Setpoints Turbine Trips Ps and Cs combined

C1

IR Flux >15% (2/4 and NOT blocked)

Blocks Auto and Manual Rod Withdrawal for:

• M Bank

• AO control Bank

Manually Blocked by >= P10

Auto Unblocked by <P10

C2

PR Flux >= 103%

Blocks Auto and Manual Rod withdrawal for:

• M banks

• AO control bank

C3

Margin to OT∆T Trip is =<1%

Turbine load suspended when =<3% Margin

2nd lowest of 4 inputs

3 input failures shift M/AO control to Man

Blocks Auto and Manual Rod withdrawal for:

• M banks

• AO control bank

Actuates Turbine runback to >1% (Target 0MW @ 1250MW/min)

C4

Margin to OP∆T Trip is =<1%

Turbine load suspended when =<3% Margin

2nd lowest of 4 inputs

3 input failures shift M/AO control to Man

Blocks Auto and Manual Rod withdrawal for:

• M banks

• AO control bank

Actuates Turbine runback to >1% (Target 0MW @ 1250MW/min)

C5

Turbine Power <15% (PLS Median select)

Blocks M Auto Withdrawal W/ NOT in Low power control (0-20% RTP)

Blocks AO Auto Withdrawal

Blocks AO Auto Insertion when CRE NOT in progress

C7

Load Reject >10% OR Load Reject Rate >5%/min

Arms Steam dumps W/ coincident with C9

C9

2 of 3 <9.5” HgA on 3/3 Condenser shells (Condenser Available)

Enables Steam dump valves Coincident W/:

• C7

• Steam Pressure Mode (P-4 (Rx trip request-2/4) OR Rods MG Set UV (2/4) OR Operator selected)

Low Power Rod control is blocked when Steam dumps disarmed

C10

Any DRPI <12 Steps

Rod Bottom alarm

(When position not demanded)

C11

M bank ≥150 steps

MA (last is sequence #1)

MD (last is sequence #2)

Blocks M bank Auto withdrawal

C15

AO Bank @ RIL per COLR

Blocks Auto AO bank auto IN when CRE NOT in progress

C16

Tavg Low-2 ≤552F OR Tavg-Tref ≤ -10F

Suspend Turbine Loading

C17

M Bank @ RIL per COLR

Blocks AO Bank auto OUT when CRE NOT in progress

C18

M Bank ≥140 Steps

Blocks AO auto IN when CRE NOT in progress

C19

AO bank @ 264 steps

Blocks AO auto/man OUT

C20

MFP Trip Turbine runback

If RTP ≥70% then:

• Turbine runback to 70% @ 200%/Min (2500MW/Min)

• RPR to 80% if ∆T power >90%

P3

Minimum amount of Rx Trip Bkrs open for Rx Trip

Permits Manual Block of ESF Auto actuation signals and Reset of ESF signals in for >60 Seconds

NOT P3

Enough Rx Trip Bkrs Closed to energizes CRDM bus

PREVENTS manual reset of ESF signals and removes block of unlatched ESF signals

P4

Rx Trip signal IN or P3 IN

• Coincident w/ TavgLow (550F), initiates FWS-A Isolation

• Coincident w/ TavgLow-2 (525F), initiates FWS-B Isolation

• Trips turbine (5 sec time delay)

• Actuates Boron Dilution Protection System (9 sec time delay)

• Coincident w/ SG NR Level High (66.8%), initiates FWS-C isolation and CVS M/U Isolation

• Blocks Steam dump load reject control

• Steam dump control in press. control mode

• Actuate RTVO to SFCV and opens FWS-V097)

Not P4

No Rx Trip signal and Not P3

Removes All P4 actuation signals

Enables Steam Dump load reject controller

P6

IR ≥ 1 E-5% Rx Power

Permits Manual Block of SR Flux Hi (E5-CPS) Rx Trip in that division. Permits Manual SR flux detectors De-energized to avoid burnout

Not P6

IR < 1 E-5% Rx Power

Divisional Auto Unblocks SR Flux Hi (E5-CPS) Reactor Trip and SR Flux doubling (SR X 2.2 in 10 sec) signal to boron dilution protection. Auto energization SR Hi volts supply

