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2020-2021 > 4505 > Flashcards

4505 Flashcards

1
Q

What do the FSGs Protect?

A

Core Cooling

Containment

SFP Cooling

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2
Q

What is the purpose of the Deep DC Load Shed and how long do we have to do it?

A

Extends battery life

Within 1 hour of declaring ELP

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3
Q

What is the 500 kW Power preferred to provide power to Bus 11D/11B (21D/21B)?

A

It will give us batteries

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4
Q

Why is reflux cooling a problem?

A

It will result in pockets of diluted water forming in the RCS Legs that could cause a recriticlity issue

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5
Q

What is indicative of a #2 Seal failure on a RCP?

A

RCP Seal #1 Leak off Flow Lowering

AND RCP Seal #2 Standpipe his level alarm LIT

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6
Q

What conditions require a Reactor Trip during Excessive RCS Leakage?

A

PRZ Level not maintained with 2 CCPs

Containment Pressure is approaching 1 psig

VCT Level cannot be maintained

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7
Q

At what frequency must we trip the Reactor?

A

58.2 Hz

OR after 30 mins if below 59 Hz but about 58.2 Hz

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8
Q

What is the set point for degraded bus voltage?

A

113.2 Volts for 9 seconds on T11A/D

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9
Q

How long before transfer on degraded bus voltage if there is a SI or Lo-Low SG Level?

A

When on UATs, just the original 9 seconds

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10
Q

How long before power is transferred from UAT to RAT on degraded bus voltage?

A

9 seconds of condition + 90 Seconds to Fast Transfer to the RATs

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11
Q

How long will it take to transfer from the UATs to the EDGs on degraded bus signal with no SI / Low Low SG Level?

A

9 seconds to sense, 90 seconds to the RAT, 21 secs if degraded bus voltage still exists

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12
Q

How long will it take to transfer power to the EDGs if on the RATs and a degraded Bus Voltage problem exists?

A

111 seconds (90 seconds + 21 seconds)

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13
Q

If T11A senses degraded bus voltage, is it the only one that will transfer to a new power source?

A

No

Although sense on the pump busses, it also strips off the other bus on the same train.

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14
Q

What are the auto actions for DBV?

A

Sensed on pump bus for the train. When on the UATs, will result in a transfer to the RATS. If not, the next 21 seconds of the DBV will result in opening the RCP bus tie breaker.

DBV when already aligned to the RATs will open the RCP bus tie breaker at the 111 second point

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15
Q

What decides the SG Pressure input to SG PORV?

A

Which every Steam Pressure Selector is selected

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16
Q

What decides the SG Pressure input to the Steam Flow Density Compensation?

A

Which ever Steam FLOW selector is selected

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17
Q

Which forms should be completed before making notification to the NRC?

A

Att 11 - NRC Notification

&

Data Sheet 2 - Plant Status

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18
Q

How long do you have to complete notification to the MSP and BCSD?

A

15 mins

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19
Q

How is the notification time to the MSP and BCSD measured?

A

Begins when SM/STA agree on the classification

Ends when EMD-32 data has been read to both agencies

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20
Q

Which SED Duties can NOT be delegated?

A

Classification of the emergency

Directing the notification of offsite officials

Approval of PAR to offsite emergency management agencies

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21
Q

To utilize EP, why must you have a dead bus?

A

30 degrees out of phase

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22
Q

To power a T bus from EP, it requires the respective bus to be deenergized. We are intentionally giving ourselves a Load Shed on that Bus. With this load shed signal present, how can we close the EP breaker?

A

EDG Output breaker is placed in PTL, which will disable that load shed

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23
Q

What condition must be satisfied to enable BOTH auto and manual closure of the EDG Output breaker?

A

EP Breaker must be open

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24
Q

The Engineered Safety Electrical System is designed to ensure power is available to:

A

ALL safety equipment during design basis accidents

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25
Q

What happens if normal Power to the CRID is lost?

A

Auto Transfers to its alternate 600 VAC Power supplie

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26
Q

What is the normal power supply to the CRID Inverters?

A

250 VDC

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27
Q

What happens if normal power is lost to the CRID Inverter and then it returns?

A

Auto Transfer back to its normal source of power after a 30 second time delay. It will transfer to alternate one more time and stay there until the auto retransfer lock out is reset.

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28
Q

What is the operability status of the CRID Inverters if they are not being fed from the 250 VDC normal power supply?

A

INOPERABLE

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29
Q

What is the Operability status of the CRID Buses when powered by the alternate 600 VAC power supply?

A

OPERABLE

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30
Q

What are the associated 600 VAC Power supplies for each CRID Distribution Panel?

A

CRID 1 - C
CRID 2 - D
CRID 3 -A
CRID 4 - B

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31
Q

What is a backup power supply to the CRIDs?

A

CRP-3

32
Q

What will cause a Loadshed?

A

2/3 on EACH T bus at 94 (93) Volts, w a 2 second time delay

33
Q

What will cause a Load Conservation?

A

Load Shed with a SI or CTS Signal

34
Q

What happens on a Load Conservation?

A

LO Cooler Motor Operated Valves close

Containment NESW Valves Close: CUVs, CIRs, RCP air (NOT CLVs!!)

Unit Valve to Misc Header closes

NESW Pump trips if there is a CTS Signal (restart after 75 secs after going to lockout)

35
Q

When would the degraded Bus Voltage actuate load shed relays in 9 seconds?

A

SI Exists

Or

Low-Low SG Level in a single SG

36
Q

Which Load is shed by the Load Conservation energized by LOOP and CTS?

A

NESW Pump

37
Q

What actions would you take if you noted that 69kV was showing a voltage of 110 V on EP Bus 1 while supplying power to T21 D during Mode 6?

