6 hours
  • B. 8 hours
  • C. 10 hours
  • D. 12 hours

Question 62

Question
Given the following conditions on Unit 1: -The Unit is operating at 100% power. -No Safety related equipment is out of service. -480 VAC 1E Bus 1EB1 has been lost due to an electrical fault. Which of the following describes the status of the Train A Batteries?
Answer
  • A. One of the two Battery Chargers connected to each of the Battery Buses 1ED1 and 1ED3 were lost. Batteries BT1ED1 and BT1ED3 remain on Float Charge.
  • B. Two Chargers were lost to DC Bus 1ED1. Battery BT1ED1 is discharging and Battery BT1ED3 remains on Float Charge.
  • C. One of two Battery Chargers available to Battery Buses 1ED1 and 1ED3 were lost but the standby Battery Charger breaker automatically closed. Batteries BT1ED1 and BT1ED3 remain on Float Charge.
  • D. One of two Battery Chargers available to each of the Battery Buses 1ED1 and 1ED3 were lost. If the Battery Chargers were in service then the associated battery will be discharging.

Question 63

Question
Given the following conditions: -ALB-10B, 1.13, 125V SWITCH PNL 1ED1 TRBL, is alarming. -All other alarms are clear. -A-BT1ED, BATT BT1ED1 CURRENT, is indicating (–) 10 amps. -V-1ED1, 125 VDC SWITCH PNL 1ED1 VOLT, is indicating 130 volts. -A Nuclear Equipment Operator (NEO) reports that 125 VDC BATTERY CHARGER BC1ED1-1 is aligned in the “Float” mode with a DC VOLTS indication of 134 volts. -The NEO also reports that when the GROUND TEST switch at Panel 1ED1 is placed in “Test”, both the NEGATIVE-GND and POSITIVE-GND white lights are lit, with the NEGATIVE-GND white light slightly brighter than the POSITIVE-GND white light. Which of the following is the cause of the trouble alarm on 125 VDC Panel 1ED1?
Answer
  • A. An undervoltage condition on the panel
  • B. An overvoltage condition from the battery charger
  • C. A ground condition on the negative terminal of the panel
  • D. A ground condition on the positive terminal of the panel

Question 64

Question
Which of the following identifies the types of trips or protective isolation circuits associated with the DC Distribution Panels?
Answer
  • A. Overcurrent only.
  • B. Ground fault only.
  • C. Overcurrent and undervoltage only.
  • D. Overvoltage, ground fault, and undervoltage.

Question 65

Question
A ground condition on a safety-related DC bus would be indicated by...
Answer
  • A. placing the ground test switch in TEST and cycling through all the loads until the amp meter indicates NO pulses.
  • B. the ground detection lights cycling on and off at different frequencies.
  • C. the negative and positive white lights both illuminating with the same intensity.
  • D. either the positive or negative light being dimmer than the other with the ground test switch in TEST.

Question 66

Question
The operation of battery chargers BC1ED1-1 and BC1ED1-2 in parallel is prevented by...
Answer
  • A. an electrical interlock that opens the offgoing charger output breaker when the oncoming charger output breaker is closed.
  • B. a mechanical interlock consisting of a sliding bar between the circuit breakers connecting the battery chargers to the DC bus.
  • C. the physical arrangement of the DC Distribution System preventing connecting these chargers to the same bus.
  • D. an electrical interlock that opens the offgoing charger input breaker when the oncoming charger input breaker is closed.

Question 67

Question
Which of the following identifies how the 125/250 VDC Common Non-Safeguards DC Distribution Panels are prevented from being supplied by both Units during transfer operations?
Answer
  • A. Closing the incoming feeder breaker sends a trip signal to the off going feeder breaker.
  • B. A selector switch only allows the selection of one feeder breaker at a time.
  • C. A mechanical slide bar prevents closing both feeder breakers at the same time.
  • D. Electrical contacts prevent closing both feeder breakers simultaneously.

