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EO1 > EO 1 BLOCK 3 EHC > Flashcards

EO 1 BLOCK 3 EHC Flashcards

1
Q

Which one of the following is NOT a purpose of the EHC system?

A. Controls Main Turbine load during power operation.
B. Acts to protect the turbine from unsafe operating conditions.
C. Controls Turbine Bypass Valves when the turbine is TRIPPED.
D. Provides the means for controlling turbine speed and acceleration during start up.

A

C

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2
Q

The ______ system provides high pressure fluid to control the operation of the Main Turbine valves and drains.

A. Stator Cooling
B. T-G Lube Oil
C. Electro-Hydraulic Control
D. Integrated Control System

A

C

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3
Q

The standby Electro-Hydraulic Control(EHC) pump auto START setpoint is ___ psig.

A. 1100
B. 1200
C. 1300
D. 1400

A

C

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4
Q

(Setpoint Required) When in AUTO, two (2) electric heater/fan units are set to come on when EHC fluid temperature decreases to less than:

A. 105 °F
B. 95 °F
C. 85 °F
D. 75 °F

A

C

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5
Q

Which valves associated with the main turbine and supplied by the EHC System, CLOSE on a turbine trip?

A. Turbine Bypass Valves
B. Extraction Steam Non-Return Valves
C. MFPT LP and HP Control Valves
D. Main Stop Valves and Intermediate Stop Valves

A

D

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6
Q

During testing of a Main Turbine Stop Valve, an interlock will prevent testing of the selected Main
Turbine Stop Valve _______ _

A. unless power is less than 90%.
B. unless first stage pressure is >50 psig.
C. if any other MSV test button is depressed.
D. if any other MSV, CV or CIV test button is depressed.

A

C

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7
Q

With the Main Turbine Mechanical Lockout Solenoid valve energized (in LOCKOUT position) __ .

A. the reactor will NOT trip if the turbine trips.
B. the only turbine trip disabled is primary overspeed trip.
C. all turbine trips except for the backup overspeed are disabled.
D. the MANUAL pull trip at the front standard is the only method to trip the turbine.

A

B

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8
Q

Which ONE of the following statements is correct with respect to operation of the Main Turbine
Mechanical Lockout Solenoid valve With the Lockout Solenoid valve energized (in LOCKOUT position) ________?

A. all turbine trips except for backup overspeed are disabled.
B. the only turbine trips disabled are primary overspeed (110%), and the trip button in the control
room.
C. the only turbine trip disabled is primary overspeed (110%).
D. the extraction steam air relay dump valve is prevented from bleeding off actuating air should
the turbine trip.

A

C

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9
Q

The EHC pumps are ______ pumps.

A. variable delivery, positive displacement, piston
B. variable speed, worm gear, centrifugal
C. variable speed, centrifugal, piston
D. variable delivery, worm gear, positive displacement

A

A

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10
Q

Which ONE of the following is correct concerning the operation of an EHC control pack solenoid operated
test valve?

A. Passes 1600 psig hydraulic fluid to the operating cylinder of a non-controlling valve, keeping it
fully OPEN.
B. Positioned by EHC (variable electrical) to provide a variable EHC pressure to a non-controlling
valve’s operating cylinder, controlling the valve position.
C. Passes 1600 psig hydraulic fluid to the operating cylinder of a controlling valve, keeping it fully
OPEN.
D. Energizes during the last 10% of operating cylinder travel (towards fully CLOSED) to cause
fast valve closure.

A

A

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11
Q

A valve associated with the main turbine that is classified as a CONTROLLING VALVE:

A. Utilizes a Servo valve
B. Is also classified as a SLAVE.
C. Utilizes a solenoid operated test valve.
D. Is the only valves to utilize a disk dump valve.

A

A

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12
Q

A valve associated with the main turbine that is classified as a NON-CONTROLLING VALVE:

A. Utilizes a solenoid operated test valve.
B. Is also classified as a MASTER.
C. Is the only valve to utilize a disk dump valve.
D. Utilizes a Servo valve.

A

A

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13
Q

The purpose of the Electro-Hydraulic Control System Purification Skid is:

A. Ensures the Electro-Hydraulic Control fluid is maintained Nitrogen free.
B. Removes Oxygen from the gas space in the reservoir.
C. Used only when adding oil to the system to maintain purity.
D. Removes water, particulate and metal salts from the Electro-Hydraulic Control fluid.

A

D

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14
Q

During normal operations, the Servo valve is positioned by EHC (Electrical) to provide a variable:

A. Emergency Trip System (ETS) pressure to the controlling valves operating cylinder.
B. Fluid Actuating System (FAS) pressure to the controlling valve’s operating cylinder.
C. Relayed Emergency Trip System (RETS) pressure to the controlling valves operating cylinder.
D. Fluid Jet System (FJS) supply pressure to the controlling valve’s operating cylinder.

