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LOCT Exam Bank > DFWCS > Flashcards

DFWCS Flashcards

1
Q

The plant is at 100% power. A gradual loss of instrument air occurs. As instrument air pressure decreases, which of the following events occur first?

A. Feedwater economizer reg valves fail in current position.
B. Main feedwater pump speed decreases.
C. Heater drain tank pump discharge valve fails open.
D. Condensate pump miniflow valves fail open.

A

Answer: D

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2
Q

Which of the following inputs to the Digital Feedwater Control System is used for indication only?

A. Tavg
B. Downcomer flow transmitters
C. Turbine Load Index
D. Steam Bypass Master Controller output

A

Answer: B

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3
Q

At rated power.
FWCS #1 Master in manual with 50% output.
FWCS #2 Master in automatic with 50% output.
A Reactor Trip occurs. Which one of the following is true?

A. FWCS #2 will enter RTO, FWCS #1 will not.
B. Both FWCS will enter RTO and remain in RTO if SG levels are

A

Answer: B

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4
Q

Which one of the following describes the level transmitter signal(s) used for SG level control on SG 1 DFWCS when it is in a normal configuration?

A. The higher output of LT-1111 and LT-1112
B. The output of LT-1111 only
C. The lower output of LT-1111 and LT1112
D. The average output of LT-1111 and LT-1112

A

Answer: A

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5
Q

Rx power is 100% All the control input transmitters to the Digital Feedwater Control system are in service and selected to AVERAGE If a Steam Generator feed flow transmitter fails low which of the following describes the automatic action that would take place in the DFWCS at an 8% deviation between the feed flow transmitters? The affected master controller would:

A. stay in automatic, 3-element control, using the good feedwater flow transmitter signal only.
B. shift to manual with the output signal that was present at the 8% deviation point.
C. stay in automatic, 3-element control, using the average feedwater flow transmitter signal.
D. stay in automatic but in single-element control.

A

Answer: D

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6
Q

Assume that all digital feedwater control system control input transmitters are in service. The plant is at 16.5% power. Power is slowly increasing. Steam Generator #1 downcomer valve position is 85% and is opening slowly. Steam Generator #2 downcomer valve position is 75% and is opening slowly. Concerning the digital feedwater control system, which (if any) of the following automatic actions will occur?

A. Both Steam Generators #1 and #2 will go through swapover.
B. Only Steam Generator #2 will go through swapover.
C. Only Steam Generator #1 will go through swapover.
D. No DFWCS automatic action will occur until both Steam Generator downcomer valves are 80% open.

A

Answer: A

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7
Q

Unit 1 is at 100% power All control input transmitters to the Digital Feedwater Control system (DFWCS) are in service and selected to AVERAGE(where applicable). One feedwater flow transmitter fails low. Which one of the following describes the operator action for this DFWCS input failure?

A. No action required because the DFWCS will automatically choose the higher flow at 4% flow deviation.
B. Place the lower reading feedwater flow transmitter into maintenance.
C. No action required because the DFWCS will automatically choose the higher flow at 8% flow deviation.
D. Place the higher reading feedwater flow transmitter to maintenance.

A

Answer: B

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8
Q

Unit 1 is at 100% power. All control input transmitters to the Digital Feedwater Control system (DFWCS) are in service and functioning normally. A #1 SG level transmitter fails low. Steam Generator #1 DFWCS Master Controller will ____________

A. remain in automatic 3-element control, using the lower indicating level transmitter.
B. shift to manual single element control.
C. remain in automatic 3-element control using the higher indicating level transmitter.
D. shift to single element automatic control, using the higher indicating level transmitter.

A

Answer: C

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9
Q

Unit 1 is at 100% power All control input transmitters to the Digital Feedwater Control system (DFWCS) are in service. A steam generator steam flow transmitter fails low. Which one of the following describes the automatic action that would take place in the DFWCS at a 50% deviation between the steam flow transmitter input signals? The affected master controller would:

A. shift to manual with the output signal that was present at the 8% deviation point.
B. remain in automatic but in single element control.
C. remain in automatic, 3-element control, using the good steam flow transmitter signal only.
D. remain in automatic 3-element control, using the sum of the two steam flow transmitters.

