Important Systems Flashcards
1
Q
How long are the 250 VDC Plant Batteries expected to last during a Loss of Off-site Power?
A
3 hours
2
Q
How long are the 250 VDC Plant Batteries expected to last during a Station Blackout?
A
4 hours
3
Q
What are the bus and Trains for the CRIDs?
A
CRID 1 - C
CRID 2 - D
CRID 3 - A
CRID 4 - B
4
Q
What is the normal power supply to the CRIDs?
A
250 V DC
5
Q
What are the autostarts for the MDAFPs?
A
Both MFPs Trip (w control switch in auto)
AMSAC
Loadshed
Lo-Lo SG Level (1 SG)
SI
6
Q
What are the TDAFP Auto Stared?
A
Undervoltage on RCP Bus
SG Lo-Lo (2 SGs)
AMSAC
7
Q
What does the AMSAC Signal do?
A
Trips the Turbine and Starts all AFW pumps
8
Q
What are the 3 autostarts of the CCW Pumps?
A
SI
Loadshed
Low discharge pressure (80#)
9
Q
On an SI, what flow do the RHR Hx CCW Outlet valves throttle to?
A
3000-3500 gpm
10
Q
What CCW Systems isolate on a Phase A?
A
SFP Hx
Excess LD
Rx Support Cooler
NBAE
11
Q
What are the ESF Loads for CCS?
A
RHR Hx RHR pp Seal Hx CTS pp Seal Hx SI pp LO SI pp Seal Hx CCP LO Cooler CCP Speed Increaser
12
Q
Does the control air compressor have a loadshed trip?
A
No
13
Q
What are the key pressures of the plant and control air systems?
A
100 # - Normal
95# - Standy PAC Stars
90# - CAC Starts (sensed in wet air receiver)
85# - PA Hdr Isolation Valves Close
80# - Manual Trip
14
Q
What signal stats the CTS Pumps?
A
Phase B
15
Q
What signal opens the CTS Pump Discharge valves and the SAT Outlet Valves?
A
CTS Signal
16
Q
What are the key levels and associated actions of QLC-451 for the VCT?
A
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
17
Q
What are the key levels and associated actions of QLC-452 for the VCT?
A
2.5% - VCT LO-LO Alarm + 1/2 of RWS signal
7% - Low Alarm
78% Divert Starts
87% Divert Stops
18
Q
WHat happens in the SVCS on a SI Signal?
A
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
19
Q
What is the pressure input for QMO-225, East CCP ELO?
A
NPP-155
1812-1825#
20
Q
What is the pressure input for the West CCP ELO?
A
NPP-153
1812-1825#
21
Q
What is the ECCS Acceptance Criteria?
A
Peak Clad Temp - < 2200*F
Max Cladding Oxidation - < 17%
H2 Generation - < 1%
Core maintains a coolable geometry
Long term abundant cooling
22
Q
What are the EDG Trips when needed for a SI or a LOOP with 250 VDC available?
A
Generator Phase Differential
Electronic Overspeed
Manual Push Button
23
Q
What are the EDG Trips without 250 VDC available?
A
Manual Fuel Valve on the Worthington module
Mechanical Overspeed
24
Q
If the EDG Electronic governor fails high, what happens?
A
EDG Speed will rise and machine will be controlled by the mechanical governor eventually
25
What is the status of the EDG during surveillance testing and why?
Inoperable bc it will not generate a loadshed signal
26
What happens if control air is lost to the EDG?
Throttle control cycle deer extends, forcing the fuel racks closed
27
What is the normal status of breaker BD?
OPEN
28
125 VDC supplies what?
Breaker / control power for the switchyard. EACH YARD HAS ITS OWN 125 VDC SUPPLY
29
What is TR-12-EP-1 designed to handle?
CTS in 1 unit and SBO in both units
30
What is the SDG sized for?
1 train of RCS Inventory Control in 1 unit
ESW, CCW, CCP, AFW, NESW, CAC
31
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
32
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
33
Explain Load Shed (UV)
2/3 sensed on EACH T-bus @ 94 (93) volts
2 second delay and bus specific
34
What are the ESW pump auto starts
SI (either unit, train specific
Load shed
Low hdr pressure - 40# (auto only)
35
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
36
What do the instrument power fuses power? When do they trip?
Instrument Power Supplies
Always trip unless bypassed or blocked
37
What do Control Power fuses power? And when do they cause a trip?
Bistables
Always unless blocked
38
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
39
What are the normal parameters of the PRT?
100*F
83% Level
3 #
40
PORV Cold Overpressure: NRV-152 is controlled by?
NPS-122 (Loop 1 WR)
41
When do the PRZ Backup Heaters trip?
Loadshed
PRZ Low Level at 17% (hot cal)
Over current
42
What is the PRZ Pressure Safety Limit?
2735 psig
43
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%
44
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%
45
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%
46
What happens if PRZ Level Bistable channel fails high?
NOTHING!
47
What happens if PRZ Pressure Controlling channel fails high?
All PRZ Htrs Off
Sprays full open
1/2 signal for NRV-152 present
Actual PRZ Pressure decreases
48
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
49
What happens if the PRZ Pressure bistable channel fails high?
1/2 actuation signals present for NRV-151 and 153 present
50
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
51
What are the RCP Power supplies?
1 - B
2 - C
3- D
4 - A
52
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 gpm flows up thru #2 seal
100 cc/hr flows up thru #3 seal
53
What is the RCP Seal Return Flowpath?
#1 Seal - Seal Water Hx to CCP Suction
#2 Seal - RCP Standpipe and to RCDT
#3 Seal - RCDT
54
What is used for the Subcooling Meter Calc?
