Systems Final Review Flashcards
(163 cards)
1
Q
How does a Deluge System work and what systems/rooms use this type of Fire Protection?
A
a) Deluge System (Aux boiler, H2 Seal Oil Units, RFPT rooms, RFP oil cond, U2 EHC room, all filter trains)
* *i) A deluge system is used in areas where SEVERE, fast spreading fire might occur**
(1) Employs open sprinkler heads attached to piping connected to a water supply through a valve that is opened upon actuation of a fire detection system in the same area as the sprinklers (or manually)
(2) When valve opens, water flows into associated piping and discharges from all open sprinklers instantly
(3) Deluge valve is differential type valve that depends upon water pressure in diaphragm chamber to hold clapper closed against water supply pressure
(a) Loss of pressure in diaphragm chamber results in clapper opening permitting flow to piping and spray heads
(i) Any leakage past clapper valve is detected by flow from ball drip valve
1. Functions as leak detection device when system in standby
2. If clapper valve opens, spring plug in ball drip valve closes
(4) All filter train deluge systems are not connected to source of water
(a) To use deluge system on filter trains, connect 1 ½” Fire Hose to hose connection on exterior of filter, pressurize hose, and open deluge system manual isolation valve
2
Q
How does a Fixed Water Spray System work and what systems/rooms use this type of Fire Protection?
A
b) Fixed Water Spray System (switchyard transformers, shunt reactors, Intake Structure)
i) Network of piping that provides water to DIRECTIONAL SPRAY NOZZLES actuated automatically or manually
ii) Identical to Deluge System except it has open directional nozzles in spray header not open sprinkler heads
(1) Intake structure has closed head fixed water spray system
3
Q
How does a Wet Pipe Sprinkler System work and what systems/rooms use this type of Fire Protection?
A
c) Wet Pipe Sprinkler System (FP pump house, HPCI/RCIC rooms, cableways, U1 EHC room, Warehouse 6)
i) Auto closed head sprinklers containing water and connected to water supply so water discharges onto fire
(1) Wet pipe sprinkler system piping is pressurized to fire main pressure
(2) Heat activated sprinkler heads open if ambient temperature reaches specified temperature indicating fire
(3) Sprinkler heads are non-reusable and must be replaced after actuation
(4) Uses component called retard chamber to help prevent nuisance fire alarms
(a) Retard chamber designed to accumulate excess flow generated by pressure surges in system
4
Q
How does a Dry Pipe Sprinkler System work and what systems/rooms use this type of Fire Protection?
A
d) Dry Pipe Sprinkler System (Warehouse 1-5, LLRW, Dry Waste storage)
i) Auto closed head sprinklers attached to piping containing air under pressure, release of which through open sprinkler permits water to open dry pipe valve releasing water into piping and out open sprinkler
(1) Consists of riser pressurized with water up to clapper valve
(a) Air pressure between clapper valve and closed sprinkler heads holds clapper closed
(2) Heat activated sprinkler heads open if ambient temperature reaches specific temperature
(3) When sprinkler head opens, air bleeds off downstream side of clapper valve thru sprinkler head allowing clapper valve to open, spraying water on affected area
ii) Dry pipe system used to PREVENT FREEZING of pipes during cold weather
5
Q
How does a Preaction Sprinkler System work and what systems/rooms use this type of Fire Protection?
A
e) Preaction Sprinkler System
i) Auto closed head sprinklers containing air that may or may not be under pressure with fire detection system installed in same area as sprinklers
(1) Fire detection system actuation opens valve permitting water flow into piping discharge thru all open sprinklers
(2) Unlike deluge or fixed spray system, loss of air pressure does not activate clapper valve
(3) Requires combination of TWO SIGNALS TO INITIATE
(a) Fire detector used to actuate clapper valve
(b) Sprinkler heads melt on high temperature directing spray on affected area
(4) Used where accidental water spray would cause excessive damage in area sprayed
6
Q
What actions are prevented when an EDG is placed in TEST?
A
a) Placing a EDG to TEST results in the following
i) Locks out associated EDG automatic start
ii) Prevents AUTO close of associated EDG output breaker
iii) Allows paralleling of associated EDG with either its normal or alternate power supply
iv) TEST NO MANUAL for station service buses
(1) Cannot manually transfer SS buses from normal to alt (fast transfer still works)
(2) Can manually transfer SS buses from alt to normal
v) TEST NO AUTO for emergency buses
(1) Emergency bus (associated) will not auto transfer to alternate on UV
(2) Arms additional EDG trips
7
Q
What situations cause an EDG to be knocked out of TEST?
A
1) Loss of power to the ALTERNATE SAT for the associated 4160 Emergency Bus
2) LOCA Signal
8
Q
What are the normal EDG trip signals? What if the EDG is in TEST?
A
Anytime: SOLD Start Failue - <250 rpm or <6 psig oil pressure 7s after start Over speed - 1000+/- 10 rpm Low Lube Oil Pressure - 21 (18) psig Differential Lockout
TEST: PORCH Pushbutton - with EDG output bkr open Oil (lube) Temp Hi - 230 F Reverse Power Crankcase Pressure Hi - .5" H2O Hi Temp or Low Pressure (Jacket Water) - 205 F or 9 (10) psig
9
Q
For the Vital AC system, what does the Static Bypass Switch (Static Transfer Switch) do?
A
Used to auto transfer Vital AC bus to its alternate AC power supply
i) Transfer happens within a fraction of a cycle (no loss of power should occur)
10
Q
For the Vital AC system, what does the Return Mode Switch (U2) do?
A
Controls the auto swap function for the inverter during a power loss from the inverter
i) If left in the “AUTO” position, Vital AC auto transfers back to inverter when power is restored to the inverter
ii) If placed in the “MANUAL” position, Vital AC system will remain aligned to the Alternate power source until manually transferred back to the inverter in the event a power loss occurs form the inverter pathway.
11
Q
For the Vital AC system, what does the Sync Monitor Light being illuminated mean?
A
ii) Sync Monitor light is ON when the Inverter output voltage is OUT OF PHASE w/ Bypass AC Voltage
iii) Do NOT operate Test Switch to ALT LINE position if Sync Monitor light is ILLUMINATED
12
Q
What major functions and instruments are lost if the 125/250 VDC Switchgear “A”
(R22-S016) is de-energized?
A
- Generator PCBs will not auto open on Turbine Trip (4 mins allowed for opening the PCBs, unless the exciter field breaker is open or exhaust hood spray is not functioning properly)
- Once PCBs are opened, SS 4160 buses will de-energize b/c no control power (will not swap)
- RCIC not available and all indication for DC power loads are lost
- Station Service 4160V will not fast transfer.
- C32-R606B – “B” GEMAC RWL Indicator lost
- C32-R605B – “B” GEMAC Pressure Indicator lost
- C32-R603B – “B” Steam Flow Indicator lost
- C32-R604A – “A” Feed Flow Indicator lost
• Unit 2
o RFPT 2A and 2B will not trip manually or automatically due to loss of power to their trip circuits. Local trip is required
o 2E, 2F, and 2G will not fast transfer from norm to alternate
• Unit 1
o 1B Recirc pump will not trip manually or automatically due to loss of input breaker control power. Local trip is required.
o RFPT 1A will not trip manually or automatically due to loss of power to its trip circuit. Local trip is required.
13
Q
What major functions and instruments are lost if the 125/250 VDC Switchgear “B”
(R22-S017) is de-energized?
A
- HPCI is not available and all indication for DC power loads are lost
- C32-R606C – “C” GEMAC RWL Indicator lost
- C32-R605C – “C” GEMAC Pressure Indicator lost
- C32-R603C – “C” Steam Flow Indicator lost
- C32-R604B – “B” Feed Flow Indicator lost
• Unit 2
o Control power is lost to BOTH ASD bkrs (neither pump can be tripped from the MCR, shutdown button still functions)
• Unit 1
o 1A Recirc pump will not trip manually or automatically due to loss of input breaker control power. Local trip is required.
o RFPT 1B will not trip manually or automatically due to loss of power to its trip circuit. Local trip is required.
14
Q
What major functions and instruments are lost if the 125 VDC Cabinet “A”
(R25-S001) is de-energized?
A
- Generator PCBs will not auto open on Turbine Trip (4 mins allowed for opening the PCBs, unless the exciter field breaker is open or exhaust hood spray is not functioning properly)
- RCIC not available
- Rx Instruments similar to R22-S016
- Loss of control power to 4160 ‘A’ and ‘B’ supply breakers. They will not fast transfer to startup supply on loss of norm
- Loss of control power to 600 ‘C’
• Unit 2
o RFPT 2A will not trip manually or automatically due to loss of power to their trip circuits. Local trip is required
o 2E, 2F, and 2G will not fast transfer from norm to alternate
• Unit 1
o RFPT 1A will not rip manually or automatically due to loss of power to its trip circuit. Local trip is required.
15
Q
What major functions and instruments are lost if the 125 VDC Cabinet “B”
(R25-S002) is de-energized?
A
• HPCI not available
- Rx Instruments similar to R22-S017
- Loss of control power to 4160 ‘A’, ‘B’, ‘C’, and ‘D’ feeder breakers
- Loss of control power to 600 ‘D’
• Unit 2
o 2A and 2B Recirc Pumps will not trip manually or automatically due to loss of input breaker control power. Local trip is required
• Unit 1
o 1A Recirc pump will not trip manually or automatically due to loss of input breaker control power. Local trip is required.
o RFPT 1B will not trip manually or automatically due to loss of power to its trip circuit. Local trip is required.
16
Q
What major functions and instruments are lost if the 125 VDC Cabinet “C”
(R25-S003) is de-energized?
A
- Control power is lost to the Exciter Field Breaker, however, the breaker remains closed
- Rx Instruments similar to R22-S016
- Loss of control power to 4160 ‘C’ and ‘D’ supply breakers. No transfer available manually or automatically.
