ONIs Flashcards
ONIs and Entry Conditions
ONI-B21-1
Entry Conditions,
Automatic Actions,
&
Immediate Actions
SRV Inadvertant Opening/Stuck Open
Entry Conditions:
Alarms:
SRV OPEN (19A A-7)
SRV LEAKAGE P614 (7A B-8)
Parameters:
Loud rumbling noise in vicinity of tailpipe discharge
SUPP POOL TEMP increase
SUPP POOL LVL increase
MAIN GEN MW decrese
MS to FW FLOW mismatch
SOL A(B) STATUS red indiciating light
ADS SRV pressure monitoring red indicating light
SRV pressure monitoring red indicating light
Immediate Actions:
1. Prior to reaching SP Temp or RPV Press limits, SCRAM the reactor.
2. If three or more SRVs open in Mode 1 or 2, SCRAM the reactor.
3. Evacuate Containment
4. Reduce power with Recirc flow to ≤ 96%.
5. When power is ≤ 96%, perform the following:
- Verify Rx Pressure < 1033 psig
- Attempt to close the SRV- place both switches in off.
No automatic actions associated
ONI-C11-1
Entry Conditions,
Automatic Actions,
&
Immediate Actions
Inability to Move Control Rods
Alarms:
Electrical Malfunctions:
ROD WITHDRAWAL BLOCK
INHIBIT ROD MOTION RCIS OOS
BUS XH11(12) STRIPPED UNDERVOLTAGE
Hydraulic Malfunctions:
CRD HCU LEVEL HI/PRESS Lo
CRD PUMP A(B) TRIP OIL PRESS LOW
CRD PUMP A(B) TRIP SUCT PRESS LOW
CRD PUMP A(B) SUCTION FILTER DIFF PRESS HI
CRD PUMP A(B) DISCH FILTER DIFF PRESS HI
CRD PUMP AUTO TRIP
Parameters:
If due to CRD pump malfunction:
CRD DIFF PRESS DRIVE < 250 PSI
CRD PUMP AMPS A(B) 0 AMPS
CRD PRESSURE CHARGING WATER < 1800 PSIG
If due to a CRD FCV malfunction:
CRD DIFF PRESS COOLING < 15 PSID
CRD FLOW COOLING WTR < 54 GPM
CRD FLOW TOTAL SYSTEM < 40 GPM
If Due to an RCIS malfunction:
DATA FAULT pushbutton backlit
INSERT (WITHDRAW) BLOCK indicating light
INSERT (WITHDRAW) INHIBIT indicating light
CHANNEL DISAGREE pushbutton backlit
Other Parameters:
Control Rod not previously identified as slow to settle takes ≥ 30 seconds to settle.
Neutron Monitoring indication does not change when attempting ot move control rods.
No automatic actions associated
ONI-C11-2
Entry Conditions,
Automatic Actions,
&
Immediate Actions
Uncoupled Control Rod
Entry Conditions:
Alarms:
Rod Overtravel
Parameters:
Power level or flux indication does not change as expected as control rod is being withdrawn.
ROD UNCOUPLED indicating light illuminated
Digital display of control rod position on the Rod Display Module goes blank.
Loss of control rod FULL OUT light.
Immediate Actions:
Stop control rod withdrawal.
No automatic actions associated
ONI-C11-3
Entry Conditions,
Automatic Actions,
&
Immediate Actions
Control Rod Drop
Entry Conditions
Alarms:
~~~
ROD BLOCK SRM UPSC/INOP ROD BLOCK IRM UPSCALE
IRM X/Y UPSC TRIP/INOP ROD BLOCK APRM UPSCALE
APRM X/Y UPSC TRIP/INOP LPRM UPSCALE
SRM PERIOD SHORT MSL RADIATION HIGH
MSL RADIATION HI-HI/INOP PRM P604
~~~
Parameters:
Rapid increase in power as indicated by one or more of the following:
SRM Count Rate, IRM Readings, LPRM Readings, APRM readings
MAIN STEAM LINE RAD MON activity level increase
OFF GAS PRETREAT activity level increase
Automatic Actions:
Possible reactor scram due to high neutron flux or high pressure.
Immediate Actions:
If gross fuel element failure is indicated, refer to ONI-J11-1 (Gross Fuel Cladding Failure).
