Protection Permissives Flashcards
Protection Permissives (P’s)
P-4 Rx Trip and Bypass Breakers
P-6 Intermediate Range
P-7 At Power
P-8 Power Range
P-9 Power Range
P-10 Power Range
P-11 Pressurizer Pressure
P-12 Tave
P-13 Turbine 1st Stage Pressure
P-14 S/G Level
P-4
Rx Trip & BYP Breakers: Open or NOT Racked In (setpoint), 2/2 either train (logic), (1) Block Auto SI Reset, (2) Trip Turbine Generator, (3) Input to FWI logic, (4) Input to Steam Dump Logic (logic)
P-6
Intermediate Range: >10 to the -4th % (setpoint), 1/2 (logic), Allow Block of SR Trip (permissive)
P-7
At Power: > P-10 or P-13 (setpoint), 1/2 (logic), Enable 7 at power Rx Trips (permissive)
P-8
Power Range: > 35% (setpoint), 2/4 (logic), Enable Single Loop Low Flow Trip (permissive)
P-9
Power Range: > 50% (setpoint), 2/4 (logic), Blocks Rx Trip on Turbine Trip above P-7 but below P-9
P-10
Power Range: > 10% (setpoint), 2/4 (logic), (1) Block SR Trip, (2) Allow Block of IR and PR Trip and IR Rod Stop, (3) Input to P-7 (permissive)
P-11
Pressurizer Pressure: < 1970 psig (setpoint), 2/3 (logic), (1) Allow Block of Prz Low Pressure and Steamline Low Pressure SI, (2) Open CLA isolation valve @ >P-11 (permissive)
P-12
Tave: < 540°F (setpoint), 2/4 (logic), Block Steam Dumps (permissive)
P-13
Turbine First Stage Pressure: > 10% load equivalent (setpoint), 1/2 PT’s (logic), Input to P-7 (permissive)
P-14
S/G Level: > 81% narrow range (setpoint), 2/3 on any S/G (logic), (1) FWI Signal, (2) Turbine First Out Alarm (permissive)