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Systems 11-13-19 > HVAC > Flashcards

HVAC Flashcards

1
Q

State the reason Control Room Smoke Removal Isolation Dampers M56 and M57 are maintained in the OPEN position:

A. Because that’s where the blue dot is
B. These are the suction dampers, the discharge dampers are maintained CLOSED and auto open in the event of a fire
C. These dampers have redundant in-line dampers that are maintained closed
D. It makes the control room doors easier to open, these dampers close on a SIAS

A

D. It makes the control room doors easier to open, these dampers close on a SIAS

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2
Q

Unit 1 Aux Building Normal HVAC is aligned with only the ‘A’ Train supply and exhaust fans running.
The Reactor Operator attempting to start the ‘B’ Train supply and exhaust skips a page in the procedure and takes the hand switch HAN-HA-2 to start (‘B’ Train Normal AHU HAN-A01B)
Which of the following accurately describes the current alignment of Aux Building Normal HVAC?

A. The ‘B’ Train Supply AHU will not start.
B. The ‘B’ Train Supply AHU starts, which results in a positive pressure in the Aux Building, possibly releasing unmonitored contamination.
C. The ‘A’ Train Supply AHU immediately trips. The ‘B’ Supply and ‘A’ Exhaust are running.
D. The ‘B’ Train Supply and Exhaust both start.

A

C. The ‘A’ Train Supply AHY immediately trips. The ‘B’ Supply and ‘A’ Exhaust are running.

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3
Q

Which of the following signals will isolate the Aux Building HVAC below the 100ft level?

A. SIAS
B. FBEVAS with SIAS
C. FBEVAS
D. CREFAS

A

A. SIAS

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4
Q

Which of the following signals will automatically start the Class 1E Electrical Penetration Room ACUs?

A. SIAS ONLY
B. LOP with SIAS
C. SIAS or CSAS
D. LOP or SIAS

A

D. LOP or SIAS

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5
Q

Unit 1 is in mode 1 100% power.
All Control Room HVAC systems are in the normal alignment.
Startup transformer MAN-X02 trips on a sudden pressure fault.
Which of the following will occur?

A. The ‘A’ Train Control Room Essential Filtration unit will start
B. The ‘A’ and ‘B’ Train Control Room Essential Filtration units will start
C. The Control Room Normal ACU will automatically stop
D. The Control Building Normal ACU will automatically stop

A

C. The Control Room Normal ACU will automatically stop

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6
Q

Which of the following signals will start the Class Battery Room Exhaust Fan?

A. Trip of the corresponding Normal Battery Room Exhaust Fan
B. High Differential Pressure
C. LOP ONLY
D. SIAS or LOP

A

D. SIAS or LOP

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7
Q

Unit 2 was manually tripped per 40AO-9ZZ02, Excessive RCS Leakrate.
The CRS has implemented 40EP-9EO03, Loss of Coolant Accident.
Containment pressure peaked at 4.2 and is currently 3.8 psig.
All the required automatic ESFAS actuations have properly initiated.
What is the expected status and required actions (if any) to recover the Containment Normal ACUs?

A. The Containment Normal ACUs are running and Normal Chill Water (WC) is available.
B. The Containment Normal ACUs are tripped, go to start twice to restart, Normal Chill Water (WC) is available.
C. The Containment Normal ACUs are running but Normal Chill Water (WC) is isolated and the valves must be over-ridden to open.
D. The Containment Normal ACU are tripped, go to stop then start to restart. Normal Chill Water (WC) is isolated and the valves must be over-ridden to open.

A

D. The Containment Normal ACU are tripped, go to stop then start to restart. Normal Chill Water (WC) is isolated and the valves must be over-ridden to open.

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8
Q

Which one of the following correctly describes the operation of the Main Steam Support Structure (MSSS) Penetration Cooling system?

A. One MSSS Penetration AFU in operation, two MSSS Penetration Exhaust Fans in operation. The other MSSS Penetration AFU fan will auto-start on low D/P
B. Two MSSS Penetration AFU Fans in operation, one MSSS Penetration Exhaust Fan in operation. The other MSSS Penetration AHU fan will auto-start on low D/P.
C. One MSSS Penetration AFU Fan in operation, one MSSS Penetration Exhaust Fans in operation. There are no auto-start features associated with the MSSS Penetration Cooling system.
D. Two MSSS Penetration AFU Fans in operation, two MSSS Penetration Exhaust Fans in operation. A low D/P on the MSSS Penetration AFU fan will initiate a trip of the associated MSSS AHU fan.