Question 68

Question
Given the following conditions: -Unit 1 is operating at 100%. -Battery 1ED1 is in EQUALIZE on 125 VDC BATTERY CHARGER BC1ED1-1. -Battery Room Exhaust Fan 7 is running with Battery Room Exhaust Fan 8 in standby. -Annunciator 1-ALB-11B, Window 4.2 – ANY BATT RM EXH FN TRIP goes into alarm. -The Reactor Operator reports that Battery Room Exhaust Fan 7 is tripped and Battery Room Exhaust Fan 8 did not AUTO start and will not manually start. Which of the following describes the impact on the Battery Room due to no exhaust fan running? The battery should be placed in what condition? An exhaust fan running is required...
Answer
  • A. by Technical Specifications to maintain battery room temperature. The battery should be placed in FLOAT.
  • B. to minimize the buildup of hydrogen gas in the battery rooms. The battery should be placed in FLOAT.
  • C. to minimize the buildup of hydrogen gas in the battery rooms. The battery may remain in EQUALIZE.
  • D. by Technical Specifications to maintain battery room temperature. The battery may remain in EQUALIZE.

Question 69

Question
Given the following conditions: -Unit 2 is at 100% power. -Annunciator 2-ALB-10B, Window 1.13 - 125VDC SWITCH PNL 2ED1 TRBL, is in alarm. -SOP-605B, 125 VDC Switchgear and Distribution Systems, Batteries and Battery Chargers, was used to restore power to the affected DC Bus. Which of the following can be used to determine that a loss of DC power had occurred and what DC bus voltage will verify that substitute power sources have been energized?
Answer
  • A. The Turbine Driven Auxiliary Feedwater Pump is running. Panel board voltage is at least 105 VDC on 2ED1.
  • B. Train B Switchgear Trip and Close power is lost. Panel board voltage is at least 105 VDC on 2ED1.
  • C. The Turbine Driven Auxiliary Feedwater Pump is running. Panel board voltage is at least 128 VDC on 2ED1.
  • D. Train B Switchgear Trip and Close power is lost. Panel board voltage is at least 128 VDC on 2ED1.

Question 70

Question
Given the following conditions of Unit 1 DC Safeguards Bus voltage: -DC Bus 1ED1 is at 135 volts and 1 amps CHARGE. -DC Bus 1ED2 is at 134 volts and 2 amps CHARGE. -DC Bus 1ED3 is at 135 volts and 1 amp CHARGE. -DC Bus 1ED4 is at 134 volts and 2 amps CHARGE. After a plant transient the following is observed: -DC Bus 1ED1 is at 134 volts and 2 amps CHARGE. -DC Bus 1ED2 is at 123 volts and 188 amps DISCHARGE. -DC Bus 1ED3 is at 134 volts and 1 amp CHARGE. -DC Bus 1ED4 is at 124 volts and 190 amps DISCHARGE. Which of the following events has caused the change in DC Safeguards Bus voltage? A loss of...
Answer
  • A. Motor Control Center XEB1-1.
  • B. Safeguards Bus 1EA1.
  • C. Motor Control Center XEB2-1.
  • D. Safeguards Bus 1EA2.

Question 71

Question
Which of the following would be the most probable cause of a 1-ALB-10B, Window 1.9 - 125 VDC SWITCH PNL 1ED3 TRBL alarm with associated 1-SSII-1 Train AA, Window 2.7 - 125 VDC alarm? Bus 1ED3...
Answer
  • A. overvoltage
  • B. undervoltage
  • C. overcurrent
  • D. undercurrent

