Important Systems Flashcards
How long are the 250 VDC Plant Batteries expected to last during a Loss of Off-site Power?
3 hours
How long are the 250 VDC Plant Batteries expected to last during a Station Blackout?
4 hours
If the CRID is being powered from CRP-3, what’s the status of the CRID Bus?
Inoperable
What are the bus and Trains for the CRIDs?
CRID 1 - C
CRID 2 - D
CRID 3 - A
CRID 4 - B
What does it mean when the NSYNC Light goes out?
The alt source of power is gone
What is the normal power supply to the CRIDs?
250 V DC
What are the autostarts for the MDAFPs?
Both MFPs Trip (w control switch in auto)
AMSAC
Loadshed
Lo-Lo SG Level (1 SG)
SI
What are the TDAFP Auto Stared?
Undervoltage on RCP Bus
SG Lo-Lo (2 SGs)
AMSAC
What does the AMSAC Signal do?
Trips the Turbine and Starts all AFW pumps
What is the TS Minimum and Basis of the CST?
182,000 gals (44%)
Maintains plant in hot standby for 9 hours onPORVs w LOOP
What are the 3 autostarts of the CCW Pumps?
SI
Loadshed
Low discharge pressure (80#)
What does a high rad signal do for CCW?
Auto closes surge tank vent valve CRV-412
On an SI, what flow do the RHR Hx CCW Outlet valves throttle to?
3000-3500 gpm
What CCW Systems isolate on a Phase A?
SFP Hx
Excess LD
Rx Support Cooler
NBAE
What are the ESF Loads for CCW?
RHR Hx RHR pp Seal Hx CTS pp Seal Hx SI pp LO SI pp Seal Hx CCP LO Cooler CCP Speed Increaser
Does the control air compressor have a loadshed trip?
No
What are the key pressures of the plant and control air systems?
100 # - Normal
95# - Standy PAC Stars
90# - CAC Starts (sensed in wet air receiver)
85# - PA Hdr Isolation Valves Close
80# - Manual Trip
Which Rad monitors will close the 100 series valves (inside containment) and trip the IR Purge supply fan?
Train A 00 Odd Rad Monitors (ex: 1300)
Which Rad Monitors will close the 200 series valves (outside containment) and trip the majority of the ventilation supply fans?
Train B- Even Rad Monitors (Ex: 1400)
What are the Tech Spec Temperature Limits for upper and Lower Containment?
Upper: 60-100*F
Lower: 60-120*F
What are the Tech Spec Pressure limits for containment? And what must be done if outside limits?
- 1.5 to +0.3 psig
* Restore within limits within 1 hour
What signal starts the CTS Pumps?
Phase B
What signal opens the CTS Pump Discharge valves and the SAT Outlet Valves?
CTS Signal
What are the key levels and associated actions of QLC-451 for the VCT?
2.5% - Low-Low Alarm and half RWS signal
14% - Auto Makeup Starts + Low Alarm + MU Not in Auto Alarm
24% - Auto Makeup Stops
87% - Divert Trips Open + High Alarm
What are the key levels and associated actions of QLC-452 for the VCT?
2.5% - VCT LO-LO Alarm + 1/2 of RWS signal
7% - Low Alarm
78% Divert Starts
87% Divert Stops
What happens in the CVCS on a phase A Signal?
LD Orifice Valves CLose
LD CIVs Close
Seal Return Valves CLose
CCW to XS LD Hx
What happens in the CVCS on a SI Signal?
Charging Hdr Iso Valves Close
CCW to LD Hx Closes
CCP Recircs Close and throttle based on pressure
CCP Suction realigns to RWST
BIT Valves Open
CCP Starts
During an Emergency Boration, what must be done with the BAT Pumps?
Manually shifted to FAST Speed
What is the pressure input for QMO-225, East CCP ELO?
NPP-151
1812-1825#
What is the pressure input for the West CCP ELO?