Auctioneered HI CETCs or WR RTD Temps
Auctioneered LO RVLIS Pressure (used bc outside containment)
55
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
56
What are the interlocks to open IMO-340, RHR to CCP / SI Suction?
ICM-305, RHR Suction from Recirc Sump - Open
IMO-252 or IMO-263, SI Recirc to RWST - Closed
57
What are the interlocks to Open IMO-330, RHR to Upper Spray?
ICM-305, RHR Suction from Recirc - OPEN
58
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
59
A logic cabinet urgent failure effects which rods?
ALL Rods
60
A Power cabinet Urgent Failure affects which Rods?
Groups for that specific cabinet
61
Loss of redundant power to power or logic cabinets for control rods is what kind of failure?
Non Urgent
62
How fast do rods move in auto?
8-72 spm
Error 1/5*-3*F, 8 spm
Error 3-5*F, 32 steps per degree +8
63
How fast do rods move for shutdown banks in manual?
62 spm
64
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
65
How will a PR NI low failure affect rods?
No effect unless affected instrument was previously the auctioneered high
66
How will MPC-253 failing high affect Rods?
Power Rate of change and Tavg < Tref causes rods to step out
67
How will MPC-253 failing low affect Rod?
Power Rate of change and Tavg > T ref causes rods to step in
68
How will Tavg failing high affect Rods?
Tavg > Tref causes rods to step in
69
For SSPS, loss of both 15 VDC OR both 48 VDC power supplies does what?
Generated Rx Trip
70
CRID 1 supplies which train of slave relays?
A
71
CRID 4 supplies which train of slave relays?
B
72
A loss of CRIDs 1 or 4 prevents what?
Actuation of ESF equipment on that associated train
73
For SSPS Bistable Test Switches, what does it do for the logic?
Gives SSPS the trip signal
74
What is unique with CTS Bistables?
Bypassed instead of placed in test, to ensure we don’t have an inadvertent CTS
75
When the RPS Bypass switches are in bypass, what happens?
Never get a trip signal
76
Do RX Trip Bypass breakers have Shunt coils?
NO
77
How do the Rx Trip Breakers Trip Coils work?
Energized to trip
78
How do the Rx Trip Breakers UV Coils work?
De-Energized to Trip (48 VDC from SSPS)
Do NOT Need control power
79
How do the Rx Trip Breakers Shunt Coils work?
Energize to Trip
80
What are the inputs for OT delta T?
Delta T
Tave
AFD
PRZ Press
81
What does OT Delta T Protect from?
DNB
82
What are the inputs for OP delta T?
Delta T
Tave
83
What does OP delta T protect from?
KW/ft
84
What is the turbine trip / load rejection steam dump controlled based on?
Auctioneered high Tavg
85
What is C-7A?
10% load rejection on MPC-254
86
What is C-7B?
30% Load rejection on MPC-254
87
What is C-8?
TT Arming Signal
4/4 MT SV Closed
OR
2/3 Oil Pressure switches below 800 psig
88
What is C-9?
Blocking Signal:
1 CW Pump
CRID 2
3/3 Condensers >20.6” hg
89
What is P-12?
Blocking Signal
2/4 Tavg < 541*F
Blocks steam dump until placed in Bypass Interlock
90
What does Steam Dump Bypass Interlock do?
Allows group 1 operation below P-12
91
For the TT Controller, what are the temperature differences for each group to be tripped open?
10*F - 1 group
20*F - 2 groups
92
How many groups of steam dumps will you get maximum on a turbine trip?
2 groups
93
How many groups of steam dumps will you get maximum on a Load Rejection?
3 groups
94
What is C-20?
2/2 Turbine Impulse Pressures > 40%
95
What is needed for an AMSAC Actuation?
3/4 FF < 25%
96
What are the auto-starts for an AES Fan?
ECCS/CTS Pump Start
| SI
97
What will happen on a loss of BOTH Unit 1 AX Fans?
12-RRV-306 closes
98
What starts the CCW Pump Fans?
Manual
Load Cons
99
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
100
What will place the AFX Charcoal Filter I/S?
SFP High Rad / Airborne
Loss of power to EITHER fain
Loss of Control air
101
What fans trip on Phase B?
CLVs
CRDM Fans
PRZ Fans
Rx Cavity Fans
102
What will start ALL CRP Fans?
SI in either unit
103
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
104
What will be affected if a PR detector fails low?
OTDT setpoint will lower
105
Will a high rad signal place an AES Fan charcoal filter in service?
No. This must be done manually
106
If a 1 RCS Loop flow lowers in comparison to all others, what would the result be?
Reactor core margin to DNB will be lower
107
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
108
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
109
What does the TDAFP Discharge Flow High Alarm mean?
AFW Flow Retention has actuated
110
Where does the PRT vent to and what is the interlock?
Waste Gas Header
Pressure must be < 10 psig
111
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
112
Can the Backup Plant Air Compressor feed both unit’s control air headers?
Yes, it wil discharge to both unit’s CA Systems
113
Do both reactor trip breakers and reactor trip bypass breakers have shut coils?
NO- Only Rx Trip Breakers do
114
Is the CCW thermal barrier isolation valve common to all RCPs? Or does each have its own?
Common to ALL
115
If CCW to the RCP thermal barrier is lost, must you trip the affected RCPs?
NO, as long as it has seal injection maintained
116
To calculate MFP DP, what are the inputs used?
Highest of the low pressure (steam) and Lowest of the high pressure (FW)
117
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
118
If CRID 1 is lost, what happens?
Train A SSPS output relays won’t work.
Manual red switches will not work to actuate SI.
119
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
120
Which CRID does NOT supply power to the Steam Dump System?
CRID 3
121
What would cause a load cons signal to be generated for the CD EDG?
Train A SI with a LOOP/Loadshed
