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Systems 11-13-19 > IA (Instrument Air) > Flashcards

IA (Instrument Air) Flashcards

1
Q

Unit is operating at rated power.
‘A’ CREFAS is manually initiated with both trains of Control Room Essential AFUs running.
Window 7B01A ‘INST AIR SYSTEM TROUBLE’ alarms.
Instrument Air header pressure is noticed to be lowering.
If the air problem continues to degrade, the Control Room Essential AFUs…

A. Will trip.
B. Will lose cooling water.
C. Ventilation lineup will not change.
D. Outside air dampers will fail open.

A

C. Ventilation lineup will not change.

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2
Q

With regards to the Instrument Air system, The Ingersoll-Rand air compressors sends ______ to the separator tank?

A. Low temperature air and oil.
B. Low temperature, oil free air.
C. High Temperature air and oil.
D. High Temperature, oil free air.

A

C. High temperature air and oil.

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3
Q

What pressure does N2 system automatically align to supply IA?

What pressure does N2 system Close if aligned to supply IA?

A

N2 opens if IA pressure drops to 85 psi.

N2 closes if IA pressure rises to 105 psi.

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4
Q

What is Instrument Air Header pressure maintained at?

A

105 psi - 123 psi

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5
Q

State the minimum operating pressure to ensure satisfactory operation of ALL instrument air operating equipment:

A. 65 psig
B. 80 psig
C. 85 psig
D. 90 psig

A

B. 80 psig

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6
Q

A Loss of Instrument Air has occurred.
Nitrogen is supplying the Instrument Air Header.
In order to reduce the possibility of Nitrogen buildup in the Auxiliary Building, which of the following actions are taken?

A. Start a Fuel Building Essential Exhaust Fan taking suction on the Auxiliary Building
B. Isolate Instrument Air to the Auxiliary Building
C. Open all Auxiliary and Fuel Building Rollup Doors
D. Start a Fuel Building Essential Exhaust Fan Taking suction on the Fuel Building

A

A. Start a Fuel Building Essential Exhaust Fan taking suction on the Auxiliary Building

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7
Q

The following plant condition exist:
Instrument Air isolation valve IAA-UV-2 has inadvertently closed and will not reopen.
Service Air backup is available for containment, but not aligned.
Which one of the following describes the expected response of the Reactor Coolant Pump Seal Injection Supply Flow Control Valves (CHE-FV241, 242, 243, and 244) as containment IA header pressure drops?

A. Fail as-is
B. Fail fully closed.
C. No response, they are motor operated
D. Fail fully open

A

D. Fail fully open

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8
Q

A gradual loss of Instrument Air is occurring. The area operator reports a large differential pressure across the in service Instrument Air Dryer.
Which one of the following actions should be taken to assist in correcting this problem?

A. Bypass Air Dryers
B. Shutdown Air Dryers
C. Vent the Air Dryers
D. Shift Air Dryers

A

D. Shift Air Dryers

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9
Q

Unit 1 is operating at rated power.
A CREFAS is manually initiated with both trains of Control Room Essential AFUs running.
Window 7B01A ‘INST AIR SYSTEM TROUBLE’ alarms.
Instrument Air header pressure is noticed to be lowering.
If the air problem continues to degrade, the Control Room Essential AFUs…

A. Ventilation lineup will not change.
B. Will trip
C. Will lose cooling water
D. Outside air dampers will fail open

A

A. Ventilation lineup will not change.

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10
Q

Which of the following circulates oil through the Instrument Air Compressors?

A. Shaft driven oil pump
B. An AC driven oil pump
C. Moisture Separator Pressure
D. Separator Tank Pressure

A

D. Separator Tank Pressure

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11
Q

In the Interpol-Rand air compressors of the Instrument Air system, the air discharged from the separator tank is directed to…

A. After cooler, where the air cooled by incoming lubricating oil
B. After cooler, where the air is cooled by turbine cooling water
C. The instrument air system piping, supplying compressed air to various systems
D. Condensate separator/trap, where all remaining oil is removed

A

B. After cooler, where the air is cooled by turbine cooling water

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12
Q

Unit 1 is in Mode 1, 100% power.
Instrument air loads are normal for plant conditions.
IAN-C01A is tagged out for maintenance.
Currently IAN-C01C is the only compressor running.
A breaker trip results in a loss of power to the Intellisys Energy Optimizer (IEO) master controller PC-265.
Which of the following identifies the correct Instrument Air System configuration?

