Catch All

SRM Upscale (> 2 x 10^5 cps)

• Bypass
• Shorting links installed OR
• Joystick

• SETPOINT
• SRM INOP
• __Module Unplugged
• __Switch out of operate
• __High Volts Lost (Low)*
• SRM Upscale Alarm (> 1 x 10^5 cps)

• BYPASS
• __Joystick OR
• __MSS in RUN OR
• __IRM’s Range 8 or above

• SETPOINT
• SRM Downscale (< 3 cps)
• Detector not fully inserted AND (< 100 cps)

• Bypass
• Joystick OR
• MSS in RUN OR
• IRM’s Range 3 or above
• *Loss of 24VDC does not affect drive power

Short Period (< 50 sec)

Setpoint

• IRM Upscale
• __(120/125 Scale) (38.4/40)
• INOP
• __Module Unplugged
• __Switch out of operate
• __High Volts Lost (Low)*

*IRMs are powered from 24 VDC. They will fail downscale and INOP on a loss of the 24 VDC signal.

Bypass

• Joystick OR
• MSS in RUN

• IRM Upscale (108/125 Scale) (34.5/40)
• INOP (also half scram)
• __Module Unplugged
• __Switch out of operate
• __High Volts Lost(Low)*
• IRM Downscale (B/P in Range 1) (5/125 Scale) (1.6/40)
• Detector Not Full in

• Bypass
• Joystick OR
• MSS in RUN

*IRMs are powered from 24 VDC. They will fail downscale and INOP on a loss of the 24 VDC signal.

• P - APRM STP Upscale
• S - <= 0.56W + 53.1%
• ___<= 0.56(W-10.8%) + 53.1% for SLO
• ___<= 108% maximum with high flow clamped
• B - MSS NOT in RUN

• P - APRM Upscale
• S - <= 11% of RTP
• B - MSS in RUN

• P - APRM Downscale
• S - >= 4% of RTP
• B - MSS NOT in RUN

• P - APRM Inoperative
• S - Mode Switch NOT in Operate
• ___The firmware/Software WDT has timed out
• ___A critical Self-Test fault is detected
• B - None

• P - APRM STP Upscale
• S - <= 0.56W + 58%
• ___<= 0.56(W-10.8%) + 58% for SLO
• ___maximum of 113.5% of RTP
• B - None
• .
• P - APRM Upscale
• S - <= 116.3% of RTP
• ___B - None
• S - <= 17% of RTP
• ___B - MSS in RUN
• .
• P - APRM Inoperative
• S - Mode Switch NOT in Operate
• ___The firmware/Software WDT has timed out
• ___A critical Self-Test fault is detected
• B - None

• P - Detection of Thermal Hydraulic Instability
• S - Rx Power < 24% OR
• ___Total Recirc Flow > 70%
• ___(Core Flow > 76%) OR
• ___APRM in Bypass

OPRM’s are required to be OPERABLE when reactor power is >=19% (TS Table 3.3.1-1). The OPRM will enable when reactor power is > 24%, as sensed by APRM power AND recirculation drive flow < 70% (nominal).

4 BOP Pump Trips

• Level 4 (+30”) w/ RFP trip signal
• CWP Trip (4 initially, Cond Vac > 4.5” HgA)
• PCP Trip w/ Feed > 73.65% and >= 2 RFP Running
• SCP Trip w/ Feed > 73.65% and >= 2 RFP Running

SCORE

• Loss of SWC (12 Sec TD)*
• CWP Trip (<=2 running, Cond Vac > 5.8” HgA)
• Discharge valve not full Open
• RPV Level 3 (+12.5”)
• FEEEEEd flow <22% (15 Sec TD)
• *Loss of SWC is determined by the DEHC controller. The DEHC controller has a 15 sec TD BEFORE the R/B 12 sec TD starts (27 Sec Tot)

EOC

• TSV Closure (<95% Open) (EOC)*
• TCV Fast Closure (EHC Press <530 PSIG) (EOC) *@

ATWS

• RPV Pressure 1071 PSIG (ATWS)
• RPV Level -38” (9 Sec TD) (ATWS)

• *Bypassed <18% (1st stage pressure <98.1 psig)
• @No power to RPS bus => EOC RPT assumes >98.1 psig

• 0 – (+)60”
• Calibrated hot: 1000 psig
• 135 F Drywell
• 75 F Rx bldg.