A

Answer: B

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10
Q

Unit 1 is operating at 26% power. MFP “A” is running. Both feed water control systems are in auto. SGN-LT-1111, SG-1 Level fails high. Based on these conditions, the operator can expect:

A. DFWCS #1 to enter high level override.
B. feed pump speed to lower.
C. feed pump speed to remain the same.
D. SG-1 downcomer control valve to throttle closed.

A

Answer: C

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11
Q

Assume that all digital feedwater control system control input transmitters are in service and selected to AVERAGE. The plant is at 15.5% power. Power is slowly increasing. Steam Generator #1 downcomer valve position is 80% and is opening slowly. Steam Generator #2 downcomer valve position is 70% and is opening slowly. Concerning the digital feedwater control system, which (if any) of the following automatic actions will occur?

A. Both Steam Generator #1 and Steam Generator #2 will go through swapover.
B. Only Steam Generator #1 will go through swapover.
C. No DFWCS automatic action will occur until 16.5% power is reached.
D. No DFWCS automatic action will occur until both Steam Generator downcomer valves are 80% open.

A

Answer: A

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12
Q

Unit 1 is operating at rated power DFWCS is in a normal line up (no transmitters in maintenance) RRS has Tavg selected to “average” If Tavg fails HIGH during a reactor trip, both DFWCS would…

A. prevent feeding of the Steam Generators.
B. be prevented from entering RTO.
C. feed at the maximum rate as permitted by RTO.
D. feed at the minimum rate as permitted by RTO.

A

Answer: C

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13
Q

Reactor power is at 25% and DFWCS is in automatic. A feedwater temperature transmitter fails low. Which of the following represents the canned value that will be used by DFWCS?

A. 350 deg F
B. 0 deg F
C. 425 deg F
D. 500 deg F

A

Answer: C

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14
Q

All control input transmitters to the Digital Feedwater Control system are in service. A loss of NNN-D11 occurs. Which of the following describes the operator action(s), if any, that need to be taken to stabilize the plant?

A. Take manual speed control of MFP A and B
B. No operator action required
C. Take manual control of DFWCS A
D. Take manual control of DFWCS A and B

A

Answer: B

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15
Q

Unit 1 is at 100% power. All control input transmitters to the Digital Feedwater Control system (DFWCS) are in service and functioning normally. A #1 SG level transmitter fails low. Steam Generator #1 DFWCS Master Controller will ____________

A. remain in automatic 3-element control, using the lower indicating level transmitter.
B. shift to manual single element control.
C. remain in automatic 3-element control using the higher indicating level transmitter.
D. shift to single element automatic control, using the higher indicating level transmitter.

A

Answer: C

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16
Q

Rx power is 100% All the control input transmitters to the Digital Feedwater Control system are in service and selected to AVERAGE If a Steam Generator feed flow transmitter fails low which of the following describes the automatic action that would take place in the DFWCS at an 8% deviation between the feed flow transmitters? The affected master controller would:

A. stay in automatic, 3-element control, using the good feedwater flow transmitter signal only.
B. shift to manual with the output signal that was present at the 8% deviation point.
C. stay in automatic, 3-element control, using the average feedwater flow transmitter signal.
D. stay in automatic but in single-element control.

A

Answer: D

17
Q

At rated power. FWCS #1 Master in manual with 50% output. FWCS #2 Master in automatic with 50% output. A Reactor Trip occurs. Which one of the following is true?

A. FWCS #2 will enter RTO, FWCS #1 will not.
B. Both FWCS will enter RTO and remain in RTO if SG levels are

A

Answer: B

18
Q

The plant is at 100% power. A gradual loss of instrument air occurs. As instrument air pressure decreases, which of the following events occur first?

A. Feedwater economizer reg valves fail in current position.
B. Main feedwater pump speed decreases.
C. Heater drain tank pump discharge valve fails open.
D. Condensate pump miniflow valves fail open.

A

Answer: D

19
Q

Which one of the following describes the level transmitter signal(s) used for SG level control on SG 1 DFWCS when it is in a normal configuration?

A. The higher output of LT-1111 and LT-1112
B. The output of LT-1111 only
C. The lower output of LT-1111 and LT1112
D. The average output of LT-1111 and LT-1112

A

Answer: A

20
Q

Unit 1 is operating at rated power. NI control channel UIC-2 input to DFWCS is in “maintenance”. All other control systems are in a normal configuration. UIC-1 fails low. Disregarding the possible impact on the MFPs, how would you expect the feedwater control valves to initially respond to this failure?

