RPS: Reactor Protection System Flashcards
What is the RRS design basis?
Load Rejection of any magnitude
10% step change
5%/min ramp change
What does NNN-D12 provide for the RRS?
Power to RRS overall
Hot Leg instruments (Loop 1 and Loop 2)
Control Channel 2
What happens to the RRS if NNN-D12 is lost?
RRS loses power No input to CEDMCS = no auto rod control Tave signal to PLCS fails low (33%-lose letdown) Lose power to both Th instruments Lose power to TLI #2 Lose power to Control Channel #2
What does NNN-D11 provide for RRS?
Cold Leg instruments (Loop 1 and Loop 2)
Control Channel 1
What happens to the RRS if NNN-D11 is lost?
Lose power to both Tc instruments
Lose power to TLI #1
Lose power to Control Channel #1
You’ll get an AMI if selected to Average
How can you tell which Tave inputs are being used by the RRS in the Control Room?
Lights on B05 - if both are on the average of the Tave’s is being used
What is used by the RRS to develop Tref?
TLI - B06 1st stage pressure is not the input to RRS
Tref = 564F to 587F
Where can you read the two first stage pressure instruments (MTN-PT-11A/B) that input into the RRS for TLI?
At the RRS Test Cabinet
What is the TLI range for RRS?
0% - 125%
RRS can only use a 100% reading though. This results in a max Tref of 587F
How is the Temperature Error for the RRS generated?
Tave - Tref = Et
What function does the Lag Network serve for the RRS?
Gives higher amplification to a parameter that is rapidly changing. Adds stability to the temperature control loop
What Total Error in the RRS will generate a low insertion demand?
+ 3F
Resets at + 2.84F
What Total Error in the RRS will generate a withdraw demand?
- 3F
Resets at - 2.84F
What Total Error in the RRS will generate a high insertion demand?
+ 4.53F
What Total Error in the RRS will generate a high withdraw demand?
- 4.53F
However, rods will not withdraw in Auto at the high rate.
When reading a voltage at the RRS Test Panel, what must be done before selecting the desired input?
You must push the “Test Probe” button to verify the voltmeter reads zero.
What happens in RRS if Tc fails HIGH while selected to AVERAGE?
AWP AMI PLCS Setpoint to 52.6% RC Loop Temp HI Tave-Tref Hi-Lo
What happens in RRS if Tc fails HIGH while selected to the affected channel?
AWP Hi Rate Insertion Demand - rods go in if in AS PLCS Setpoint to 52.6% Possible Rx Trip on Low PZR Pressure Possible Rx Trip on Low SG Pressure Possible SIAS RC Loop Temp HI Tave-Tref Hi-Lo
What happens in RRS if Tc fails HIGH while selected to the unaffected channel?
AWP
RC Loop Temp HI
What happens in RRS if Tc fails LOW while selected to AVERAGE?
Tave-Tref Hi-Lo
AMI
PLCS Setpoint to 38%
What happens in RRS if Tc fails LOW while selected to the affected channel?
Tave-Tref Hi-Lo
PLCS Setpoint to 33%
High Withdraw Demand - at 100% usually ARO
What happens in RRS if Tc fails LOW while selected to the unaffected channel?
Light on the RRS Test Panel
What happens in RRS if Th fails HIGH while selected to AVERAGE?
Tave-Tref Hi-Lo RC Loop Temp HI AWP AMI PLCS Setpoint to 52.6%
What happens in RRS if Th fails HIGH while selected to the affected channel?
Tave-Tref Hi-Lo RC Loop Temp HI AWP High Insert Demand - rods go in if in AS PLCS Setpoint to 52.6% Possible Rx Trip on Low PZR Pressure Possible Rx Trip on Low SG Pressure Possible SIAS
