Reactor, MFP, and Turbine Trips

Question 1

List the Rx Trips

Answer 1

• SR High Flux
• IR High Flux
• PR High Flux, Low Setpoint
• PR High Flux, High Setpoint
• PR High Rate
• OTΔT
• OPΔT
• PZR High #
• PZR Low #
• PZR Level High
• RCS Loss of Flow
• RCP Busses UV
• RCP Busses UF
• RCP Breaker Position
• SGWL Lo-Lo
• SGWL Lo with Feed Flow < Steam Flow
• SI
• Turbine Trip

Question 2

List the “At Power” Rx Trips

Answer 2

• PZR Low #
• PZR Level High
• RCS Loss of Flow
• RCP Busses UV
• RCP Busses UF
• RCP Breaker Position

Question 3

SR High Flux Trip Coincidence, Setpoint, and Interlock

Answer 3

• 1/2 SR NI
• 9 x 10^4 CPS
• P-6

Question 4

IR High Flux Trip Coincidence, Setpoint, and Interlock

Answer 4

• 1/2 IR NI
• Current equivalent of 22.5% RTP (20)% RTP
• P-10

Question 5

PR High Flux Trip (Low) Coincidence, Setpoint, and Interlock

Answer 5

• 2/4 PR NI
• 20% RTP
• P-10

Question 6

PR High Flux Trip (High) Coincidence, Setpoint, and Interlock

Answer 6

• 2/4 PR NI
• 107% RTP
• No Interlock

Question 7

PR High Positive Rate Trip Coincidence, Setpoint, and Interlock

Answer 7

• 2/4 PR NI
• 4.5% rise in 2 seconds
• No Interlock

Question 8

OTΔT Trip Coincidence, Setpoint, and Interlock

Answer 8

• 2/4
• Variable Setpoint
• No Interlock

Question 9

OPΔT Trip Coincidence, Setpoint, and Interlock

Answer 9

• 2/4
• Variable Setpoint
• No Interlock

Question 10

PZR High # Trip Coincidence, Setpoint, and Interlock

Answer 10

• 2/4 # detectors
• 2385 #
• No Interlock

Question 11

PZR Low # Trip Coincidence, Setpoint, and Interlock

Answer 11

-2/4 detectors
- 1950#
- P-7 Interlock

Question 12

RCS Loss of Flow Coincidence, Setpoint, and Interlock

Answer 12

• 2/3 detectors on 1/4 loops (2/3 detectors on 2/4 loops)
• 91% (91%)
• > P-8 (< P-8, but > P-7)

Question 13

PZR High Water Level Coincidence, Setpoint, and Interlock

Answer 13

• 2/3 detectors
• 92%
• P-7 Interlock

Question 14

RCP Busses UV Trip Coincidence, Setpoint, and Interlock

Answer 14

• 1/2 on 2/4 busses
• 88 V
• P-7 Interlock

Question 15

RCP Busses UF Trip Coincidence, Setpoint, and Interlock

Answer 15

• 1/2 on 2/4 busses
• 58.2 Hz
• P-7 Interlock

Question 16

RCP Breaker Position Trip Coincidence, Setpoint, and Interlock

Answer 16

• 2/4
• Open Aux Switch
• P-7

Question 17

SGWL Lo-Lo Trip Coincidence, Setpoint, and Interlock

Answer 17

• 2/3 detectors on 1/4 SG’s
• 5 (22)%
• No Interlock

Question 18

SGWL Low with Feed Flow < Steam Flow Trip Coincidence, Setpoint, and Interlock

Answer 18

• 1/3 level detectors on 1/4 SG’s AND 1/2 flow detectors on same SG
• 15 (26)% AND 0.71E6 (1.47E6) lbm/hr
• No Interlock

Question 19

Turbine Trip Coincidence, Setpoint, and Interlock

Answer 19

• 2/3 pressure detectors OR 4/4 Stop Valves
• Auto stop oil pressure < 800# OR stop valves < 1%
• P-8 Interlock

Question 20

List the MFP Trips

Answer 20

• Manual
• Rx Trip
• SI
• Hi-Hi SGWL
• IOPS
• Thrust Bearing Wear
• Low Lube Oil Pressure
• Low Suction Pressure
• Low Condenser Vacuum
• Low Trip Header Pressure

Question 21

List Main Turbine Trips

Answer 21

Hardwired
- ATWS
- SI
- SGWL Hi-Hi
- Manual
- Overall Differential Trip
- IOPS
- Stator Water Cooling Loss
- Thrust Bearing Wear
- Unit Differential Wear
- Rx Trip
PLC
- Low Lube Oil Pressure
- Low Vacuum
- Low Control Oil Pressure
- Low Trip Header Pressure
- Loss of both DC power supplies
- Overspeed