A

A. One MSSS Penetration AFU Fan in operation, two MSSS Penetration Exhaust Fans in operation. The other MSSS Penetration AFU fan will auto-start on low D/P.

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9
Q

Given the following Unit 2 conditions:
Time 0 - The 120 VAC control circuit fuse for the CS pump room essential ACU (PHA-M3533) blows.
Time 1 - An inadvertent ‘A’ train CSAS actuates.
Assuming that the blown fuse has not been replaced, which one of the following is correct regarding the White (SEAS) and Blue (SEIS) lights on the Safety Equipment Status System ESA-UA-2A alarm panel?

A. Time 0 - White light off, Blue light on.
Time 1 - White light on, Blue light on.
B. Time 0 - White light on, Blue light off.
Time 1 - White light on, Blue light off.
C. Time 0 - White light on, Blue light off.
Time 1 - White light on, Blue light on.
D. Time 0 - White light off, Blue light on.
Time 1 - White light off, Blue light on.

A

C. Time 0 - White light on, Blue light off.

Time 1 - White light on, Blue light on.

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10
Q

Unit 1 is operating at rated power.
The ‘A’ train CEDM cooling fans (A02A/A02C) are running.
The ‘B’ train CEDM cooling fans (A02B/A02D) are in standby.
Subsequently
Alarm window 7A9B, CEDM ACU COOLS SYS TRBL alarms.
The Operator observes that CEDM cooling fan A02A has a brighter than normal green light.
Assuming no Operator action…

A. Only A02C is running, full power operation may continue per 40AO-9ZZ20, Loss of HVAC.
B. A02B will start after a 120 second time delay, full power operation may continue per 40AL-9RK7A, panel B07A alarm response.
C. Only A02C is running, start an additional CEDM cooling fan within 10 minutes or perform a Rapid Shutdown per 40OP-9ZZ05 Power Operations.
D. Only A02C is running, start an additional CEDM cooling fan within 40 minutes or trip the reactor and Cooldown the RCS to less than 300 F within 4 hours per 40OP-9ZZ10, Mode 3 to Mode 5 operations.

A

A. Only A02C is running, full power operation may continue per 40AO-9ZZ20, Loss of HVAC.

(Note- There is no low D/P with a single fan running, no additional fans start and full power operation is permitted with a single fan running)

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11
Q

Unit 3 is operating at 100% power.
An Inadvertent SIAS has occurred.
Which ONE of the following describes the status of the Containment Normal ACUs?
The Containment Normal ACUs…

A. Continue to run
B. Are load shed and must be manually started by an operator.
C. Are load shed and will sequence back on after 120 seconds.
D. Shift to take suction on elevations 100’ and below in containment.

A

B. Are load shed and must be manually started by an operator.

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12
Q

Unit 3 is operating at rated power.
The ‘A’ train CEDM cooling fans (A02A/A02C) are running.
THEN
Alarm window 7A9B, CEDM ACU COOLS SYS TRBL, alarms.
The Operator observes that BOTH CEDM cooling fans A02A/A02C have brighter than normal green lights.
Under these conditions, the ‘B’ train CEDM fans should ____ and, if cooling is NOT restored, then ____.

A. (1) start immediately
(2) the Reactor must be tripped within 10 minutes of loss of cooling.
B. (1) start within 2 minutes
(2) the Reactor must be tripped within 10 minutes of loss of cooling.
C. (1) start immediately
(2) the Reactor must be tripped within 40 minutes of loss of cooling.
D. (1) start within 2 minutes
(2) the Reactor must be tripped within 40 minutes of loss of cooling.

A

D. (1) start within 2 minutes

(2) The Reactor must be tripped within 40 minutes of loss of cooling.

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13
Q

Containment Building Normal ACU Fans A01A and A01C are running.
Containment Building Normal ACU Fans A01B and A01D control switches are in Normal After Stop.
Fan A01A trips.
Two minutes after the A01A fan trips, fans ____ will be running to help maintain Containment Air Temperature within the Technical Specification 3.6.5 limit of ____ F.