ONI-C34
Entry Conditions,
Automatic Actions,
&
Immediate Actions
Feedwater Flow Malfunction
This one is very large and important
Entry Conditions:
Alarms:
~~~
RFPT A(B) TRIP MFP TRIP
RX LEVEL HI/LO L7/L4 FEED/STEAM FLOW MISMATCH
MFP FCV FREEZE LOW AIR
~~~
Parameters:
Unexpected change in:
~~~
Rx Level Feed Flow
Steam Flow RFPT A(B) FLOW
MST TO RFPT FLOW RHST TO RFPT FLOW
MFP FLOW RFPT CONT VALVE POSIT
RFPT RPM MFP AMPS
~~~
MAIN STEAM to FEEDWATER FLOW mismatch
Loss of all workstations (C34 HMI touch screens)
Automatic Actions:
If RFPT tripped, MFP will automatically start and shift to auto if control switch is in Auto
If feed flow decreases to < 3.43 mlbm/hr for > 15 seconds, Recirc pumps will downshift to slow.
At vessel level 3 (178”):
&esmp;Reactor scram
Recirc pumps downshift
RHR SDC isolates.
At vessel level 8 (219”):
RFPTs & MFP trip,
Main Turbine/Generator Trip
If in Run, Reactor Scrams
The Following cause a shift from 3 Element to 1 Element control:
Loss of a valid steam flow signal
Loss of a valid feed pump suction flow signal
Loss of a valid feed pump recirc flow signal
Immediate Actions:
1. If flow malfunction occured, perform the following:
A. Transfer affected RFPT to manual dial
And, if necessary,
B. Transfer MFP MAN/AUTO STATION to Manual
- If feed pump failure occured, start feed pumps as necessary to match steam flow and feed flow.
ONI-C51
Entry Conditions,
Automatic Actions,
&
Immediate Actions
Unplanned Change in Reactor Power or Reactivity
Entry Conditions
- Operation in MANUAL SCRAM REQUIRED region of the Power to Flow map when OPRMs Inoperable
- Operation in the CONTROLLED ENTRY/IMMEDIATE EXIT region that is NOT in accordance with an approved instruction when the OPRMs are inoperable
- Operation in the IMMEDIATE EXIT region of the Power to Flow map when OPRMs are operable
- FMEOD > 1.000
- Unplanned changes in reactor power
- FCV malfunction
- Recirc Pump trip
- Unintentional Recirc Pump downshift
- Recirc loop jet pump flow mismatch exceeding TS limits
Alarms:
~~~
SRM PERIOD SHORT ROD BLOCK SRM UPSC/INOP
ROD BLOCK SRM DS ROD BLOCK IRM UPSC
IRM X/Y UPSC TRIP/INOP ROD BLOCK IRM DS
LPRM UPSC LPRM DS
ROD BLOCK APRM UPSC APRM X/Y INOP/TRIP
ROD BLOCK APRM DS RCIRC MOTOR LOCKOUT
RCIRC AUTO XFER INC RCIRC MG SET LOCKOUT
MAST/FLUX CON TROUBLE FCV MOTION INHIBITED
FCV HPU INOP RCIRC FCV RUNBACK
OPRM ALARM ROD BLOCK APRM RCIRC FLOW HI
~~~
Parameters:
Reactor power changes
Reactor level changes
MAIN GEN MWATTS changes
FW FLOW & MS FLOW change
Recirc Loop flow mismatched
Automatic Actions:
Possible rod block or reactor scram due to high flux
Possible rod block due to low flux
Possible OPRM scram
Immediate Actions:
- If any of the following conditions exist, SCRAM the reactor:
a. More than one control rod inadvertently scrammed.
b. Unexplained power rise which cannot be quickly terminated.
c. Entry into manual scram region when OPRMs inoperable.
d. No recirc pump flow in Mode 1 or 2.
e. Power oscillations are observed.
- If flow cannot be controlled, arm and depress HPU S/D switch
- If OPRMs are operable, and entry into immediate exit region, insert cram rods IAW FTI-B02 to approx 35% power.
ONI-C61
Entry Conditions,
Automatic Actions,
&
Immediate Actions
Evacuation of Control Room
Entry Conditions
Any unsafe situation such as fire, toxic gas, high airborne activity, or unforeseen emergency which requires evacuation of the Control Room. The Unit Supervisor shall have evaluated the possibility of remaining in the Control Room with breathing apparatus and shall evacuate the Control Room only if necessary.
Alarms:
CONT RM HVAC EMERG RCIRC INITIATED
HIGH alarm on Common Airborne Rad Mon. Panel
ALERT alarm on Common Airborne Rad Mon. Panel
Automatic Actions
Control Room HVAC trains shift to Emergency Recirc
Immediate Actions
1. Scram the reactor
2. Verify Mode Sw locked in S/D
3. Prior to evacuating control room, perform as many of the following as possible:
Verify control rods are inserted
Verify thermal power decreasing
Depress TURBINE TRIP
Place Div 3 DG DIESEL CONTROL XFER SW to Local
Initiate subfloor CO2 if necessary.