NPP-153
1812-1825#
What must be done if your SDM is outside the COLR limits?
M2 w Keff <1
M2-5
Borate to restore in 15 mins
What are the Tech Spec Limits for the RWST?
375,500 gals
2400-2600 ppm boron
70-100*F
What is the ECCS Acceptance Criteria?
Peak Clad Temp - < 2200*F
Max Cladding Oxidation - < 17%
H2 Generation - < 1%
Core maintains a coolable geometry
Long term cooling
What are the EDG Trips when needed for a SI or a LOOP with 250 VDC available?
Generator Phase Differential
Electronic Overspeed
Manual Push Button
What are the EDG Trips without 250 VDC available?
Manual Fuel Valve on the Worthington module
Mechanical Overspeed
If the EDG Electronic governor fails high, what happens?
EDG Speed will rise and machine will be controlled by the mechanical governor eventually
What is the status of the EDG during surveillance testing and why?
Inoperable bc it will not generate a loadshed signal
What happens if control air is lost to the EDG?
Throttle control cycle deer extends, forcing the fuel racks closed
What is the normal status of breaker BD?
OPEN
What does TR-5 supply?
Train B reserve feed for both units
What does TR-9 supply?
Train A Reserve Feed for both units
125 VDC supplies what?
Breaker / control power for the switchyard. EACH YARD HAS ITS OWN 125 VDC SUPPLY
What is TR-12-EP-1 designed to handle?
CTS in 1 unit and SBO in both units
What is the SDG sized for?
1 train of RCS Inventory Control in 1 unit
ESW, CCW, CCP, AFW, NESW, CAC
What does the anti-pumping circuit do?
Prevents breaker from attempting a second closure w a standing close signal when the first attempt was followed by a trip open signal
Explain degraded bus voltage.
2/3 T busses sensed 113 V (ONLY sensed on A + D busses)
9 sec delay w SI / SG LO-LO opens T buse feeders
+ 90 sec auto transfer to RATS
+21 secs open T bus Feeders
Train Specific
Opens BOTH RCP Bus Ties for associated train
Explain Load Shed (UV)
2/3 sensed on EACH T-bus @ 94 (93) volts
2 second delay and bus specific
What are the ESW pump auto starts
SI (either unit, train specific
Load shed
Low hdr pressure - 40# (auto only)
What do the ESW from CCW Hx valves throttle to on a SI
~5500 gpm
Adjustments can be made after the valves throttle if necessary
What are the MFP Trips
Manual
Rx Trip
SI
Hi Hi SG Level
IPS
Thrust Bearing Wear
What do the instrument power fuses power? When do they trip?
Instrument Power Supplies
Always trip unless bypassed or blocked
What do Control Power fuses power? And when do they cause a trip?
Bistables
Always unless blocked
What kind of detectors are the SR Detectors?
BF3 Proportional Counters
What kinda of detectors are the IR Detectors?
Compensated Ion Chamber
What kind of detectors are the PR detectors?
Uncompensated Ion Chamber
What kind of detectors are the gammametrics?
Fission Chamber (U235)
Where can N-23, SR Gammametrics be read? What powers it?
Control Room or LSI-4
Opposite Units CRID 3
What happens if your IR Detector is undercompensated?
Gives a false High Indication. Can cause IR current to stay above the P6 setpoint when coming down in power, which will prevent the SR Detectors from Auto energizing
What must be done if your AFD is not within Target band?
Restore within 15 mins
If not met, restore to within upper limit (90%) within 15 mins
What must be done if you’re outside the acceptable region at 80% power?
Reduce to 50% power in 30 mins
What are the normal parameters of the PRT?
100*F
83% Level
3 #
PORV Cold Overpressure: NRV-152 is controlled by?
NPS-122 (Loop 1 WR)
PORV Cold Overpressure: NRV-153 is controlled by?
NPS-121, Loop 2 WR
When do the PRZ Backup Heaters trip?
