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ILT SRO > Precourse Quiz 1 > Flashcards

Precourse Quiz 1 Flashcards

1
Q

What will auto start a DG?

A

UV or SI

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2
Q

How long does the DG have to be loaded on a bus?

A

10 seconds

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3
Q

What will trip a DG regardless of how it started?

A

Overspeed (660 rpm)
Generator differential current
Emergency Stop Pushbutton

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4
Q

What are the pressure trips on a DG in test mode?

A

Low lube oil pressure 30 psig
Low turbocharger oil pressure 30 psig
High crankcase pressure 0.5 psig

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5
Q

What is the design bases for the DG?

A

Loaded onto the bus in 10 seconds
7 days of fuel
If blackout in one unit, other unit DG can provide safe shutdown power for 4 hours

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6
Q

When do Fuel Oil XFR pumps starts?

A

Both start when DG >280 rpm
One starts when low tank level 14” above centerline

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7
Q

What will trip DG output breaker on UV start?

A

F Loss of field
U Underfrequency
R Reverse Power
N neutral overcurrent
D Gen Diff current
Overcurrent relay
S SAT feed BRKR lockout
E Stop PB

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8
Q

What will trip the DG output breaker on an SI start?

A

Differential current
Manual

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9
Q

After a DG start when does the CV pump sequence on?

A

0 seconds

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10
Q

Where are the DG sequencers powered from?

A

SARA DC 111
SARB DC 112
A sequencer timer AC 111
B sequencer timer AC 114

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11
Q

What are the DG ratings?

A

Continuous 5500 KW 954A
2000 hours 5935KW 1030A
2/24 6050KW 1050A

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12
Q

What is the difference between droop and isochronous mode on DG?

A

In iso mode governor maintains speed constant regardless of load
In droop speed lowers as load rises

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13
Q

What is the pressurizer heat-up limit?

A

100F/hr

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14
Q

What is the pressurizer cooldown limit?

A

200F/hr

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15
Q

What is the differential temperature limit between RCS and PZR spray?

A

320F

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16
Q

What is the capacity and lift setpoint of a pressurizer PORV?

A

RY456 210,000 lbm/hr 2335 psig
RY455A 210,000 lbm/hr 2345 psig

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17
Q

What is the capacity and lift setpoint of a pressurizer safety valve?

A

420,000 lbm/hr 2460 psig

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18
Q

What is the program level band for the pressurizer and what is it controlled by?

A

Unit 1 25-60% 557-587F Tave
Unit 2 27-60% 557-581F Tave
Constant mass: Level is designed to vary with RCS temperature (using auctioneered 2nd highest Tave) with no mass addition or loss
Controlled by charging and letdown flows

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19
Q

How many sets of pressurizer heaters are there?

A

4 sets,C proportional ABD backup

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20
Q

What is the capacity of the pressurizer heaters?

A

Proportional C 400KW
Backup ABD 1400KW

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21
Q

What are the power supplies for pressurizer heaters?

A

A&D 143
B&C 144

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22
Q

What allows the PORVs to operate once air is isolated to containment?

A

They have their own accumulators and each accumulator will allow its associated PORV to cycle 50 times

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23
Q

What are the pressurizer level setpoints?

A

92% PZR high level Rx trip 2/3
70% High level alarm
60% 100% program level
25/27% 0% power program level
17% PZR heaters de-energized
+5% >Band backup heaters energize regardless of level
-5% low level alarm

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24
Q

What is the hydrostatic test pressure for pressurizer?

A

3107 psig

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25
Q

What is the safety limit for the pressurizer?

A

2735 psig

26
Q

When do pressurizer safety valves open?

A

2460 psig

27
Q

What is the high pressure reactor trip setpoint?

A

2385 psig

28
Q

When will PORV RY455A be full open?

A

2345 psig

29
Q

When will PORV RY 456 be full open?

A

2335 psig

30
Q

When are the PORVs closed?

A

2315 psig

31
Q

When do the pzr spray valves full open?

A

2310 psig

32
Q

When do the pzr spray valves full close?