A. There are currently no Instrument Air Compressors running
B. ‘B’ instrument air compressor is off, ‘C’ is running loaded controlling from 105-115 psig
C. ‘C’ instrument air compressor is off, ‘B’ is running loaded controlling from 113-123 psig
D. ‘C’ instrument air compressor is off, ‘B’ is running loaded controlling from 109-119 psig

A

D. ‘C’ instrument air compressor is off, ‘B’ is running loaded controlling from 109-119 psig

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13
Q

The Intellisys Energy Optimizer (IEO) Master Controller will maintain a Target Pressure by loaded compressors when pressure is below the ‘lower pressure limit’.
The ‘lower pressure limit’ is defined as the Target Pressure minus…

A. One-eight of the control band.
B. One-fourth of the control band.
C. One-half of the control band.
D. Three-fourths of the control band.

A

C. One-half of the control band.

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14
Q

Which of the following will result in the closure of the Instrument Air Supply Valve to Containment?

A. Inadvertent ‘A’ Train CSAS
B. Containment pressure of 3.6 psig
C. Loss of PKB-M42 (Unit 1)
D. CIAS Only

A

A. Inadvertent ‘A’ Train CSAS

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15
Q

Unit 1 is operating at 100% power.
Instrument Air compressor ‘A’ is operating and maintaining IA pressure at 115 psig.
Instrument Air Dryer IAN-M01C is in service.
Subsequently
Window 7B01A (Inst Air System Trouble) is in alarm.
Alarm point IAPDS238 (Instrument Air Filter After Filter ‘C’ Differential Press Hi) is alarming
IAP-PI-32 (IA Header Pressure) is 98 psig and dropping slowly.
Instrument Air compressors ‘B’ and ‘C’ have started.
Which ONE of the following describes the impact to the IA system and the appropriate procedural action?
The IA header pressure will continue to LOWER…

A. To approximately 85 psig, implement 40AO-9ZZ06 (Loss of Instrument Air), to perform leak isolation
B. To approximately 85 psig, implement 40AO-9ZZ06 (Loss of Instrument Air), to valve to another air dryer
C. Requiring a reactor trip, implement 40EP-9EO01 (Reactor Trip) and maintain Heat Removal with Auxiliary Feedwater pumps and Atmospheric Dump Valves
D. Requiring a reactor trip, implement 40EP-9EO01 (Reactor Trip) and maintain Heat Removal with Main Feedwater pumps and the Steam Bypass Control Valves

A

B. To approximately 85 psig, implement 40AO-9ZZ06 (Loss of Instrument Air), to valve to another air dryer

(Note: From the stem the examiner should be able to determine that the in-service dryer ‘C’ has a high dp and is causing the low pressure in the IA header. The Nitrogen backup valve opens at 85 psig and will maintain IA header pressure until the standby dryer can be placed in service IAW 40AO-9ZZ06 (Loss of Instrument Air))

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16
Q

Unit 1 has experienced a Loss of Instrument Air (IA) to the Containment.
The CRS is implementing 40AO-9ZZ06 (Loss of Instrument air).
Which ONE of the following valve hand switches must be taken to CLOSE prior to restoring IA to Containment per 40AO-9ZZ06 (Loss of Instrument Air).

A. CHA-HV-507 (RCP Bleedoff Isolation to RDT)
B. CHA-UV-516 (Letdown to Regen Hx Isolation)
C. WCB-UV-61 (CHW Return HDR Inside CNTMT Isol VLV)
D. NCV-UV-403 (NCW CNTMT Downstream Return Isol VLV)

A

B. CHA-UV-516 (Letdown to Regen Hx Isolation)

(Note: Per step 4 of section 3.0, this valve will fail closed but if the hand switch is not taken to close the valve will open upon restoration of IA and possibly lead to damage of the letdown IXs.)

17
Q

Unit 1 is operating at 100% power.
RCS pressure is being maintained at 2230 psia.
The pressurizer is in Boron Equalization.
Subsequently
RCS pressure is slowly increasing.
Letdown flow goes to 0 gpm.
Main Spray valves RCN-PV-100E/F indicate closed.
CHB-UV-515, Letdown to Regen HX isolation valve, indicates closed.
CHA-UV-516, Letdown to Regen HX isolation valve, indicates closed.
Which one of the following is correct for these indications?

A. CIAS has actuated. Verify Containment parameters.
B. Nuclear Cooling Water flow has been lost. Cross-tie Essential Cooling Water.
C. Instrument air leak in Containment. Close IAA-UV-2, Instrument Air Outside Containment Isolation.
D. NNN-D11 (Non-class instrument power) has de-energized. Align the Instrument bus to it’s alternate supply.