Loadshed
PRZ Low Level at 17% (hot cal)
Over current
What is the RCS T.S. Safety Limit (from SL section of TS)?
2735 psig
What happens if a PRZ Level Control Channel Fails Low?
QRV-251 throttles open to increase level
LD Isolates (QRV-112 + all orifices)
PRZ Htrs Off
Rx Trips at 92%
What happens if PRZ Level Bistable channel fails Low?
LD Isolates (QRV-111)
PRZ Htrs Off
PR Pressure Decreases due to heaters being off
Actual level increases, charging to min
Rx Trips at 92%
What happens if the PRZ Level control channel fails high?
QRV-251 throttles closed to lower level
PRZ Htrs com on (+5% deviation)
Actual Level decreases and at 17%, Orific isolation valves close, QRV-111 closes, and heaters turn off
Actual Level increases (min charging w no let down)
Rx Trips at 92%
What happens if PRZ Level Bistable channel fails high?
NOTHING!
What happens if PRZ Pressure Controlling channel fails high?
All PRZ Htrs Off
Sprays full open
2/3 signal for NRV-152 present
Actual PRZ Pressure decreases
What happens if PRZ Pressure Controlling channel fails low?
Backup eaters in auto will turn on
Cycling Htrs full on
Actual PRZ Pressure rises
NRV-152 is inoperable
If channel 3 was in control. ALL PORVS inoperable
What happens if the PRZ Pressure bistable channel fails high?
2/3 actuation signals present for NRV-151 and 153 present
What happens if the PRZ Pressure bistable channel fails low?
NRV-151 + 153 inoperable
If channel 4 was the bistable, then ALL PORVs are inoperable
What are the interlocks for starting a RCP?
Bearing Lift Pump running
Bearing Lift Oil Pressure 510#
What are the RCP Power supplies?
1 - B
2 - C
3- D
4 - A
Assuming 8 gpm Seal Injection, what is the seal injection flowpath?
5 gpm flows down RCP Shaft into the RCS
3 gpm flows up thru #1 seal
3 gph flows up thru #2 seal
100 cc/hr flows up thru #3 seal
What is the RCP Seal Return Flowpath?
1 Seal - Seal Water Hx to CCP Suction
Which RVLIS is used when filling and venting the RCS with the RCP Bump Method?
Upper Plenum, with RCPs off
What is used for the Subcooling Meter Calc?
Auctioneered HI CETCs or WR RTD Temps
Auctioneered LO RVLIS Pressure (used bc outside containment)
What is the heat up limit?
60*F per hour
What is the Cooldown limit?
100*F / hr
What are the interlocks to open ICM-305/306, RHR Suction from the Recirc Sump?
IMO-310, RHR Suction Valves - Closed
IMO-215, RWST to CTS Pump - Closed
What are the interlocks to open IMO-340, RHR to CCP / SI Suction?
ICM-305, RHR Suction from Recirc Sump - Open
IMO-262 or IMO-263, SI Recirc to RWST - Closed
What are the interlocks to Open IMO-330, RHR to Upper Spray?
ICM-305, RHR Suction from Recirc - OPEN
What are the interlocks to open IMO-310, RHR Suction Valves?
ICM-305, RHR Suction from Recirc Sump - Closed
IMO-340, RHR to CCP / SI Suction - Closed
IMO-330, RHR to upper Spray - Closed
What happens on a high rad on R-5 or VRS-5005/5006, SFP Area Rad Monitors?
Trips AFS Fans
Puts AFX Fan in charcoal mode
What happens on a high rad on DRA-300 + DRA-353, Blowdown Rad monitor?
Closes Blowdown DCRs
Closes BD Sample DCRs
Closes DRV-350
Trips BD Treatment pump (DRA-353 ONLY)
What happens on a high rad on the liquid effluent Rad Monitor RRS-1001?
Closes RRV-285
Monitor Tank Pumps Trip
WECT Pumps Trip
What does a high alarm on the SJAE and GSLO rad monitors mean?