A.  1. A01B and A01D
      2. 117
B.  1. A01B and A01D
      2. 170
C.  1. A01B and A01C
      2. 117
D.  1. A01B and A01C
      2. 170
A

C. 1. A01B and A01C

2. 117

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14
Q

Unit 1 is operating at 100% power.
RU-31, Spent Fuel Pool Area, monitor exceeds the high trip setpoint.
The Fuel Building Normal Supply and Exhaust units have stopped.
The Control Room Essential AHUs have started.
Which ONE of the following describes the response of the Fuel Building Essential Air Filtering Unit A and the Control Room Essential Air Handling Units Outside Air Intake Damper?

      FB Ess AFU A.          CR Ess AHUs OSA Damper
A.  Started.                      Open
B.  Started.                      Closed
C.  Stopped.                   Open
D.  Stopped.                   Closed
A

A. Started. Open

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15
Q

Which of the following describes why 40AO-9ZZ06, Loss of Instrument Air, directs aligning a Fuel Building Essential Air Filtration Unit, AFU, to the auxiliary building during a complete loss of Instrument Air?

A. The essential AFU is required to augment the normal AFUs, ensuring a negative pressure is maintained.
B. Due to the number of additional heat loads (motors and piping), additional air movement is necessary.
C. The essential AFU will circulate air below the 100’ elevation, which may contain nitrogen from leaking air connections.
D. Since the normal AHUs and AFUs trip on a loss of instrument air, the Fuel Building essential AFUs will ensure Aux Building ventilation is maintained.

A

C. The essential AFU will circulate air below the 100’ elevation, which may contain nitrogen from leaking air connections.

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16
Q

Unit 1 is operating at 100% power.
RU-8 (Auxiliary Building Ventilation Exhaust Filter Inlet) is in ALERT.
RU-9 (Auxiliary Building Lower Level Exhaust) is in ALERT.
RU-143 (Plant Vent) readings are rising.
All other radiation monitors read background.
Which of the following describes the event that is occurring?

A. Charging system leak.
B. Steam Generator Tube leak.
C. Waste Gas Decay Tank leak.
D. Letdown Heat Exchanger tube leak.

A

A. Charging system leak.

17
Q

Unit j1 is at 100% power.
Class 4.16 kVA bus PBB-S04 has faulted and is de-energized.
Subsequently
Nuclear Cooling Water valve from the CEDM ACUs A02A/A02C, NCN-HV-485 fails closed.
Which one of the following is appropriate action per 40AO-9ZZ20, Loss of HVAC?

A. Start CEDM ACUs A02B/A02D to restore cooling.
B. Trip the reactor and perform SPTAs within a maximum of 10 minutes from the loss of cooling.
C. Limit CEA motion to that needed for ASI control and decrease power to shutdown the unit within 4 hours.
D. Commence a rapid down power within 10 minutes and have RTSG breakers opened within 40 minutes of the loss of cooling.

A

D. Commence a rapid down power within 10 minutes and have RTSG breakers opened within 40 minutes of the loss of cooling.

(Note: ‘B’ Train is OOS due to no power. There are separate valves for each CEDM ACU though)

18
Q

The Containment Normal ACUs, HCN-A01A thru D are cooled by ____ and will be isolated by a ____.

A. (1) Normal Chilled Water (2) CIAS
B. (1) Normal Chilled Water (2) CSAS
C. (1) Nuclear Cooling Water (2) CIAS
D. (1) Nuclear Cooling Water (2) CSAS

A

A. (1) Normal Chilled Water (2) CIAS

19
Q

Unit 1 operating at 100% power.
Containment pressure is -0.1 psig.
A train ‘B’ CSAS has inadvertently actuated.
(1) Based on these conditions, the design negative pressure for Containment ____ be exceeded.
(2) To stop any operating Containment Spray Pumps, the RO will ____.

A. (1) Will
(2) Override and stop the Containment Spray Pump
B. (1) Will NOT
(2) Override and stop the Containment Spray Pump
C. (1) Will
(2) Place the Containment Spray Pump hand switch in ‘STOP’ to anti-pump the CS Pump
D. (1) Will NOT
(2) Place the Containment Spray Pump hand switch to ‘STOP’ to anti-pump the CS Pump.

A

D. (1) Will NOT

(2) Place the Containment Spray Pump hand switch to ‘STOP’ to anti-pump the CS Pump.

20
Q

The amount of gaseous iodine in the containment atmosphere is minimized during normal conditions by the use of ____ filters and is minimized during a LOCA by maintaining pH of the water in containment ____ 7.0.