P8

RCS Tavg ≥551F

Allows manual block of SR Flux doubling (SR X 2.2 in 10 sec) input to Boron dilution

Not P8

RCS Tavg <551F

If SR Flux doubling (SR X 2.2 in 10 sec) Boron dilution block initiated below P8 then DWS isolation valves (DWS-V136A/B) Close

P9

Tavg ≥200F

Auto unblock of SG NR lvl Lo2 21% Rx Trip

Auto Unblocks the Following ESF Actuations:

• CMT Injection (SG WR Lvl Lo2 35% in BOTH SGs AND HL temp Hi 636F)

• PRHR (SG WR Lvl Lo2 35% in Either SG)

• PRHR (SG NR lvl Lo2 21% AND SFW Flow Lo2 200gpm)

• BlowDown Iso (SG NR lvl lo2 21% in associated SG)

• SFW Iso (SG NR Lvl Hi3 76%)

• MFW Iso (SG NR Lvl Hi3 76%)

• Turbine Trip (SG NR Lvl Hi3 76%)

• CVS Iso (SG NR Lvl Hi3 76%)

• CVS Iso (SG NR Lvl Hi 66.8% W/ P4)

• SFW Iso (SG NR Lvl Hi 66.8% W/ P4)

• SFW Auto Start

• Refueling Cavity Iso (IRWST WR Lvl Lo 96%)

Not P9

Tavg < 200F

Permits manual Block of SG NR Lvl Lo2 21% Rx Trip

Permits Manual Block of ALL P9 ESF AUTO Blocks

• CMT Injection (SG WR Lvl Lo2 35% in BOTH SGs AND HL temp Hi 636F)

• PRHR (SG WR Lvl Lo2 35% in Either SG)

• PRHR (SG NR lvl Lo2 21% AND SFW Flow Lo2 200gpm)

• BlowDown Iso (SG NR lvl lo2 21% in associated SG)

• SFW Iso (SG NR Lvl Hi3 76%)

• MFW Iso (SG NR Lvl Hi3 76%)

• Turbine Trip (SG NR Lvl Hi3 76%)

• CVS Iso (SG NR Lvl Hi3 76%)

• CVS Iso (SG NR Lvl Hi 66.8% W/ P4)

• SFW Iso (SG NR Lvl Hi 66.8% W/ P4)

• SFW Auto Start

• Refueling Cavity Iso (IRWST WR Lvl Lo 96%)

P10

PR Pwr is ≥10%

Permits Manual block of:

• PR Hi-Lo flux 25% Rx Trip

• IR Hi flux 25% Rx Trip

• IR Rod Stop (C1- IRNI > 15%)

Auto Blocks SR Hi flux 1E5-CPS Rx Trip

Auto Unblocks the following Rx trips:

• RCS flow lo2 90%

• RCP Speed lo2 91%

• PZR Press Lo2 1955psig

• PZR Lvl Hi3 66%

Auto De-energizes SR High Volts divisionally

NOT P10

PR Pwr <10%

Auto unblock of:

• PR Hi-Lo flux 25% Rx Trip

• IR Hi flux 25% Rx Trip

• IR Rod Stop (C1- IRNI > 15%)

Permits Manual RESET of SR Flux Hi 1 E5 CPS Rx trip signal

Auto Blocks following Rx trips:

• RCS flow lo2 90%

• RCP Speed lo2 91%

• PZR Press Lo2 1955psig

• PZR Lvl Hi3 66%

Permits Manual energization of SR Hi Volts supply

P11

PZR NR Pressure <1970PSIG

Permits Manual Block of SG NR Hi3 76% Rx trip

Permits Manual block of: (ESF Functions)

• Manual block of Safeguards Caused By

  • PZR Pressure Lo3 1855psig

  • Steamline pressure Lo2 560.3

  • Tcold Lo2 505F

• MFW Iso (Tavg Lo1 550F & Tavg Lo2 525F)

• SFW Iso (Tcold Lo2 505F)

• RNS Iso (CTMT Hi2 Rads 100R/Hr & ESF LATCHED)

• SG PORV Iso (Steamline Press Lo2 560.3psig)

• Steamline Iso (Steamline Press Lo2 560.3)