Possible SGTR on EITHER unit (based on which unit is supplying aux steam)
What happens on a high rad signal on the vent effluent Rad Monitor VRS-1500/2500?
RRV-306 closes (low range 1505)
What happens on a High Rad on the CR Area rad monitors ERS-7401 / 8401?
Starts THAT UNIT Control Room Pressurization Fan
Dampers realign
How many SG PORV Rad Monitors and Detectors are there?
2 Monitors, 4 detectors
A logic cabinet urgent failure effects which rods?
ALL Rods
A Power cabinet Urgent Failure affects which Rods?
Groups for that specific cabinet
While restoring a mis-aligned Rod, why will a urgent failure be generated?
The other bank of rods in that power cabinet due to all lift coil disconnect switches being open for that entire group
Loss of redundant power to power or logic cabinets for control rods is what kind of failure?
Non Urgent
What powers Rod Bottom Lights?
CRP-3
How fast do rods move in manual?
48 spam
How fast do rods move in auto?
8-72 spm
Error 1/5-3F, 8 spm
Error 3-5*F, 32 steps per degree +8
How fast do rods move for shutdown banks in manual?
62 spm
If a PR NI fails high, what is the effect on rods?
Power Rate of change causes rods to step in, but rod stop C2 will prevent rods from stepping back out on the temperature error in both auto and manual
How will a PR NI low failure affect rods?
No effect unless affected instrument was previously the auctioneered high
How will MPC-253 failing high affect Rods?
Power Rate of change and Tavg < Tref causes rods to step out
How will MPC-253 failing low affect Rod?
Power Rate of change and Tavg > T ref causes rods to step in
How will Tavg failing high affect Rods?
Tavg > Tref causes rods to step in
Will cross-tying SFP Cooling thru the purification piping prevent boiling?
No, it will delay it
For SSPS, loss of both 15 VDC OR both 48 VDC power supplies does what?
Generated Rx Trip
CRID 1 supplies which train of slave relays?
A
CRID 4 supplies which train of slave relays?
B
A loss of CRIDs 1 or 4 prevents what?
Actuation of ESF equipment on that associated train
For SSPS Bistable Test Switches, what does it do for the logic?
Gives SSPS the trip signal
What is unique with CTS Bistables?
Bypassed instead of placed in test, to ensure we don’t have an inadvertent CTS
When the RPS Bypass switches are in bypass, what happens?
Never get a trip signal
Do RX Trip Bypass breakers have Shunt coils?
NO
How do the Rx Trip Breakers Trip Coils work?
Energized to trip
How do the Rx Trip Breakers UV Coils work?
De-Energized to Trip (48 VDC from SSPS)
Do NOT Need control power
How do the Rx Trip Breakers Shunt Coils work?
Energize to Trip
What are the inputs for OT delta T?
Delta T
Tave
AFD
PRZ Press
What does OT Delta T Protect from?
DNB
What are the inputs for OP delta T?
Delta T
Tave
What does OP delta T protect from?
KW/ft
What is the turbine trip / load rejection steam dump controlled based on?
Auctioneered high Tavg
What is C-7A?
10% load rejection on MPC-254
What is C-7B?
30% Load rejection on MPC-254
What is C-8?
TT Arming Signal
4/4 MT SV Closed
OR
2/3 Oil Pressure switches below 800 psig
What is C-9?
Blocking Signal:
1 CW Pump
CRID 2
3/3 Condensers >20.6” hg
What is P-12?
Blocking Signal
2/4 Tavg < 541*F
Blocks steam dump until placed in Bypass Interlock
What does Steam Dump Bypass Interlock do?
Allows group 1 operation below P-12
For the TT Controller, what are the temperature differences for each group to be tripped open?
10*F - 1 group
20*F - 2 groups
What is T no load?
547*F
How many groups of steam dumps will you get maximum on a turbine trip?