A

C. Instrument air leak in Containment. Close IAA-UV-2, Instrument Air Outside Containment Isolation.

18
Q

Unit 1 is operating in a full power alignment.
The normal Instrument Air pressure is ____ psig and the Nitrogen backup valve opens at ____ psig.

A. (A) 115 (B) 85
B. (A) 115 (B) 85
C. (A) 105 (B) 95
D. (A) 105 (B) 95

A

B. (A) 115 (B) 85

19
Q

Unit 1 is operating at 100% power.
Instrument Air System (IA) is aligned for normal operation.
IA system pressure is 110 psia.
Instrument Air Dryer IAN-M01D has failed and will not supply the IA system.
Which one of the following is correct?

A. Nitrogen backup valve will open and maintain normal IA header pressure.
B. The IA header pressure will decrease to ~85 psia. Implement 40AO-9ZZ06, Loss of Instrument Air, to valve in another air dryer.
C. IA dryers are normally aligned for parallel operation. IAN-M01C will maintain normal IA header pressure.
D. IAN-C02 Service Breathing Air compressor can be aligned to maintain IA pressure ~110 psia per 40OP-9IA02, Service/Breathing Air System

A

B. The IA header pressure will decrease to ~85 psia. Implement 40AO-9ZZ06, Loss of Instrument Air, to valve in another air dryer.]

20
Q

Which of the following is true regarding an Instrument Air pipe rupture in the Main Steam Support Structure (MSSS)?

A. Service Air will supply all loads.
B. Accumulator will provide ADV operation.
C. Low Pressure Nitrogen will supply all loads.
D. Economizer Feedwater isolation valves fast closure and slow mode of operation are available via the accumulator

A

B. Accumulator will provide ADV operation.

(Note: Accumulator will allow ADV operation for up to 8 hours. Nitrogen backup may open on low pressure but the pipe break makes this useless.)

21
Q

The Unit 1 crew has implemented 40AO-9ZZ06, Loss of Instrument Air.
IAA-UV-2, Outside CNTMT Isol Valve, has failed CLOSED and will NOT reopen from B07.
When attempting to align Service Air via the cross-tie, the Cross-Tie filters indicated a need for replacement (yellow indicator).
In accordance with 40AO-9ZZ06, ____ which ONE of the following actions must be taken to restore the Containment Instrument Air header and ____ what will be the makeup source?

A. (1) Manually open UV-2, in the East Penetration of the AB 120’ elevation, using the LOCAL valve operator
(2) Service Air
B. (1) Manually open UV-2, in the East Penetration of the AB 120’ elevation, using the LOCAL valve operator
(2) Instrument Air
C. (1) Install a temporary modification to route a rubber hose between two valves on the 90’ elevation inside Containment
(2) Instrument Air
D. (1) Install a temporary modification to route a rubber hose between two valves on the 90’ elevation inside Containment
(2) Low pressure Nitrogen

A

D. (1) Install a temporary modification to route a rubber hose between two valves on the 90’ elevation inside Containment
(2) Low pressure Nitrogen

22
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 (mottos 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.

23
Q

A gradual loss of Instrument Air is occurring. The are operator reports a large differential pressure across the in service Instrument Air Dryer.
Which ONE of the following actions should be taken to assist in correcting this problem?

A. Shift Air Dryers
B. Bypass Air Dryers
C. Vent the Air Dryers
D. Shutdown Air Dryers

A

A. Shift Air Dryers.

24
Q

Unit 1 is at 50% power.
The crew is experiencing problems controlling feedwater flow.
Instrument Air pressure is 40 psig and SLOWLY DECREASING.
Letdown Line Isolation valves indicate INTERMEDIATE.
Which ONE of the following actions should be taken?

A. Trip the reactor and go to SPTAs
B. Align nitrogen supply to the ADVs
C. Secure service air to non-vital loads
D. Commence a power reduction to hot shutdown

A

A. Trip the reactor and go to SPTAs

25
Q

Offsite power has been lost.
A valid alarm is received on alarm window 7B01B, ‘INST AIR HDR PRESS LO.’
Instrument air header pressure is 89 psig and dropping.
Which ONE of the following describes the next expected plant response?

A. Pressurizer main spray valves fail closed.
B. Letdown containment isolation valves fail closed.
C. Nitrogen backup valve opens to maintain header pressure.
D. Reactor Coolant Pump seal injection control valves fail open.

A

C. Nitrogen backup valve opens to maintain header pressure

Systems 11-13-19 (41 decks)

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