Question 72

Question
Given the following conditions: -Unit 2 is operating at 100% power. -All systems are in a normal alignment. -125 VDC Bus 2ED2 deenergizes. Which of the following describes the effect of this loss of power on Technical Specification required equipment?
Answer
  • A. 2/1-8152, LTDN CNTMT ISOL VLV, will NOT be capable of being shut, requiring implementation of Containment Isolation Technical Specifications
  • B. Protection Bus 2PC2 loses power, requiring implementation of the Power Distribution Technical Specification requirements
  • C. SG ARVs 2-02 and 2-04 will NOT be capable of being operated from the Control Room, requiring SG ARV Technical Specification implementation
  • D. RCPs lose tripping capability, requiring RCS Technical Specification implementation

Question 73

Question
Given the following indications on Unit 1 DC Safeguards Switch Panels (Buses) and Batteries: -DC Switch Panel 1ED1 is at 135 volts with battery BT1ED1 at 2 amp CHARGE. -DC Switch Panel 1ED2 is at 136 volts with battery BT1ED2 at 2 amp CHARGE. -DC Switch Panel 1ED3 is at 135 volts with battery BT1ED3 at 1 amp CHARGE. -DC Switch Panel 1ED4 is at 140 volts with battery BT1ED4 at 10 amp CHARGE. Which of the following lists the status of the Unit 1 DC Safeguards batteries? (BT1ED1, BT1ED2, BT1ED3, BT1ED4)
Answer
  • A. FLOAT, EQUALIZE, FLOAT, EQUALIZE
  • B. EQUALIZE, FLOAT, EQUALIZE, FLOAT
  • C. EQUALIZE, EQUALIZE, EQUALIZE, FLOAT
  • D. FLOAT, FLOAT, FLOAT, EQUALIZE

Question 74

Question
Given the following conditions: -Unit 1 was operating at 100% power. -Centrifugal Charging Pump (CCP) 1-01 was running. -A loss of 125 VDC Bus 1ED1 has occurred. -While stabilizing the unit, a spurious SI occurred resulting in a start signal being sent to both CCP 1-01 and Safety Injection Pump (SIP) 1-01, as well as other pieces of equipment. Concerning only CCP 1-01 and SIP 1-01, which of the following pump combinations will exist as a result of these failures?
Answer
  • A. CCP 1-01 running, SIP 1-01 running
  • B. CCP 1-01 NOT running, SIP 1-01 running
  • C. CCP 1-01 running, SIP 1-01 NOT running
  • D. CCP 1-01 NOT running, SIP 1-01 NOT running

Question 75

Question
Which of the following would be the response of the Train A Diesel Generator (DG) upon loss of Train A 125 VDC power?
Answer
  • A. DG would NOT start on receipt of an emergency start signal, but would start on a normal start signal.
  • B. DG would NOT start on receipt of an emergency start signal, nor a normal start signal.
  • C. DG would start on either an emergency start or normal start signal, but would NOT be able to close the output breaker.
  • D. DG would NOT start on receipt of a normal start signal, but would start on an emergency start signal.

Question 76

Question
Given the following conditions: -Unit 1 is operating at 75% power. -Annunciator 1-ALB-10B, Window 1.14 - BATT CHRG BC 1ED1-1/BC 1ED1- TRBL is in alarm. -1ED1 Bus voltage is 120 VDC. -Switchboard Feeder Breaker, 1ED1/2-9/BKR for Battery Charger BC 1ED1-2 is open and damaged. Which of the following is an appropriate action assuming no other faults or damage?
Answer
  • A. Restore Battery Charger BC 1ED1-2 within 2 hours.
  • B. Place BC 1ED1-1 in service and initiate repairs to Breaker 1ED1/2-9/BKR.
  • C. Ensure DC power supply to Train B Steam Dump Solenoid Valves.
  • D. Load shed SWBD 1ED1 to ensure Safeguard Switchgear TRIP & CLOSE function.