• -150 – (+)60”
• Calibrated hot: 1000 psig
• 135 F Drywell
• 75 F Rx bldg

• 0 – (+)180”
• Calibrated hot: 1000 psig
• 135 F Drywell
• 75 F Rx bldg

• 0 – (+)400”
• Calibrated cold: 0 psig
• 120 F water
• 80 F DW
• 75 F Rx bldg

• -311 – (-)111”
• Calibrated for accident: no jet pump flow
• 0 psig in vessel and drywell
• saturated steam water mixture
• 75 F Rx bldg.

When in refueling the absence of the Fuel Pool Low Level Alarm indicates that level is >22’ 5” above the RPV flange.

0-1200 psig OR 0-1500 psig

850-1050 psig

0-50 psig

Channel A and B – They have the shortest vertical run of piping in the drywell. (See EOP Caution 1)

Shift to fast speed on Level 3 (+12.5” OR 1037 psig) – To return to slow speed, you must hit the button next to the recorder, if you are below 12.5” or above 1037# you cannot return to slow

• (4 Turbine Trips)
• Main Turbine Trip (NR)
• RFP Turbines Trip (NR)
• HPCI Turbine Trip (WR)
• RCIC “Trip” (WR)*
• *(F045 X => Secures Steam)

Hi Level Alarm (NR)

Normal Operating Level

• Low Level Alarm
• Intermediate (45%) Recirc Runback
• (IF concurrent w/ an RFP trip)

• Reactor Scram
• FWLC Stpt Set-Down (+14”)(.5 sec TD)*
• RHR S/D Cooling Isolations (NSSSS)
• Full Recirc Runback
• ADS Confirmatory Signal
• RHR Sample and D/ch to RW isolation
• *RPV level 12.5” Reduces RFP control band to 14” to (attempt to) prevent over feeding on a scram/low level.

• RCIC/HPCI Initiate
• RRCS Input
• __ARI
• __RPT (9 Sec TD)
• __Start 3.9 minute SLC timer
• A&B SACS pump start
• RBVS isolates, supply and exh. fan trip
• FRVS fans start
• Radwaste Supply and exh. fans trip
• EIAC trips
• PCIS Isolations:
• __RC Boundary Leak Det. Syst.
• __H2/O2 Analyzers
• __CPCS/N2ME/DW Purge Valves
• __H2 Recombiner
• __TWCU
• __PCIG (minor)
• __Drywell Floor and Equipment Drains
• NSSSS Isolations
• __RWCU F001/F004
• __Recirc Sample 4310/4311
• __TIPS Retract and Isolate

• CS/LPCI Initiate
• Signal to ADS Logic
• A-D Diesels, SACS, and SSW Start
• CRD Trips
• PCIG Trips
• FPC, PCIG, TACS SACS cross ties close
• RACS pumps A&B Trip, SSW to RACS Isol.
• RACS to Turb and Aux bldgs isolates
• TSC Chillers Start
• CREF aligns and both loops start
• Non 1E MCCs Trips
• __DW Coolers Trip
• __MT LO Pumps and Lift Pumps Trip
• __RFP LO Pumps Trip
• NSSSS Isolations
• __MSIVs and MSIV Drains (F016 & F019)
• PCIS Isolations
• __Chilled Water to DW
• __RACS to Recirc Pump Pedestal
• __CRD to Recirc Seal Purge

Rx Flange

Steam Lines

Top of Moisture Separator

TAF

Level Zero

This is equivalent to the top of the jet pump throat threat sections 2/3 core height

It is the minimum reactor vessel level following recovery from a double ended shear of a recirc suction line

BAF

The pressure drop across the steam dryers can cause a 7” level difference (inside core shroud-downcomer).

