Wire biting is fun
What is the most likely cause of this alarm tile and what needs to be done to restore the alarming equipment to service?
D-08 Battery Charger trouble Alarm.
Need to either reset SI OR shut normal feeder to 2A06. Then reset and shut the contactor.
Let's assume the Pressurizer is filled to 90%. As the pressurizer drains to 10%, what are the significant water levels where protective actions / setpoints / normal range(s) for Pressurizer level control?
88% - TS high level limit for Modes 2&3
80% - High Level Rx Trip
70% - HLA
20-46.1% - Normal Operating Range
12% - Letdown and Pzr Heater cutout/isolation
What will shut MSIV(s)?
Manual
1/2 Hi Steam Flow, 2/4 Tave <543, SI
1/2 Hi Hi Steam Flow, SI
2/3 Containment Pressure >15 psig
Little Timmy declares that Unit 1 RTA is inoperable. Per TS, how long to we have to restore this breaker to operable status?
IF RTB is operable: 8 hours
IF RTB is not operable: 1 hour (or within the Risk-Informed Completion Time) to restore RTA to operable status
Both units are at RTP. What is the Minimum number of qualified bodies required to make up a watch team. (Licensed and Non-Licensed)
2 SRO
4 CO
1 Lead AO
2 EP-EPies
4 AO's (Fire Brigade)
The electrical distribution system is in a normal configuration with the exception that 2DY-03 is Out of Service and the Unit 2 white channel is being supplied by DY0C. I&C convinces the Unit 1 OS that they need to do urgent calibration within 1DY-03 and need to take it out of service. The OS directs you to place Unit 1 white channels onto DY0C.
Is this possible? Why or why not?
Physically, yes it is possible. However, administratively we can only have 1 unit on the alternate inverter at a time.
Normal and Alternate Power supplies for Unit 2 Charging Pumps: ____?
A: Normal 2B03/ Alt B09
B: Normal 2B03 / Alt 1B03
C: Normal 2B04 / Alt None
What will cause CREFS to shift to Mode 5 (automatically)?
Explain what happens to fans in the CREFS systems upon a valid signal to shift to Mode 5, include all applicable time delays if fans start AND fail to start.
A Loss of Power 1Y06 / 2Y06 OR one of the Automatic Initiation Signals
Either train Containment Isolation from either Unit, RE-101 High Rad, RE-235 High Rad
These contacts open to deenergize the arming relays, AUX-1 & 2. – (Trip running Fans)
This causes the following:
• Deenergizing of 3 Time Delay Drop-Out (TDDO) relays.
— TDDO-2 is set at 20 seconds for starting W-14B and W-13B2.
— TDDO-1 is set for 41 seconds to start W-14A and W-13B1 if interlock is met.
o Interlock: If W-14B/W-13B2 does not start it receives a stop signal and W-14A/W-13B1 starts
— TDDO-1A is set for 50 seconds for Low Flow Alarm on C01.
• Opens a contact to trip W-14A and B and W-13B1 and 2
Unit 2 is in Mode 6 preparing to unload the core. Little Timothea, the sister of Little Timmy, comes into control with chemistry sampling reports for the shift. OS2 is reviewing the SFP boron concentration and notices that boron concentration is 2200ppm. Is this in violation of Tech Specs? If so, what should OS2 direct the watch team to do?
Yes. 3.9.1 Boron Concentration states that the RCS, Refueling canal, and the refueling cavity shall be >/= 2350ppm [B].
Suspend activities that will add positive reactivity - Immediately
Initiate action to restore boron to within normal limit - Immediately
Per administrative procedures, what are the work hour restrictions regardless of unit mode?
You're preparing to take the watch as the 4th license. During your board walkdown, you notice the Diesel Mode selector switches in the following positions:
G01: Auto
G03: Exercise
G04: Local
G02: Exercise
Assuming all other EDG switches are aligned for normal steady state operation, what EDG's will start if both units simultaneously have an SI actuation?