- Loss of control power to 600 ‘A’, ‘B’, ‘AA’, and ‘BB’
• Unit 2
o RFPT 2B will not trip manually or automatically due to loss of power to their trip circuits. Local trip is required
• Unit 1
o 1B Recirc pump will not trip manually or automatically due to loss of input breaker control power. Local trip is required.
17
Q
What major functions and instruments are lost if the 125 VDC Cabinet “D”
(R25-S004) is de-energized?
A
- ‘A’ EDG will not auto or manual start
- ‘A’ EDG output breaker will not tie
- ARI will not initiate (S005 on U1)
- RHR ‘A’ and ‘D’ cannot be started from the MCR
- CS ‘A’ will not auto start
- Loss of control power to 4160 ‘E’
18
Q
What are the Unit 2 Undervoltage and Degraded voltage setpoints for the 4160V emergency buses? How do theses voltages cause the 86 lockout relay to trip on bus undervoltage?
A
Bus undervoltage will cause EDG to start and tie. Without a LOCA signal, there is not a signal to initiate timers for auto start of Core Spray or LPCI.
Undervoltage : 3255V
Undervoltage for >1s causes 86 lockout relay to trip
Degraded Voltage:
1) 4160V Bus 2E: 3983V
2) 4160V Bus 2F: 3924V
3) 4160V Bus 2G: 3924V
Degraded voltage for 9 seconds, causes the normal supply breaker to trip, the associated Diesel Generator to start AND alternate supply breaker to close.
If the degraded voltage condition remains for one (1) additional second, the 86 lockout relay will trip the alternate supply breaker and allow the associated Diesel Generator to tie and pick up the emergency bus loads.
19
Q
What are the Unit 1 Undervoltage and Degraded voltage setpoints for the 4160V emergency buses? How do theses voltages cause the 86 lockout relay to trip on bus undervoltage?
A
Bus undervoltage will cause EDG to start and tie. Without a LOCA signal, there is not a signal to initiate timers for auto start of Core Spray or LPCI.
Undervoltage : 3255V
Undervoltage for >1s causes 86 lockout relay to trip
Degraded Voltage:
1) 4160V Bus 1E: 4021.5V V
2) 4160V Bus 1F: 3892V
3) 4160V Bus 1G: 3916.5V
Degraded voltage for 9 seconds, causes the normal supply breaker to trip, the associated Diesel Generator to start AND alternate supply breaker to close.
If the degraded voltage condition remains for one (1) additional second, the 86 lockout relay will trip the alternate supply breaker and allow the associated Diesel Generator to tie and pick up the emergency bus loads.
20
Q
What are the pressures for the automatic start of the Fire Pumps? What is the power supply for the Electric Fire pump?
A
1X43-C001 Electric FP - Starts @ 110 psig.
1X43-C002A Diesel FP #1- Starts @ 100 psig.
1X43-C002B Diesel FP #2 - Starts @ 90 psig.
1X43-C003 Jockey Pump - Starts @ 125 psig - Stops @ 157 psig.
Power Supply: Electric Fire Pump - 4160V Bus 1E
21
Q
How does Vital AC respond on a LOSP?
A
a) Normal – Vital AC auto swaps to backup batteries. With no operator actions, voltage will reduce to <208V (~2 hours) causing Vital AC to swap to Alternate supply (600V C)
22
Q
How are the station service battery chargers restored following a LOSP?
A
a) To restore battery chargers – Manual actions must be performed including reset of non-essential load lockout and pressing push buttons in MCR (for Station Service Battery Chargers
b) 600V Bus 2C Loads Locked Out
i) 2R42-S026, 2R42-S027, 2R42-S028 Station Battery Chargers 2A, 2B, and 2C
c) 600V Bus 2D Loads Locked Out
i) 2R44-S001 Vital AC Battery Charger
ii) 2R42-S029, 2R42-S030, 2R42-S031 Station Battery Chargers 2D, 2E, and 2F
d) Recovery of Loads off 600V 2C/2D
i) RESET the 600V 2C / 600V 2D Non-Essential Load Lockout
ii) Restore Division I Station Service Battery Chargers per the following:
(1) Depress 2R42-S026, Battery Charger 2A/2B/2C pushbutton, located on 2H11-P664
(2) If previous steps did not energize Battery chargers, proceed to 34SO-R42-001-2 (locally)
iii) Restore Division II Station Service Battery Chargers per the following:
(1) Depress 2R42-S029, Battery Charger 2D/2E/2F pushbutton, located on 2H11-P664
(2) If previous steps did not energize Battery chargers, proceed to 34SO-R42-001-2 (locally)
23
Q
How does the B EDG decide which unit to align to?
A
In General, the unit that is worse off will be the one to get the B EDG.
If one unit is experiencing a LOSP, and the other unit has a LOCA, the B EDG will go to the unit with the LOSP (it needs the power)
The only times the EDG will not tie to one bus or the other is when BOTH units have a LOCA/LOSP, or when there is just a LOCA signal on a single unit (power not needed since normal power supplies available)
24
Q
What happens with Station Service Buses when there is a fault on a UAT?
A
a) UAT fault will cause a SIMULTANEOUS trip of the Main Generator and Main Turbine, both PCBs (U1 - 500/510, U2- 740/750) to open, and the Station Service buses to fast transfer to their respective SAT supply.
25
How does a Fast Transfer of the Station Service Buses take place? What conditions prevent a Fast Transfer from occurring? Does having an EDG in TEST prevent fast transfers?
b) Fast Transfer- On loss of Normal Power, the normal supply breakers auto open and alternate supply breakers auto close when BOTH generator output PCBs are opened
i) Conditions preventing a fast transfer
(1) If fast transfer does not occur w/in 0.2 seconds, auto fast transfer is locked out.
(2) “TEST NO MANUAL”: SAT Supply breakers to 4160 ‘A, B, C, D’ cannot be manually closed w/ control switch if any EDG on associated unit is in TEST mode.
(3) EDG in TEST does not prevent fast transfer.
26
What are some of the trip signals associated with the Station Service Bus Supply Breakers?
i) Overcurrent
ii) Supply Transformer fault
iii) Con Bay flooding trips NORM & ALT supply bkrs to 4160 ‘A & B’ (Circ Water pumps assumed to be source)
27
What are the loads powered from the 4160V Emergency Buses?
```
Emergency Service – 4KV
Bus E F G
CRD A B
C.S./DW Chiller(U2) A B
PSW/RHR A C/D B
RHRSW A C B/D
Fire Pump(U1) A
600 V C D
```
28
What signals cause the PSW Turbine Building Isolation Valves (1P41-F310A-D or 2P41-F316A-D) to isolate? Which can be overridden or bypassed?
LOCA (can be bypassed)
LOSP (can be bypassed)
Condenser Room Flooding (CANNOT BE BYPASSED)
29
What are the power supplies for the PSW Turbine Building Isolation Valves (1P41-F310A-D or 2P41-F316A-D)?
1P41-F310A/D 600 “C” (1R24-S025)
1P41-F310B/C 600 “D” (1R24-S027)
2P41-F316A/D 600 “C” (2R24-S025)
2P41-F316B/C 600 “D” (2R24-S027)
One isolation valve in each PSW division is powered from the opposite side. This will allow for full system isolation with only 600 C (or D) being energized.
Valves will fail AS IS on a loss of power, but will reposition as soon as power is restored.
30
For the CRD system, which directional control valves are operated for Rod Withdrawal/Insertion?
Which valves must be opened first when moving rods?
i) Odd Directional Control Valves open for Rod Insertion. (Odds - In)
(1) EP121 & EP123
ii) Even Directional Control Valves open for Rod Withdrawal. (Evens – Out)
(1) EP120 & EP122
iii) For Rod withdrawal, a brief insert signal given first causing the collet fingers to release. This means that EP 121 is the first directional control valve to open during rod withdrawal. Additionally, the settle bus is last so EP120 is last to close.
iv) EP120 or EP121 must be opened first to prevent over pressurization
31
What is the normal flow through the CRD Stabilizing Valves? What about during withdrawal/insertion?
During normal ops, stabilizing valves pass ~ 6 gpm to the cooling line and maintain constant CRD system flow
i) One set passes about 2 gpm (withdrawal) and the other set passes about 4 gpm (insertion)
ii) Stab valves de-energize to CLOSE during rod movement, forcing the flow through the directional control valves.
iii) When a rod is being moved, total system flow remains the same with one set of stab valves closing.
32
For the CRD system, how is drive water DP controlled?
i) Drive water dp is measured across C11-F003.
ii) F003 MOV- Drive Water PCV - maintains drive water pressure ~ 260 psig > Rx pressure to allow for rod movement. (P/S- 2R24-SO12 / 1R25-S116 on 1R24-SO12)
iii) F003 is closed to raise drive water dp and opened to lower drive water dp.
33
What causes a rod drift alarm?
a) Rod drift alarm occurs when rod is at any reed switch other than even position unless rod drift is bypassed for that rod.
b) Drift alarm senses power to insert, withdraw, & settle buses. Alarm is bypassed when either is energized for that rod.
i) Rod drift annunciator will alarm if the even reed switch fails for the present position of a Non-moving control rod.
34
How is a rod drift test performed?
Rod drift alarm Test- Switch to “TEST” while a rod is being moved w/ normal CRD hydraulic operations. In TEST, bypasses the Rod Not Driving portion of the Drift Alarm Circuit. Logic will see a rod changing position with no drive bus energized and give drift alarm.
35
What burnable poison is being used in our fuel? Why are the characteristics of the burnable poison added?
a) Burnable poisons (supplementary reactivity control)
i) Must deplete completely in one operating cycle
ii) Positive reactivity addition from poison burnup should match the negative reactivity of fuel burnup
(1) More power from fuel early in cycle so poisons help to control; late in cycle fuel is weaker but there are no poisons so power output is about the same
iii) GADOLINIUM is normally chosen since it meets the above characteristics
36
What is the setpoint for LPAP/LPSP on the RWM? What is the significance of being below the LPSP?