1130

1120

1108

1071

1047

1037

1022.4

1017

935

905

756

461

450

100

82

64.5

>1071psig

• ARI
• __Immediate
• RPT Trip
• __Immediate
• Feedwater Runback to 2500 RPM (650 RPM IF Speed Control Failure)
• __After 25 second TD IF APRMs not Downscale or INOP
• SLC initiation and RWCU isolation
• __After 3.9 minute TD IF APRMs not Downscale or INOP

Low Level <-38”

• ARI
• __Immediate
• RPT Trip
• __After 9 sec TD (Seals in)
• SLC initiation and RWCU isolation
• __After 3.9 minute TD IF RPV level < -38” AND IF APRMs not Downscale or INOP

• ARI
• __Immediate
• SLC initiation and RWCU isolation
• __After 3.9 minute TD IF APRMs not Downscale or INOP

• 0 s_____ARI Valves Open
• ________Both Recirc Pump RPT Breakers Trip
• ________RFP, ARI, SLC Timers Start
• 25 s____RFPs Runback (2500 RPM)
• 30 s____“ARI Ready for Reset” IF High Press Clear
• 55 s____RFP control returned to operator in MAN
• 3.9 m __SLC Initiates IF APRMs INOP or not DNSCL
• ________Starts 10 min reset timer
• 13.9 m_“RRCS Ready for Reset” light

• 0 s_____ARI Valves Open
• ________RPT, ARI, SLC Timers Start
• 9 s_____Both Recirc Pump RPT Breakers Trip
• 30 s____“ARI Ready for Reset” IF High Press Clear
• 3.9 m __SLC Initiates IF APRMs INOP or not DNSCL
• ________Starts 10 min reset timer
• 13.9 m_“RRCS Ready for Reset” light

• S - >= 12.5" (Level 3)
• B – None

• S - <=1037 psig
• B - None

• S - <=1.68 psig
• B - None

• S - N/A
• B – None

• S - <= 17% of Rated Thermal Power
• B - MSS in RUN, Joystick in Bypass

• S - <= 116.3% of Rated ThermalPower
• B - Joystick in Bypass

• S - <= 0.56W + 58 %
• ___<= 0.56(W-10.8%) + 58% for SLO
• ___<= 113.5% of Rated Thermal Power (High Flow Clamped)
• B – No bypass

• S - Mode Switch NOT in OPERATE
• ___Firmware/Software WDT has timed out
• ___Critical Seft-Test Fault is detected
• B - Joystick in Bypass

• S - <= 120/125 full-scale
• B - MSS in RUN, Joystick in Bypass

• S - Module unplugged
• __Function switch NOT in OPERATE
• __High Voltage power supply low.

• B - MSS in RUN
• __Joystick in Bypass

• S - <= 2.0 X 10^5 CPS
• B - When Shorting Links are Installed, Joystick in Bypass

• S - N/A
• B - 10 Seconds after MSS in SHUTDOWN

• S - 80.5" above Instrument zero (South Header)
• 83.25" above Instrument zero (North Header)
• B - MSS in SHUTDOWN OR
• MSS in REFUEL AND
• Keylock Switch in BYPASS

• S - <= 8% closed
• B - MSS NOT in RUN

• MSIV Position requires 3 of 4 MSL’s to be closed for a full SCRAM
• 1/2 SCRAM on any combination that is NOT A&D or B&C.

• S - <= 5% closed
• B - Turbine First Stage Pressure <=98.1#

• Turbine Stop Valve Position requires 3 of 4 TSV’s to be closed for full SCRAM.
• 1/2 SCRAM on any combination that is NOT 1&4 or 2&3.

• S - >= 530 psig EHC Trip Oil Pressure
• B - Turbine First Stage Pressure <=98.1 #

• TCV Fast Closure is sensed by TCV ETS pressure low. Logic for full SCRAM is “1 out of 2, taken twice” logic.
• 1/2 SCRAMs on combinations 1&4 or 2&3.

• S - Detection of Thermal Hydraulic Instability
• B - Reactor Power < 24% OR
• __Total Recirc Flow > 70%
• __Core Flow > 76% (nominal) OR
• __APRM in Bypass