Permissives and Functions

P-3 ON

(RTCB open)

Permits manual block of all safeguards signals and reset of latched safeguards signals (signal persistent for > 60 sec)

Input to P-4

P-3 OFF

(RTCB closed)

Prevents manual reset of latched Safeguards signals, and removes block of unlatched Safeguards signals

P-4 ON

(Reactor Trip signal or P-3)

Causes Turbine Trip

w/ Tavg Low (550 F), causes Feedwater Isolation A

w/ Tavg Low 2 (525 F), causes Feedwater Isolation B

w/ SG NR Level High (66.8%), causes Feedwater Isolation C and CVS Makeup Isolation

Causes Boron Dilution Protection

Blocks Steam Dump load rejection control

Transfer Steam Dump to Press Control Mode

Actuates RTVO to SFW Control Valves and opens FWS-V097

P-4 OFF

(No Reactor Trip signal and No P-3)

Enables Steam Dump load rejection control

P-6 ON

(IR ≥ 1E-5%)

Manual block of SR Flux High (1 E5 CPS SR) → Reactor Trip

P-6 OFF

(IR < 1E-5%)

Auto unblock SR Flux High (1 E5 CPS SR) → Reactor Trip

Auto unblock SR Flux doubling (2.2x in 10 sec) → Boron Dilution Protection

Auto unblock SR Flux doubling (2.2x in 10 sec)→ CVS Makeup Isolation

P-8 ON

(Tavg ≥ 551 F)

Manual block SR Flux doubling (2.2x in 10 sec) → Boron Dilution Protection

Manual block SR Flux doubling (2.2x in 10 sec) → CVS Makeup Isolation

P-8 OFF

(Tavg < 551 F)

Auto unblock SR Flux doubling (2.2x in 10 sec) → Boron Dilution Protection

Auto unblock SR Flux doubling (2.2x in 10 sec) → CVS Makeup Isolation

P-9 ON

(Tavg ≥ 200 F)

Auto unblock SG NR Level High 3 (76%) → Turbine Trip

Auto unblock SG NR Level High 3 (76%) → Feedwater Isolation ABC

Auto unblock SG NR Level High 3 (76%) → CVS Makeup Isolation

Auto unblock SG NR Level High (66.8%) w/ P-4 → CVS Makeup Isolation

Auto unblock SG NR Level High (66.8%) w/ P-4 → Feedwater Isolation C

Auto unblock SG NR Level Low 2 (21%) → Reactor Trip

Auto unblock SG NR Level Low 2 (21%) → SG Blowdown Isolation

Auto unblock SG NR Level Low 2 (21%) w/ SFW Flow Low 2 (200 gpm) → PRHR Actuation

Auto unblock SG WR Level Low 2 (35%) → PRHR Actuation

Auto unblock SG WR Level Low 2 (35%) w/ HL Temp High (636 F) → CMT Actuation

Auto unblock IRWST WR Level Low (96%) → Refueling Cavity Isolation

P-9 OFF

(Tavg < 200 F)

Manual block SG NR Level High 3 (76%) → Turbine Trip

Manual block SG NR Level High 3 (76%) → Feedwater Isolation ABC

Manual block SG NR Level High 3 (76%) → CVS Makeup Isolation

Manual block SG NR Level High (66.8%) w/ P-4 → Feedwater Isolation C

Manual block SG NR Level High (66.8%) w/ P-4 → CVS Makeup Isolation

Manual block SG NR Level Low 2 (21%) → Reactor Trip

Manual block SG NR Level Low 2 (21%) → SG Blowdown Isolation

Manual block SG NR Level Low 2 (21%) w/ SFW Flow Low 2 (200 gpm) → PRHR Actuation

Manual block SG WR Level Low 2 (35%) → PRHR Actuation

Manual block SG WR Level Low 2 (35%) w/ HL Temp High (636 F) → CMT Actuation

Manual block IRWST WR Level Low (96%) → Refueling Cavity Isolation

P-10 ON

(PR ≥ 10%)

Auto block SR Flux High (1 E5 CPS SR) → Reactor Trip

Manual block IR Flux High (25% IR) → Reactor Trip

Manual block PR Flux High (low setpoint) (25% PR) → Reactor Trip

Auto unblock PZR Level High 3 (66%) → Reactor Trip

Auto unblock PZR Press Low 2 (1955 psig) → Reactor Trip

Auto unblock Reactor Coolant Flow Rate (90%) → Reactor Trip

Auto unblock RCP Speed Low 2 (91%) → Reactor Trip

P-10 OFF

(PR < 10%)

Manual reset SR Flux High (1 E5 CPS SR) → Reactor Trip

Auto unblock IR Flux High (25% IR) → Reactor Trip

Auto unblock PR Flux High (low setpoint) (25% PR) → Reactor Trip

Auto block PZR Level High 3 (66%) → Reactor Trip

Auto block PZR Press Low 2 (1955 psig) → Reactor Trip

Auto block Reactor Coolant Flow Rate (90%) → Reactor Trip

Auto block RCP Speed Low 2 (91%) → Reactor Trip

P-11 ON

(PZR NR Press < 1970 psig)

Manual block SG NR Level High 3 (76%) → Reactor Trip

Manual block PZR Press Low 3 (1855 psig) → Safeguards Actuation

Manual block Steamline Press Low 2 (560.3 psig) → Safeguards Actuation

Manual block Low 3 (1855 psig) → Safeguards Actuation

P-11 OFF

(PZR NR Press ≥ 1970 psig)

Placeholder

P-12 ON

(PZR Level < 16%)

Manual block PZR Level Low (20%) → Aux Spray and Purification Isolation

Manual block PZR Level Low 2 (10%) → CMT Actuation

Auto unblock HL Level Low 2 (58.1%) → CVS Letdown Isolation

Manual unblock HL Level Low 4 (9.7%) → ADS 4 Actuation

P-12 OFF

(PZR Level ≥ 16%)

Auto unblock PZR Level Low (20%) → Aux Spray and Purification Isolation

Auto unblock PZR Level Low 2 (10%) → CMT Actuation

Manual block HL Level Low 2 (58.1%) → CVS Letdown Isolation

Auto block HL Level Low 4 (9.7%) → ADS 4 Actuation

P-17 ON

(PR Rate more negative than or equal to -15% RTP)

Auto block

• Auto and Manual rod withdrawal for both M and AO banks

• Auto AO rod insertion

P-17 OFF

(PR Rate less negative than -15% RTP)

Manual reset of P-17

P-19 ON

(RCS WR Press < 700 psig)

Manual block PZR Level High 3 (66%) → PRHR Actuation

Manual block PZR Level High 3 (66%) → PZR Heater Trip

Manual block PZR Level High 2 (55%) → CVS Makeup Isolation

P-19 OFF

(RCS WR Press ≥ 700 psig)

Auto unblock PZR Level High 3 (66%) → PRHR Actuation

Auto unblock PZR Level High 3 (66%) → PZR Heater Trip

Auto unblock PZR Level High 2 (55%) → CVS Makeup Isolation