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#