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LOIT Questions > SBCS > Flashcards

SBCS Flashcards

1
Q

Unit 1 is at 100% power with all systems in a normal lineup.
Steam header pressure transmitter SGN-PT-1024 fails low.
Subsequently, the main turbine trips. With no operator action, what is the expected plant response?
A. All 8 SBCVs modulate open, then control steam flow, stabilizing around 55%.
B. All 8 SBCVs quick open, then control steam flow, stabilizing around 55%.
C. All 8 SBCVs quick open, then go fully closed a few seconds later.
D. All 8 SBCVs remain closed.

A

C

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2
Q

Unit 1 is at 100% power with all systems in a normal lineup.
The main turbine trips. SBCS is automatically maintaining steam header pressure.
Subsequently, steam header pressure transmitter SGN-PT-1027 fails low.
With no operator action, what is the expected plant response?
A. All currently open SBCVs will fail closed immediately.
B. All currently open SBCVs will fail closed after fifteen seconds.
C. All currently open SBCVs will modulate closed immediately.
D. All currently open SBCVs will modulate closed after fifteen seconds.

A

B

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3
Q

Unit 1 is at 100% power with all systems in a normal lineup.
The main turbine trips. SBCS is automatically maintaining steam header pressure.
Subsequently, steam header pressure transmitter SGN-PT-1024 fails low.
With no operator action, what is the expected plant response?
A. All currently open SBCVs will fail closed immediately.
B. All currently open SBCVs will fail closed after fifteen seconds.
C. All currently open SBCVs will modulate closed immediately.
D. All currently open SBCVs will modulate closed after fifteen seconds.

A

C

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4
Q

Which of the following instruments provides input to the generation of the SBCS valve permissive setpoint?
A. Pressurizer Pressure transmitter RCN-PT-100Y
B. Steam Generator #1 Steam Flow transmitter SGN-FT-1011
C. Reactor Regulating System Turbine Load Index
D. Steam Header Pressure transmitter SGN-PT-1027.

A

A

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5
Q

Which of the following instruments provides input to the generation of the SBCS valve modulation setpoint?
A. Pressurizer Pressure transmitter RCN-PT-100Y
B. Steam Generator #1 Steam Flow transmitter SGN-FT-1011
C. Reactor Regulating System Turbine Load Index
D. Steam Header Pressure transmitter SGN-PT-1024.

A

B

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6
Q

How does the turbine runback signal reach the EHC system?
A. Runback is generated by the Reactor Power Cutback system, processed by the Steam Bypass Control system, and sent to the EHC system.
B. Runback is generated by the Steam Bypass Control system, processed by the Reactor Power Cutback system, and sent to the EHC system.
C. Runback is generated by the Reactor Power Cutback system and sent to the EHC system.
D. Runback is generated by the Steam Bypass Control system and sent to the EHC system.

A

B

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7
Q

Unit 3 is at 100% power with all systems in a normal lineup.
Which of the following will cause an alarm on 4A12B, TURB BYPASS DEMAND?
A. Reactor Regulating System Turbine Load Index fails low.
B. Steam Generator @2 Flow Transmitter SGN-FT-1022 fails low
C. Pressurizer Pressure Transmitter RCN-PT-100Y fails low (not selected by PPCS)
D. NI Control Channel #1 fails low.

A

A

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8
Q

Unit 3 is at 100% power with all systems in a normal lineup.
The main condenser ‘A’ vacuum breaker water seal is lost, and condenser backpressure rises to 8 in HgA.
With no operator action, which statement correctly describes plant conditions after one minute?
A. The main turbine has tripped, and reactor power has stabilized around 55%
B. The main turbine has tripped, and reactor power has stabilized around 20%
C. The reactor has tripped on low steam generator water levels.
D. The reactor has tripped on high pressurizer pressure.

A

D

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9
Q

Unit 1 is at 100% power with all systems in a normal lineup.
The core is at 25 EFPD.
A grid disturbance causes a generator trip.
The RO notes that a reactor power cutback has occured, and Regulating Group 3 CEAs are stepping inward.
With no operator action, the RO should expect CEA motion to continue until:
A. TLI is less than 15%
B. Control Channel power is less than 50%
C. Tave is two degrees higher than Tref
D. Control Channel power is 2% higher than TLI

A

B

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10
Q

Unit 2 is at 100% power with all systems in a normal lineup.
What statement is correct concerning the turbine runback signal?
A. SBCS is currently sending a runback signal to the RPCB system, and will stop sending the signal when Control Channel power is less than 60%
B. SBCS is not currently sending a runback signal to the RPCB system. The signal will be sent to RPCB once TLI is less than 60%, and will stop when Tavg and steam pressure are sufficiently raised.
C. SBCS is currently sending a runback signal to the RPCB system. The signal will continue to be sent to RPCB until TLI is less than 60% and Tavg and steam pressure are sufficiently raised.
D. SBCS is not currently sending a runback signal to the RPCB system. The signal will be sent to RPCB once TLI is less than 60%, and will stop when Tavg and steam pressure are sufficiently lowered.

