Protection Permissives

Question 1

Protection Permissives (P’s)

Answer 1

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

Question 2

P-4

Answer 2

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)

Question 3

P-6

Answer 3

Intermediate Range: >10 to the -4th % (setpoint), 1/2 (logic), Allow Block of SR Trip (permissive)

Question 4

P-7

Answer 4

At Power: > P-10 or P-13 (setpoint), 1/2 (logic), Enable 7 at power Rx Trips (permissive)

Question 5

P-8

Answer 5

Power Range: > 35% (setpoint), 2/4 (logic), Enable Single Loop Low Flow Trip (permissive)

Question 6

P-9

Answer 6

Power Range: > 50% (setpoint), 2/4 (logic), Blocks Rx Trip on Turbine Trip above P-7 but below P-9

Question 7

P-10

Answer 7

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)

Question 8

P-11

Answer 8

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)

Question 9

P-12

Answer 9

Tave: < 540°F (setpoint), 2/4 (logic), Block Steam Dumps (permissive)

Question 10

P-13

Answer 10

Turbine First Stage Pressure: > 10% load equivalent (setpoint), 1/2 PT’s (logic), Input to P-7 (permissive)

Question 11

P-14

Answer 11

S/G Level: > 81% narrow range (setpoint), 2/3 on any S/G (logic), (1) FWI Signal, (2) Turbine First Out Alarm (permissive)