• Steamline Iso (Tcold Lo2 505F)

Unblocks Steamline Iso caused by “Steamline negative pressure rate Hi” when Manual Steamline Iso blocks are in

Permits RNS Iso caused by ADS4

Permits RNS Iso RESET caused by “T” signal

Not P11

NR PZR Pressure ≥1970

Auto Unblocks SG NR Lvl Hi3 76% Rx trip

Auto Unblocks

• Manual block of Safeguards Caused By

  • PZR Pressure Lo3 1855psig

  • Steamline pressure Lo2 560.3psig

  • Tcold Lo2 505F

• MFW Iso (Tavg Lo1 550F & Tavg Lo2 525F)

• SFW Iso (Tcold Lo2 505F)

• RNS Iso (CTMT Hi2 Rads 100R/Hr & ESF LATCHED)

• SG PORV Iso (Steamline Press Lo2 560.3psig)

• Steamline Iso (Steamline Press Lo2 560.3psig)

• Steamline Iso (Tcold Lo2 505F)

Auto Blocks Steamline Iso Negative pressure rate Hi (100PSIG/50sec)

Auto Blocks RNS Iso on ADS4

Sends confirmatory open signal to Accumulator Discharge valves

P12

PZR Lvl <16%

Permits Manual Block of:

• CMT (PZR NR lvl Lo2 10%)

• Aux Spray Iso & Purification Iso (PZR lvl Lo 20%)

Coincident W/ Block of CMT, Aux Spray Iso, and Purification Iso then P12 Unblocks:

• IRWST Injection (HL lvl Lo4 9.7%)

• ADS4 (HL lvl Lo4 9.7%)

Auto Unblocks CVS letdown Iso (HL lvl Lo2 58.1%)

Not P12

PZR Lvl ≥16%

Auto Unblocks P12 PZR Press Lo blocks

• CMT (PZR NR lvl Lo2 10%)

• Aux Spray Iso & Purification Iso (PZR lvl Lo 20%)

Auto Blocks

• IRWST Injection HL lvl Lo4 (9.7%)

• ADS4 HL lvl Lo4 (9.7%)

Permits Manual Block of CVS L/D iso HL lvl Lo2 (58.1%)

P17

Power Range Rate ≤ -15%Rx-Pwr with 5 second TC

Prevents Rod motion that challenges core safety limits

Auto Blocks

• M bank Manual or Auto withdrawal

• AO bank Manual or Auto withdrawal

• AO bank Auto Insertion

Not P17

Power Range Signal > -15% Rx-Pwr

Permits Manual Reset of P17 Auto Blocks

P19

RCS WR <700PSIG

Permits Manual Block of:

• CVS Iso (PZR lvl Hi2 55%)

• PRHR (PZR lvl Hi3 66%)

• PZR HTR trip (PZR lvl Hi3 66%)

Allows PZR lvl Hi blocks for entry into Solid plant OPS

Not P19

RCS WR Press ≥700PSIG

Auto Unblocks P19 permitted manual Blocks

Turbine Overspeed

1980RPM (110% on 2/3)

Turbine Trip Via ABB controller

Turbine backup overspeed

1998 RPM (111% on 2/3 )

Turbine Trip Via PLS

Condensor overpressure

9inches HgA when >375MWe (~30%)

7.5inches HgA when <375 MWe (~30%)

coincidence 2/3 on 1/3 shells

Turbine trip

Main lube oil pump discharge pressure low

106PSIg (2/3)

turbine trip

Main lube oil pump discharge pressure </= 175PSIG

Turning gear oil pump start (EK-31)

Main lube oil pump discharge pressure Less than </= 165PSIG AND TGOP </=10PSIG

Emergency bearing oil pump start (EDS5)

Main lube oil pump discharge pressure </=110 PSIG

Jacking oil pumps start (EC-311/411)

Main lube oil pump suction pressure </=10PSIG

Motor suction oil pump starts (EK-41)

Bearing lube oil supply pressure Low

10PSIG (2/3)

Turbine Trip

Bearing lube oil supply pressure </=16PSIG

TGOP (EK-31) and EOP (EDS5) start

EHC Discharge pressure low

1100PSIG (2/3)