A

Adjust Load. Remove loads on T21D to improve voltage

38
Q

What condition would cause a load conservation signal to be generated for the Unit 2 CD EDG?

A

Train A SI with LOOP

39
Q

What are the advantages of using ES-3.1, Backfill?

A

Minimizes Radiological Releases.

40
Q

What are the advantages of using ES-3.2, Blowdown?

A

Minimizes Radiological Releases and Boron dilution

41
Q

Why would we want to use ES-3.3, Steam Dump

A

Fastest of the 3 cool down methods

42
Q

When wanting to avoid an environmental release, which cool down method would we use: ES-3.1, 3.2 or 3.3?

A

ES-3.1, Backfill

43
Q

Which cool down method cools down the RCS and Depressurizes the RCS Concurrently: ES-3.1, 3.2 or 3.3?

A

ES-3.1, Backfill

44
Q

When using ES-3.2, Cooldown using Blowdown and 3.3, Cooldown with Steam Dump, how is leakage between the ruptured SG and the RCS Controlled?

A

Cooldown is done first. The ruptured SG level is monitored and adjustments are made to RCS pressure and charging to keep it constant

45
Q

If there are multiple ruptured SGs, which procedure should we be in?

A

E-3, SG Tube Rupture

46
Q

What are some conditions that require a transition to ECA-3.1?

A
  1. SGTR with LOCA
  2. Faulted, Ruptured SG
  3. SGTR with ALL SG Stop valves failing to close
  4. Minimum dP (250#) between ruptured and intact SGs can’t be maintained.
47
Q

Why would we transition from ECA-3.1, SGTR with loss of RC - sub cooled recovery desired to ECA-3.2, SGTR with loss of RC- saturated recovery desired?

A
  1. RWST level is low with NO corresponding rise in containment sumps
  2. Ruptured SG Level is HIGH. SG Overfill is imminent
48
Q

In ECA-3.3, SGTR without PRZ Pressure Control, the first major action is to restore pressure control What must occur to proceed to the SI Termination steps in this procedure and stop waiting for pressure control?

A

Ruptured SG Level >67% and PRZ Level > 21%

49
Q

ECA-3.3, SGTR without Pressurizer Pressure Control directs operators to adjust charging flow to maintain sub cooling, NOT to restore PRZ Level. WHY?

A

Raising PRZ Level would raise RCS Pressure, which would raise RCS Leakage

50
Q

What happens to the Thermal Utilization Factor (f) as fission product poison concentrations go up?

A

Thermal Utilization Factor LOWERS because of competition. This causes negative reactivity

51
Q

What is a fission product poison?

A

A fission product that has a substantial neuron absorption cross section and does not fission

52
Q

What makes a good poison?

A

High abundance and large barns

53
Q

Which of the 3 (fission, decay, neutron absorption) are contributors to production and which contribute to removal?

A

Fission - Production
Neutron Absorption - Removal
Decay - Both

54
Q

What percentage of Xe-135 production is caused by direct fission?

A

5%

55
Q

What percentage of Xe-135 production is caused by I-135 decay?

A

95%

56
Q

What happens to Xe-135 concentric on a unit trip after operating for 200 days at 100% power? Why?

A

Rise due to iodine decay in the core

57
Q

What type of decay chain can products Xenon-135?

A

Beta - decay of Te-135

58
Q

Why is Xe-135 a major reactor Poison?

A

High production from fission and Large absorption cross section

59
Q

What percentage of Xe removal is from decay?

A

20% from Beta - decay

60
Q

What percentage of Xe removal is from burnout?

A

80%

61
Q

Approximately how long will it take fro equilibrium Xenon to be reached?

A

40 hours

62
Q

How does Xenon compare at 100% power versus 50% power?

A

50% power Xenon is approximately 80% of what it is at 100%

63
Q

How does Xenon compare at 25% power in comparison to 100% power?

A

25% power equilibrium is about 1/2 of what it is at 100% power

64
Q

How long does it take to reach the Xenon Peak after a power change?

A

Square Root of the % change in power

65
Q

What effect does core age have on Xenon?

A

Xenon concentration Lowers, but Xenon Reactivity becomes more negative due to less competition

66
Q

What can affect both the production and removal of Xe-135?

A

Thermal Neutron Flux Level

67
Q

How will the Xenon-135 production terms (direct fission and decay of iodine) change when a reactor is quickly rambled up to 100% power from a steady state 50% power?

A

Fission Term increases and Iodine Decay term increases as iodine builds in

68
Q

Which Reactor will have a Higher Peak when tripped?
Reactor at 50% power
Reactor 100% power

A

Higher Peak will be the reactor at 100% power.

69
Q

How much more water is required to dilute 1 ppm at the EOL compared to BOL?

A

10X more water is needed at EOL

70
Q

Following a refueling outage, what is responsible for the majority of the rapid initial decrease in critical boron concentration?

A

Fission Product Poison Buildup

71
Q

Why must there be a large increase in full power boron after refueling compared to EOL?

A

Reactivity from fissionable fuel in the core at BOL is greater than EOL

72
Q

During a 6 month period of full power operation, the Reactor coolant boron concentration must be decreased steadily to compensate for _____?

A

Fuel Depletion and build up of fission product poisons

73
Q

As reactor coolant boron concentration is reduced, what happens to boron reactivity worth?

A

It becomes more negative due to decreased number of boron molecules in the core

74
Q

The amount of boric acid required to increase the coolant boron concentration by 50 ppm at BOL is approximately _____ as the amount required to increase boron concentration by 50 ppm at EOL.

A

The same!!!!!

75
Q

Xenon poisoning in a reactor core is most likely to prevent a reactor startup following a shutdown from _____ power and the ____ of life.

A

High Power

End of Life

2020-2021 (4 decks)

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