Electrical

Card Set Information

Author:
heidin
ID:
156300
Filename:
Electrical
Updated:
2012-05-30 17:40:18
Tags:
Electrical ILC
Folders:

Description:
questions
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user heidin on FreezingBlue Flashcards. What would you like to do?


  1. Unit Two is at rated power with the normal electrical distribution lineup. A fault on Line 31 initiates a trip signal to PCBs 31A and 31B. PCB 31B trips open as designed. PCB 31A fails to trip resulting in actuation of the breaker failure lockout relay for PCB 31A.

    How will this event affect off-site power availability?

    A. 230 KV Bus 2A only is energized and the SAT is energized.
    B. 230 KV Bus 2B only is energized and the SAT is energized.
    C. 230 KV Bus 2A and 2B are both energized and the SAT is energized.
    D. 230 KV Bus 2A and 2B are both de-energized and the SAT is de-energized.
    B. 230 KV Bus 2B only is energized and the SAT is energized.


    The breaker failure circuit for PCB 31A will initiate a 230 KV Bus 2A lockout (primary and backup). PCBs 26A, 27A, 2BA, 29A and 30A all trip de-energizing 230 KV Bus A. This leaves 230 KV Bus 2B energized and providing power to the SAT through PCB 26B.
  2. Unit Two is at rated power with the normal electrical distribution lineup. A fault on the SAT results in a SAT lockout relay actuation and a loss of 4KV Bus 2B. The operator performs all required immediate operator actions.

    What is the status of Unit Two electrical distribution?

    A. All Emergency Buses are powered from the BOP Buses, all four DGs remain in standby.
    B. All Emergency Buses are powered from the BOP Buses, all four DGs are running unloaded.
    C. Buses E3 & E4 are powered from DGs, neither 230 KV bus is energized and available to establish UAT backfeed.
    D. Buses E3 & E4 are powered from DGs, both 230 KV buses are energized and available to establish UAT backfeed.
    D. Buses E3 & E4 are powered from DGs, both 230 KV buses are energized and available to establish UAT backfeed.


    When the SAT trips, all DGs receive an auto start signal from SAT L/O and SAT UV. Bus 2B trips resulting in loss of Recirc Pumps requiring immediate operator action to insert a scram. BOP Buses and E Buses remain energized from the UAT until the operator takes immediate scram actions and trips the main turbine. With UAT and SAT both de-energized, BOP buses drop and DGs pick up E Buses. Since PCBs 26A & B have been installed, these PCBs trip on SAT L/O and maintain both 230 KV Buses energized and available for backfeed.
  3. Which one of the following conditions must be met before PCB 26B can be closed to energize the Transformer Bus?


    A. 89-ST2 must be open and all SAT Feeder Breakers are open
    B. Breaker Failure Lockout must be reset for PCB 26A
    C. PCB is selected for LOCAL at Relay House
    D. 89-T2 and 89-ST2 must be open
    B. Breaker Failure Lockout must be reset for PCB 26A
  4. Unit 1 and Unit 2 are both at 100% power with BOP Bus Common A being fed from BOP Bus Common B.

    The Unit 2 Control Operator is performing shift surveillances per 2OI-03.2, Control Operator Daily Surveillance Report. The following 4160 VAC bus amperages are obtained from the PPC:

    Point U2ED_C468: 3555 amps
    Point U2ED_E008: 1565 amps
    Point U2ED_E013: 1550 amps
    Point U2ED_ U2ED_E008 and E013: 440 amps

    Using 2OI-03.2, determine the effect on plant operations.


    A. Both off-site power sources are OPERABLE due to the combined amperages of Bus 2C & Bus 2D being below the operating limit.

    B. Both off-site power sources are OPERABLE due to the combined amperages of Bus 2C, Bus 2D, & Common B being below the operating limit.

    C. Both off-site power sources must be declared INOPERABLE due to the combined amperages of Bus 2C & Bus 2D being above the operating limit.

    D. Both off-site power sources must be declared INOPERABLE due to the combined amperages of Bus 2C, Bus 2D, & Common B being above the operating limit.
    D. Both off-site power sources must be declared INOPERABLE due to the combined amperages of Bus 2C, Bus 2D, & Common B being above the operating limit.
  5. Unit One (1) has experienced a Loss of Offsite Power (LOOP). EDG #2 has tripped and 4160V Bus E2 is locked out. The following actions to cross-tie 480V buses E5 and E6 are complete.

    Both 480V cross-tie breakers are racked in.
    Bus E2 to Sub E6 4160V Supply Breaker (AH1) has been tripped.
    Sub E6 480V Main Breaker (AV4) has been tripped.

