P-Signals

P-Signals

P-4: Reactor Trip
1. Purpose: Protection Grade Signal
2. Setpoint: Reactor Trip Breakers Open
3. Coincidence: Train associated trip breaker and bypass breaker open or not connected.
4. Notes: Performs the following:
  1. Activates Main Turbine Trip
  2. Will generate FW Isolation signal if Tave below low Tave setpoint of 564 deg F (processed by SSPS)
  3. Blocks auto re-actuation of SI after manually resetting SI (processed by SSPS)
  4. Seals in FW Isolation signal due to SI or HI-HI S/G level (P-14) (processed by SSPS)
  5. Arms Steam Dumps to allow operation in Tave mode from Plant Trip Controller
P-6: SR Rx Trip Block
1. Setpoint: > 10E-10 amps
2. Coincidence: 1/2 IR
3. Notes:
  1. Allows manual block of SR Hi Flux Trip (2/2 block switches)
  2. Block switches also de-energize SR Hi Volts
  3. When <10E-10 amps on 2/2 channels then:
    1. SR Hi Volts re-energized
    2. SR trip and Flux doubling protection re-instated (occurs automatically)
P-7: At Power
1. Setpoint: None
2. Coincidence: P-10 or P-13 met
3. Notes: The following Rx Trips are re-instated with P-7 met (blocked when not met):
  1. PZR Lo Pressure
  2. PZR Hi Level
  3. RCP Undervoltage
  4. RCP Underfrequency
  5. Low Flow in 2 RCS Loops
P-8: 3 Loop Flow
1. Setpoint: > 48%
2. Coincidence: 2/4 PR Channels
3. Notes: Allows Rx trip when low flow condition is sensed
  1. On 2/3 channels for 1 RCS loop
  2. Auto blocked when 2/4 channels < 48%
P-9: Turbine Trip
1. Setpoint: > 50%
2. Coincidence: 2/4 PR Channels
3. Notes: When met, generates RX Trip if Turbine Trip occurs
  1. Auto blocked when < 50% on 3/4 PR channels
P-10: Nuclear At Power
1. Setpoint: > 10%
2. Coincidence: 2/4 PR Channels
3. Notes: When met, it performs the following:
  1. Feeds P-7
  2. Auto blocks SR Trip and de-energizes SR Hi Volts
  3. Allows blocking of IR Trip and C-1
  4. Allows blocking of PR Trip (Low setpoint)
  5. SR Hi Flux at S/D annunciator and CTMT Evacuation alarm defeated
4. Notes: When 3/4 PR channels < 10% the following are auto re-instated:
  1. IR Trip
  2. C-1
  3. PR Trip (Low setpoint)
  4. Removes permissive to P-7
P-11: PZR SI Block
1. Setpoint: < 1960 psig
2. Coincidence: 2/3 PZR Pressure Channels
3. Notes: When met allows manual blocking of:
  1. Low PZR Pressure SI
  2. Low Steamline Pressure SI, once blocked the Neg Steam Line P Hi Rate is armed
4. Notes: Once PZR P > 1960 psig on 2/3 channels then:
  1. Low PZR SI blocked, Open signal to SI Accum Isol Valves
  2. Low Steamline P armed, Neg SL P Hi Rate blocked, Open signal to SI Accum Isol Valves
P-12: Lo-Lo Tave
1. Setpoint: 553 deg F
2. Coincidence: 2/4 Channels
3. Notes: When met:
  1. Auto closes all steam dump valves
  2. 3 Cooldown steam dump valves may be opened by bypass switch
P-13: Turbine At Power
1. Setpoint: Turbine PWR > 10% RTP
2. Coincidence: 1/2 Turbine Impulse P Channels
3. Notes: When met:
  1. Feeds P-7
  2. Auto removes signal to P-7 when no longer met
P-14: S/G Hi-Hi Level
1. Purpose: Protection
2. Setpoint: 84% (U1) / 81.5% (U2)
3. Coincidence: 2/3 detectors on any 1 S/G
4. Notes: When met performs the following:
  1. Trips MFPs
  2. Trips Main Turbine
  3. Generates Main FW Isolation signal

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	Created by Lauren Neuburger over 7 years ago