G01, G03, G04 will auto start to ready to load condition
G02 will not start
Little Timmy is getting a knowledge checkout on RCP seals, he's really confused about the shutdown seal. Explain to him what this seal is, how it is activated, and what needs to be done on indications that it has activated.
It's a seal that is located between the #1 and #2 seals. It will auto activate at 280F, if actuated the RCP shaft should be stopped to prevent damage to this seal.
Prevents a loss of reactor coolant system (RCS) water inventory should an event occur that causes a loss of all seal cooling
PT-478 fails to 1100psig. What happens to Rx power and why? (Assume Little Timmy is on watch and blue screens)
Rx power will rise due to a rise in steam demand from 1MS-2015 popping open.
Unit 1 is Mode 1 at RTP, Unit 2 is shutting down for outage and is currently at Tave = 185F. Little Timmy, as third license, gets an alarm on C01. He announces that the annunciator for Unit 1 motor breaker trip is lit.
What motors will cause this alarm?
In searching for the cause of this alarm, C01 OATC notices that P-32C which was previously running is no longer running and the white light is lit above its control switch. Regarding Tech specs only, is this an issue?
Unit specific CS, SI, CAF
Unit 1 MDAFW, Both SSG
SW A, B, and C
No, LCO 3.7.8 is still met with all other SW pumps available to supply cooling to required loads.
Define an expected alarm and give four examples of plant evolutions when an expected alarm would be expected.
“Expected” alarms are those alarms which occur in the normal course of plant operation.
-Starting / Stopping pumps
- Testing components / calibration
- Changing Plant Status
- Alarms identified to be expected prior to receipt.
What are the Generator Breaker trips on G07?
Control Switch to trip / breaker local trip button
Anti-motoring protection
Overload
Synch selector switch to OFF and motor breaker opens
Power supplies to W-30A, W-30B, W-21A, and W-21B
A's - 1B-42
B's - 2B-32
If actual blowdown flow is lower than what PPCS accounts for, is this a problem? Yes or no and why?
Yes this is a problem. Heat balance stuff that Justin doesn't necessarily understand happens. Effectively the calculated Rx power will be lower than actual Rx power and therefore non-conservative.
Little Timmy is trying to regain some composure and credibility with his crew. He's the 4th license and Unit 2 is performing Physics testing at approximately 3% Prx. He notices that AFD is outside the normal band and recommends that we restore AFD to normal band within the next 15 minutes in accordance with Tech Specs. Is he correct? Why or why not?
In a proportional controller, the term "offset" refers to the difference between what?
a. control point and setpoint
b. control point and proportional band
c. deadband and setpoint
d. deadband and proportional band
a. control point and setpoint
What 4 major breakers will open if I lose power to D11 and D12?
Unit 1 RTA and BYB
Unit 2 RTA and BYB
What is the expected CVCS lineup for a Dilution? (Not Alt Dilute)
CV-111 - Throttled
CV-110A - Shut
CV-110B - Shut
CV-110C - Open
Little Timmy is back on watch on Unit 1. We're cooling down the plant via condenser steam dumps in manual control. (CSD mode select switch is manual, 1HFC-484 is in automatic) When he attempts to lower the automatic setting, an electrical perturbation causes the complete loss of the Red Instrument bus. Does this loss affect the capability of the CSD system? If so, explain how to restore cooldown capability with the CSD's.
Red Instrument Power supplies PT-484, upon a loss of this power, CSD's will NOT operate in Manual-Auto control (Pressure control). CSD's will have to be controlled via Manual-Manual by taking 1HFC-484 to manual.
Per the TRM, what must be done if the LEFM is deemed not functional after the completion of the SR?
Initiate action to reduce Prx </= 1775 MWth immediately
What "two" radiation monitors will DIRECTLY cause a CVI?
1(2) RE-212
1(2) RE-305