    When the CO places and holds the Unit One (1) control switch for BUS E5 TIE TO BUS E6 cross-tie breakers in the CLOSE position:


    A. Only the E5 (AT4) cross-tie breaker will close
    B. Only the E6 (AX1) cross-tie breaker will close
    C. Both the E5 (AT4) and E6 (AX1) cross-tie breakers will close
    D. Neither cross-tie breaker will close
    C. Both the E5 (AT4) and E6 (AX1) cross-tie breakers will close


    • Both breakers meet permissives and will close.
    • -Rack in cross-tie breakers √
    • -Open Main Breaker √
    • -Open Supply breaker √
    • -Close cross-tie breakers √
  6. Unit Two (2) is in Mode 1 when a malfunction in 125 VDC Distribution Panel 2B results in a loss of control power to 480 VAC Bus E8.

    Assuming DC control power has not been placed on the alternate supply, which one of the following describes the response of breaker 'Sub E8 480V Main Breaker' (AZ5) to this malfunction?

    Breaker AZ5:


    A. Can be operated remotely and will trip on overcurrent
    B. Cannot be operated remotely but will trip on overcurrent
    C. Can be operated remotely but will not trip on overcurrent
    D. Cannot be operated remotely and will not trip on overcurrent
    B. Cannot be operated remotely but will trip on overcurrent


    • Loss of 125 VDC control power to an Emergency 480 substation:
    • · Alternate 125 VDC source is available (manual transfer)
    • · Inability to operate breaker from RTGB or Local
    • · No remote position indication
    • · Loss of automatic trips
    • · Breaker will still trip on overcurrent conditions
  7. Unit Two (2) is in MODE 1 with all equipment OPERABLE. Substation E8 trips on fault resulting in loss of power to Standby Gas Treatment (SGT) subsystem 2B. LCO 3.8.7 Condition B is entered for Substation E8.

    Per Technical Specifications, SGT subsystem 2B is currently:


    A. INOPERABLE. Entry into LCO 3.6.4.3 Condition A is immediately required.
    B. OPERABLE. LCO 3.8.7 Condition B is limiting, therefore supported systems are not required to be declared INOPERABLE.
    C. INOPERABLE. Entry into LCO 3.6.4.3 Condition A is NOT required provided it is determined that no loss of safety function exist.
    D. OPERABLE. SGT 2B must be declared INOPERABLE once the 8 hour restoration time for E8 per LCO 3.8.7 Condition B has expired.
    • B. OPERABLE. LCO 3.8.7 Condition B is limiting, therefore supported systems are not required to be declared INOPERABLE.

    (I think; TS 3.0.6.) ??
  8. Unit 2 is in a station blackout. No electrical buses have been cross-tied. Assuming normal alignment of UPS prior to the station blackout, the UPS Primary inverter is currently being fed from DC Switchboard:

    A. If the primary inverter fails, UPS will auto transfer to the standby unit.
    B. If the primary inverter fails, UPS will auto transfer to the standby unit.
    C. If the primary inverter fails, UPS must be manually transferred to the standby unit.
    D. If the primary inverter fails, UPS must be manually transferred to the standby unit.
    C. If the primary inverter fails, UPS must be manually transferred to the standby unit.
  9. What effect would a loss of 480V Bus E8 have on Unit 2 UPS system with the UPS system in the normal operational lineup?


    A. Primary UPS inverter 2A is now being powered from its DC source.
    B. Primary UPS inverter is lost and UPS is being supplied by the standby UPS reserve source.
    C. Standby UPS inverter has lost its normal AC supply and has transferred to its reserve AC source.
    D. Standby UPS inverter is being powered by its DC source and the Primary UPS inverter has lost its reserve AC source.
    D. Standby UPS inverter is being powered by its DC source and the Primary UPS inverter has lost its reserve AC source.
  10. During normal operation of UPS, the standby inverter is:

    A. Energized and supplying power to the primary inverter.
    B. Energized and supplying power to the UPS distribution system.
    C. Energized and bypassed with manual bypass switch in BYPASS TEST.
    D. De-energized but will automatically re-energize if the primary inverter fails.
    C. Energized and bypassed with manual bypass switch in BYPASS TEST.
  11. Which one of the following statements is correct with respect to the purpose of the UPS Synchronizer Monitor?

    A. Ensures the rectifier output is synchronized with the inverter output.
    B. Ensures the UPS output is synchronized with the present supply to the vital bus.
    C. Ensures the inverter input is synchronized with the alternate (reference) source.
    D. Ensures the inverter output is synchronized with the alternate (reference) source.
    D. Ensures the inverter output is synchronized with the alternate (reference) source.
  12. Unit Two is at rated power with the UPS System in its normal alignment. Offsite power is subsequently lost to Unit Two. Electric plant status is as follows:

    Diesel Generator 3 Not Available light lit
    Diesel Generator 4 Loaded light lit
    DC Switchboard 2A 250VDC
    DC Switchboard 2B 270VDC

    Unit Two UPS loads are currently:

    A. de-energized.
    B. energized from the primary inverter.
    C. energized from the standby inverter.
    D. energized from the alternate source.
    B. energized from the primary inverter.


