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2020-2021 > 4501 & 4502 > Flashcards

4501 & 4502 Flashcards

1
Q

Why should the Integrity status tree be disregarded during E-3?

A

False reading possible in ruptured loop CL indication w no RCPs during a SGTR. This is because of pooling.

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2
Q

Why will SG Level rise more quickly with RCPs tripped?

A

Less heat transfer because the SG is not steaming as much.

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3
Q

Why is there an overfill concern during a SGTR with no RCPs?

A

Loop transport times will result in a slower cool down

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4
Q

When cooling down in E-3 using the dumps, what should you not do? And why!?

A

Do NOT use Turbo bc it can cause a SLI

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5
Q

What is the purpose of getting the Pressurizer to the saturation temperature of the ruptured SG pressure?

A

To minimize flow between the RCS and SGs

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6
Q

What is the equation for figuring out a new leak rate after a change in pressure?

A

Leak 2 / Leak 1 = (square root of DP2) / (square root of DP1)

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7
Q

If you lose 2 PR NIs, what happens?

A

It takes out your source range and will trip you during a start up (

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8
Q

What are OTDT inputs?

A

DT
Tave
AFD
Pzr pressure

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9
Q

What does OTDT protect from?

A

DNB

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10
Q

What are the inputs to OPDT?

A

DT

Tave

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11
Q

What does OPDT protect from?

A

KW/Ft

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12
Q

At 8% power and under compensated, what does this look like? Why?

A

Both intermediate range NIs look the same because neutrons are overwhelming.

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13
Q

After a trip, what do the intermediate range NIs look like if one was under compensated? What does this prevent?

A

The NI that is under compensated will give a false high indication. The intermediate range current will stay above the P6 setpoint, preventing the source range detectors from auto energizing

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14
Q

What is the back up auto deenergization for the source range NIs?

A

P10

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15
Q

At 100% power, what happens if a power range NI fails off scale high?

A

Rods will insert, but they will not come back out because of the C2 Rod stop

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16
Q

When above the point of adding heat, what does moving rods cause?

A

The reactor power will follow steam demand

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17
Q

When below the point of adding heat, what will moving rods do?

A

Adds reactivity, but no effects are seen

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18
Q

What does bank overlap provide?

A

More uniform AFD and more uniform differential rod worth

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19
Q

What is QPTR for?

A

Radial flux

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20
Q

What will a dropped rod affect?

A

QPTR AND RADIAL FLUX

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21
Q

What will maintaining a AFD and QPTR do for us?

A

It will maintain power density and DNB in spec

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22
Q

If above 90% power and not within the target band what must we do per tech spec?

A

Get back within target band or below 90% power within 15 minutes

Must be either less than 90% or back within target band within an additional 15 minutes

If you cannot accomplish target band within a total of 30 minutes, you must be under 90% power!

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23
Q

What happens to voltage and current if you lose a battery charger and you were on the battery?

A

Voltage will go down

Current will go up

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24
Q

How long is the 250 V DC battery good for during a loss of offsite power?

A

3 hrs

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25
Q

How long is the 250 V DC battery good for during a Station black out?

A

4 hrs

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26
Q

If you have CCW in or out leakage when on RHR, what must you do within one hour?

A

SDM

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27
Q

If there is a fire on the unit one main transformer, how many fire pump should be running?

A

2

28
Q

What are the manual actions that must be taken during a main transformer fire if parallel to the grid?

A

Trip the generator and verify deluge actuates

Turbine trip if < P8

Reactor trip if > P8

29
Q

If the control room is destroyed and you are in the SAMGs, what would you prioritize the use of an AEO for?

A

Starting TDAFP

30
Q

What would be an entry condition for SAMGs?

A

CETCs >1200 degrees

31
Q

During SAMGs, why is it important to maintain SG Level?

A

To prevent creep rupture failure

32
Q

During a large break LOCA, what are the consequences if the contents of the spray add tank are not used?