Question 77

Question
Given the following conditions: -Unit 1 is operating at 100% power with all systems in normal alignment. -1ED1/1-1/DSW, 125 VDC STATION BATTERY BT1ED1 DISCONNECT SWITCH, was placed in OFF. Which of the following would provide the Control Room with indication of this condition?
Answer
  • A. Low Bus Voltage indicated on DC Bus 1ED1 voltmeter on CB-11.
  • B. SSII Train A alarms for SSW, ECCS, CS, MDAFW, DG PWR, SFTY CH WTR, CR HVAC, CCW and RHR.
  • C. High amperage on Battery BT1ED1 ammeter on CB-11
  • D. SSII Train B alarms for SSW, ECCS, CS, MDAFW, DG PWR, SFTY CH WTR, CR HVAC, CCW and RHR.

Question 78

Question
Given that a bus fault has caused 125/250 VDC Electrical Distribution Bus 1D3 to deenergize. Which of the following is an effect of the loss of DC power?
Answer
  • A. Main Turbine Generator EHC Pump breaker position is NOT available in the Control Room and an Operator must locally trip the breakers, if required.
  • B. Train B Reactor Trip Breaker position is available in the Control Room, but the shunt trip of the breaker is NOT available either from the Control Room or locally.
  • C. Main Feed Pump B Controller position is available in the Control Room, but the electrical trip of the pump is NOT available either from the Control Room or locally.
  • D. Reactor Coolant Pump breaker position is NOT available in the Control Room and an Operator must locally trip the breakers, if required.

Question 79

Question
Given the following conditions: -Unit 1 is at 2% power -MDAFWPs 1-01 and 1-02 are supplying feedwater to the SGs -Bus 1ED1, 125 VDC power fails to MDAFWP 1-01 breaker Which of the following describes how the loss of DC control power affects the 1-01 MDAFWP breaker? MDAFWP 1-01 breaker will ...
Answer
  • A. trip, and CANNOT be closed from the MCB.
  • B. trip, but can be reclosed from the MCB.
  • C. remain closed, but can be tripped from the MCB.
  • D. remain closed and CANNOT be tripped from the MCB.

Question 80

Question
Given the following conditions of Unit 1 DC Safeguards Bus voltage: -DC Bus 1ED1 is at 134 volts and 2 amps CHARGE. -DC Bus 1ED2 is at 135 volts and 1 amp CHARGE. -DC Bus 1ED3 is at 135 volts and 1 amp CHARGE. -DC Bus 1ED4 is at 134 volts and 2 amps CHARGE. After a plant transient the following is observed: -DC Bus 1ED1 is at 123 volts and 190 amps DISCHARGE. -DC Bus 1ED2 is at 134 volts and 2 amps CHARGE. -DC Bus 1ED3 is at 124 volts and 70 amps DISCHARGE. -DC Bus 1ED4 is at 135 volts and 1 amp CHARGE. Which of the following events has caused the change in DC Safeguards Bus voltage? A loss of...
Answer
  • A. Motor Control Center XEB1-1.
  • B. Safeguards Bus 1EA1.
  • C. Motor Control Center XEB2-1.
  • D. Safeguards Bus 1EA2.

Question 81

Question
Given the following conditions: -Battery BT-1ED1 is discharging during a Loss of All AC Power Assuming the load on Train A Safeguards DC Bus 1ED1 does NOT change which of the following statements correctly describes Battery BT-1ED1 discharge rate (amps) as the battery is expended? As Battery BT-1ED1 voltage lowers, the discharge rate in amps will...
Answer
  • A. increase until the design battery capacity is exhausted.
  • B. be fairly constant until the design battery capacity (amp-hours) is exhausted and then will rapidly decrease.
  • C. decrease until the design battery capacity is exhausted.
  • D. initially decrease until approximately 50% design capacity had been expended and then increase until the battery has been exhausted.

Question 82

Question
Given that a bus fault has caused 125/250 VDC Electrical Distribution Bus 1D2 to deenergize, which of the following plant components will be directly affected by the loss of DC power?
Answer
  • A. Main Turbine Extended Turbine Protection (ETP) is not available.
  • B. Main Generator control is lost due to loss of the EHC control power.
  • C. Train B Reactor trip and Bypass breakers cannot shunt trip.
  • D. Main Feedwater Pumps cannot process any electrical trips.