A

B

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15
Q

During normal operations, the solenoid operated test valve sends:

A. Max FAS pressure to the operating cylinder of a non-controlling valve to keep it open.
B. Max ETS pressure to the operating cylinder of a non-controlling valve to keep it open.
C. Max RETS pressure to the operating cylinder of a controlling valve to keep it closed.
D. Max FCD pressure to the operating cylinder of a controlling valve to keep it open.

A

A

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16
Q

What value should be seen, during normal power operations, on the EHC pump discharge pressure
indicator at the EHC skid?

A. 1000 psig
B. 1100 psig
C. 1300 psig
D. 1600 psig

A

D

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17
Q

Which ONE of the following describes the Electro- Hydraulic (EHC) pump?

A. Positive Displacement Variable stroke piston
B. Positive Displacement Constant stroke piston
C. Positive Displacement gear
D. Centrifugal

A

A

18
Q

Which ONE of the following is used in the Electro-Hydraulic Control system accumulators?
A. Hydrogen
B. Nitrogen
C. Argon
D. Helium

A

B

19
Q

During a turbine load rejection the Combined Intermediate Valves (CIV’s) 1 and 2 will ___ _

A. modulate to control turbine speed
B. open fully to allow full steam flow
C. close fully to stop the turbine
D. modulate to control turbine electrical load

A

A

20
Q

Which ONE of the following is NOT an interlock that will trip the Electro-Hydraulic Control Filter Unit?

A. Outlet Filter High dP
B. Vacuum Chamber Fluid Level LOW
C. Vacuum Chamber Drip Pan Level HIGH
D. Electro-Hydraulic Control Filter Unit Vacuum HIGH

A

D

21
Q

The Electro-Hydraulic Control Filter Unit is running but the Ion Exchanger Module is shutdown.
Which ONE of the following is correct concerning this situation?

A. The Electro-Hydraulic Control filter unit is running to remove water and particulate from the
Electro-Hydraulic Control fluid.
B. The Electro-Hydraulic Control Filter Unit should NOT be running unless the Ion Exchanger
Module is running.
C. The Electro-Hydraulic Control purification unit has NOT been shutdown properly and the Shift
Manager should be notified.
D. The Ion Exchanger Module should be placed in service to ensure adequate suction pressure
for the Electro-Hydraulic Control Filter Unit.

A

A

22
Q

The Electro-Hydraulic Control pumps are ______ pumps.

A. high capacity, variable speed, centrifugal
B. variable delivery, positive displacement, piston
C. constant stroke, positive displacement, reciprocating piston
D. variable delivery, worm gear, positive displacement

A

B

23
Q

The need to change the desiccant in the Electro-Hydraulic Control(EHC) tank vent is indicated by
the desiccant turning:

A. Red
B. Blue
C. Pink
D. Orange

A

C

24
Q

A PINK color in the moisture indicator on the EHC skid air dryer indicates.

A. NORMAL operating conditions
B. oil is contaminated and has turned basic
C. oil is contaminated and has turned acidic
D. desiccant needs to be replaced or regenerated

A

D

25
Q

With the Main Turbine Mechanical Lockout Solenoid valve energized (in LOCKOUT position) __ .

A. the reactor will NOT trip if the turbine trips.
B. the only turbine trip disabled is primary overspeed trip.
C. all turbine trips except for the backup overspeed are disabled.
D. the MANUAL pull trip at the front standard is the only method to trip the turbine.

A

B

26
Q

Which ONE of the following statements is correct with respect to operation of the Main Turbine
Mechanical Lockout Solenoid valve?

With the Lockout Solenoid valve energized (in LOCKOUT position) ________ .

A. all turbine trips except for backup overspeed are disabled.
B. the only turbine trips disabled are primary overspeed (110%), and the trip button in the control
room.
C. the only turbine trip disabled is primary overspeed (110%).
D. the extraction steam air relay dump valve is prevented from bleeding off actuating air should
the turbine trip.

A

C

27
Q

Which of the following annunciators is NOT expected to be lit IMMEDIATELY after shutting down
the EHC pumps?

A. EHC FLUID SHUTDOWN LVL HI (15-6-B)
B. EHC FLUID LVL (15-3-B)
C. TURBINE TRIP (15-1-E)
D. EHC FLUID PRESS LO (15-2-B)

A

A

28
Q

The following annunciator has just come in., 5-2-B, EHC FLUID PRESS LO
Which ONE of the following annunciators is also expected to come in at this time?

A. 8-2-A, Turbine Trip
B. 15-1-B, EHC 2nd Pump Started
C. 15-3-B, EHC Fluid Level
D. 15-4-B, EHC Cabinet TRBL

A

B

29
Q

Annunciator EHC 2ND PMP STARTED (15-1-B) can be brought in by which TWO of these
conditions:

  1. The Second EHC Pump has started because of low discharge pressure on the running pump.
  2. An operator has started the standby EHC Pump for a pump swap.
  3. Annunciator EHC FLUID PRESS LO (15-3-B) has cleared.
  4. The EHC Filter Supply Pump has been locally started.