Turbine Trip

EHC Discharge Pressure </=1300PSIG

Start Standy EHC pump (EK31/41)

TCS stator winding inlet pressure low

17.4PSIG (2/3) for 70 seconds

Turbine Trip

MSR Shell lvl Hi-2

9.85” from shell bottom (2/3)

Turbine trip

Turbine Thrust bearing wear Hi-2 Lo-2

±0.030inches (2/3)

+ is wear towards Generator

- is wear towards turbine

Turbine trip

LP turbine exhaust hood temp Hi-2

225F (2/3 on 1/3 shells)

Turbine Trip

TCS Skid inlet temp Hi-2

194F for 55 seconds (2/3)

Turbine Trip

MG Stator outlet temp Hi

194F for 55 seconds (2/3)

Turbine Trip

SWF pump Auto Start

Loss of all MFW pump scenario

Turbine trip

OA Watchdog

OA drop failure will cause ETS to send Turbine trip signal

Turbine Speed Sensor failure

2 channels of speed control BAD quality AND MG breaker open Turbine Trip

ETS Heavy Trip

If ETS drop fails a timeout will occur and the Toshiba Trip device will actuate Turbine Trip

Generator system Trip

86 Lockout of MG will cause Turbine Trip

P4

P4 will cause Turbine Trip

Manual FWS ISO

Case A, B, and C will cause Turbine Trip

SG NR Lvl Hi3

76% (2/4 on 1/2SGs)

Turbine Trip

Source Range Flux High

1-E5 Counts Per Second (2/4)

RX Trip

Manual Block ≥P6

Auto Block ≥ P10

Auto Unblock <P6 (20 Sec TD)

Reset Enabled <P10

Intermediate Range Flux High

25% IR (2/4)

RX Trip

Man Block ≥ P10

Auto Unblock < P10

Power Range Flux High (LOW)

25% Calibrated PR

RX Trip

Power Range Flux High (HIGH)

118% (2/4) Calibrated PR

RX Trip

Power Range Positive Flux Rate High

12% per Min (2/4)

RX Trip

RCP Bearing water temp Hi-2

185F (2/4 on ¼ RCP)

Shuts CCS CIVs (200,207,208)

RX Trip

RCP Trip

Over-Temp ∆T (OT∆T)

q∆T≥OT∆T Setpoint (2/4)

(Typically Floating Setpoint @ 119%)

RX Trip

Over Power ∆T (OP∆T)

q∆T≥OP∆T Setpoint (2/4)

(Typically Floating Setpoint @ 108.5%)

RX Trip

Pressurizer Pressure Hi-2

2405 psig (2/4)

RX Trip

Pressurizer Pressure Lo-2

1955 psig (2/4)

RX Trip

Auto Block <P10

Pressurizer Water Level Hi-3

66% (2/4)

RX Trip (Auto Block <P10)

PZR HTR Trip (Man Block < P19, Auto Unblock ≥19)

PRHR Actuation (Man Block <P19, Auto Unblock ≥P19)

RX Coolant Flow Rate Lo-2

90% (2/4 on ½ Hot Legs)

RX Trip (Auto Block <P10)

RCP Speed Lo-2

91% (1/1 on 2/4 RCPs)

RX Trip (Auto Block <P10)

Steam Gen NR Water Level Lo-2

21% (2/4 on ½ SGs)

RX trip (Man Block <P9, Auto Unblock ≥ P9)

SG Blowdown Iso (Train specific Man Block <P9, Auto Unblock ≥ P9)

Steam Gen NR Water Level Hi-3

76% (2/4 on ½ SGs)

RX Trip (Man Block <P11, Auto Unblock ≥P11)

Turbine Trip (Man Block <P9, Auto Unblock ≥P9)

FWS Iso Parts A,B,C (Man Block <P9, Auto Unblock ≥P9)

CVS Makeup ISO (Man Block <P9, Auto Unblock ≥P9)

PZR Level Lo DAS

7.5% (2/2)

RX Trip

RCP Trip

CMT Actuation

Turbine Trip

Hot Leg Temp- Hi DAS

643F (2/2) DAS

Rx Trip

PRHR Actuation

Turbine Trip

ATWS Protection

CTMT Press Hi-2

5 PSIG (2/4)

Safeguards

Steamline Iso

PCS Actuation

PZR Press Lo-3

1855 PSIG (2/4)

Safeguards (Man Block <P11, Auto Unblock ≥P11)

