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.JS Sim Phase USE THIS > Control Systems (Bill) > Flashcards

Control Systems (Bill) Flashcards

1
Q
  • Unit 2 is at 100% power.
  • Both DFWCS are in normal lineup.
  • Feedwater Flow Transmitter (SGN-FT-1112X) fails low.
    What impact will this failure have on DFWCS #1?

DFWCS #1 will immediately…

A. Go to single element control
B. Raise its master controller output
C. Fully close its downcomer control valve
D. Reduce the speed of both MFPs

A

A. Go to single element control

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2
Q
  • The Reactor has tripped.
  • The SPTAs are in progress.
  • The RCPs were secured due to a loss of subcooling.
  • The Control Operator (CO) is performing the RCS Heat Removal step of the SPTAs.
  • DFWCS is currently operating in RTO.

If the Tc reported to the Control Room Supervisor (CRS) is below __F, the operator should __.

A. 560; ensure feed flow is not excessive.
B. 560; open Atmospheric Dump Valves (ADVs).
C. 564; ensure feed flow is not excessive.
D. 564; open Atmospheric Dump Valves (ADVs).

A

A. 560; ensure feed flow is not excessive.

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3
Q
  • Unit 1 is operating at 100% power.
  • RRS has Tavg selected to AVERAGE.

If Tavg fails HIGH during a reactor trip, both DFWCS would…

A. Be prevented from entering RTO.
B. Prevent feeding of the Steam Generators
C. Feed at a minimum rate as permitted by RTO.
D. Feed at a maximum rate as permitted by RTO.

A

D. Feed at a maximum rate as permitted by RTO.

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4
Q

While performing NORMAL OPERATION with SBCS, how many (if any) SBCS valves may have a manual permissive inserted with the valve in AUTOMATIC?

A. 0
B. 1
C. 2
D. 8

A

B. 1

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5
Q
  • Unit 2 is at 12% power and stable.
  • RCS Tc is 565F and stable.
  • The Operating Crew is preparing to synchronize the Main Generator to the grid.
  • Steam Bypass Control System (SBCS) is aligned is accordance with 40OP-9SF05, Operation of the Steam Bypass Control System and is maintaining approximately equal loading to each Condenser Shell.

If Main Steam Header Pressure transmitter, SGN-PT-1027, fails LOW, __.

A. ALL SBCS valves would close IMMEDIATELY.
B. ALL SBCS valves would close quickly after 15 seconds.
C. SBCS valves with AUTO PERMISSIVE would close IMMEDIATELY.
D. SBCS valves with AUTO PERMISSIVE would close quickly after 15 seconds.

A

D. SBCS valves with AUTO PERMISSIVE would close quickly after 15 seconds.

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6
Q
  • Unit 1 is at 100% power.
  • RPCS is in service with subgroups 4, 5, and 22 selected.
  • The ‘A’ Main Feed Pump trips.
  • In an unrelated failure, the Main Steam Header Pressure Transmitter (SGN-PT-1024) fails HIGH.

Based on this, the Reactor Power Cutback System will drop the selected CEAs and the Main Turbine will (1) and (2).

A. (1) Setback (2) Continuously runback
B. (1) Setback (2) not runback below 60%
C. (1) Not Setback (2) Continuously runback
D. (1) Not Setback (2) Not Runback below 60%

A

B. (1) Setback (2) not runback below 60%

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7
Q

Which of the following conditions are required for the Steam Bypass Control System (SBCS) to generate an Automatic Withdrawal Prohibit (AWP) signal to CEDMCS?

A. Tavg > 573.5F
B. Quick Open Block Group X.
C. Quick Open Block Group Y.
D. Modulation demand and Permissive met.

A

D. Modulation demand and Permissive met.

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8
Q
  • Unit 1 is at 250 EFPD.
  • Unit 1 is at 100% power.
  • NNN-D12 de-energizes due to a fault.
    Subsequently:
  • ‘B’ MFP Trips.

A. Normal Plant Stabilization following a manual RPCB.
B. Normal Plant Stabilization following an automatic RPCB.
C. A RPCB followed by RISING RCS pressure and temperature due to secondary power (STEAM DEMAND) being LOWER than primary power.
D. A RPCB followed by LOWERING RCS pressure and temperature due to secondary power (STEAM DEMAND) being HIGHER than primary power.

