Reactor Trips

Question 1

List all 19 Reactor Trips.

Do NOT include coincidence, setpoints or interlocks

Answer 1

1. SR Hi Flux
2. IR Hi Flux Trip
3. PR Hi Flux, Low Setpoint
4. PR Hi Flux, High Setpoint
5. PR Hi Positive Rate
6. OTΔT
7. OPΔT
8. Pressurizer Pressure Low
9. Pressurizer Pressure High
10. Pressurizer Water Level High
11. RCS Loss of Flow
12. Undervoltage on RCP Buses
13. Underfrequency on RCP Buses
14. RCP Breaker Position
15. SG Water Level Low Low
16. SG Water Level Low with Feed Flow less than Steam Flow
17. Safety Injection
18. Turbine Trip
19. Manual

Question 2

What is the setpoint, coincidence and interlock for the SR Hi Flux Reactor Trip?

Answer 2

90,000 CPS ↑ on 1/2 SR NIs with a P-6 interlock

Question 3

What is the setpoint, coincidence and interlock for the IR Hi Flux Reactor Trip?

Answer 3

22.5 (20)% RTP ↑ on 1/2 IR NIs with a P-10 interlock

Question 4

What is the setpoint, coincidence and interlock for the PR Hi Flux, Low Setpoint Reactor Trip?

Answer 4

20% RTP ↑ on 2/4 PR NIs with a P-10 interlock

Question 5

What is the setpoint, coincidence and interlock for the PR Hi Flux, High Setpoint Reactor Trip?

Answer 5

107% RPT ↑ on 2/4 PR NIs with NO Interlock

Question 6

What is the setpoint, coincidence and interlock for the PR High positive rate Reactor Trip?

Answer 6

4.5% ↑ in 2 sec on 2/4 PR NIs with NO Interlock

Question 7

What is the setpoint, coincidence and interlock for the OTΔT Reactor Trip?

Answer 7

Variable setpoint on 2/4 with NO Interlock

Question 8

What is the setpoint, coincidence and interlock for the OPΔT Reactor Trip?

Answer 8

Variable setpoint on 2/4 with NO Interlock

Question 9

What is the setpoint, coincidence and interlock for the Pressurizer Pressure High Reactor Trip?

Answer 9

2385 psig ↑ on 2/4 Pressurizer Pressures with NO Interlock

Question 10

What is the setpoint, coincidence and interlock for the Pressurizer Pressure Low Reactor Trip?

Answer 10

1950 # ↓ on 2/4 Pressureizer Pressures with a P-7 Interlock

Question 11

What is the setpoint, coincidence and interlock for the Pressurizer Water Level High Reactor Trip?

Answer 11

92% ↑ on 2/3 pressurizer water levels with a P-7 Interlock

Question 12

What is the setpoint, coincidence and interlock for the RCS Loss of Flow Reactor Trip?

Answer 12

2/3 on 1/4 Loops at 91% if greater than P-8
or
2/3 on 2/4 Loops 91% ↓ if less than P-8 but greater than P-7

Question 13

What is the setpoint, coincidence and interlock for the Under Voltage Reactor Trip?

Answer 13

1/2 on 2/4 RCP Buses at 88V ↓ with a P-7 Interlock

Question 14

What is the setpoint, coincidence and interlock for the Under Frequency Reactor Trip?

Answer 14

1/2 on 2/4 RCP Buses at 58.2 Hz↓ with a P-7 Interlock

Question 15

What is the setpoint, coincidence and interlock for the RCP Breaker Position Reactor Trip?

Answer 15

2/4 Open Aux Switches with a P-7 Interlock

Question 16

What is the setpoint, coincidence and interlock for the SG Water Level Low Low Reactor Trip?

Answer 16

2/3 on 1/4 SG at 5%↓ for Unit 1 or 22% ↓ for Unit 2.

There are NO Interlocks

Question 17

What is the setpoint, coincidence and interlock for the SG Water Level Low with Feed Flow greater than Steam Flow Reactor Trip?

Answer 17

1/2 on 1/4 SG at 15%↓ for Unit 1 and 26% ↓ for Unit 2 WITH 1/2 on same SG Feed Flow Less than Feed flow by 0.71E6 lbm/hr for Unit 1 and 1.47E6 lbm/hr for Unit 2.

There are NO Interlocks.

Question 18

What is the setpoint, coincidence and interlock for the Safety Injection Reactor Trip?

Answer 18

Either Train of SI will cause a Reactor Trip and there are NO Interlocks

Question 19

What is the setpoint, coincidence and interlock for the Turbine Trip Reactor Trip?

Answer 19

2/3 Oil Press 800 psig ↓
OR
4/4 Stop Valves 1% ↓

With P-8 as an Interlock

Question 20

What are the 6 at power trips that are automatically blocked when lowering power and the P-10 status light goes out?

Answer 20

Pressurizer Pressure Low
Pressurizer Water Level High
RCS Loss of Flow
UV - RCP Buses
UF - RCP Buses
RCP Breaker Position