A.  1.  HEPA 
      2.  Less than
B.  1.  HEPA
      2.  Greater than
C.  1.  Charcoal
      2.  Less than
D.  1.  Charcoal
      2.  Greater than
A

D. 1. Charcoal

2. Greater than

21
Q

The charcoal absorbers installed in the Fuel Building Essential AHUs is responsible for removing ____ from the air.

A. Foul odors
B. Gaseous iodine
C. Entrained oil vapor
D. All radioactive isotopes

A

B. Gaseous Iodine

22
Q

Unit 3 is performing a core offload.
Containment is closed.
The fuel transfer canal is open.
Subsequently
The Area 3 operator notices that Spent Fuel Pool level is lower than it was when he started the shift.
Which ONE of the following would cause the lower level in the Spent Fuel Pool?

A. A Fuel Building supply fan tripped
B. A Refueling Purge supply fan tripped
C. A loss of Instrument Air to the Cask Loading Pit gate.
D. A loss of Instrument Air to Decontamination Pit gate.

A

B. A Refueling Purge supply fan tripped.

23
Q

Why do the Fuel Essential AFUs automatically align to the Auxiliary Building during a SIAS?

A. The essential AFU simply augment the normal AFUs, ensuring a negative pressure is maintained.
B. Due to the number of additional heat loads, such as motors and piping, additional air movement is necessary.
C. The essential AFUs are responsible for treating the air below the 100’ elevation, which may contain contamination from a SI pump seal failure.
D. Since the normal AHUs and AFUs trip on a SIAS, the Fuel Building Essential AFUs will ensure a negative pressure is kept on the building.

A

C. The essential AFUs are responsible for treating the air below the 100’ elevation, which may contain contamination from a SI pump seal failure.

24
Q

Unit 1 is operating at rated power.
DG ‘A’ is under clearance and OOS for planned maintenance.
A low level alarm is received on the ‘B’ Essential Chill water surge tank.
Area 3 reports a leak on the HPSI pump room But Essential ACU, HAB-Z01.
Chill Water (EC) is isolated to HAB-Z01.
Which one of the following correctly reflects HPSI pump status?

A. HPSI pumps A/B are both Inoperable but functional
B. HPSI pumps A/B are both Inoperable and non-functional
C. HPSI pump A is Operable and functional provided offsite power is available to PBA-S03
D. HPSI pump B is Operable and functional provided room temperature is maintained < 104 F

A

A. HPSI pumps A/B are both Inoperable but functional

25
Q

Which of the following provides cooling medium for the CEDM cooling units?

A. Nuclear Cooling Water
B. Essential Chilled Water
C. Normal Chilled Water
D. Containment ambient air

A

A. Nuclear Cooling Water

26
Q

Which of the following accurately describes the operation of the Containment Normal ACUs?

A. Normally 2 of 4 fans are running being cooled by WC
B. Normally 2 of 4 fans are running being cooled by NC
C. Normally 4 of 4 are running being cooled by WC
D. Normally 2 of 2 fans are running being cooled by NC

A

A. Normally 2 of 4 fans are running being cooled by WC

27
Q

Given the following conditions:
Unit 1 is in Mode 1 at 100% power.
Containment HVAC is in normal alignment.
The Control Operator is shifting CEDM fans from the ‘A’’ & ‘C’ fans running to the ‘B’ & ‘D’ fans running.
Using poor procedure use and adherence the operator takes HCA-HS-49 for the A/C CEDM fans to stop.
Which of the following describes the system response?

A. The B & D fans start immediately
B. The B & D fans start after 60 seconds
C. The B & D fans start after 120 seconds
D. All four fans start after 120 seconds

A

D. All four fans start after 120 seconds

28
Q

Given the following conditions:
Unit 1 is in Defueled.
Containment HVAC is aligned for Refueling Purge.
Describe how the Refueling Purge Dampers respond to a loss of instrument air.

A. Fail Closed
B. Fail Open
C. Fail As Is
D. Unaffected

A

D. Unaffected

Note: CIVs and exhaust fan dampers are motor operated. Supply fan dampers are air operated/fail closed

29
Q

The Power Access Purge Containment Inlet Isolations are interlocked such that they will not open ____ psig in containment. The Containment Power Access Purge Valve (CPN-PV-43) will not open ____ psig in containment.

A. Below 0.03, above 1.3
B. Above 0.03, above 0.5
C. Above 0.5, above 0.03
D. Below 0.03, below 0.5

A

B. Above 0.03, above 0.5

Systems 11-13-19 (41 decks)

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