A

D. A RPCB followed by LOWERING RCS pressure and temperature due to secondary power (STEAM DEMAND) being HIGHER than primary power.

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9
Q

The RPCB signal is only present for a short period of time following the RPCB, after this time, the dropped CEAs __ to the __.

A. Are able to respond, RRS and/or CEDMCS operator control module.
B. Are able to respond, RRS but not CEDMCS operator control module.
C. Are not able to respond, RRS and/or CEDMCS operator control module.
D. Are not able to respond, RRS but will respond to the CEDMCS operator control module.

A

A. Are able to respond, RRS and/or CEDMCS operator control module.

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10
Q
  • A RPCB due to a Loss of Feed Pump has just occurred.
  • The Operating Crew desires to pick up load on the Main Turbine.

In order to accomplish this, the Secondary Operator must…

A. First reduce the LOAD LIMIT potentiometer until the LOAD LIMITING light comes on, then pick up load as necessary.
B. Reduce turbine load below 15% to clear the SETBACK, then raise load as desired using the LOAD LIMIT potentiometer.
C. Simply raise the setting of the LOAD LIMIT potentiometer, since the setting of this control follows the SETBACK and RUNBACK down.
D. Must perform this manipulation with the LOAD SET pushbutton since the LOAD LIMIT potentiometer is out of the circuit until the original (pre-rejection) load has been established.

A

A. First reduce the LOAD LIMIT potentiometer until the LOAD LIMITING light comes on, then pick up load as necessary.

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11
Q
  • CEDMCS in Auto Sequential.
  • Group 5 CEAs are 140 inches withdrawn.
  • RRS is selected to Control Channel 1.
  • UIC-1, Control Channel, fails HIGH.

Which of the following describes the RRS response?

A. No CEA motion will occur due to an AMI being generated.
B. CEAs should insert a few steps due to the Rate of Change circuit sensing a power error.
C. CEAs should withdraw a few steps due to the Rate of Change circuit sensing a power error.
D. No CEA motion will occur due to the Rate of Change circuit eliminating the effects of the instrument failure.

A

B. CEAs should insert a few steps due to the Rate of Change circuit sensing a power error.

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12
Q
  • Unit 1 is at 50% power.
  • RRS is selected to Tavg 2.
  • Loop 1 Tcold (RCN-TI-111Y) indicates 564F.
  • Loop 2 Tcold (RCN-TI-121Y) indicates 650F.
  • Loop 1 and 2 Thot (RCN-TI-111X and 121X) indicate 592F.
  • Board Annunciators in alarm:
    • Tavg/Tref Hi-Lo
    • RC Loop Temp Hi
  • CEA high rate insertion demand indicator is lit.
  • CEA auto insertion occurring.
  • Turbine load matches Reactor Power.
  • NO operator actions are taken.

Which ONE of the following describes the plant response?

A. Pressurizer pressure will lower.
B. Pressurizer pressure will increase.
C. SBCS will runback the Main Turbine.
D. SBCS will receive a quick open block.

A

A. Pressurizer pressure will lower.

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13
Q
  • Unit 1 is at 50% power.
  • RRS Tavg is selected to AVERAGE.
  • Tcold loop 1 fails LOW.

Which ONE of the following describes RRS and PLCS response to this failure?

A. AMI is generated, PLCS auto setpoint rises.
B. AMI is generated, PLCS auto setpoint lowers.
C. AWP is generated, PLCS auto setpoint lowers.
D. AWP is generated, PLCS auto setpoint rises.

A

B. AMI is generated, PLCS auto setpoint lowers.

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14
Q
  • Unit 1 is operating at 100% power.
  • RCS pressure is 2250 psia.
  • Pressure control channel selector, RCN-HS-100 is positioned to ‘X’.
  • Pressurizer heater control level trip channel selector, RCN-HS-100-3 is selected to ‘BOTH’.

PZR pressure transmitter ‘100Y’ failing high will result in:

A. All pressurizer heaters energizing.
B. All pressurizer heaters de-energizing.
C. The SBCS valves receiving an auto permissive signal.
D. The SBCS valves receiving an auto modulation signal.