LPSP: < 21% (20.6%)
LPAP: > 26% (25.6%)
In-between the LPSP and LPAP is the transition zone, where alarms and indications, but no rod blocks.
Below LPSP: Enforces adherence to Control Rod pull sequence, by initiating withdraw and insert blocks (rod blocks)
37
For the RBM, what is the nulling sequence and when does it take place?
Nulling Sequence – RBM circuity undergoes a nulling and filtering sequence when a ROD IS SELECTED. RBM nulls for 5 secs (reads zero) then comes on scale reading 100% (0r >100 if local LPRM signal is >100.)
38
How does the RBM use the APRMs and LPRMs to determine the setpoints?
The RBM uses the APRM indication to select which of the three upscale setpoints to use. The RBM uses individual LPRM indication to determine actual local power (the % local indicated on the RBM)
```
STP RBM Setpoint
>82% 105.5%
62-82% 109.3%
>27-62% 115.1%
RBM Downscale 95%
```
39
What is the purpose of the Steam Separators?
i) Increase steam quality from 10-13% at core exit to at least 90%
ii) Turning vanes at cyclone separator inlet impart rotation to steam/water mixture causing liquid to be thrown to outside where it drains back to downcomer region
iii) Steam separators consist of 163 stand pipes 6’ tall and the pressure drop is ~7psid across separators.
40
What is the purpose of the Steam Dryers?
i) Steam dryer assembly dries steam/fluid mixture exiting separator to at least 99.9% steam quality & provide a seal b/n separators & turbine
ii) Wet steam from separators forced horizontally thru chevron dryer panels, steam makes series of rapid changes in direction
iii) Moisture is thrown to outside where it is caught by moisture collection hooks where it drops down into collecting troughs and routed to outside of dryer assembly by drain pipes
41
What effect does the loss of a single division of RPS A(B) have on the plant in regards to containment, MCREC,
and SBGT? What is the unit difference?
a) PCIVs
i) Some Group 1 Valves
(1) RPS A – Inboard MSL Drain and RX Sample Valve Close
(2) RPS B – Outboard MSL Drain and RX Sample Valve Close
ii) ½ Group 2
(1) RPS A – Inboard Group 2 Isolation
(2) RPS B – Outboard Group 2 Isolation
(3) TIP withdrawal and ball valve isolation
b) Main Control Room swaps to pressurization mode
c) SCIV and SBGT (Unit 1 Only)
i) ON loss of U1 RPS A or B, a full secondary containment isolation (both units RX Building and RF) occurs and all four SBGT trains start
42
What is the preferred alternate power source for RPS? How is it aligned?
RPS Alternate power is aligned via a throw over switch aligned to Essential Cabinet A or B. (BREAK BEFORE MAKE SWITCH)
The preferred alternate power is from the Essential Cabinet powered by the same division (ESS A for RPS A and ESS B for RPS B)
43
What are the major IRM setpoints? When are they bypassed?
a) IRM Downscale (10/125) is bypassed on Range 1
b) IRM Rod Block at 80/125 (25.6/40)
c) SCRAM at 115/125
d) All IRM SCRAMs and Rod Blocks are bypassed in RUN
e) All respective IRM SCRAMs and Rod Blocks are bypassed when that particular IRM is in Bypass
f) INOP - SOO MU HVL- Switch out of operate, Module unplugged, High volts low
44
How many IRMs can be bypassed? How many IRMs are required?
i) 2 IRM bypass switches- only bypass 1 IRM per trip system (ACEG, BDFH)
ii) Required IRMs:
(1) Mode 2 & 5 - Must have 2 per RPS trip sys
(a) ** Must have 1 channel in each quadrant of core for RPS
(2) Mode 3 & 4 – None
One channel in each quadrant of the core must be OPERABLE whenever the IRMs are required to be OPERABLE. Both the
RWM and a second licensed operator must verify compliance with the withdrawal sequence when less than three channels in
any trip system are OPERABLE
Mode 5: With any control rod withdrawn from a core cell containing one or more fuel assemblies.
45
What are the SRM rod block setpoints, and SCRAM setpoint? When are they bypassed?
a) Rod Block
i) Upscale – 7x10^4 cps; Bypassed at associated IRMs ≥ Range 8, Mode 1, or Channel Bypassed
ii) INOP – SOO MU HVL High voltage low, switch out of operate, or module unplugged. Bypassed at associated IRMs ≥ Range 8, in RUN, or Channel Bypassed
iii) <200 cps and not fully inserted - bypassed at associated IRMs ≥ Range 3
iv) <5 cps - bypassed at associated IRMs ≥ Range 3
b) SCRAM
i) Any single SRM reading ≥3x10^5 cps with shorting links removed (Upscale Trip). Also, bypassed when in Mode 1.
46
What are the consequences of having shorting links installed or removed?
a) Normally always installed.
b) With shorting links removed any single RPS SCRAM setpoint will result in a full SCRAM.
c) When installed, the shorting links bypass SRM and IRM single coincidence SCRAMs. When not in Mode 1 and without shorting links, any one SRM or IRM reaching SCRAM setpoints would cause a full SCRAM.
d) SRM – 3x10^5 cps, IRM – 115/125 or INOP
47
What are the APRM trip setpoints?
APRM Neutron Flux High - 117% In Run (13% NOT in Run)
APRM STP High .57(W) + 53 - .57∆W (clamped @ 112.5%) In Run
APRM INOP Sw out of Operate, Critical Self-Test Fault, High Volt Low
48
What are the APRM rod block setpoints?
APRM STP High .63w + 41 - .63∆W (clamped @ 110.0%) In Run
APRM STP Upscale 10.0% NOT in Run
APRM Neutron Flux Downscale 5.0% In Run
APRM INOP Sw out of Operate, Critical Self-Test Fault, High Volt Low
APRM Too few inputs < 17 LPRM total or < 3 per level
49
What is the power supply to the 2/4 voter modules? What APRM/OPRM signals are required for the voter modules to generate a SCRAM signal?
Power supply:
A/C voters - RPS A
B/D voters - RPS B
a) Each APRM communicates with each 2/4 voter module. Loss of power to voter module will cause a half scram in its division of RPS. If an APRM has a high or INOP trip, it sends a trip signal to each voter. Two out of four votes will causes each voter module to issue a SCRAM signal to its division of RPS. If one APRM is bypassed, the logic becomes 2 out of 3 for a SCRAM.
b) APRMs and OPRMs send votes to the 2/4 voter modules. It takes two APRM votes or two OPRM votes to SCRAM. (Not 1 OPRM and 1 APRM)
50
Which APRMs are associated with RBM A and RBM B?
RBM A:
Primary APRM - A
Secondary APRM - C
Backup APRM - D
RBM B:
Primary APRM - B
Secondary APRM - D
Backup APRM - C
51
How does the CRD flow control valve (C11-F002) respond to a loss of air? SCRAM (not due to a LOCA)? LOCA signal? What is the minimum flow through the valve?
a) Fails closed on loss of air (NIEIA)
b) Controller/Flow Element is upstream of the tap for SCRAM accumulator recharge/filling.
i) FCV goes full closed after a SCRAM without a LOCA due to flow being diverted to recharge the SCRAM accumulators through C11-F034. Orifices are installed (5 U2, 4 U1) to prevent pump runout following a SCRAM. A major concern after a SCRAM with CRD pump flow high is excessive bottom head cooldown.
c) FCV goes full open after a LOCA signal due to no pump flow **(CRD pumps trip on LOCA) **
d) FCV has a mechanical block (U2) installed (orifice in valve seat on U1) to allow minimum of 5 gpm flow when valve is full closed.
52
For the Control Rod Drive Mechanism, what is the purpose of the index tube?
i) Index Tube – Connected to the control rod
(1) Drive piston on bottom of index tube produces a dp causing index tube/control rod movement
(2) Notches are machined in the face of the index tube and engage a set of collet fingers allowing the tube to not be in a mid-position
53
For the Control Rod Drive Mechanism, what is the purpose of the collet assembly? How many collet fingers/rod?
Provides the means by which the index tube is locked into a specific notch position.
i) There are 6 collet fingers/rod
54
For the Control Rod Drive Mechanism, what is the flowpath for the cooling water when a rod is not fully withdrawn? What is different if the rod IS fully withdrawn?
The flowpath is:
i) Cooling water enters insert line from the CRD cooling water header.
ii) Flows in the under-piston-port and thru an orifice to the area b/w thermal sleeve & outer tube.
iii) Flows entire length of mechanism & exhausts thru outer filter into area b/w index tube & CRD Guide Tube/Housing coupling.
iv) With CR in any position except fully withdrawn, flow continues up CRD guide tube, around the velocity limiter, and into the Rx vessel above the core plate.
Cooling Water flow with CR fully withdrawn
i) Seating surface on velocity limiter mates with seating surface on CRD guide tube & blocks the normal flow path.
ii) In this position the uncoupling rod is engaged by the top of the stop piston and raises the male lock plug ~ 1/8".
iii) This, in turn, raises the valve disc under the uncoupling handle above the velocity limiter and aligns a flowpath for water from the cooling water annulus thru the spud fingers & up the center of the velocity limiter.
55
What is the only allowed alternate reed switch position for the RWM?
Alternate
i) For RWM, position 46 is the only alternate reed switch position. It is accepted for 48 (full out) position.
ii) With RWM step withdraw limit position “48”, RWM logic allows rod to be at position “46” & not enforce any rod blocks / errors when latching into next step – treats it the same as “48”. This is the ONLY rod position that has an alternate withdraw limit position.
56
What is a substitute reed switch position on the RWM?
i) Used in the event of a failed reed switch.
ii) Rod positions can only be substituted at the Operator’s Display.
iii) A faulty reed switch is indicated by the letter “FF” for rod position.
iv) 34GO-OPS-065-0, Control Rod Movement, is used to substitute a control position.
(1) WHEN moving control rods and a failed reed switch is encountered that requires substitution, the Rod Mover must substitute the position.
