Operator Memory Items Flashcards
PYBP-POS-0027
List the following characteristics for SRVs
Safety Setpoints
Relief Setpoints
LLS Valve Setpoints
How many SRVs per setpoint mode?
How much pressure for SRV blowdown?
Safety SP Qty Relief SP QTY 1165# 8 1103# 1 1180# 6 1113# 9 1190# 5 1123# 9
LLS Lift LLS Close LLS Valve 1033# 926# B21-F501D 1073# 936# B21-F501C 1113# 946# Other 4 Valves
Approx 100#
List the trips, setpoints, and basis of automatic MSIV closure signals.
MSL Press Low - 807# - Implicates a likely failure of the PR system.
Low Condenser Vacuum - 21.5” HgA - Indicates loss of heat sink.
Low Rx Lvl L1 - 16.5” - Limits potential release during LOCA.
High MS Line Flow - 254psid - Indicates potential rupture downstream of flow detectors.
High TB Temp - 145.8F - Indicates potential rupture in TB.
High Steam Tunnel Temp - 156F or 152.5F - Indicates potential rupture in HB
Manual - Control Switch
What is the Level 8 Setpoint?
List all trips that occur at this setpoint, and the basis of them.
L8 - 219”
Rx Scram (In Run)
Insert -𝛿k into core, stop +𝛿k addition.
MT Trip
Prevent carryover damage to main turbine.
RFPT/MFP Trips
Prevent carryover damage to turbines.
E22 Inj Valve Close
Avoid overfeeding vessel to prevent flooding RCIC turbine steam line.
E51 Stm Adm Vlv Close
Avoid overfeeding vessel to prevent flooding RCIC turbine steam line.
What are the setpoints for L4-L7?
List the bases of these setpoints and any automatic trips that occur.
L7 - 205”
Hi Lvl Alarm
Alert operator to abnormality in level.
L5 - 201” ± 4”
Normal Operating Band
PLSP is 192”-200”. No carryover/under, sufficient NPSH for Recric Pumps.
L4 - 197”
Low Level Alarm
Alerts operator to problem.
B33 Runback to 17%, 48mlbm/hr
Reduce power allowing RFPT to handle load, RCP must be in fast speed.
What is the L3 setpoint?
What trips occur at this setpoint, and what are the bases behind them?
L3 - 178”
Rx Scram
Avoid carryunder.
B33 Downshift
Insufficient NPSH for fast speed.
RHR SDC Isolation
Isolates potential source of leakage.
ADS Confirmatory
To prevent ADS initiation potential with just L1 signal, L3 confirmatory signal is required on Timed logic.
Setpoint SD activated
Prevents overfeeding vessel on recovery.
What is the L2 setpoint?
What trips occur at this setpoint and what are the bases behind them?
L2 - 130”
HPCS & RCIC Start
Recover inventory prior to Level 1.
Div 3 DG Start
Preparation to load bus.
NS4 BOP Isolation
Anticipate possible LOCA.
B33 Pump Trip
Insert -𝛿k for ATWS.
G33 Isolation
Isolate possible source of leakage.
What is the L1 Setpoint?
What trips occur at this setpoint and what are the bases behind them?
L1 - 16.5”
LPCS Start
Inject to keep core covered.
LPCI (RHR) Start
Inject to keep core covered.
Div 1 & 2 DG Start
Prepare to load bus.
ADS Initiation (105 Sec TD)
Allow for Low Pressure ECCS to inject.
AEGTs (M15) Auto-Start
Prepare to process contaminated atmosphere.
MSIV Auto Closure
Limit Rad Release in LOCA situation.
RHR Isolations
Limit Rad Release in LOCA situation.
List the RCIC isolation setpoints and their bases.
Which system provides the inputs for the RCIC isolation?
Hi RCIC Room Temp - 143F
Potential break in RCIC, could exceed offsite dose limits.
Hi Steam Tunnel Temp - 156F
Potential break in RCPB, could exceed offsite dose limits.
29 Min Time Delay
Hi RHR Room Temp 157F
Potential break in RCIC, could exceed offsite dose limits.
Hi Steam Flow - ?
Potential RCIC steam line break. RPV depressurization and core uncovering could occur. Minimize core damage.
Steam Supply Pressure Low - 60# RPV
Steam pressure too low for RCIC to work, protect RCIC.
Hi Exhaust Diaphragm Pressure - 10#
Steam backpressure too high for proper RCIC operation, protect RCIC.
Trip input provided by E31, Leak Detection
List the RHR SDC isolation setpoints and their bases.