A

C. The SBCS valves receiving an auto permissive signal.

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15
Q
  • Unit 1 is at 100% power.
  • The Pressurizer is in Boron Equalization.
    Subsequently:
  • An Inadvertent SIAS ‘A’ occurs.
  • The Reactor Operator overrides and re-energizes the Train A PZR backup heater.

Which ONE of the following heater trips will function on the Train A PZR backup heater?

A. Low PZR level and electrical protection ONLY.
B. High PZR pressure and electrical protection ONLY.
C. Low PZR level, high PZR pressure, and electrical protection.
D. High PZR level, low PZR pressure, and electrical protection.

A

C. Low PZR level, high PZR pressure, and electrical protection.

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16
Q
  • Unit 2 is at 100% power.
  • RCN-LIC-110, PLCS Master Controller, is in Remote-Auto.
  • RCN-HS-100, Level Control Selector Switch, is selected to ‘X’.
  • RCA-LT-110X, Pressurizer Level Transmitter, develops a leak in its WET REFERENCE LEG causing a deviation of 35% from actual Pressurizer level.

Based on the above conditions and NO OPERATOR ACTION, Letdown flow will..

A. Lower to 0 gpm.
B. Remain unchanged.
C. Rise to 135 gpm and stabalize.
D. Lower to 30 gpm and stabilize.

A

A. Lower to 0 gpm.

NOTE- Believe C is also a correct answer

17
Q
  • PLCS Master Controller, RCN-LIC-110, is in Remote-Manual.
  • Pressurizer Level is being maintained at approximately 52%.
  • The Pressurizer Level Control selector switch, RCN-HS-110, is in the CH-X position.
  • RRS is aligned to Average Tavg.
  • RCN-TT-111X (Thot) input into the RRS fails LOW.

Which of the following describes an expected response of the PLCS/PPCS?

A. All backup heaters energize.
B. The standby charging pump starts.
C. The letdown control valves throttles closed.
D. The pressurizer pressure master controller, RCN-PIC-100, output lower.

A

A. All backup heaters energize.

18
Q

Which ONE of the following states how the CPC calculated value of LPD would change if a dilution was started as rods were inserted into the core?

LPD would…

A. rise and LPD margin will lower.
B. lower and LPD margin will rise.
C. remain the same and margin will remain constant.
D. lower and margin will initially remain constant and then lower.

A

A. rise and LPD margin will lower.

19
Q

Assume that the plant had been at steady state 100% power for several days and all COLSS inputs are operable and accurate. What is the effect on COLSS plant power if one T-cold instrument begins to to read 5F lower than actual?

A. The change WILL NOT be seen on the COLSS plant power meter on B04.
B. The COLSS plant power meter will immediately (within one minute) read higher than actual, and will remain there until the instrument is taken out of scan.
C. The COLSS plant power meter will immediately (Within one minute) read higher than actual, but within the following hour, plant power will return to its actual value.
D. The COLSS plant power meter will not immediately (within one minute) change, but within the following hour, plant power will rise to greater than its actual value and remain there until the instrument is taken out of scan.

A

C. The COLSS plant power meter will immediately (Within one minute) read higher than actual, but within the following hour, plant power will return to its actual value.

20
Q
  • Train ‘A’ CPIAS (RU-37 Power Access Purge Train A) is in BYPASS.
  • The TRIP and BYPASS lights are lite.
  • Maintenance informs the Control Room that work has been completed and that Train ‘A’ CPIAS can be returned to service.
  • The operator removing RU-37 from bypass, inadvertently turns the bypass key as the first procedure step taken.

Based on these conditions, how will the system respond?

A. Train ‘A’ CPIAS and a Train ‘A’ and ‘B’ CREFAS actuate.
B. Train ‘A’ and ‘B’ CPIAS and a Train ‘A’ and ‘B’ CREFAS actuate.
C. Trip and BYPASS lights to go out as the channel is restored to service.
D. BYPASS light to remain lit. as the channel will not come out of bypass in these conditions.