(2) The RWM will NOT allow a substitute position to be entered IF there is a functional reed switch for that rod’s position OR IF there are already eight control rods with substitute positions.
(3) The rod will automatically be removed from the substitute rod list IF it is moved to a position with an operating reed switch OR IF its reed switch is returned to service.
57
How does the DHR system prevent leakage to the environment?
Secondary Loop Pressure Control Valve (1G71-F013) is used to establish and maintain the proper dp across the DHR heat exchangers. The control valve is located on the 203' elevation in the secondary loop. The valve is set up to maintain secondary loop pressure between 40 - 65 psig and > 15 psid above the primary loop pressure.
The primary loop pressure is maintained lower than the secondary loop pressure. A DIFFERENTIAL PRESSURE (dp) SWITCH will trip the primary pumps at 10 psid decreasing if the pump switch is in AUTO.
58
What is the RCS Pressure Safety Limit? Design Pressure? What must be done if the safety limit is exceeded?
a) Safety Pressure Limit ≤ 1325 psig (read in steam dome) – applies at all times
i) Design Pressure Limit is 1250 psig.
(1) Exceeding the design limit by 10% (125psig) is allowed during a transient. This is in accordance with ASME Boiler & Pressure vessel code
(2) This equates to a pressure transient limit of ≤ 1375 psig (at lowest elevation of RPV). 1250# + 125# = 1375 psig.
ii) Safety Limit is ≤ 1325 psig since pressure is measured in steam dome (not lowest elevation of RPV) which adds 50 psig due to water column in RPV
iii) If exceeded – Must restore and insert all insertable control rods within 2 hours.
59
What is the max allowable Tech Spec RCS Heatup/Cooldown rate? What is the procedural limitation? What actions are required by Tech Specs if this rate is violated?
a) Heatup/cooldown rate is limited to 100F/hour
b) Tech Spec to restore within 30 minutes, and perform an evaluation to determine if it is acceptable for operation within 72 hours
c) Procedure requires:
i) Heatup ≤ 25F every 15 minutes
ii) Cooldown ≤ 50F every 30 minutes
iii) Note : If either procedure limit is exceeded, then heatup/cooldown may proceed but action must be taken to not exceed the tech spec limit.
60
What is the purpose of the DHR system?
a) Used during outages and high heat load conditions to remove decay heat from U1 or U2 spent fuel pools.
b) Allows RHR &/or FPC&CU to be removed from service during outages.
2 Primary Loop Pumps – 100% capacity each, no auto starts
i) Running pump trips on low dp secondary to primary loop (10 psid and lowering)
(1) Will not trip if pump control switch is in HAND
61
How does the DHR system prevent leakage to the environment?
Secondary Loop Pressure Control Valve (1G71-F013) is used to establish and maintain the proper dp across the DHR heat exchangers. The control valve is located on the 203' elevation in the secondary loop. The valve is set up to maintain secondary loop pressure between 40 - 65 psig and > 15 psid above the primary loop pressure.
The primary loop pressure is maintained lower than the secondary loop pressure. A DIFFERENTIAL PRESSURE (dp) SWITCH will trip the primary pumps at 10 psid decreasing if the pump switch is in AUTO.
62
What are the ATWS trip setpoints for the Recirc Pumps? What is the basis for these setpoints?
1170 psig
or
-60” RWL
1170 psig assumes that MSIVs close, but Rx fails to SCRAM
-60" ensures no cavitation of the recirc pump and helps to maintain RWL above TAF
63
What are the trip setpoints for the Recirc pump discharge valves? How do they operate on pump start?
< 90% Open
Closes on:
LOCA signal present
AND
Rx Press <370 psig
Valves jog open on pump start.
• Trip is bypassed for start
• must be off closed seat w/in 3 sec
• must be > 90% open w/in 96 sec of start
64
How does core orificing promote more stable core flow? How many zones of orificing are there?
Orifices installed to control flow to each fuel assembly. Without orifices, central fuel bundles would be starved of coolant due to two-phase flow resistance. As power is increased, amount of boiling (two-phase flow) increases along length of fuel bundle
Power from peripheral bundle = ½ of center bundle; boiling is greatest in center
Two-phase flow restricts cooling water flow due to boiling action
Majority of pressure drop is across orifice, causing any change in two-phase flow within individual fuel assemblies to be insignificant thus promoting stability thru core
Core divided into 2 orifice zones - CENTER zone (2.43” Ø), four lobed PERIPHERAL zone (1.488” Ø) & single peripheral zone (1.25” Ø)
65
What is the power supply for the Refueling platforms?
| How does the grapple and hoist respond to a loss of air?
R24-SO15 off 600 AA
The grapple and hoist fail closed on loss of air.
Additionally, if power is available, hoist and grapple can still be moved up/down with loss of air but can’t be opened/closed.
66
What are the power supplies for the Condensate/Booster Pumps?
What is the restraint when starting a CP or CBP with a LOCA?
'A/B' CP & CBP - 4160 D
'C' CP & CBP - 4160 C
50 second TD on auto start of standby pump during LOCA to prevent overloading startup transformers when ECCS pumps are starting
67
What is the power supply for the SBLC pumps and squib valves? What is the power supply for the continuity lights?
A pump and squib: R24-S011 (600C)
B pump and squib: R24-S012 (600D)
Continuity lights: 2R25-S101 (S125) - Off S011
68
What are the power supplies for the Station Service Air Compressors?
SSAC “A” - 600 “C” (R23-S003)
SSAC “B” - 600 “D” (R23-S004)
SSAC “C” - U2: 600 “A” (2R23-S001)
U1: 600 “BB” (1R23-S012)
69
What is the effect of losing 4160 V 'C' on U2/U1?
U1 - Immediate SCRAM on low RWL due to loss of both RFPT oil pumps = both RFPTs trip
U2 - Runback to SL #2 due to loss of one oil pump and associated RFPT trip. Eventual loss of ASD cooling (600 AA/BB) leads to recirc pump trip and SCRAM
70
At what levels does the RBCCW surge tank start and stop filling? How does the timer work for the surge tank?
Starts @ 50.5"
Stops @ 62.5"
Filled with DEMIN water
Timer portion normally reset to 13 hours and the counter is normally reset to 0002
(1) When the surge tank level decreases to the demin makeup valve opening setpoint
(a) The counter decreases to 0001
(b) 13 hour timer starts timing BACKWARDS toward zero
(2) If the surge tank level again decreases to the demin makeup valve opening during that 13 hour period
(a) Counter decreases to 0000
(b) Timer stops timing
(c) Annunciator sounds in the MCR
(3) Timer/counter must be locally reset before it will resume auto operation
(4) If after one fill cycle, the 13 hour timer times out, the system auto resets to 13 hours and a counter of 0002
71
Which Station Service Air Compressor is not locked out following a LOSP? How are Station Service Air Compressors reset following a LOSP?
Non-Essential Load Lockout - Note that 1A SSAC is locked out following a LOSP.
**2A SSAC is NOT.**
To restart following a LOSP – Once power restored, Reset Non-essential load lockout, Close the SSAC breaker locally and restart from the MCR.
72
What are the Circ Water pump/valve interlocks?
Circulating Water Pump TRIPS if its discharge valve <90% open (after 90 sec time delay)
ONLY interlock for the Circ Water pump is the pump cannot be started until a 90 second time TDR has timed out following a pump trip
Discharge valve does not have to be fully shut in order to start the pump, just the 90-sec TDR timed out
Circulating Water Pump Discharge Valve Interlocks
- When the valve control mode selector switch is in automatic, the discharge valve will automatically open when the pump is started and automatically close if the pump trips
- If the discharge valve for a tripped CWP does not auto close, then some flow from the operating pump will bypass the condenser through the tripped pump
- This will cause vacuum to worsen much faster than expected
73
Which air systems supply the MSIVs?
Inboard MSIVs – Nitrogen Makeup via Drywell Pneumatics
Outboard MSIVs – Non-Interruptible Essential Instrument Air (NIEIA) - with backup N2
MSIVs will drift shut due to spring pressure on a loss of their respective pneumatic supplies.
74
Does a Speed Hold on a Recirc pump prevent runbacks/speed limiters?
NO
Recirc runbacks/Speed Limiters WILL work with Speed Hold active. Must reset (on H11-P602) prior to changing speed manually.
75
How many power cells are allowed to be bypassed on the ASD? What happens to Recirc pump speed when a cell is bypassed?
Power Cell Bypass
i) Up to 3 of 12 power cells may be bypassed and ASD will continue to operate
(1) any 9 cells sufficient
ii) Cells will auto bypass
iii) Action Sequence on Cell Bypass
(1) ASD trips (input breaker remains closed)
(2) Cell auto bypassed
(3) Pump speed determined by ASD controller
(4) ASD starts & “catches” pump where it is
(5) Operator must depress Speed Hold Reset to restore Recirc pump speed
BIG PICTURE: Recirc pump will slow down slightly as the cell is bypassed. WILL NOT automatically go back to previous speed.
76
What effect does losing Vital AC have on the FW system?
Loss of Vital AC (R25S063)
i) Master Controller and “B” M/A Station lose power
ii) “A” M/A Station senses a loss of signal from Master Controller & assumes auto control (internal setpoint of 37”) in single element using the selected GEMAC. (PF light flashing)
iii) “B” RFPT swaps to speed setter mode
iv) All recirc runbacks (#1,2,3,4) are disabled
v) On U1- CBP & RFPT “A” min flow valves fail open diverting Condensate & FW to the Main Condenser
77
What is the general flowpath through the HXs in the RWCU system?
RPV to RWCU Pump to Regenerative HXs (3 in series) to Non-Regenerative HXs (2 in series) to RWCU Demins to Regenerative HXs to Feedwater line to RPV
Outlet of the 2nd NRHX, just prior to the RWCU Demins, is where the 140 F temperature element is located to isolate the F004 valve.
78
What is the cooling medium for the NRHXs in the RWCU system?