Steamline Press Lo-2

560.3PSIG (2/4 on ½ Steamlines)

Safeguards (Man Block <P11, Auto Unblock ≥P11)

Steamline Iso

PORV Iso

RCS Tcold Lo-2

505F (2/4 on ½ loops) RSA or Dedicated Tcold

Safeguards (Man Block <P11, Auto Unblock ≥P11)

Steamline Iso

FWS Case C (Man Block <P11, Auto Unblock ≥P11)

Safeguards actions?

Unlatched: RX Trip / CTMT Iso / FWS Iso A&B / Close CCS CIV / CVS makeup Iso Setpoint changes to PZR NR Lvl Hi (23%)

Latched: RNS to CTMT Iso / CMT Actuation / Enable Critical Safety Function Alert

PZR lvl Lo-2

10% (2/4)

CMT Actuation (Man Block <P12, Auto Unblock ≥ P12)

RCP Trip

SG WR Lvl Lo-2 W/ HL NR Temp Hi

35% (2/4 on Both SGs) & 636F (2/4)

CMT Actuation (Man Block <P9, Auto Unblock ≥P9)

SG WR Lvl Low (DAS)

26% (1/2 on 2/2 SGs)

ATWS Protection

Rx Trip

CMT Actuation

RCP Trip

PRHR Actuation

SG NR Lvl Lo2 W/ SFW Flow Lo2

21% (2/4 on ½ SG) for 165sec TD AND ≤200gpm (1/2 SFW Line)

PRHR Actuation (Man Block <P9, Auto Unblock ≥P9)

SG WR Lvl Lo2

35% (2/4 on ½ SGs)

PRHR Actuation (Man Block <P9, Auto Unblock ≥P9)

CTMT temp Hi DAS

176.5F (2/2)

CTMT Iso

PCS Actuation Only opens PCS- 1A/B/C

Tavg Lo W/ P4

550F (2/4) W/ P4 (P4 is Rx trip signal)

FWS Case A Iso (Man Block <P11, Auto Unblock ≥P11)

Tavg Lo2 W/P4

525F (2/4) W/P4 (P4 is Rx Trip Signal)

FWS Case B Iso (Man Block <P11, Auto Unblock ≥P11)

SG NR Lvl Hi W/ P4

66.8% (2/4 on ½ SGs) W/ P4 (P4 is Rx Trip signal)

FWS Iso Case C (Man Block <P9, Auto Unblock ≥P9)

CVS M/U Iso

CTMT Hi2 Radiation

100 R/Hr (2/4)

RNS Isolation (Man Block <P11, Auto Unblock ≥P11)

CVS Makeup Isolation

IDS 24Hr battery charger low input voltage

345VAC (2/2 on 2/4 divisions)

Must Be Div A or C AND B or D for BDP & MCR/VES

Boron Dilution Protection 15 Second Delay

MCR Iso and VES 10 Minute Delay

Close CVS-V136A/B

Align CVS-V115 to BAST

ADS 1-3 at 22Hr time delay

CTMT Recirc at 23 Hr time delay (Only PXS-V120A/B Open)

PZR Lvl Hi W/ Safeguards signal

23% (2/4) And ESF

CVS Makeup isolation

PZR Lvl Hi2

55% (2/4)

CVS Makeup Isolation (Man Block <P9, Auto Unblock ≥P9)

Source Range Flux Doubling

SR Flux X 2.2 in 10 seconds

CVS Makeup Iso

Close CVS-V136A/B

Trip CVS M/U Pumps

Align CVS-V115 to BAST

Boron Dilution Protection

IF CVS M/U Iso and BDP Manually Blocked CVS-V136A/B WILL Close

Hot Leg Lvl Lo2

58.1% (1/2)

CVS Letdown Iso

PZR Lvl Lo

20% (2/4)

Aux Spray and Purification Iso

Steamline Pressure Negative Rate Hi

100 PSIG W/ 50 second time constant (2/4 on ½ steamlines)

Steamline Iso