A

Iodine will not be kept in solution

33
Q

During a large break LOCA, what happens if too much of the spray add tank contents are put in?

A

Chloride and caustic stress corrosion of equipment can occur

34
Q

Which Signal causes a CTS pump to start?

A

Phase B

35
Q

Which signal causes the valves to realign for the CTS system?

A

CTS signal

36
Q

If unable to verify natural circulation, what should be done?

A

Raise steam demand. Dump more steam with the steam dumps

37
Q

What can interrupt natural circulation?

A

Voids. Monitor using the NR RIVLIS

38
Q

What is the potential outcome from over filling the steam generators in E3?

A

May rupture the main steam line from weight of water and water hammer.

This could damage the PORVs, safeties and TDAFP as well

39
Q

Why is the SG PORV’s set point changed to 1040 psig during E3?

A

Minimize release

40
Q

When in E3, under what conditions is there a release in progress?

A

ALWAYS!

41
Q

Which factor of the 5 factor formula is affected most by control rods?

A

Thermal utilization factor

42
Q

What happens to control rod worth as moderator temperature rises?

A

It goes up

43
Q

What happens to rod worth over core life? Why?

A

Rod worth goes up.

Less boron due to fuel burn out, less competition between the control rods and boron, and neutrons are more likely to be absorbed by the control rod

44
Q

What do you rod insertion limits ensure?

A

That rods will be more withdrawn as reactor power rises to compensate for the change in power defect

45
Q

What will cause the reactor to trip on the loss of 250 V DC?

A

RCP Bus under frequency because 250 V DC powers it’s relays

46
Q

What is the input to the main feed pump DP program variable support

A

Total steam flow

47
Q

What point does the rod insertion limit comparator use?

A

Auctioneered High Delta T power

48
Q

At the bottom of the core is DNBR higher or lower? Why?

A

Higher because temperature is cooler

49
Q

Where in the core is DNBR the lowest?

A

Upper mid plane because more heat flux is occurring in that region

50
Q

What is the purpose for the basis for the limit on maximum linear power density?

A

To provide assurance of fuel integrity

51
Q

What are the dose limits for EDMGs?

A

5 Rem Whole body for damage assessment

10 Rem whole Body per incident to protect valuable equipment

25 Rem whole body lifetime for lifesaving

52
Q

If you manually actuate the CTS gold switches, what happens?

A

CTS signal
Phase B signal
CVI

NO Steam line isolation!

53
Q

Where is the 2.8 psi sensed that gives you a CTS, SLI and phase B signal?

A

2/4 in LOWER containment

54
Q

Which valves reposition on a CTS signal?

A

CTS pump discharge valves and the spray add tank valves.

Heat exchanger valves only reposition when also on recirc sumo

55
Q

What will the spray add tank lo lo level do?

A

Closes the spray add tank outlet valves and eductor valves

56
Q

Why should the hydrogen Recombiners not be started while in modes 1-4?

A

Concerns with overloading the EDG

57
Q

Why are the CRDM fans placed in stop and lower containment fans placed to off during CTS?

A

To prevent them from restarting when phase B is reset, does possibly overloading the EDG

58
Q

Why wait 50 mins to put RHR spray in service when only having one train of CTS?

A

Because decay heat is low enough that one safety injection pump and one charging pump are sufficient to cool the core

59
Q

What happens to pressure and flow when centrifugal charging pumps are in series?

A

More pressure

60
Q

What happens to pressure and flow when centrifugal charging pumps are in parallel?

A

More flow

61
Q

What happens when positive displacement pumps are in series?

A

No change in Flow

62
Q

What happens to positive displacement pumps when in parallel?

A

Flow is additive

63
Q

What are the pump laws?

A

Flow ~ Speed

Head ~ Speed ^2

Power ~ Speed ^3

64
Q

When should RCPs be stopped for the best natural circulation flow?

A

Closer to the trip

65
Q

What cools the head during natural circulation?

A

CRDM Fans

2020-2021 (4 decks)

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