Pressurizer Level Control Flashcards
What determines the setpoint for pressurizer level when in Remote on the controller?
when in local?
Tave
set manually on controller by operator
what level is the pressurizer maintained to by PLCS when in remote/auto on the controller?
33% - 53%
What are the tech spec level limits for the pressurizer (in %)?
27% - 56%
What does LIC - 110 controller provide control of?
R/L switch is associated with charging pump and backup heater ops
auto/manual is associated with letdown control valves
What is the level deviation program for auto starting/stopping components?
+15% and rising - norm running CHP secures
+14% and lowering - norm running CHP starts
+3% deviation and rising - backup heaters start
+2.5% deviation and lowering - backup heaters secure
-14% and rising - standby pump secures
-23% and lowering - standby pump starts
At what Pzr level do all heaters secure?
25% level
What are the parameters for PLCS Tave developing a level setpoint to input to the level controller?
568F - 586F (Tave) = 33% - 53.6% (PZR lvl) (15-100% Rx power)
available volume is optimized by level program and ramped linearly
(Hockey stick graph)
What are the flow limits when the Pzr level controller is in Auto?
Manual?
30-135 gpm
0-150 gpm
While in Auto, PLCS controls what components?
charging pumps and letdown control valves
backup heaters
Where do the pressurizer level transmitters get power from?
What supplies power to downstream Level transmitters?
Which level transmitter also provides signal to Post-Accident Monitoring?
RCA-LT-110X - PNA-D25
RCB-LT-110Y - PNA-D26
LT-110X - NNN-D12
LT-110Y - NNN-D11
RCA-LR-110X
On a loss of Instrument air, what happens to the letdown control valves?
How is Pzr level maintained?
fail closed
manually controlling charging pumps
Regarding the Auto - After - Start/Stop HS positions, when does the PLCS control charging pumps?
Auto - After- Stop ONLY
When Charging pumps are in Auto-After-Start, what will trip the Charging pumps?
electrical protection
Low suction pressure - 13 psia
What are the important pressure setpoints associated with RCS/Pzr?
2750 - RCS Safety Limit
2500 - RCS design pressure
2475 - Pzr safeties lift
2409 - SPS (ATWS) Trip
2383 - High pressure Rx trip (PPS)
2300 - Main spray full open
2295 - DNB LCO
2285 - Pzr High pressure alarm reset, ALL heaters trip
2275 - Spray starts to open
2250 - NOP
2225 - proportional heaters at full power
2200 - backup heaters on
2160 - Pzr low pressure alarm
2130 - DNB LCO
1950(ish) - DBN Rx trip
1837 - SIAS / CIAS
What pressure differential will bring in the PZR TRBL alarm?
50 psid
