Control Systems (Bill) Flashcards
- 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. Go to single element control
- 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. 560; ensure feed flow is not excessive.
- 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.
D. Feed at a maximum rate as permitted by RTO.
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
B. 1
- 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.
D. SBCS valves with AUTO PERMISSIVE would close quickly after 15 seconds.
- 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%
B. (1) Setback (2) not runback below 60%
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.
D. Modulation demand and Permissive met.
- 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.
D. A RPCB followed by LOWERING RCS pressure and temperature due to secondary power (STEAM DEMAND) being HIGHER than primary power.
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. Are able to respond, RRS and/or CEDMCS operator control module.
- 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. First reduce the LOAD LIMIT potentiometer until the LOAD LIMITING light comes on, then pick up load as necessary.
- 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.
B. CEAs should insert a few steps due to the Rate of Change circuit sensing a power error.
- 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. Pressurizer pressure will lower.
- 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.
B. AMI is generated, PLCS auto setpoint lowers.
- 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.
C. The SBCS valves receiving an auto permissive signal.
- 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.
C. Low PZR level, high PZR pressure, and electrical protection.