P-Signals & C-Signals

Question 1

P-4

→What is it?
→Setpoint
→Coincidence

Answer 1

→reactor trip (Protection Grade signal)
→Setpoint: reactor trip breakers open
→Coincidence: train associated trip breaker AND bypass breaker open or not connected

Question 2

P-4

What does it do?

Question 3

P-6

→What is it?
→Setpoint
→Coincidence

Answer 3

→source range reactor trip block permissive
→Setpoint: >10^-10 amps
→Coincidence: 1/2 IR

Question 4

P-6

What does it do?

Question 5

P-7

→What is it?
→Setpoint
→Coincidence

Answer 5

→at power permissive
→Setpoint: none
→Coincidence: P-10 or P-13 met

Question 6

P-7

What does it do?

Question 7

P-8

→What is it?
→Setpoint
→Coincidence

Answer 7

→3 loop flow permissive
→Setpoint: >48%
→Coincidence: 2/4 PR channels

Question 8

P-8

What does it do?

Question 9

P-9

→What is it?
→Setpoint
→Coincidence

Answer 9

→turbine trip permissive
→Setpoint: >50%
→Coincidence: 2/4 PR channels

Question 10

P-9

What does it do?

Question 11

P-10

→What is it?
→Setpoint
→Coincidence

Answer 11

→nuclear at power permissive
→Setpoint: >10%
→Coincidence: 2/4 PR channels

Question 12

P-10

What does it do?

Question 13

P-11

→What is it?
→Setpoint
→Coincidence

Answer 13

→PZR SI block permissive
→Setpoint: <1960 psig
→Coincidence: 2/3 protection channels

Question 14

P-11

What does it do?

Question 15

P-12

→What is it?
→Setpoint
→Coincidence

Answer 15

→Lo-Lo T-avg permissive
→Setpoint: 553 deg F
→Coincidence: 2/4 channels

Question 16

P-12

What does it do?

Question 17

P-13

→What is it?
→Setpoint
→Coincidence

Answer 17

→turbine at power permissive
→Setpoint: turbine power > 10% (PT-505/506)
→Coincidence: 1/2 turbine impulse pressure channels

Question 18

P-13

What does it do?

Question 19

P-14

→What is it?
→Setpoint
→Coincidence

Answer 19

→S/G Hi-Hi Level (Protection)
→Setpoint: U1 84%, U2 81.5%
→Coincidence: 2/3 detectors on any 1 S/G

Question 20

P-14

What does it do?

Question 21

C-1

→What is it?
→Setpoint
→Coincidence

Answer 21

→IR Rod Stop (prevent reaching IR & PR Hi flux trips)
→Setpoint: IR amps ≈ 20% PR
→Coincidence: 1/2 IR channels

Question 22

C-1

What does it do?

Question 23

C-2

→What is it?
→Setpoint
→Coincidence

Answer 23

→PR Rod Stop (prevent reaching PR hi flux trip)
→Setpoint: 103%
→Coincidence: 1/4 PR channels

Question 24

C-2

What does it do?

Question 25

C-3 →What is it? →Setpoint →Coincidence

Answer 25

→OTN16 Rod Stop & Turbine Runback →Setpoint: 3% < OTN16 Rx Trip setpoint →Coincidence: 2/4 N-16 channels

Question 26

C-3 What does it do?

Question 27

C-4 →What is it? →Setpoint →Coincidence

Answer 27

→OPN16 Rod Stop & Turbine Runback →Setpoint: 3% < OPN16 Rx Trip setpoint (>109%) →Coincidence: 2/4 N-16 channels

Question 28

C-4 What does it do?

Question 29

C-5 →What is it? →Setpoint →Coincidence

Answer 29

→Low Power Interlock →Setpoint: ≤ 15% turbine power →Coincidence: 1/1 from PT-505 or 506

Question 30

C-5 What does it do?

Question 31

C-7 →What is it? →Setpoint →Coincidence

Answer 31

→Loss of Load →Setpoint: 10% with time constant of 120 sec →Coincidence: based on turbine power load reduction

Question 32

C-7 What does it do?

Question 33

C-9 →What is it? →Setpoint →Coincidence

Answer 33

→Condenser Interlock →Setpoint: >12.3" Hg vacuum →Coincidence: Condenser vacuum plus 2/4 Circ Water Pump breakers closed "C-9, condenser's fine"

Question 34

C-9 What does it do?

Question 35

C-11 →What is it? →Setpoint →Coincidence

Answer 35

→Control Bank D Rod Withdrawal Limit →Setpoint: 223 steps →Coincidence: N/A

Question 36

C-11 What does it do?

Question 37

C-16 →What is it? →Setpoint →Coincidence

Answer 37

→Stop Turbine Loading (prevent excessive T-avg droop) →Setpoint: 553° F auctioneered low T-avg OR auctioneered low T-avg < T-ref by 20° F →Coincidence: N/A

Question 38

C-16 What does it do?

Question 39

C-20 →What is it? →Setpoint →Coincidence

Answer 39

→AMSAC →Setpoint: >40% turbine power, no TD →Coincidence: 2/2 from PT-505/506

Question 40

C-20 What does it do?