A

B. Train ‘A’ and ‘B’ CPIAS and a Train ‘A’ and ‘B’ CREFAS actuate.

21
Q

Which ONE of the following will cause the Reactor Regulating System to generate an Automatic Motion Inhibit (AMI)?

A. Tc=576F.
B. Tavg=587F with Tref=580.
C. Control Channel #1 at 99%, Control Channel #2 at 93%, RRS selected to Control Channel 2.
D. Control Channel #1 at 99%, Control Channel #2 at 93%, RRS selected to Average Control Channel.

A

D. Control Channel #1 at 99%, Control Channel #2 at 93%, RRS selected to Average Control Channel.

22
Q

Which of the following instrument/signal failures could impact feedwater flow with the Feedwater Control System in automatic at 10% power?

A. Steam Flow.
B. Feedwater Flow.
C. Turbine Load Index
D. Log Safety Channels

A

C. Turbine Load Index

NOTE: Uses TLI and SBCS Demand for Anticipatory

23
Q

What will prevent a quick open of ALL SBCS Vavles?

A. Reactor trip and low RCS Tave.
B. Reactor trip and high RCS Tave.
C. A loss of steam to a Main Feed Pump.
D. Any reactor trip, regardless of RCS Tave.

A

A. Reactor trip and low RCS Tave.

24
Q
  • Unit 1 is at 98% power.
  • SBCS valve testing (with steam flow) is beginning.
  • The Balance of Plant Operator (BOP) begins to OPEN SBCV 1006 while simultaneously reducing load on the turbine.
  • Total steam flow remains constant.
  • All CEAs are FULLY WITHDRAWN.

If CEDMCS is left in AUTO SEQUENTIAL, the Operating Crew should expect CEAs to…

A. Start stepping in.
B. Receive a withdraw signal (with no rod motion).
C. Remain in their present position due to an AMI.
D. Remain in their present position due to an AWP.

A

A. Start stepping in.

25
Q
  • Unit 1 is at 100% power.
  • A Regulating Group 5 CEA has been determined to be UNTRIPPABLE (STUCK).
  • The Operating Crew is reviewing the Tech Specs associated with this problem.
  • While they are performing this, a trip of the ‘B’ Main Feedwater Pump occurs.

Based on this, which of the following describes how the plant will respond?

A. Normal RPCB will occur ONLY.
B. The reactor will trip immediately.
C. The reactor will trip after approximately 30 seconds.
D. Normal RPCB will occur and a building penalty factor will lead to a reactor trip after approximately 10 minutes.

A

B. The reactor will trip immediately.

26
Q
  • The Unit is at 100% power.
  • RRS Tave is selected to LOOP 1 due to an instrument malfunction in Loop 2.
  • RRS TLI and NI Power are both selected to AVERAGE.
  • Loop 1 Tcold (RCN-TT-111Y) fails HIGH.
  • The Reactor trips due to a Plant Protection System malfunction.

Based on the conditions above, a Quick Open Block will..

A. Occur on Group X and Y Steam Bypass Control Valves.
B. Occur on Group Y Steam Bypass Control Valves ONLY.
C. Occur on Group X Steam Bypass Control Valves ONLY.
D. Not occur on either Group X or Group Y Steam Bypass Control Valves.

A

B. Occur on Group Y Steam Bypass Control Valves ONLY.

27
Q
  • Unit 1 is operating at 100% power.
  • Pressurizer pressure is 2285 psia.
  • RCN-HS-100, The Pressure Control Channel Selector switch is positioned to ‘X’.
  • Pressure Transmitter RCN-PT-100Y has failed LOW.

Which of the following is true?

The SBCS…

A. Master controller must be taken to manual to open the SBCS valves.
B. Individual valve controllers must be taken to manual to open the SBCS valves.
C. Permissive setpoint will NOT lower due to pressure transmitter RCN-PT-100Y failing low.
D. Manual Permissives must be inserted to open the SBCS valves to maintain normal pressure.

A

C. Permissive setpoint will NOT lower due to pressure transmitter RCN-PT-100Y failing low.

28
Q
  • Unit 1 is stable at 60% following a Large Load Reject.

What is necessary to reset the AMI that is sealed in?