A. Only SG #1 economizer closes.
B. Both SG downcomers remain open and both economizers close.
C. Ony SG #1 downcomer and economizer close.
D. Both SG downcomers and economizers close.

A

Answer: B

21
Q

Unit 1 is operating at 26% power. MFP “A” is running. Both feed water control systems are in auto. SGN-LT-1111, SG-1 Level fails high. Based on these conditions, the operator can expect:

A. DFWCS #1 to enter high level override.
B. feed pump speed to lower.
C. feed pump speed to remain the same.
D. SG-1 downcomer control valve to throttle closed.

A

Answer: C

22
Q

The status of the Feedwater Control System is as follows: Feedwater Control System 1 (FWCS) is selected to Excore Nuclear Instrumentation Control Channel 1. FWCS 2 is selected to AVERAGE on the Excore Nuclear Instrumentation. The Excore Nuclear Control Channel 1 fails and its indication drops to zero and AMI is received at window 4A10B. Which ONE of the following operator actions relative to FWCS is necessary as a result of this failure?

A. Verify that S/G 1 economizer valve is automatically controlling S/G 1 level.
B. Take the manual control of the S/G 1 and S/G 2 Economizer, Downcomer and FWPT speed and restore S/G levels.
C. Take manual control of S/G 1 economizer, downcomer and associated FWPT and restore S/G 1 level; All S/G 2 components are left in automatic.
D. Trip one feedwater pump and then trip the reactor.

A

Answer: B

23
Q

Unit 1 is at 100% power All control input transmitters to the Digital Feedwater Control system (DFWCS) are in service. A steam generator steam flow transmitter fails low. Which one of the following describes the automatic action that would take place in the DFWCS at a 50% deviation between the steam flow transmitter input signals? The affected master controller would:

A. shift to manual with the output signal that was present at the 8% deviation point.
B. remain in automatic but in single element control.
C. remain in automatic, 3-element control, using the good steam flow transmitter signal only.
D. remain in automatic 3-element control, using the sum of the two steam flow transmitters.

A

Answer: B

24
Q

Plant is at 50% power Regulating Group 5 is 130” withdrawn CEDMCS is in AUTO Control Channel #1 is in maintenance on DFWCS (no ATUN Lockout) All other systems in normal configuration IF Control Channel #2 fails low, which one of the following should be expected?

A. Neither DFWCS #1 and #2 would go through swapover.
B. Only DFWCS #1 goes through swapover.
C. Only DFWCS #2 goes through swapover.
D. Both DFWCS #1 and #2 would go through swapover.

A

Answer: D

25
Q

Assume that all digital feedwater control system control input transmitters are in service and selected to AVERAGE. The plant is at 15.5% power. Power is slowly increasing. Steam Generator #1 downcomer valve position is 80% and is opening slowly. Steam Generator #2 downcomer valve position is 70% and is opening slowly. Concerning the digital feedwater control system, which (if any) of the following automatic actions will occur?

A. Both Steam Generator #1 and Steam Generator #2 will go through swapover.
B. Only Steam Generator #1 will go through swapover.
C. No DFWCS automatic action will occur until 16.5% power is reached.
D. No DFWCS automatic action will occur until both Steam Generator downcomer valves are 80% open.

A

Answer: A

26
Q

Assume that all digital feedwater control system control input transmitters are in service. The plant is at 16.5% power. Power is slowly increasing. Steam Generator #1 downcomer valve position is 85% and is opening slowly. Steam Generator #2 downcomer valve position is 75% and is opening slowly. Concerning the digital feedwater control system, which (if any) of the following automatic actions will occur?

A. Both Steam Generators #1 and #2 will go through swapover.
B. Only Steam Generator #2 will go through swapover.
C. Only Steam Generator #1 will go through swapover.
D. No DFWCS automatic action will occur until both Steam Generator downcomer valves are 80% open.

A

Answer: A

27
Q

Unit 1 is operating at rated power DFWCS is in a normal line up (no transmitters in maintenance) RRS has Tavg selected to “average” If Tavg fails HIGH during a reactor trip, both DFWCS would…

A. prevent feeding of the Steam Generators.
B. be prevented from entering RTO.
C. feed at the maximum rate as permitted by RTO.
D. feed at the minimum rate as permitted by RTO.

A

Answer: C

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