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

A

A

30
Q

The plant is at 85% power. Turbine valve testing is in progress. Due to control valve motion, EHC System pressure has dropped to 1200 psig.
Which one of the following sets of annunciators are expected to be in alarm?

  1. EHC 2ND PMP STARTED (15-1-8)
  2. EHC FLUID PRESS LO (15-2-8)
  3. EHC FLUID LVL (15-3-8)
  4. EHC CABINET TRBL (15-4-8)

A. 1 and 2
8. 1 and 4
C. 2 and 3
D. 3 and 4

A

A

31
Q

The “EHC FLUID PRESSURE LOW” alarm is at:
A. 800 psig
B. 1100 psig
C. 1300 psig
D. 1600 psig

A

C

32
Q

The EHC oil reservoir low level alarm is set at -4” below normal.
What is the primary concern when tank level LOWERS to this level?
A. EHC fluid cooling is lost.
B. Filtering system flow is lost.
C. EHC tank heaters begin to uncover at -4”.
D. Cavitation and possible damage to the EHC pumps.

A

D

33
Q

EHC FLUID SHUTDOWN LEVEL HIGH will alarm at: (Setpoint)
A. 3” above normal level.
B. 3” below the top of the tank.
C. 1 O” below the top of the tank.
D. 1 O” above normal level.

A

B

34
Q

The following annunciator has just come in: EHC FLUID PRESS LO (15-2-B)
What other annunciator would you also expect to come in at this time?

A. EHC 2nd PUMP STARTED (15-1-B)
B. EHC FLUID LEVEL (15-3-B)
C. TURBINE TRIP (8-2-A)
D. EHC CABINET TRBL (15-4-B)

A

A

35
Q

DB-OP-06204 EHC System Operating Procedure Limit and Precaution 2.2.3 states that caution
should be used when adjusting the running EHC Pump Pressure Compensator to prevent over
pressurizing the EHC System Piping.
Predict which of the following could result.

  1. Fire/Smoke Hazard
  2. Personnel Safety Hazard
  3. EHC Pump Trip
  4. Irritant Vapor/Mist Release
    A. 1, 2 and 3
    B. 1, 2 and 4
    C. 1, 3 and 4
    D. 2, 3 and 4
A

B

36
Q

To prevent overheating the EHC system while the Main Turbine is tripped, the following method is
used to ensure that there is flow through the EHC Coolers.
A. Valve FV1, Discharge Header Bypass, is THROTTLED.
B. Two EHC system coolers are placed in service.
C. Temporary ventilation is set up at the EHC skid.
D. The EHC Filtration System is removed from service

A

A

37
Q

Per DB-OP-06204, EHC Operations Procedure, the EHC Pump Discharge Pressure Compensator
should be adjusted slowly to prevent:
A. Over pressurizing the EHC system
B. Running out the EHC Pump
C. Cavitation of the EHC Pump
D. Depressurizing the EHC system

A

A

38
Q

If maintenance is performed on the EHC Pumps, which of the following does NOT need to be done
prior to starting the pump.
A. Refill the pump with clean fluid.
B. Verify that a minimum tank level is met.
C. Perform the appropriate valve lineup.
D. Verify the EHC Purification filter differential pressure is in specification.

A

D

39
Q

The EHC Operating Procedure (DB-OP-06204.06 step 2.2.1) states that the EHC pumps must be
stopped if reservoir level is less than “LOW”. This is because:
A. Water could get into the system
B. The inlet filter would not be covered
C. The pumps may cavitate
D. The level is below the scale of the indicator

A

C

40
Q

At a reactor power of 47%, an event has occured where all the Turbine stop and control valves
have closed. Which procedure provides guidance for this situation?
A. RPS, SFAS, SFRCS TRIP, or SG TUBE RUPTURE (DB-OP-02000)
B. Trip Recovery (DB-OP-06910)
C. Turbine Trip (DB-OP-02500)
D. Turbine Operations Procedure (DB-OP-06202)

A

A

41
Q

At a reactor power of 32%, an event has occurred where all Turbine stop and control valves have
closed. Which procedure provides guidance for this situation?
A. RPS, SFAS, SFRCS TRIP, or SG TUBE RUPTURE (DB-OP-02000)
B. Trip Recovery (DB-OP-06910)
C. Turbine Trip (DB-OP-02500)
D. Turbine Operating Procedure (DB-OP-06202)

A

C

42
Q

The ______ system provides high pressure fluid to control the operation of the Main
Turbine valves and drains.
A. Stator Cooling
B. T-G Lube Oil
C. Electro-Hydraulic Control
D. Integrated Control System

A

C

EO1 (14 decks)

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