    The primary inverter normally feeds UPS via the AC source and rectifier from Div l AC. Div I AC is no longer available since DG3 is tripped. The DC inverter input takes over and supplies the primary inverter input when rectifier output voltage drops below battery input voltage, as long as voltage is above 214. The standby inverter is fully energized from Div II AC and DC but is normally in Bypass Test. The alternate AC source is available from Div II AC in the event the primary inverter fails or DC input voltage drops too low.
  13. Unit Two is operating at rated power with UPS in its normal alignment. Subsequently, off-site power is lost; DG3 and DG4 are unavailable. No electrical buses have been cross-tied.

    Which one of the following choices completes the statements below?

    The UPS Primary Inverter is currently being fed from DC Switchboard ____________.
    If the Primary Inverter fails, _________.


    A. 2A.
    UPS loads will be de-energized.

    B. 2B.
    UPS loads will be de-energized.

    C. 2A.
    UPS will auto transfer to an alternate source.

    D. 2B.
    UPS will auto transfer to an alternate source.
    • A. 2A.
    • UPS loads will be de-energized.


    DC input to primary inverter is from Div I DC (2A). With the STBY unit in Bypass Test (the normal alignment), if the primary inverter fails UPS loads will be de-energized. Multiple UPS lineups are available dependent upon plant condition, making any of the answer options plausible.
  14. The indications and status of the Unit 2 Vital UPS System are as follows:

    Primary Inverter Standby Inverter
    Load on UPS (DS10) ON OFF
    Load on inverter (DS151) ON ON
    Load on alternate OFF OFF
    Alt source failure (DS11) OFF OFF

    There are no alarms on the RTGB.

    What is the status of Unit 2 Vital UPS System Loads?


    A. Loads are being powered from the Primary and Standby Inverters.
    B. Loads are power from the Primary Inverter only.
    C. The Alternate Source (Hard Source) only is powering the loads.
    D. The Standby Inverter only is powering the loads.
    B. Loads are power from the Primary Inverter only.
  15. Unit Two is operating at 30% reactor power when a complete loss of the Vital UPS
    System occurs.

    Which one of the following describes how this loss will affect RFPT operation?


    A. RTGB trip pushbutton function is lost.
    B. overspeed trip circuit will lose power causing RFPT Trip.
    C. vibration instrumentation will lose power causing RFPT Trip.
    D. RFPT woodward control trip circuits will be powered from their redundant power supplies.
    D. RFPT woodward control trip circuits will be powered from their redundant power supplies.


    • RFPT woodward control trip circuits are powered from UPS with redundant power supplies from non-UPS
    • 120VAC supplies (C and D buses). The RFPT trip pushbutton is powered from 125 VDC.
  16. Which one of the following choices completes the statements below regarding how a
    total loss of UPS will affect the Digital Feedwater Level Control System Controllers.

    Level Setpoint adjustment is __________

    Level Setdown ________ occur following a reactor scram.


    A. available;
    will

    B. available;
    will not

    C. not available;
    will

    D. not available;
    will not
    • D. not available;
    • will not


    A Loss of UPS will cause the RFPT controller screens to go blank. The backup OC power supplies will allow continued operation; however, the operator will be unable to adjust level setpoint. Reactor Water level setdown will not occur in the event of a reactor scram.
  17. Unit One (1) is operating at 100% power. A lighting strike occurs which results in a simultaneous Loss of the Uninterruptible Power Supply (UPS) and a Unit One (1) trip. The reactor operator reports the following conditions.

    Reactor water level lowering to +120 inches
    Reactor pressure is 950 psig, controlled by EHC
    Full Core Display control rod Full In lights are not lit
    Digital Feewater Controller displays are blank

    How does the loss of UPS affect the tripped unit?

    A. DFCS immediately sets setpoint setdown to 170 inches.
    B. Reactor power cannot be determined to ve less than 4%.
    C. EHC pressure control will be lost as the turbine coasts down.
    D. Control rod positions must be determined by using the process computer.
    C. EHC pressure control will be lost as the turbine coasts down.
  18. Which one of the following identifies the power supplies for the Electric Driven Fire Pump?

    The normal power supply is from:

    A. E2, with an automatic transfer to E4 on loss of power
    B. E4, with an automatic transfer to E2 on loss of power
    C. E2, must be manually transfered to E4 on loss of power
    D. E4, must be manually transfered to E2 on loss of power
    C. E2, must be manually transfered to E4 on loss of power

What would you like to do?

Home > Flashcards > Print Preview