A

2260 psig

33
Q

At what pressure do the pzr variable heaters turn off?

A

2250 psig

34
Q

What is the RCS normal operating pressure?

A

2235 psig

35
Q

What pressure do the backup heaters turn off?

A

2225 psig

36
Q

What happens at 2220 psig?

A

backup heaters on and variable heaters full on

37
Q

At what pressure are the PORVs enabled?

A

2185 psig

38
Q

What pressure does a P-11 occur?

A

1930 psig

39
Q

What pressure will a PZR pressure low reactor trip occur?

A

1885 psig

40
Q

What pressure will safety injection occur?

A

1829 psig

41
Q

What is the effect of the controlling pressurizer level channel failing high/low?

A

Ovation chooses the 2nd highest of the 3 level detectors
If a level detector fails hi/low ovation will sense it and average the functioning 2 signals and work normally

42
Q

Per TS 3.4.9 what is required to make the pressurizer operable?

A

level <= 92%
Two groups of heaters each >150KW and able to be powered by redundant ESF buses

43
Q

What is the effect of the controlling pressure channel failing high/low?

A

Ovation chooses the 2nd highest reading pressure detector as master, if a detector fails high it is not the master.

44
Q

What chemicals are added to the RCS and why?

A

Hydrazine to scavenge O2
Lithium for pH
Hydrogen for scavenge O2
Hydrogen peroxide for crud burst
Zinc acetate for corrosion control and dose reduction
Boric Acid for reactivity control

45
Q

What are the interlocks to open an RCS cold leg loop stop valve?

A

Hot leg LSIV must be open
Bypass valve must be open
75+ gpm through bypass relief line for 5+ hours
WR T-hot within 20F of highest operating loop T-hot
WR T-cold within 20F of highest operating loop T-cold
control switch to open
Boron ppm>SDM requirementsd of unisolated portion of RCS

46
Q

What are the interlocks to open a hot leg loop LSIV?

A

Cold leg LSIV must be closed
Control switch to open
boron ppm > SDM requirements of unisolated portion of RCS

47
Q

After a DG start when does the SI pump sequence on?

A

5 seconds assuming there was an SI signal

48
Q

After a DG start, when does the RH pump start?

A

10 seconds assuming there was a SI signal

49
Q

After a DG start, when does the VC chiller sequence on?

A

15 seconds

50
Q

After a DG start when does the CC pump sequence on?

A

20 seconds

51
Q

After a DG start when does the SX pump and SX aux lube oil pump sequence on?

A

25 seconds

52
Q

After a DG start when does the A AF pump sequence on?

A

35 seconds

53
Q

After a DG start, when does the CS pump sequence on?

A

If there is a CS signal, 15-18 seconds then maintained at 40 seconds

54
Q

If the DG starts due to an ESF bus undervoltage, what mode will it start in? Will speed and voltage control be available to the operator?

A

During a UV it will start in Emergency Mode, speed and voltage will not be available since in isochronous mode

55
Q

If the DG is running and a loss of air occurs, what is the effect on the DG?

A

The only automatic trip available will be the overspeed trip

56
Q

When does the DG pre-lube pump start?

A

When DG is shutdown and speed <280 rpm, oil heaters cycle on at 120F

57
Q

When does the DG jacket water circulating pump start?

A

Pump and heaters cycle on/off when <280 rpm to maintain JW temp 120-130F

58
Q

What are the temperature trips on a DG in test mode?

A

Jacket water temp high 205F
Main bearing high temp 228F
Generator bearing high temp 228F
connecting rod bearing temp 197F

59
Q

What are the misc trips on a DG in test mode?

A

Engine overspeed 660rpm
EPB
Incomplete start sequence <280rpm @ 25+ seconds
Turbo charger thrust bearing failure 0.011in
SI signal

60
Q

What are the electrical trips on a DG in test mode?

A

FURNODS

loss of Field
Underfrequency
Reverse power
Neutral ground overcurrent
Overcurrent
Differential current
SAT breaker 1412 lockout

ILT SRO (20 decks)

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