A. TLI > 15%
B. AWP has cleared
C. A CEA withdrawal signal from RRS
D. RPCB system has been removed from service

A

C. A CEA withdrawal signal from RRS

29
Q
  • A main turbine trip 30 minutes ago.
  • Reactor power stabilized as expected.
  • The SBCS is in Remote-Automatic.
  • The RO now reports that SBCVs 1003 and 1006 are slowly going closed.
  • T-cold has remained relatively constant.
  • Reactor power remains constant.

Which of the following events or malfunctions are in progress?

A. A slipped CEA
B. A small steam leak downstream of the MSIVs
C. Steam flow detector SGN-FT-1012 has failed high.
D. Pressurizer pressure instrument RCN-PT-100Y has failed high.

A

B. A small steam leak downstream of the MSIVs

30
Q

Which of the following conditions will cause the SBCS valves to modulate open at a lower steam pressure?

A. Pressurizer spray valve sticks open.
B. Group X1 and Y1 receive a quick open signal.
C. PPCS Master Controller (RCN-PIC-100) output fails to 0%.
D. Steam Header pressure transmitter (SGN-PT-1027) Fails high.

A

C. PPCS Master Controller (RCN-PIC-100) output fails to 0%.

31
Q

A Reactor Power Cutback occurs in response to a loss of a Main Feedwater Pump.

The cutback signal is generated by Main Feedwater Pump (1) and the associated turbine setback signal will lower turbine load (2).

A. (1) control oil pressure lowering to 75 psig. (2) at 480%/min to ~60% turbine load.
B. (1) control oil pressure lowering to 75 psig. (2) at 130%/min to match turbinen power with reactor power.
C. (1) discharge flow lowering to 8% below setpoint. (2) at 480%/min to ~60% turbine load.
D. (1) discharge flow lowering to 8% below setpoint. (2) at 130%/min to match turbine power with reactor power.

A

A. (1) control oil pressure lowering to 75 psig. (2) at 480%/min to ~60% turbine load.

32
Q
  • Unit 3 is at 100% power.
  • The following alarms and indications are observed in the Control Room:
    • AWP (4A09A) in fast flash.
    • REAC PWR CUTBACK SYS TRBL (4A11A) in fast flash)
    • TURB BYP DEMAND (4A12B) in fast flash.
    • MN TURB TRIP (6B02A) in fast flash.
  • All available steam bypass valves are full OPEN.
  • Pressurizer pressure is 2255 psia and rapidly RISING.
  • Tcold is 555F and rapidly RISING.
  • Group 5 rods are at 138 inches and driving IN.

Which ONE of the following operator actions should be taken?

A. Manually initiate a ‘feed pump’ trip Reactor Power Cutback.
B. Manually initiate a ‘large load reject’ Reactor Power Cutback.
C. Initiate maximum boration using all available charging pumps.
D. Place Steam Bypass Control System into emergency off and control secondary pressure with ADVs.

A

B. Manually initiate a ‘large load reject’ Reactor Power Cutback.

33
Q
  • Unit 1 is at 100% power.
  • A loss of NNN-D15 occurs.
  • RPCB did NOT occur automatically.
  • The BOP manually trips the ‘A’ MFP, resulting in a RPCB.

Why did the RPCB system not auto actuate upon the loss of NNN-D15?

A. RPCB module lost power.
B. MFP speed sensors lost power.
C. MFP governor position signal failed.
D. MFP control oil pressure remained normal.

A

D. MFP control oil pressure remained normal.

34
Q

Which ONE of the following describes the condition (s) required for a Reactor Power Cutback (RPCB)?

A. Loss of power to NNN-D15
B. Loss of power to NNN-D16
C. Two control oil pressure switches on ONE MFP less than 75 psig.
D. Once control oil pressure switch on BOTH MFPs less than 75 psig.

A

C. Two control oil pressure switches on ONE MFP less than 75 psig.

35
Q

What signal does the Reactor Power Cutback system receive from the Main Feedwater Pumps?

A. Turbine Speed.
B. Control Oil pressure.
C. Steam Inlet Valve position.
D. Pump Discharge pressure.

A

B. Control Oil pressure.

.JS Sim Phase USE THIS (19 decks)

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