Which system provides the isolation signals?
RHR Room Temp - 157F
Potential break in RHR piping, minimize offsite dose.
RPV Pressure Hi - 135#
Saturation pressure for RHR Pump Seal design temp, 360F. Protects RHR pump seals.
Level 3 - 178”
Isolate potential source of a leak.
Trip inputs provided by NS4
What are the T.S. Safety Limits?
What are the actions for violating them?
2.1.1 Reactor Core SLs
2.1.1.1
With the reactor steam dome pressure < 686 psig or core flow < 10% rated core flow;
THERMAL POWER shall be ≤ 23.8% RTP.
2.1.1.2
With the reactor steam dome pressure ≥ 686 psig and core flow ≥ 10% rated core flow;
The MCPR shall be ≥ 1.07.
2.1.1.3
Reactor vessel water level shall be greater than the top of active irradiated fuel.
Reactor Coolant System Pressure SL
Rx steam dome pressure shall be ≤ 1325 psig.
Complete the following actions within 2 hours;
-Restore compliance with all SLs.
-Insert all insertable control rods.
Regarding RRCS initiation logic
What conditions will cause RRCS to initiate?
What different types of initiations for RRCS are there?
ARI
L2 (130”) or 1083 psig ARI is initiated.
FWRB
1083# RPV Pressure with APRMs not downscale (<4%) after 25 seconds, FWRB is initiated.
ATWS RPT - Downshift
1083# RPV pressure Recirc pumps downshift to slow speed.
ATWS RPT - Trip
1083# RPV Pressure with APRMs not downscale (<4%) after 25 seconds, ATWS RPT initiated.
List the SRM Inop and Rod Block conditions
Inop Conditions
-Switch not in operate
-Hi volts
-Low volts
-Card not in file
Rod Blocks
- SRM Inop
- Downscale @ 0.7 cps (bypass IRM R3)
- <100 cps & not full in (bypass IRM R3)
- Upscale @ 1x105 cps (bypass IRM R8)
List the IRM Inop, Rod Block, and Scram conditions
Inop conditions
-Switch not in operate
-Hi volts
-Low volts
-Card not in file
Rod Blocks
- Inop
- Downscale @ 5/125 (IRM R1 Bypass)
- Upscale @ 80/125
- Detector not full in
Scrams
- Inop (1 out of 2 twice)
- Hi Hi @ 120/125 (1 out of 2 twice)
IRMs are bypassed when MS is in Run.
List the Inop, Rod Block, and Scram conditions for APRMs
Inop conditions
-Switch not in operate
-Hi volts
-Low volts
-Card not in file
- < 14 LPRM inputs
Rod Blocks
- Downscale <4% MS in Run
- Recirc flow @ 111%
MS not in run
- Flow Bias Upscale
> .628wr + 55% Capped at 108%
- Neutron Upscale Fixed >12%
MS Not in run
Scrams
- Inop
- Fixed Neutron Flux Hi 118% in run
- High setdown @ 15% not in run
- Flow Thermal Power Hi (30 Sec TDL)
.628wr + 61% capped at 111%
List the RPS Scram Signal Setpoints, When Bypassed & Bases
(Omit Neutron Monitoring, covered in next card)
TSV Closure - 3 TSVs < 95% Open
Bypassed < 38% RTP
Ensure MCPR SL is not exceeded. Primary scram for turbine trip.
TCV Fast Closure - < 530# ETS
Bypassed < 38% RTP
Ensure MCPR SL is not exceeded. Primary scram for generator load reject.
SDV HIGH - > 67% SDV volume
Bypassed M/S in Refuel or S/D w/ key in bypass
Insufficient volume to accept displaced water, control rod insertion hindered.
MSIV Closure - 3 MSIVs < 92% open
MS Not in Run
Reduces energy required to be absorbed and, along with the actions of ECCS, ensures fuel PCT ≤ 2200F
Drywell Pressure High - 1.68psig
Never Bypassed
Minimize possibility of fuel damage and reduce amount of energy being added to the coolant and drywell.
Rx Pressure High - 1065#
Never bypassed
Initiates scram for transients that result in a pressure increase, counteracting positive 𝛿k addition from pressure transient.
Rx Lvl Low - 178”
MS in S/D w/ L3 keylocks in bypass
Recirc line break analysis, along with ECCS, ensure fuel PCT ≤ 2200F.
Rx Lvl Hi - 219”
Bypassed not in Run
Ensures MCPR SL not exceeded. High water level decreases void formation, increasing power, and closes margin to thermal limit.