Question 83

Question
Given the following conditions on Unit 1: -The Unit is operating at 100% power. -No Safety related equipment is out of service. -480 VAC 1E Bus 1EB1 has been lost due to an electrical fault. Which of the following describes the status of the Train A Batteries and what Technical Specification is impacted?
Answer
  • A. One of the two Battery Chargers connected to each of the Battery Buses 1ED1 and 1ED3 were lost. Batteries BT1ED1 and BT1ED3 remain on Float Charge. Technical Specification LCO 3.8.4, DC Sources-Operating.
  • B. Two Chargers were lost to DC Bus 1ED1. Battery BT1ED1 is discharging and Battery BT1ED3 remains on Float Charge. Technical Specification LCO 3.8.6, Battery Parameters.
  • C. One of two Battery Chargers available to Battery Buses 1ED1 and 1ED3 were lost but the standby Battery Charger breaker automatically closed. Batteries BT1ED1 and BT1ED3 remain on Float Charge. Technical Specification LCO 3.8.6, Battery Parameters.
  • D. One of two Battery Chargers available to each of the Battery Buses 1ED1 and 1ED3 were lost. If the Battery Chargers were in service then the associated battery will be discharging. Technical Specification LCO 3.8.4, DC Sources-Operating.

Question 84

Question
In order to transition from MODE 5 to MODE 4, what are the required OPERABLE DC electrical sources?
Answer
  • A. Both Train A & both Train B 125V 1E batteries ONLY
  • B. Both Train A & both Train B 125V 1E batteries and one full capacity battery charger for each battery ONLY
  • C. ALL 1E 125V batteries and ALL full capacity battery chargers for both A & B trains
  • D. Both Train A & both Train B 125V 1E batteries and one full capacity battery charger per train ONLY

Question 85

Question
With Unit 1 in MODE 3 and Battery Charger BC1ED1-2 inoperable, which of the following would require entry into Tech Spec 3.8.4, "DC Sources - Operating," action statements?
Answer
  • A. Battery Charger BC1ED1-1 "EQUALIZE" push button is depressed
  • B. Battery BT1ED2 voltage is 125 VDC
  • C. Battery BT1ED3 float current is 0 amps
  • D. Battery Charger BC1ED4-1 is placed under clearance after placing Battery Charger BC1ED4-2 in service

Question 86

Question
With Unit 1 in MODE 5, which of the following describes a condition that would place the unit in a Technical Specification 3.8.10, DISTRIBUTION SYSTEMS - SHUTDOWN, ACTION statement?
Answer
  • A. 24/48 V switchboard 1D1 is de-energized
  • B. 125 V 1E station batteries BT1ED1 and BT1ED2 are inoperable
  • C. Non-class 1E 125 V bus 1D3 is de-energized
  • D. Train "B" 125 V 1E bus 1ED2 is de-energized

Question 87

Question
Given the following conditions: -Unit 1 is in MODE 6 with core reload in progress. -Train B safeguards batteries BT1ED2 and BT1ED4 are tagged out for replacement. -A short circuit develops rendering safeguards battery BT1ED3 inoperable. Which of the following Technical Specification actions are required? 1. Initiate action to restore BT1ED3 to OPERABLE within 1 hour. 2. Initiate action to restore BT1ED3 to OPERABLE Immediately. 3. Initiate action to restore IV1PC3 and IV1EC5 to OPERABLE within 1 hour. 4. Initiate action to restore IV1PC3 and IV1EC5 to OPERABLE Immediately. 5. Initiate action to restore safeguards bus1ED3 to OPERABLE within 1 hour. 6. Initiate action to restore safeguards bus1ED3 to OPERABLE Immediately.
Answer
  • A. 1, 3, 5
  • B. 2, 4, 6
  • C. 1, 3, 6
  • D. 2, 4, 5
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