A

C

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11
Q

Unit 3 is at 100% power with all systems in a normal lineup.
The main turbine trips. All systems actuate as designed.
The CO notes the Steam Bypass Master Controller SGN-PIC-1010 has an output of 60%.
Steam Bypass Control Valve SGN-PV-1001 is currently ___(1)___, and Steam Bypass Control Valve SGN-PV-1003 is currently ___(2)____.
A. (1) fully open; (2) fully open
B. (1) fully open; (2) fully closed
C. (1) fully open; (2) throttled open
D. (1) throttled open; (2) fully closed

A

C

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12
Q

Unit 3 is at 100% power with all systems in a normal lineup.
The main turbine trips. All systems actuate as designed.
The CO notes the Steam Bypass Master Controller SGN-PIC-1010 has an output of 40%.
Steam Bypass Control Valve SGN-PV-1001 is currently ___(1)___, and Steam Bypass Control Valve SGN-PV-1003 is currently ___(2)____.
A. (1) fully open; (2) fully open
B. (1) fully open; (2) fully closed
C. (1) fully open; (2) throttled open
D. (1) throttled open; (2) fully closed

A

B

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13
Q

Unit 3 is at 100% power with all systems in a normal lineup.
Condenser backpressure is currently 4.5 in HgA due to environmental effects.
The main turbine trips. All systems actuate as designed.
On the trip, condenser backpressure rises to 6 in HgA, then lowers and stabilizes at 2 in HgA.
One minute later, the CO notes the Steam Bypass Master Controller SGN-PIC-1010 has an output of 90%.
Steam Bypass Control Valve SGN-PV-1001 is currently ___(1)___, and Steam Bypass Control Valve SGN-PV-1008 is currently ___(2)____.
A. (1) fully open; (2) fully open
B. (1) fully open; (2) fully closed
C. (1) fully open; (2) throttled open
D. (1) fully closed; (2) throttled open

A

D

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14
Q

Unit 2 is at 100% power with all systems in a normal lineup.
The reactor is manually tripped.
Which of the following SBCVs will quick open in response to the plant transient?
A. All 8 SBCVs
B. Group X SBCVs
C. Group Y SBCVs
D. No SBCVs will quick open

A

B

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15
Q

Unit 1 is at 40% power with all systems in a normal lineup.
The reactor is manually tripped.
Which of the following SBCVs will quick open in response to the plant transient?
A. All 8 SBCVs
B. Group X SBCVs
C. Group Y SBCVs
D. No SBCVs will quick open

A

D

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16
Q

Steam Bypass Control System develops signals for use by all of the following systems EXCEPT:
A. Reactor Regulating System
B. Reactor Power Cutback System
C. Digital Feedwater Control System
D. Control Element Drive Mechanism Control System

A

A

17
Q 
Permissive and quick-open valve power for Steam Bypass Control Valves is supplied by:
A.  NKN-D41
B.  NKN-D42
C.  NKN-D43
D.  PKA-M41
A

B

18
Q

Steam Bypass Control System receives signals from all of the following systems EXCEPT:
A. Reactor Regulating System
B. Reactor Power Cutback System
C. Digital Feedwater Control System
D. Control Element Drive Mechanism Control System

A

D

19
Q

Which of the following conditions will prevent Steam Bypass Control Valves from quick-opening?
A. Tavg signal from RRSfails high
B. NI Control Channel signal from RRS fails high
C. Steam Bypass Master Controller SGN-PIC-1010 in LOCAL-AUTO
D. Steam Header Pressure transmitter SGN-PT-1024 fails high.

A

C

20
Q

Unit 1 is at 100% power with all systems in a normal lineup.
Steam header pressure transmitter SGN-PT-1027 fails low.
Subsequently, the main turbine trips. With no operator action, what is the expected plant response?
A. All 8 SBCVs modulate open, then control steam flow, stabilizing around 55%.
B. All 8 SBCVs quick open, then control steam flow, stabilizing around 55%.
C. All 8 SBCVs quick open, then go fully closed a few seconds later.
D. All 8 SBCVs remain closed.

A

C

21
Q

What limitations are associated with using manual permissives on steam bypass control valves with the master controller SGN-PIC-1010 in AUTO?

A

To minimize the effects of a single SBCS component failure possibly causing the
inadvertent opening of more than one steam bypass valve, only one steam bypass
valve should be placed in Automatic with a manual permissive.

22
Q

Unit 1 is at 100% power with all systems in a normal lineup.
Steam header pressure transmitter SGN-PT-1027 fails high.
Which of the following control room alarms will alert the control room staff of this failure?
A. Turbine Bypass Demand
B. Automatic Withdrawal Prohibit
C. Automatic Motion Inhibit
D. CEA Withdrawal Prohibit

A

A

23
Q

Which of the following conditions would prevent ALL steam bypass control valves from quick-opening?
A. Reactor Regulating System Tavg failed low
B. Reactor Trip
C. Condenser backpressure rises to 8 in HgA
D. Feed pump suction pressure lowers to 270 psig.

A

A

24
Q

SBCS master controller SGN-PIC-1010 output is sent to which of the following systems?
Steam Bypass Control System develops signals for use by all of the following systems EXCEPT:
A. Reactor Regulating System
B. Reactor Power Cutback System
C. Digital Feedwater Control System
D. Control Element Drive Mechanism Control System

A

C

LOIT Questions (86 decks)

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