Evacuate the Control Room
ONI-C71-1
Entry Conditions,
Automatic Actions,
&
Immediate Actions
Reactor Scram
Entry Conditions
Alarms:
~~~
Full Scram RPS MAMNUAL SCRAM
RPS RX PRESS HI RPS DW PRESS HI
RPS INST VOL LVL HI RPS NEUTRON MON TRIP
RPS MSIV CLOSURE RPS TURB CONT V FAST CLOSURE
RPS RX LVL HI L8 RPS RX LVL LO L3
RPS TSV CLOSURE RRCS DIV 1 P001
RRCS DIV 2 P002
~~~
Parameters:
- Rapid reduction in power
- Reactor Level initially decreases then increases
- MAIN GEN MWATTS decrease
- MS & FW FLOW decrease
- If level reaches 178”, SETPOINT SET DOWN indicating light lit
- Eight white RPS CH SCRAM SOL VALVES indicating lights are off.
- Selected control rod or group inserts to position ‘00’
- Green FULL-IN status lights for all control rods on the full core display
- INSTR VOLUME VENT VLV CLOSED are on.
- INSTR VOLUME DRAIN VLV CLOSED are on.
Automatic Actions
- All withdrawn control rods are fully inserted into the core.
- SDV Vent valves close.
- SDV Drain valves close
- MSIV Closure on low steam pressure of 807# when MODE SW in RUN.
- Setpoint Setdown fires if below 178”
- Recirc pump downshift and FCVs to manual if any downshift signals occur.
- Recric Pump trips from EOC RPT or ATWS RPT
Immediate Actions
Refer to scram hard card, OAI-1703 and verify actions complete
ONI-C71-2
Entry Conditions,
Automatic Actions,
&
Immediate Acions
Loss of One RPS Bus
Entry Conditions
Alarms:
~~~
Potential
RPS TSV CLOSURE RPS TCV FAST CLOSURE
RPS MSIV CLOSURE RPS INST VOL LVL HI
RPS RX PRESS HI RPS RX LVL LO L3
RPS RX LVL HI L8 RPS NEUTRON MON TRIP
RPS DW PRESS HI RPS MANUAL SCRAM
DW PRESS HI/LO BOP ISOL DW PRESS HIGH
Certain
CNTMT VENT EXH RAD X/Y HI-HI/INOP
1/2 SCRAM X/Y
RPS X TRIP UNIT OOF/PWR LOSS
RPS X ISL PWR LOSS CARD OOF
~~~
Parameters:
Half scram on RPS channel.
RPS CH SCRAM ISOL VALVES (White lights) de-energized
MSIV INBD or OTBD position indication de-energized
Associated RPS LOGIC indicating light de-energized.
Automatic Actions:
BOP Isolation on affected division.
RHR SDC isolation regardless of division.
No immediate actions applicable.
ONI-C85
Entry Conditions,
Automatic Actions,
&
Immediate Actions
Pressure Regulator Failure
Entry Conditions
Alarms:
RX PRESS HI
STEAM BYPASS VLV OPEN
CV AMP IN CONTROL
Parameters:
If the pressure regulator failed closed:
~~~
MAIN GEN MWATTS decrease Rx Pressure Increase
Rx Power increase TCVs close
Bypass Valve do not open RGLTR ERROR ind light
MODULE TRIPPED Ind light PR Select Light disagrees
~~~
If the pressure regulator failed open:
~~~
Rapid power reduction Rapid lvl increase - swell
MAIN GEN MWATTS increase TCVs open
Bypass valves open MAX CFL IN CONT lit
RGLTR Error Ind Light MODULE 1,2,3 TRIPPED ind light
PR Select light disagrees
~~~
Automatic Actions
If both regulators fail closed:
Possible scram due to high flux
Possible scram due to high pressure
Possible turbine trip
Possible recirc pump downshift
If both both regulators fail open:
Possible MSIV closure in run
Possible L8 Actuations due to swell
Possible TSF limit on MCFL
Immediate Actions
If both regulators fail, perform the following:
1. Scram
2. Trip turbine
3. If more than 2 bypass valves, fail open, close MSIVs
4. Go to ONI-C71-1
ONI-D17
Entry Conditions,
Automatic Actions,
&
Immediate Actions
High Radiation Levels Within Plant
Enter this ONI when requested by Chemistry or RP, upon receipt of a HIGH alarm on Victoeen area or airborne radiation monitor, or upon receipt of an annunciator in which ARI directly references ONI-D17.
Entry Conditions
Alarms:
~~~
CNT VENT EXH RAD HI CNT VENT EXH RAD X/Y HI-HI/INOP
AREA RAD P803 AIRBORNE RAD P804
COM AREA & PRCS RAD COMMON AIRBORNE P902
PRM P604 CNT EVAC ALARM
DW EVAC ALARM
~~~
Parameters:
High alarm on:
Area Rad Monitor Panel P803
Airborne Rad Monitor Panel P804
Common Process & Area Rad Monitor Panel P906
Common Airborne Rad Monitoring Panel P902
An unexplained increase in area radiation or contaminaton levels as determined by surveys, local moniotors.
