Permissives

Question 1

What are all The Permissives

Answer 1

P-4 Reactor Trip
P-6 Source Range
P-7 At Power
P-8 3 Loop Flow
P-9 Turbine Trip-Reactor Trip
P-10 Nuclear At Power
P-11 Pressure SI
P-12 Low-Low Tavg
P-13 Turbine at Power
P-14 S/G High Level

Question 2

P-4

Answer 2

Permissive:Reactor Trip
Setpoint: Rx Trip and Bypass Breakers Open
Coincidence:
Function: Trips Main Turbine, Feedwater ISO with low Tavg (564F), Prevents Re-Actuation of SI after Reset, Transfers Steam dumps from Load Reject to Plant Trip, Arms Steam Dumps

Question 3

P-6

Answer 3

Permissive: Source Range
Setpoint: IR>10^-10 Amps
Coincidence: 1 of 2 IR
Function: Permits Block of Source Range trip on High Voltage

Question 4

P-7

Answer 4

Permissive: At Power
Setpoint: P-10 or P-13
Coincidence: 1 of 2
Function: Unblocks Pressurizer Low Pressure, Pressurizer High Level, Low Flow in > 1 loop, and RCP undervoltage and underfrequency

Question 5

P-8

Answer 5

Permissive: 3 Loop Flow
Setpoint: PR>48%
Coincidence: 2 of 4
Function: Unblocks low flow in 1 loop trip

Question 6

P-9

Answer 6

Permissive: Turbine Trip on Reactor Trip
Setpoint: PR>50%
Coincidence: 2 of 4
Function: Unblocks Reactor Trip on Turbine Trip

Question 7

P-10

Answer 7

Permissive: Nuclear at Power
Setpoint: PR>10%
Coincidence: 2 of 4
Function: Feeds P-7, Blocks Source Range High Voltage, Permits Block of IR Trip, IR Rod Stop, and PR low setpoint trip.

Question 8

P-11

Answer 8

Permissive: Pressure SI
Setpoint: <1970 psig
Coincidence: 2 of 3
Function: Permits block of pressurizer low pressure SI and Low steam line pressure SI/SLIS. This enables Steam Line Iso on high negative pressure rate

Question 9

P-12

Answer 9

Permissive: Low-Low Tavg
Setpoint: 550F
Coincidence: 2 of 4
Function: Blocks Steam Dumps

Question 10

P-13

Answer 10

Permissive: Turbine at Power
Setpoint: Pimp>10%
Coincidence: 1 of 2
Function: Feeds P-7

Question 11

P-14

Answer 11

Permissive: Steam Generator Hi Level
Setpoint: Level >91%
Coincidence: 2 of 4 on any 1 of 4 steam generators
Function: Trips Main Feed Pumps, Trips Main Turbine, FWIS