2 groups
How many groups of steam dumps will you get maximum on a Load Rejection?
3 groups
What is C-20?
2/2 Turbine Impulse Pressures > 40%
What is needed for an AMSAC Actuation?
3/4 FF < 25%
What is SG Shrink caused by?
Reduction in Steam flow
What is SG Swell Caused by?
Raised Steam Flow
What are the operational Modes based on?
Keff
% Rated Thermal Power
RCS Tavg
WHat are the 6 modes of operation?
1 - Power Operation. Keff >/= 0.99, >5% Thermal Power
2- Startup. Keff >/= 0.99, =5% Thermal Power
3- Hot Standby. Keff <0.99, Tavg >/= 350*F
4- Hot Shutdown. Keff <0.99, Tave between 200-350*F
5- Cold Shutdown. Keff <0.99, Tavg =200*F
6- Refueling.
What are the auto-starts for an AES Fan?
ECCS/CTS Pump Start
SI
What will happen on a loss of BOTH Unit 1 AX Fans?
12-RRV-306 closes
What starts the CCW Pump Fans?
Manual
Load Cons
What will place the AES Charcoal Filter I/S?
Phase B (either Train)
AES Fan C/S in Stop (that fan only)
Loss of power to EITHER AES Fan
Loss of Control Air
What will place the AFX Charcoal Filter I/S?
SFP High Rad / Airborne
Loss of power to EITHER fain
Loss of Control air
What fans trip on Phase B?
CLVs
CRDM Fans
PRZ Fans
Rx Cavity Fans
What will start ALL CRP Fans?
SI in either unit
What will the CRP fan damper positions be for a cable vault fire?
CRAC Outside Supply 1/1A- Closed
CREV Outside Supply 2/2A- Part Open for 1, other is closed
CR Recirc 3 - Closed
What will be affected if a PR detector fails low?
OTDT setpoint will lower
Will a high rad signal place an AES Fan charcoal filter in service?
No. This must be done manually
If one RCS Loop flow lowers in comparison to all others, what would the result be with respect to DNB
Reactor core margin to DNB will be lower
If the EDG Emergency Trip pushbutton is inadvertently pressed in the control room while the EDG is actually needed, how must you restart it?
Reset the HEA Relay in the control room
The primary function of the Ice Condenser is to ____________ to less than the design limit following a ________ or a _______
Limit peak pressure
following a LOCA or a Steam Line Break
What does the TDAFP Discharge Flow High Alarm mean?
AFW Flow Retention has actuated
If control power is lost to a closed in pump breaker, can you trip the breaker from the control room? Will automatic trip functions work?
NO! Only tripped locally
Automatic trips are NOT overable
Where does the PRT vent to and what is the interlock?
Waste Gas Header
Pressure must be < 10 psig
What modes must 4 accumulators be operable?
M1 and M2
M3 > 1000#
What are the Tech Spec limits for Accumulator volume, pressure and boron?
Volume - 921-971 cubic feet
Pressure - 585-658 psig
Boron - 2400-2600 ppm
Why do operators care about the SAT LO-LO Level alarm during a LOCA?
The spray add tank outlet valves and educator supply valves may not have closed automatically. This could cause damage to the CTS Pumps due to the resulting gas addition
What’s the flow path that would detect a SG tube leak thru Gland Steam Condenser Vent Rad monitor?
A PORTION of the fission products will be monitored before being transmitted to atmosphere, as only a sample flow passes thru SRA-1800
Can the Backup Plant Air Compressor feed both unit’s control air headers?
Yes, it wil discharge to both unit’s CA Systems
With refueling in progress, SR audible count rate has became inoperable in both containment and in the control room. What is the TS action required for these conditions?
IMMEDIATELY initiate actions to isolate unborated water sources to the RCS
What will cause a monitor tank pump to trip during a liquid release?