Automatic Actions
- > 10^7 CPM on Plant Vent, Off-Gas Vent, or TB/HB Vent will trip rad monitor sample pump
- High alarm on any plant effluent monitor will start PARMS
- Additional automatic actions in attachment 1.
Immediate Actions
Evacuate unnecessary personnel as follows:
Make announcement to evacuate all unnecessary personnel from affected area.
ONI-D51
Entry Conditions,
Automatic Actions,
&
Immediate Actions
Earthquake
Entry Conditions
Alarms
SEISMIC ALARM on P969 with reports of ground movement.
Parameters
TROUBLE Alarm on P969
TRIGGER Alam on P969
OBE Alarm on p969
N240 CAV Amber light lit
Noticable seismic shock by on site personnel
USGS Confirmation
Automatic Actions
Triaxial accelerometers trigger at 0.005g
Immediate Actions
If refueling ops in progress, suspend core alts.
If dry cask ops in progress, suspend dry cask ops.
ONI-E12-1
Entry Conditions,
Automatic Actions,
&
Immediate Actions
Inadvertent Initiation of ECCS/RCIC
Entry Conditions
Alarms
~~~
HPCS PUMP A/S REC. HPCS DW PRESS HIGH
HPCS RX LVL LO L2 LPCS AUTO START RECEIVED
LPCS & LCPI DW PRESS HI LPCS & LPCI RX LVL LO L1
LCPI A AUTO START REC LPCI B & C AUTO START REC
LPCI B&C DW PRESS HI LPCI B&C RX LVL LO L1
RCIC AUTO START REC ADS A PERM LPCS/RHR A RUN
ADS B PERM RHR B/C RUN
~~~
Parameters
- If initiation of cold water results in injection, increase in Rx power will occur.
- Increase in reactor vessel water level
- FEED/STEAM flow mismatch
- Diesel start/running indications
Automatic Actions
Reduction in feed flow to compensate for emergency system injection.
MFP & RFPT trip with RCIC initiation signal (4.5 mind TD if >95%)
Possible Rx scram on high flux or power
Vessel level 8 trips.
Immediate Action
Note: US concurrence required to overide safety system operation. ECCS shall NOT be over-ridden unless one of the following is confirmed:
Initiation proven incorrect
Continued operation no longer necessary
Misoperation in automatic is confirmed.
To override ADS permissives, depress LOGIC SEAL-IN RESET for effected channel.
If required to prevent an ADS initiation, place affected channel ADS LOGIC INHIBIT switch in INHIBIT
ONI-E12-2
Entry Conditions,
Automatic Actions,
&
Immediate Actions
Loss of DHR
Entry Conditions
Alarms
SHTDN COOLING SUCT HDR PRESS HI
RCIC & RHR IOSL RHR RM A/B TEMP HI
ESW PUMP A(B) DISCH PRESS LO
ESW TO RHR A(B) HX’S FLOW LO
RHR PUMP A(B) TRIP
RPS RX LVL LO L3
DW HD FLANGE/REFUEL BELLOWS LR HI
TRSF PL/SEP PL/RX WELL LEAK RATE HI
Parameters
RHR A(B) Pump Flow < 7000 gpm while RHR loop operating in normal SDC mode without a means of natural or forced core circulation.
RHR A(B) Pump flow < 2575 gpm while RHR is operating in the alternate return path SDC mode.
Rx pressure vessel level < 250” with no Recric pump in operation.
Undesired increase in vessel pressure or temperature observed.
Unexplained increase in any of the following:
RHR HX inlet temp
RHR HX outlet temp
RHR HX ESW inlet temp
RHR HX ESW outlet temp
Loss of ESW flow to the RHR HXs
Degraded/lost bus voltage
Lowering FPCC Surge Tank Level
Lowering Rx Water Level
Unexplained increase in DW, Cont, or FHB sump levels.
Unexplained increase in SP or Upper Pool levels
Unexplained increase in SFP temps
Loss of both FPCC pumps
Automatic Actions
RHR Isolation
STBY DGs start on LOOP, degraded voltage, or LOCA
FPCC Pumps trip when FPCC surge tank level < 8.5”
Immediate Actions
Note: The immediate actions of this ONI are associated with loss of DHR due to loss of fuel storage pool level, specifically when fuel is being.
1. Make announcement to evacuate all unnecessary personnel - Repeat announcement until access is controlled and all unnecessary personnel are evacuated.
2. Suspend core alts and ensure all fuel is in safe condition.