Manual
Never bypassed on A/D switches
Mode Sw Manual Bypassed with Keylocks
Not credited, but required by NRC for license approval
List the Neutron Monitoring Scram Setpoints, Bypasses, and Bases.
APRM Flux Setdown - 15%
Bypass in Run
Backup to IRM Hi-Hi trip when not in Run
APRM Flux Hi - 118%
Bypass not in run
Terminate MSIV closure event, and, in conjuction with SRVs, limit pressure to < ASME requirements.
APRM Flow Thermal Power - .628wr+.61
Capped at 111%, 30 Second TD
Protect against slow thermal power transients, by ensuring MCPR SL is not violated. High power condition < APRM Hi Setpoint could exist that would violate thermal limits if given enough time.
APRM Inop
Bypass with joystick
OPRM Per, Amp, Growth - No SP
Bypassed when OPRMs not enabled
Ensures MCPR SL is not exceeded.
IRM HI HI - 120/125
Bypassed in Run
Mitigate neutron flux excursions due to control rod withdrawal errors keeping energy depositions below the 170 cal/gm fuel failure threshold.
IRM INOP
Bypassed in Run
List the Main Turbine Trips, Setpoints, and Bases of the Set Points
Thrust Bearing Wear - >48 mils (8# oil)
Indicates thrust bearing failure.
Gen Lockout Relay - 86G
Prevent turbine overspeed on sudden loss of load.
RCIC Initiation - See Italicized Stuff
If power > 95% and back panel switch is in auto, Main Turbine (and RFPTs) will trip after 4.5 TD of RCICI initiation.
If < 95% power or back panel switch is in disable, they will trip instantly.
Prevent carryover that would damage turbines.
Mechanical OSpeed - 110% (1980 rpm)
Prevent turbine blade failure.
Backup OSpeed - 110.5% (105% in STBY)
Backup to mechanical OS trip. In stby, CIVs are not operational.
High RPV Level - 219”
Protect turbine from carryover.
High Vibes - 12 mils
Prevent loosened part damage.
MSR Lvl Hi-Hi - See Italicized
1A/1B - 195”
2A/2B - 217.5”
Prevent Moisture Carryover to LP Turbines
Loss of SWC, Runback Failure - See Below
81C or 42.5 psig on Stator Outlet
Prevent overheating of generator stator windings.
Loss of 125vdc - Turbine < 75% rated
Loss of Control Power source
Loss of 24vdc
Loss of Trip Power
Loss of both speed signals - Active > 100 RPM
Loss of EHC Reference > 100 RPM
Low Condenser Vacuum - 8.1 HgA
Prevent damage due to overheating and water hammer.
Low Brg Oil Hdr Press - 12 psig
Prevent bearing damage.
Loss of EHC fluid - 1100 psig
Prevent loss of turbine control.
Low ETS pressure - 400 psig
Low MSOP D/C Press (>75% RTS) - 100 psig
Indicates MSOP failure.
List all set points associated with the Main and Aux condensers
Load Limit Setback/FCV Runback
5.6” HgA
Main Turbine Trip
8.1” HgA
RFPT Trip
11.5” HgA
Bypass Valve Closure
20” HgA
MSIV Closure
21.5” HgA
Min Flow Valve Logic for all ECCS Systems + RCIC
HPCS
Open - > 145psig && < 725 gpm
Close - < 145 psig || > 725 gpm
LPCS
Open - Bkr Closed && < 1350 gpm
Close - > 1380 gpm for 5 seconds
RCIC
Open - > 125 psig && < 120 gpm
Close - > 180 gpm || E51F045 closed || E51F510 closed
RHR Pumps
Open - Bkr Closed && < 1650 gpm for 8 seconds
Closed - > 1650 gpm
Which ECCS pumps have trips not due to electrical failure?
Not an O/C, U/V, fault, etc
RHR A & B have pump trips due to no suction path.
Explain LOOP Logic
If, in applicable Division, any of the following:
- < 3000 VAC for 3 seconds
- < 3800 VAC for 12 sec w/ LOCA
- <3800 VAC for 4 minutes
And, either of the following in the opposite division:
- EH Undervoltage (<3000 VAC for 3 seconds)
- EH Underfrequency <59 hz
LOOP Logic initiates for applicable division.
List Trips to start CR HVAC & Emergency Recirc
CR Atmosphere Radiation Hi (GAS)
LOOP
Rx Lvl Lo L1
DW Press Hi 1.68#