RBCCW cools the NRHX
79
Which reference legs feed which GEMACs for RWL?
c) D004A & B - Narrow Range (0” to 60”)
i) Narrow Range uses tap N11 A/B for variable leg pressure
ii) In addition to feeding the 623 fuel zone level indicators
(1) On Unit 2,
(a) D004A feeds R606B
(b) D004B feeds R606A and R606C
(2) On Unit 1,
(a) D004B feeds R606B
(b) D004A feeds R606A and R606C
80
What effect does a failure of the Master Controller have on the FW system? What about loss of signal from the Master?
Failure of Master Controller
i) If “A” M/A Station is in auto, it will maintain RWL in single element using an internal setpoint of 37” (stays in auto)
(1) “B” M/A Station will default to Manual Control
ii) If “A” M/A Station is in manual (or not in service), “B” M/A Station will assume auto control in single element utilizing an internal setpoint of 37”
Loss of Signal from Master Controller
i) If Master controller is in Auto & a signal is present, just downscale (-2.0%), RFP A & B Bias M/A Station Controllers will follow the Master Controller and decrease output to 2100 rpm. They will remain in Auto Mode. (SCRAM on low level is possible)
ii) Complete loss of signal - Caused by loss of power resulting in a loss of signal to the TMR Mark V cabinet
(1) TMR auto swaps to the SS Mode
(2) RFPT speed will be the speed sensed 1 second prior to the failure
81
Regarding SPDS messages, what does HOT LEGS MAY BOIL and MAY MISS TRIP mean?
Hot Legs May Boil - Appears on Primary display when reactor vessel level instrument hot legs are within 10°F of reactor saturation temperature. Drywell temperature instruments located near the water level reference legs determine hot leg temperature. Message appears to the left of the RPV figure.
i) Warns of a condition conducive to instrument leg flashing.
May Miss Trip - Appears on the Primary Display when actual reactor water level (compensated) has dropped below the lower tap before the indicated (uncompensated) level has reached LEVEL 1 (-113", Tech Spec value) trip elevation. Message appears to the right of the RPV figure.
i) Warns that instrument may not be accurately tracking level.
82
What happens to indicated level with a reference leg leak? What about for a variable leg leak?
For large rupture of a reference leg:
i) Pressure in the reference leg will lower rapidly
ii) All pressure detectors on the reference leg will read lower.
iii) This will cause the indicated level to RISE. Reference – Variable = dp
For large rupture of a variable leg:
i) The low pressure leg will depressurize.
ii) The dp will increase causing the indicated level to LOWER.
Reference leak = RISE
Variable leak = LOWER
83
If a SBLC pump is LOCALLY started, do the squib valves still fire? What about a Group 5 Isolation?
Local panel (203' RB) has a separate switch for each pump. The pumps can be started/stopped for testing WITHOUT operating the squib valves. Local control also used for Manual Initiation when required by EOPs or RS procedures.
Local Operation WILL NOT cause Group 5 Isolation (G31-F004, Outboard RWCU Suction Valve)
84
If 2P51-F565 (or 1P51-F874, F875, F876, F877, F878) was closed, AND there was a loss of all air compressors, what would be the effect on MSIVs? SCRAM air header? C11-F002? SBGT? Startup level control valve (N21-F111)?
MSIVs – Outboard valves drift closed, inboards remain unaffected due to Drywell Pneumatic Supply
SCRAM air header to possibly depressurize causing EP126/EP127 to open and insert rods
C11-F002 (CRD Flow Control Valve) fails closed; CRD flow at 5 gpm
SBGT valves fail open on loss of air
Start-up Level Control Valve (N21-F111) fails AS IS (Locks up at existing position) at 50 psig
85
What are the RHR F008/F009/F015 interlocks?
F008/F009: SDC suction
Auto close with Rx Press > 138 psig or RWL < +3”
F015: Inboard injection valve
• Auto opens and interlocked open on LOCA signal w/ Rx press < 425 # (449 #)
• Cannot manually open w/ Rx press > 425 # (449 #) unless respective F017A/B is closed
o Can be manually opened if < 425 # (449 #) regardless of respective F017A/B position
• Auto closes if in SDC and receive a Group II signal (+3” or 1.85)
o Auto reopens if subsequent LOCA signal received, provided F008 or F009 full closed or Rx press > 138#
• WILL NOT auto open on a LOCA signal if in “Test Status”.
86
What are the RHR F048/F017 interlocks?
F048: RHRHX bypass
Auto opens and is interlocked open for 3 min on a LOCA signal
F017: Outboard injection valve
• Auto opens & interlocked open for 5 min (11 min) on receipt of LOCA signal and Rx press < 425 # (449 #)
• Cannot manually open w/ Rx press > 425 # (449 #) unless respective F015A/B is closed
o Can be manually opened if < 425 # (449 #) regardless of respective F015A/B position
BYPASSED at RSDP
87
When does the Standby RBCCW pump auto start? What are the power supplies for the RBCCW pumps?
Standby pump: Low header pressure <90 psig
C-D-C for power
RBCCW pumps A & C: 600V C (R23-S003)
RBCCW pump B: 600V D (R23-S004)
88
What is the relationship between PSW and RBCCW pressure? How is this maintained?
PSW is maintained >7 psid higher than RBCCW. Want PSW to leak into RBCCW if there is a HX tube leak
Maintained by # of PSW pumps, throttling HW discharge, or by isolating the HX
89
What are the standby pump start, pump trip, and Speed Limiter #3 setpoints for the CBPs and RFPTs?
CBP Suction Pressure RFPT Suction Pressure
40 (25) - 10s T.D. SL #3 225 (165) - 5s T.D.
38 (28) - 10s T.D. *Stby pump 207 (145) - 5s T.D.
34 (15) psig Pump Trip 207 (145) psig
(A:40s, B:70s, C:100s) (A:15s, B:25s)
*Standby refers to the pump providing the suction pressure, i.e. CBP will start for low RFPT suction pressure
90
What are the power supplies to the GEMAC RWL instruments?
LI-R606A - Vital AC
LI-R606B - R25-S001 (125VDC A)
LI-R606C - R25-S002 (125VDC B)
91
What are the HPCI trips and system response to a trip?
```
SAMEOL
Suction Pressure Low 10” Hg Vac
Any Isolation
Manual
Exhaust Pressure High 140 psig
Overspeed 5000 rpm
Level High 51.7” (51.5”)
```
HPCI response to a turbine trip
(1) TSV closes, F006 (Discharge Valve to RPV) & F012 (Min Flow Valve) close when TSV is fully closed, AOP starts at 39 psig
(2) All HPCI Turbine trips w/ exception of High RWL will auto reset when the trip is below the trip point
(a) Isolation signal must be reset prior to the trip clearing
(b) HPCI Turbine High Level Trip Response - When level ↓ below the high level trip setpoint HPCI may be restarted by depressing the High Level Reset pushbutton. If high level trip is not reset & level ↓ to the Low Level initiation setpoint HPCI will auto start
92
What are the HPCI isolation signals and system response to an auto/manual isolation?
SELF
Steam Line Pressure Low 134 psig (128 psig)
Exhaust Diaphragm High Pressure 10 psig
(Between the exhaust diaphragms)
Leak Detection HPCI Temp High: 165F, HPCI Pipe Pen Room High: 165F, Torus Area Amb Temp: 165F w/14 min td (13.5 min), Torus Area Diff Temp: 36F w/ 14 min td (15 min)
Flow Hi (303%) +202” H2O ↑ or -100” H2O ↓ (+218” or -100”)
HPCI response to an AUTO-isolation signal - F002 & F003 and F042 & F041 close. HPCI Turbine Trips
HPCI response to a MANUAL isolation → only works if white light is ON & only effects 'B' Isolation logic
OUTBOARD valves F003 & F041 close. HPCI Turbine trips
93
What are the RCIC trips and system response to a trip?
```
SAMEO
Suction Pressure Low 10” Hg Vac
Any Isolation
Manual
Exhaust Pressure High 40 psig
Overspeed (125%) 5625 rpm
```
RCIC response to a Turbine Trip: TTV closes → F013 (Discharge Valve to the RPV) & F019 (Min Flow Valve) close when TTV is full closed
94
What are the RCIC isolation signals and system response to an auto/manual isolation? How does RCIC respond to a High RWL shutdown?
SELF
Steam Line Pressure Low 95 psig
Exhaust Diaphragm High Pressure 10 psig
Leak Detection: RCIC Temp High: 165F, Torus Area Amb Temp: 165F w/29 min td (28.5 min), Torus Area Diff Temp: 36F w/ 29 min td (28.5 min)
Flow Hi 307% (306%)TS 143” H2O or -100” H2O
(A/B 199/173” H2O or -100” H2O)
RCIC response to an auto-isolation
(1) F007 & F008 close
(2) Turbine Trip Signal will trip closed the TTV
(3) F013 & F019 close due to the TTV closing
RCIC response to a manual-isolation – pushbutton tied to 'A' logic & Only function when RCIC initiation signal is present
(1) OUTBOARD valve F008 closes
RCIC response to a HIGH RWL SHUTDOWN signal – 2 water level instruments in series must see high RWL to close F045
(1) F045 & F046 close
(2) F013 & F019 close when F045 is full closed
(3) System will auto initiate if RWL ↓ to -35”
95
What are the trip signals associated with the CBPs?
LESS
Low oil press: 5 psig (U2 only)
Electrical Fault
Suction valve not full open
Suction Press low: 34 (15) psig (A: 40s, B: 70s, C: 100s)
96
What are the trip signals associated with the RFPTs?
STROLL
Suction press low: 207 (145) A:15s, B:25s
Thrust bearing wear: +/- 32mils
RWL High: 54" (54.5")
Overpseed: 5900 RPM
Low condenser vac: 22.3"Hg (17" Hg) when >3500 RPM
Low bearing oil press: <4 psig RFPT or RFP <100 psig for emergency trip oil header
97
What are the Core Spray F004/F005 interlocks?