RRS-1001, Hi Rad
RRS-1000, Failure
RFS-1010/1011, High / Low Rad Monitor Sample Flow
Low Monitor Tank Level, if selected
What is the power supply for H2 Recombiners?
Recombiner 1: 11B (21B)
Recombiner 2: 11C (21C)
What are the Tech Spec Parameters for the RWST? Volume, Boron concentration, and Temp
Volume - 375,500 gals
Boron - 2400-2600 ppm
Temp - 70-100*F
Do both reactor trip breakers and reactor trip bypass breakers have shut coils?
NO- Only Rx Trip Breakers do
What are the key numbers for Generator frequency?
> 59 Hz, unlimited operating time
< 59 Hz but > 58.2 Hz, reduce power to approx. 50 MWe within 30 mins and open generator output breakers
= 58.2 Hz, Immediately Trip the Rx
What will trip closed 12-RRV-306
- Loss of both U1 Aux Bldg Exhaust Fans
- High Rad on U1 or U2 Vent Stack Rad Monitors VRS-1500/2500
What happens if during power escalation, you exceed 60% power (and 626 MW) with only 1 FP I/S?
When you exceed 626 MW, a runback will initiate
Is the CCW thermal barrier isolation valve common to all RCPs? Or does each have its own?
Common to ALL
If CCW to the RCP thermal barrier is lost, must you trip the affected RCPs?
NO, as long as it has seal injection maintained
To calculate actual MFP DP, what are the inputs used?
Highest of the low pressure (steam) and Lowest of the high pressure (FW)
What can force a MFP to speed control?
Both MS Press Xmitters Fail
Both MFP Hdr Press Xmitters Fail
MFP dP Setpoint Xmitter Fails
Other MFP Trips when > 60% Power
MFP Speed > 5220 (5300) rpm
What is the Tech Spec limit for the EDG Day Tank Level?
101.4 gallons
If you receive a high alarm on VRS-1505, AB Ventilation Noble Gas Activity Monitor while containment Purge System is in Ventilation Mode, what must be done?
Stop Purge and talk w RP
Auto isolation signals are blocked while in ventilation mode
How do the RHR Hx Outlet valves (IRV-320 and IRV-310) fail on a loss of air?
Open!
This raises flow thru the Hx, raising the cooldown rate
If CRID 1 is lost, what happens?
Train A SSPS output relays won’t work.
Manual red switches will not work to actuate SI.
When an RCP Trips, how do Thot and Tcold respond in that loop?
Reverse flow causes Thot to drop to the Tcold value or slightly below
T cold remains about the same at low power
Which CRID does NOT supply power to the Steam Dump System?
CRID 3
What would cause a load cons signal to be generated for the CD EDG?
Train A SI with a LOOP/Loadshed
What will cause 12-RRV-285 to trip?
RRS-1001 Hi Rad
RRS-1000 Failure
High & Low Radiation Monitor Sample Flow
(RFS-1010, RFS-1011)
What will cause 2-RRV-286/1-RRV-287 to trip?
NO Circ Water Pumps are running in associated unit
What happens to an ECCS pump with a standing SI signal if a LOOP occurs
- Any pumps that have a start signal from an SI will strip and then re-sequence on.
- IF pumps had to be manually started due to failure of SI to start them, they WILL NOT restart
What happens with high radiation on DRA-300/353
- Blowdown Isolation Valves Close (DRA-300/353)
- Blowdown Sample Valves Close (DRA-300/353)
- Blowdown to Turbine Room Sump DRV-350 Closes (DRA-300/353)
- Blowdown Treatment Pump Trips (DRA-353 ONLY)
What inputs into the Rod Insertion Limit recorder
- Delta T Power
What happens when an AMSAC FF input fails high
- FF input to AMSAC is hardwired
- Coincidence becomes 3/3
What does it mean if the boric acid filter dP alarm comes in and is still standing after the BAT PP is placed in fast speed
- The Emergency Boration flow path is inoperable
- Have AEO bypass the filter
