Pri / Sec
These are the things and stuff that happens following the MDAFW pump start signal on an SI (assume EDGs DO NOT LOAD)
SW A&C - 15sec
SW B&D - 20 sec
SW E&F - 25 sec
Cont fans A&C - 38 sec
Cont fans B&D - 45 sec
At what count rate will the plant tell you that a possible boron dilution accident is occurring?
1350cps =/- 150cps
We're running G02 in local control for an exercise run it's currently at idle speed and we're preparing to raise speed. The welds on the steam header in containment fail which causes SI to actuate. Simultaneously, an electrical fault occurs on the feeder breaker for 2A05 from 2A03.
What is the status of all EDG's and safeguards power for BOTH units?
G01, G03, G04 are running unloaded
G02 running at previous speed
All safeguards power is fine except Unit 2 "A" train safeguards has left the chat.
Tave is 327F and rising due to preparations for Rx S/U.
Containment indications show that containment pressure is 0.75psig and 125F.
What, if any, LCO's are met and/or not met by these indications?
LCO 3.6.4 Containment pressure is MET (0 +/- 1psig)
LCO 3.6.5 Containment air Temp is NOT MET (</=120F)
A closed water tank is pressurized with N2. A D/P detector is used to measure the tank water level.
To achieve the most accurate water level measurement, the low pressure side of the detector should sense which one of the following?
a. pressure at midline of tank
b. atmosphere outside of tank
c. pressure of a column of water external to the tank.
d. pressure of the N2 at the top of the tank.
D. Pressure of N2 at the top of the tank
Unit is at RTP and then random clicking starts happening with alarm(s). You notice that CV-112A has diverted to the cHUT's. What failure do you expect to see on C04 vertical section, and what will the plant continue to do without operator action?
LT-141 has failed high.
VCT high level alarm
VCT actual level drops until auto makeup starts via LT-112 and level will attempt to modulate between 17-28%
We have just Blocked SI.
Explain at what pressure the plant is approximately at and what SI signals have AND have NOT been blocked.
1990 psig
Blocked: PZR Pressure and Steam Line
NOT Blocked: Containment pressure, Manual
You're an electron doin your thing on the grid. You decide to see what's up at PBN. When meeting up with your homies they tell you about this sick system called "dirty power" and you want to see what it's all about. How do you get from the grid to dirty power on the Red/Blue Inverters?
Grid -> H01 -> X08 -> B08 -> B09 -> PP54 -> XY08 -> Y-15 -> Y-16
Per the TRM, what systems shall be functional to support Turbine Overspeed?
a. Stop valves and Gov valves
b. Mechanical overspeed trip system
c. IOPS
d. Crossover steam dump system
Notes:
1. Either the mechanical overspeed OR IOPS may be non-functional </= 1518MWth
2. Crossover steam dumps only required >/= 1518MWth
Explain the operation and power supplies of 1(2) CW-3501/3502
Must be closed to start pump
Begins to open when pump breaker shuts
Pump breaker doesn't open until valve is shut
Valve closes on pump trip
U1- 2B43, U2 - 1B43
Imagine you're a molecule of steam. You have been chosen to participate in the heating of feedwater. What path are you going to take from the Main steam header directly upstream of the HP turbine until you meet up with your homies in the condensate system?
MS header -> HP turbine -> 4th stage extraction -> BTV -> #5 FWH -> #4 FWH -> HDT -> Condensate system
What inputs does PCV-431C need in order to open on its own? (Assume any PT inputs are from NORMAL source)
Switch in Auto
Both 449 (yellow) and 431K (via 431 Blue) > 2335psig
List the MCCs that leave the chat during SI's (both units) AND their "parent" busses
1B03: 1B31
1B04: B43
2B04: B21
2B03: B33 & 2B31
LCO 3.0.3 . . . ready go
When an LCO is not met and the associated ACTIONS are not met, an associated ACTION is not provided, or if directed by the associated ACTIONS, the unit shall be placed in a MODE or other specified condition in which the LCO is not applicable. Action shall be initiated within 1 hour to place the unit, as applicable, in:
a. MODE 3 within 7 hours
b. MODE 4 within 13 hours, and
c. MODE 5 within 37 hours
List all 480 pumps/motors/equipment that strip on SI
PZR heaters (unit specific)
SA compressors (unit specific)
SSG Feed Pumps (Either unit will trip both)
Electric Fire Pump (Unit 1 only)
While doing a walkdown of the boards you notice an amber light lit within the RHR system.
What valve is this, what is the amber lights purpose, and how was this valve operated to get the amber light to light?
SI-852
The amber light indicates that the valve is 43% shut.
Taking the switch to close (from full open) will auto set the valve to 43% open, then the valve becomes a demand valve from that position to full shut. Feature is to limit flow for pump runout during piggyback operation with SI & CS
Little Timmy is standing his first ever CO U/I watch. He's freaking out that his rod speed is on the indicating scale.
With no active rod motion, what speed(s) could be indicating on his meter? What switch(es) would cause this indication?
Rod speed could be indicating either 36 or 64 spm.
The control bank selector switch is in ANY position other than Auto.
36 for Manual / Individual Bank
64 Shutdown Bank
Explain the load capabilities of the 1(2)X03 transformers
One X03 is capable of carrying both units aux loads at power (ie: safeguards)
One X03 is also capable of carrying loads for one unit experiencing safeguards actuation and the other in safe shutdown
But one X03 would be over-rated by a dual unit trip or one unit in SI actuation and the other unit trips
LCO statement and applicability for 3.4.3 RCS P/T Limits
also, generally speaking what's the cutoff for the 30 minute action and the immediate action?
RCS P/T and HU/CD rates shall be maintained within the limits of the PTLR
At all times
Modes 1-4 ( 30 min), Modes NOT 1-4 (immediate)
Maximum fuel cladding integrity is maintained by:
a. always operating below 110% design pressure
b. actuation of the RPS system upon a Rx accident
c. ensuring actual heat flux is always less than critical heat flux
d. ensuring operation above the critical heat flux during all operating conditions.
C. ensuring that actual heat flux < critical heat flux
Unit 1 is at RTP. A failure happens and Rx Power starts to rise, you notice steam flow and feed flow are rising as well as CSD's start to modulate open.
The following annunciators are lit:
Tave Deviation, Tave high, Tavg Steam Dump alert
What happened, and what failure(s) / malfunction(s) / mispositioned equipment could have caused this?
A Tavg channel has failed high with the CSD mode select switch in manual.
What are all the possible ways that the Feed control system will cause all the rods to muster at the bottom of the core?
2/3 SGWL in either S/G (31% or lower)
1/2 SGWL in either S/G (31% or lower) AND 1/2 SF/FF Mismatch
What are the power supplies for W-3A/B [CRDM Shroud Fans] and what is special about them (electrically speaking)
1(2) B01/B02
Do NOT strip on UV
Unit 2 just transitioned to Mode 4 from Mode 3. For whatever reason, both CST's are found to be aligned to Unit 2. Both CST's have 7,000 gallons of CST flavored water in them. Is this an issue? Why or Why not? (Regarding Tech Specs only)
Yes. LCO 3.7.6 is NOT MET. 2 CST's supplying one unit are OPERABLE with >/= 14,100gal [6ft]
Regarding TGLO: What system/components minimize turbine vibration and prevents chattering to bearings 3-6?
How does this system start to provide this function AND how can you tell in control that it is running?
Bearing Lift Oil system (pumps)
Auto start on >10psi suction pressure and < 600rpm
With all 4 lift oil pumps running and > 600psi discharge causes a red light on C03.