```
F004: Outboard injection valve
Cannot open with control switch unless F005A/B is full closed
Auto opens and interlocked open if
o Power available to pump
o Auto initiation signal received
o Reactor pressure < 425 (449) psig
```
F005: Inboard injection valve
Cannot open with control switch unless F004A/B is full closed or Rx Press is < 425 (449) psig
Automatically opens if
o Power available to pump motor and
o Auto initiation signal received
o Reactor pressure < 425 (449) psig
Can be closed with control switch with auto-initiate signal present – allows throttling of CS (no time delay)
98
What are the Core Spray F031/F015 interlocks?
F031: Min Flow Valve
• Auto-opens on a decreasing flow of <700 gpm
• Auto-closes on an increasing flow of >950 gpm
• Restricting orifice passes a maximum of 475 gpm
F015: Test Line Valve
• Interlocked closed on a system auto initiation
99
What are the requirements for Speed Limiter #1?
```
#1 (22%) (370rpm)
•Recirc disch vlv <90% open
OR
•Total FW flow <20% 15s TD
OR
•Total Steam Flow decreases by 60% of previous 6 min value
AND
•RWL <20” on Master FW Controller
```
All runbacks give alarm on P602 - "Recric Speed Limiter"
100
What are the requirements for Speed Limiter #2?
```
#2 (33%) (554rpm)
RESET PB on P602
•Either RFP flow <20%
AND
•Either RFP has TMR trip
AND
•RWL (L4) <32”
OR
•Steam Flow >65%
```
**Illuminates the RED runback light on the H11-P602, only speed limiter to cause this light**
All runbacks give alarm on P602 - "Recric Speed Limiter"
101
What are the requirements for Speed Limiter #3?
#3 (61%) (1025rpm)
RESET PB on P602
•CBP suction press <40 psig (25) w/ 10s TD
OR
•RFP suction press <225 psig (165) w/ 5s TD
All runbacks give alarm on P602 - "Recric Speed Limiter"
102
What are the requirements for Speed Limiter #4?
```
#4 (Variable 100% to 33%)
•6.7% speed/1” decrease in RWL (from 30” to 20”)
```
All runbacks give alarm on P602 - "Recric Speed Limiter"
103
What are the RCIC suction valve interlocks? CST/Torus swap levels?
E51F010, RCIC CST Suction Valve: Opens on initiation signal unless both F029 and F031 are full open
Closes if both F029 and F031 are full open
E51F029, RCIC Outboard Torus Suction Valve: Opens when CST level <13 5/8” & 14 1/8” or SP level >150.5” (CST <15” or SP >150.5”)
E51F031, RCIC Inboard Torus Suction Valve: Opens when CST level <13 5/8” & 14 1/8” or SP level >150.5” (CST <15” or SP >150.5”)
E51-F022 closes when E51-F031 OR E51-F029 are open.
104
What do the Inhibit Switches do in the ADS system?
Inhibit Switches – “ADS Inhibit Switch(es) in Inhibit Position”
i) Prevent ADS actuation when BOTH placed to INHIBIT by opening contacts in the ADS circuit
ii) If white light above each switch is not illuminated, ADS may not be inhibited
iii) If placed to inhibit w/ ADS valves open from an auto initiation signal, the valves will close
iv) If all initiation signals are present & the Inhibit switches are placed in Normal from Inhibit, all ADS valves will immediately open b/c the 102.5 sec timers and 11 min timers are NOT reset when Inhibit switch is placed in INHIBIT.
105
How are the transfer canal seals supplied with air?
Transfer canal seals have REDUNDANT AIR SUPPLIES.
* The OUTER seals are supplied by U2 service air
* The INNER seals are supplied by U1 service air
There are backup Nitrogen bottles on the refuel floor, valved in by I&C.
Loss of one will have no effect on SFP level.
106
What is the minimum Reactor Vessel water level and Fuel Pool water level during a refueling outage?
RPV water level shall be ≥ 23 ft above the top of the irradiated fuel
assemblies seated within the RPV.
Fuel Pool Water level shall be maintained > 21’ above the top of the fuel assemblies in the fuel pool
107
What do the SRV light indication do on actuation of ADS, LLS, manual?
How is Main Steam flow effected by a lifting SRV?
Lights
i) Green Light - Power is available for solenoid control valve
(1) Lit unless- Control Switch in “OPEN” or ADS has opened the SRV
ii) Amber Light - Indicates pressure w/in tailpipe of any SRV has reached ≥ 85#
(1) Light manually reset by keylock switch
iii) Red Light - Solenoid energized due to ADS or LLS or Electrical Overpressure or Control Switch in “OPEN”
iv) ADS Actuation - Amber & Red lights ON when valve is open
v) Control Switch - Amber & Red lights ON when valve is open
(1) Green light ON when valve is closed (once tailpipe press is reset)
vi) Electrical Overpressure and LLS - Green, Amber, & Red lights ON when valve is open
Steam Flow Indication goes down when SRV Opens
108
What are the Auto Start signals for the SEC Coolers?
During normal ops on both units
1 SEC cooler is running in CRD diagonal (cools running CRD pump), in RCIC room & in HPCI room
All other SEC coolers are secured
Auto start initiates “SEC Auto Initiation Signal Present” P650 / P657
o CRD diagonal: In AUTO both auto start on High CRD room temp: A (95°F) & B (100°F)
o RCIC diagonal: In AUTO both auto start on
RCIC initiation (E51F045 open) or High RCIC diagonal temp: A 100°F (100F) & B 100F (105°F)
o HPCI room: In AUTO both auto start on
HPCI initiation (E41F001 open) or High HPCI room temp: A 100°F (100F) & B 100F (105°F)
o SE CS/RHR diagonal: In AUTO both auto start on
CS ‘B’ (A) running or RHR ‘B or D’ (‘A or C’) running or High SE diagonal temp: A (135°F) & B (140°F)
o NE CS/RHR diagonal: In AUTO both auto start on
CS ‘A’ (B) running or RHR ‘A or C’ (‘B or D’) running or High NE diagonal temp: A (135°F) & B (140°F)
109
Which RHR interlocks are affected with operation from the RSDP?
Interlocks affected with RHR Operation from RSDP
i) F004B & F024B must be closed to open F006B
(1) Once F006B is open, F024B may be reopened
ii) F006B and F004B may not be open at the same time
iii) F007B operates automatically from the old transmitter when operated from RSDP – functions normally
iv) 'B' pump only trips on Overcurrent & LOSP Load Shed (Not Loss of Suction)
v) All other RHR system valve interlocks (for valves operated from RSDP) are bypassed w/ control @ RSDP
110
How does RHR respond on an auto initiation of LPCI while in SDC? What about at RSDP?
Automatic Initiation of LPCI (While in SDC)
i) No AUTO SWAPS
ii) A leak develops resulting in a decrease in reactor water level. Assume no operator action.
iii) As RWL decreases to +3"
(1) SDC Suction Isolations Valves F008 and F009 will close.
(2) RHR Inboard Injection Valve F015B will close.
(3) RHR pump will trip due to F008/F009 closure (No suction source).
iv) When RWL reaches -101”, F015B will open, however, RHR pumps will NOT start due to a suction lineup trip. Manual re-alignment of suction is required.
v) RHR Hx Bypass Valve F048B will open at -101”
vi) No suction path exists for the pumps unless the operator manually closes the F006 valves and opens the F004 valves.
Automatic Initiation of LPCI (While in SDC with Op from RSDP)
i) As RWL decreases to +3"
(1) SDC Suction Isolations Valves F008 and F009 will close.
(2) RHR B pump will not trip due to F008/F009 closure (No suction source).
ii) No suction path exists for the B pump unless the operator manually closes the F006B valves and opens the F004B valves.
iii) RHR A and C pumps start and inject
iv) RHR D starts and injects
v) RHR B will be running with no suction source.
111
How does HPCI respond to a suction source swap?
a) E41-F042 and E41-F041 – Isolates the torus from HPCI and provides auto transfer of HPCI pump suction source from CST to Torus when:
i) CST level <34” (39”) or Suppression pool level >152”
ii) Suppression pool is the suction source required by TS
b) E41-F004 will close when both E41-F042 AND E41-F041 are open
c) E41-F008 and E41-F011 will close when E41-F042 OR E41-F041 are open
112
What type of detector is used in the Liquid Process Rad Monitors? What is the power supply for these detectors? What plant systems are monitored with these detectors?
Scintillation detectors used Liquid Process Rad monitors
24/48 VDC B
PSW (alarm only)
RBCCW (alarm only)
Liquid Radwaste (isolation and alarm functions)
113
What signals will cause the Liquid Radwaste discharge to isolate?
Hi (from discharge permit)
INOP
Downscale (3cps)
Low dilution flow of <10,000 gpm will also cause an isolation (not a rad monitor setpoint
114
How does Core Spray leak detection work?
a) Negative pressure is good. Normally at 100% = -3.5psid
| b) Alarm in MCR at -0.55 psid
115
Which SRVs are operable from the RSDP?
SRVs B & F (C & G)
i) While operating from RSDP, no electrical overpressure (1120 psig) & No LLS function.
ii) Mechanical Opening and Manual Opening Only from RSDP
iii) Will not function as LLS Valve when controlled from RSDP
116
Which RCIC interlocks/auto functions are still available at the RSDP?
RSDP RCIC
All auto & manual RCIC turbine trips are still operable.
RCIC isolation signal (SELF) only causes a turbine trip. TTV close, F013 close, F019 close. F007 and F008 will remain open.
No High RWL shutdown at 51.7”(51.5”) while operating from RSDP.
117
What is the basic flowpath for MCREC in the Normal mode of operation?
o Outside air is drawn thru Louver D007A and passes thru Roll Filter D003 and damper F016
o 2 rad detectors (N015A/B) b/w louver & roll filter for Pressurization Mode on elevated rad levels.
o Flow is then directed thru filter train bypass (F011, F012) to the suction of the AHUs
o During normal conditions two of the three AHUs will be running, usually B003A & B003C
o B003A is for U2
o B003C is for U1
o B003B is the standby that can supply either MCR
o Recirc flow from MCR combines w/ outside air & flows thru AHUs
o Rad detectors (N013A/B) downstream of AHUs will alarm in MCR on ↑ rad levels
o Filter train fans C012A/B are normally lined up for auto ops
o MCR exhaust fans C011A/B are normally secured
118
What is the basic flowpath for MCREC in the Pressurization mode of operation?
Only automatic mode of operation
PRESSURIZATION = Only the TEENS, F011 and F012 close
o Designed to ensure personnel & equipment safety in case of a radiological accident
o MCR is maintained at a POSITIVE pressure of ≥ 0.1” WG relative to the Turbine Bldg
o Outside air is drawn thru Roll Filter D003 (& F016) & Roll Filter Bypass damper (F015)
o Filter train bypass dampers (F011 & F012) are auto closed & both filter trains are placed in operation to remove any radioactive particles from entering the MCR
o Outside air (thru filter train inlet valves F013A/B) combines w/ suction from MCR thru F014A/B at filter train inlet
o Air then flows thru the in service filter train (D004A/B) and fan (C012A/B) to the AHUs back into the MCR
119
What is the basic flowpath for MCREC in the Isolation mode of operation?
Big picture: All outside sources closed, One filter train in service drawing air from the MCR ONLY
o Outside intake dampers (F015 & F016) are closed to eliminate outside air supply
o One filter train is placed in service drawing a suction on MCR thru either F014A or B
o Air then flows thru the in service filter train (D004A/B) and fan (C012A/B) to the AHUs, then exhausted back into MCR
o All exhaust dampers (F019 & F020) are closed & MCR Exhaust Fans (C011A/B) are secured if running
o Air in MCR is simply recycled thru filter train continuously
o If the outside air supply is shut off and the MCR is placed into the isolation mode, the MCR will remain habitable in the isolation mode for ~ 14 people for at least 50 hours
120
What is the basic flowpath for MCREC in the Purge mode of operation?
o 1 Train of MCREC MUST be declared INOP in Purge Mode
o Outside air is drawn thru the roll filter bypass damper (F015) and the outside air intake damper (F016)
o Air is directed around the filter train thru the bypass dampers F011 & F012
o One AHU is placed in service depending on desired purge path in MCR (unit being purged has associated AHU secured).
o One exhaust train is placed in service depending on the desired purge path in the MCR
o Discharge is to the Rx Bldg vent plenum
o Air is also exhausted thru the Control Bldg Ventilation System exhaust duct & on to Rx Bldg Vent plenum
121
How many Drywell to Torus Vacuum Breakers are there? When will they open? What is the issue if they fail open/closed?
Drywell/Torus vacuum breakers -
i) 12 vacuum relief valves located inside Torus on continuous vent header w/ a direct flow path into DW
(1) 9 required to perform design function; 10 required operable for TS.
ii) Intended to return non-condensable gases from Torus to DW
iii) Completely open w/in 1 second after 0.5 psid applied across the seat – total combined capacity of 133%
If fail OPEN: lose suppression ability of the Torus, potential to exceed the internal pressure rating of 56#(54#)
If fail CLOSED: Lose the ability to relieve the Vacuum being drawn in the Drywell, if Drywell spray is initiated following steam release. This could lead to drywell exceeding the external pressure rating of 2 psig
122
What are the ATTS Power Supplies?
| Which SRVs are powered from ATTS?
RPS
P921/P923: RPS A
P922/P924: RPS B
ECCS
P925/P927: S129 (S105) off of 125 VDC A
P926/P928: U2 dual powered S002/S130 off of 125 VDC B. U1 powered from S106 only.
B (H) P925
G (A) P926
F (G) P925
D (C) P926
123
At what torus level does HPCI autoswap suction to the Torus? What about for RCIC?
HPCI: >152"
RCIC: >150.5"
124
Regarding the MSRs, when do the main supply valves/drains open/close?
RSSV - Open >120 MWe (Turbine Roll)
RSLLV - Open >120 MWe
RSDV - Open/Close 120 (170) MWe
EBPV - Open <120 MWe
RSCV - Open Turbine Roll, can't be closed w/o EBPV open
RSHLV - Open >620 MWe, Close <400 MWe
MSR Hotwell - <80 MWe to Condenser, >80 MWe 7th stg htr
1st Stage Drain Tank - <80 MWe to Condenser, >80 MWe 4th stg htr
2nd Stage Drain Tank - <160 (170) MWe to Condenser, >160 (170) MWe 4th stg htr
125
Which valves are open for Shell v Chest Warming of the Main Turbine? What is the Shell Warming HUR Limit?
Shell - TCVs open
Chest - TCVs closed, ISVs open
Shell Warming HUR Limit = 150 F/hr
126
What is the RPS Logic for MSIV/TSV/TCVs?
MSIV closure logic only trips in RUN
TSV and TCV only trips when >27.6% RTP
MSIV (Means and Extremes)
Closure of any: No Action
Closure of either MSIV in A/D or B/C: No Action
Closure of either MSIV in A/B or C/D: 1/2 Scram 'A'
Closure of either MSIV in A/C or B/D: 1/2 Scram 'B'
Closure of any 3 MSIVs: Full Scram
TSV
Closure of one: No Action
Closure of TSV combination may or may not (see MSIVs)
Closure of 3 or more TSVs: Full Scram
TCV
One-out-of-Two taken twice logic
ANY SINGLE TCV fast closure = 1/2 scram
127
What is the purpose of the Waste Collector System and Floor Drain Collector System? (Purity, conductivity, source, etc.)
Waste Collector System: Collect, store & process HIGH PURITY (low conductivity) liquid waste by means of filtration and ion exchange for reuse as makeup water. (Equipment Drains)
Floor Drain Collector System: Collect, store, and process LOW PURITY (high conductivity) liquid wastes for reuse or discharge to the canal. (Floor Drains)
128
What are the conditions for a generator runback to take place? What physically happens?
Generator Protection CKT Energized Annunciator - Auto runback to 25.6% (6466 Amps)
TCVs close to runback generator load
Initiation signals (Stator Water Cooling):
(a) Low Inlet Pressure – 35 psig (25.6 psig)
(b) High Stator Outlet Temperature - 81°C
(c) Low System Flow – 405 gpm
If generator amps > 6466 and initiation signal present
(a) Load must be < 20,232 amps within 2 minutes AND
(b) Load must be < 6466 amps within 3.5 minutes OR ELSE TURBINE TRIP
Generator must not be operated at any load for > 1 hr unless Stator cooling System is in service or Stator is drained & vacuum drained
129
What is the self-cooled rating for each generator? What must be done to Isophase Bus Duct Cooling if a fan trips?
Total loss of bus duct cooling occurs, the Main Generator output will have to be reduced to w/in self-cooled rating of the buses
i) 14,000 amps for U2
ii) 12,800 amps for U1
NO AUTO START OF STANDBY FAN, must be started w/ control switch
130
Regarding H2 v H2 Seal Oil, where are pressures maintained relative to one another?
Hydrogen Seal Oil vs. Hydrogen
a) Seal Oil Pressure Regulator 2N42F015 (1 N42R752) Open to raise dp
i) Maintains H2 Seal Oil Pressure 7-9 psi > Main Generator Casing H2 gas pressure
ii) Compares seal oil pressure to pressure in the Hydrogen Detraining Tank
131
What are the Condenser Vacuum Setpoints?
25” Hg Maintain vacuum above this limit with Main Turbine at >1200 rpm
24.8” Hg MCR Alarm for Main Condenser Low Vacuum
22.3” Hg Main Turbine Trip/U2 RFPT Trip if >3500 rpm
17” Hg U1 RFPT Trip if >3500 rpm
10” Hg Group 1 Isolation – MSIVs Close
7” Hg Main Turbine BPVs Close
132
Regarding H2O2 Analyzers, where are they monitored? How are they put in service? How long must you wait before accurate readings?
Monitored
i) P689 and P690
ii) SPDS
iii) Locally
H2 & O2 Analyzers - Takes ~ 80 min for H2 & O2 readings to stabilize
Two ways to change from Standby to Analyze mode of operation
(1) No isolation occurred
(a) Take mode switch on panel P33P601A/B from Standby to Analyze
(b) Depress the Channel A & B reset pushbutton on H11P700
(2) Isolation occurred
(a) Place BOTH key lock override switches in Bypass on H11P700
133
What are the Group 1 PCIS Initiation valves and signals?
Main Steam (x3 Hi's, x3 Low's)
B21-F022A-D, B21-F028A-D (MSIVs)
B21-F016/19 (MSL Drains)
B31-F019/20 (Rx Wtr Sample)
* Low RWL -101”
* Low Cond Vac 10” Hg
* Low MS Line Press 855 (850) in RUN
* Hi MS Line Flow 169 (136) psid
* Hi Temp Steam Tunnel 190 (185) °F
* Hi Temp Turbine Bldg 196 (187) °F
3x Normal MSL rad – isolates small bore pipe
(Ran up @ > 20%)
134
What are the Group 2 PCIS Initiation valves and signals?
```
Primary Containment
DW & Torus V & P (2” CAD & 18”)
DW Floor/Equip Drn
H2O2 Analyzer
TIP Withdraw
FP Monitor
RHR F040/F049
1/2E11-F015
```
• RWL Low + 3”
• Drywell High Pressure 1.85 psig
• R/B Exh Rad High (R609) 18mr/hr*
• R/F Exh Rad High (R611) 18mr/hr*
(R634) 6.9mr/hr*
(R635) 5.7mr/hr *
• Drywell Rad High 138 R/hr **
**Isolates D/W & Torus 18” V&P Vlvs ONLY
135
What are the Group 3 PCIS Initiation valves and signals?
HPCI (SELF)
E41-F002/3 (Steam Supply)
E41-F041/42 (Pmp Torus Suct)
* Steam Line Press HPCI Lo 134(128) #
* Exhaust Diaphragm Press Hi 10 #
• Leak Detection
o HPCI Area Air Temp 165°F
o HPCI Pipe Pen Rm 165°F
o Torus Temp 165°F 14(13.5) min TD
o Torus ΔT 36°F 14(15) min TD
• Flow HPCI Steam Hi 303%
+202 (218)” H20 d/p
-100 H20 d/p
136
What are the Group 4 PCIS Initiation valves and signals?
RCIC (SELF)
E51-F007/8 (Steam Supply)
* Steam Line Press RCIC Lo 95 #
* Exhaust Diaphragm Press Hi 10 #
• Leak Detection
o RCIC Area Air Temp 165°F
o Torus Temp 165°F 29(28.5) min TD
o Torus ΔT 36°F 29(28.5) min TD
• Flow RCIC Steam Hi 307%
+143 (199/173)” H20 d/p
-100” H20 d/p
137
What are the Group 5 PCIS Initiation valves and signals?
RWCU
G31-F001/4
* RWL Low Low -35”
* RWCU Differential Flow Hi 56 gpm for 42.5 s
• Room High Temp 140°F
o Pump Room
o Hx Room
o CUPS Room
• Room ΔT
o Pump Room 60°F
o Hx Room 60°F (45°F)
o CUPS Room 60°F (40°F)
F004 only
• NRHX Outlet Temp Hi 140°F
• SBLC Actuation (from MCR)
138
What are the Group 6 PCIS Initiation valves and signals?
SDC
E11-F008/9 (RHR Shutdown Cooling Suct Vlvs)
* RWL Low + 3”
* RPV Pressure >138 psig
139
What are the power supplies for the Main Steam line Rad detectors? What type of detector are they? Where are they located?
Power supply: RPS A/B
Ion Chamber detector
Located downstream of the outboard MSIVs in the steam chase
140
What are the power supplies for the Main Stack Rad detectors? What type of detector are they? Where are they located?
Power supply: 24 VDC A/B
Scintillation detector
Located in the main stack
141
What are the power supplies for the Off Gas Post-treatment Rad detectors? What type of detector are they? Where are they located?
Power supply: 24 VDC A/B
Scintillation detector
Located just prior to entering the main stack after the carbon beds
142
What are the power supplies for the Rx Building and R/F exhaust ventilation Rad detectors? What type of detector are they?
Power suppply: RPS A/B
Geiger Mueller detectors
143
What are the power supplies for the Liquid Process Rad detectors? What type of detector are they?
Power suppply: 24 VDC B
Scintillation detector
144
What signal cause the Kaman detectors to start up?
Hi-Hi on the Main stack detectors or Hi-Hi on the Rx Building Plenum (stack)
145
What is the impact of a secondary containment failure to isolate?
What should be an elevated release becomes a ground release
146
What type of logic is used for the MSL Rad Monitors? What happens if >3x full power background and we are ≤ 20% RTP? > 20% RTP?
1 out of 2 taken twice
>3x normal at ≤ 20% RTP causes:
MVP and SPE to trip
RX sample valves B31-F019/020 will isolate
> 20% RTP will get alarm on P601, but no isolations. Alarm on P603 is run up to 9.99 x E5
147
What signal will cause MCREC to shift to pressurization mode?
LOCA signal from U1 OR U2
1. 85 psig
- 101” RWL
Refuel Floor Area High Radiation from U1 OR U2
o ARM 1D21K601B OR 1D21K601D – 15 mR/hr
o ARM 2D21K601A OR 2D21K601M – 15 mR/hr
MSL high flow from U1 OR U2
o 169 (136) psid
o Required by Tech Specs
MCR air intake high Radiation (N015A/B)
o 0.9 mR/hr
MCR intake radiation monitor downscale (N015A/B)
o 0.017 mR/hr
Mnemonic: 1 Drunk Bastard at 2 A.M drank 15 beers and blew 0.9
148
If one of the trains for SBGT is in Standby (vice Auto), what causes that train to start?
The standby unit will only start on low flow of the in-service train. It will not start on any initiation signal.
149
Why do we inert the drywell?
a) Inerting primary containment with N2 lowers O2 levels to PREVENT an EXPLOSIVE mixture from developing when H2 produced during LOCA
150
If SBGT gets an initiation signal, how many trains of SBGT will be running 10 mins later with no operator actions?
On Unit 1, there is a common discharge path for the two trains of SBGT. This will cause one of the U1 trains to secure itself after a few minutes of operation.
151
How are the drywell chillers reset after a LOCA/LOSP? What about if the MCR was evacuated?
LOCA and LOSP Restoration:
- Keylock LOCA OVERRIDE switch to Bypass on P700 panel
- Link in associated DG bkr cabinet must be opened (De-energizes the 86 device)
- 86 device on compressor motor breaker locally reset
- Once the 86 device is reset, the reset pushbutton must be depressed locally for the chiller to be started
LOCA & LOSP Restoration during MCR evacuation:
- Open Link in the EDG panel (De-energizes the 86 device)
- Jumper installed bypassing the LOCA lockout
- 86 device on the compressor motor breaker must be locally reset
- Once the 86 device is reset, the reset pushbutton must be depressed locally for the chiller to be started
152
What action is required if a MSL High Rad alarm is received and the suspected cause is a fuel element failure?
Per 34AB-B21-001-2:
4.2 IF the source of a main steam line high radiation is suspected (OR confirmed) to be fuel element failure, AND
main steam line radiation levels are sustained at greater than three times normal, perform the following:
Critical
4.2.1 Enter 34AB-C71-001-2, SCRAM Procedure, AND
SCRAM the reactor.
And close the inboard/outboard MSIVs
153
Can a recirc runback occur with a speed hold reset alarm in?
Yes, runbacks can still occur.
154
What is the required jet pump flow in both recirc loops to consider both loops operable?
IF Recirculation Loop jet pump flow mismatch with both Recirc Loops in operation is:
a. >10% (7.70 Mlbm/hr) of rated core flow,
WHEN operating at <70% (53.90 Mlbm/hr) of rated core flow;
OR
b. >5% (3.85 Mlbm/hr) of rated core flow,
WHEN operating at ≥70% (53.90 Mlbm/hr) of rated core flow;
THEN the loop with the lower flow must be considered NOT in operation.
Note: U1 flow is 78.5 Mlbm/hr
155
How does the K648 logic process work?
First compares if other GEMACS are within 5" of Median.
If NO, then gives feedwater control system trouble alarm.
Then looks to see if B GEMAC is within 5" of Median.
IF NO, the looks to see if B GEMAC is upscale of downscale.
IF NO, then looks to see if Median is within 10" of the 0-200" Floodup meter (C32-R655) 2 sec average.
If NO, then uses B GEMAC as the output.
If YES for any of the previous steps, uses Median as the output
156
What causes the Motor suction pump to auto start? What about for the Turning Gear Oil Pump?
Motor Suction Pump Auto starts at: 20psig oil driven booster pump discharge pressure
TGOP: Auto starts if
```
- MSOP discharge press ≤ 200 psig
OR
- Bearing oil header pressure ≤ 25 psig
OR
- Bearing oil header pressure ≤ 15 psig
```
157
What causes the Emergency Seal Oil Pump (ESOP) to start?
| What is the power supply to the ESOP?
Auto starts when seal oil pressure reaches 95 psig
Power supply: 2R22-S019 (1R22-S017)
158
What is the power supply for the SBGT Fans?
A fans: 600C (1/2R24-S011)
B fans: 600D (1/2R24-S012)
159
What is the minimum Drywell spray rate to ensure a uniform drywell spray pattern?
Per 34SO-E11-010-1:
Drywell Spray flow rate must be at least 5,000 GPM to ensure an effective Drywell spray pattern
and pressure reduction (reference EOP/ SAG Appendix "C" calculations)
160
What are the power supplies for the Main Control Room Air Handling Units (AHUs)?
NOTE: ALL MCR AHUs are powered from UNIT 1. If you lose 600C/600D on U1, all AHUs will be lost.
AHU A: 1R24-S002 (600C)
AHU B: 1R24-S003 (600D)
AHU C: 1R24-S029 (from 1R24-S003, or 1R24-S002 alt)
161
When is pre-warming of the RWCU NOT required? What is the allowable heatup rate if pre-warming is required?
Per 34SO-G31-003-2:
IF Pump Casing Temp (Local) is WITHIN 100F of Reactor Coolant Temp
AND
Regen Heat Exchanger Inlet Temp (2G31-R607, 2G31-N601 point 1) is WITHIN 250F of Reactor Coolant Temp,
THEN prewarming is NOT required.
The heatup rate limitations are as follows:
o RWCU Pump casing temperature, < 10 degrees F per minute.
o 2G31-R607 Pt. 1, Rx water, < 10 degrees F per minute.
162
When is a SCRAM required with a control rod (or rods) drifting out?
Per 34AB-C11-004, SCRAM is required when:
Any power:
- More than 1 C/R drifting out
OR
has drifted out
- More than 4 C/Rs mispositioned greater than 1 notch
Less than 21% (20.6%) RTP:
- 1 OR more C/Rs drifting out
OR
has drifted out
163
If the A Loop RHR is in SDC, and Reactor water level decreases to the LPCI initiation setpoint, what will be the status of the RHR pumps 3 minutes later (no operator action)? What action (if any) is required to begin injection?
o As RWL decreases to +3"
- SDC Suction Isolations Valves F008 and F009 will close.
- RHR Inboard Injection Valve F015B will close.
- RHR pump will trip due to F008/F009 closure (No suction source).
o When RWL reaches -101”, F015B will open,
however, RHR pumps will NOT start due to a suction lineup trip. Manual re-alignment of suction is required.
o RHR Hx Bypass Valve F048B will open at -101”
o No suction path exists for the pumps unless the operator manually closes the F006 valves and opens the F004 valves.
Will have to align suction path (close F006, open F004) and take control switches for pumps to STOP, then back to START
