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ATR SRO Level of Knowledge > Emergency Diesel Generator M-6 > Flashcards

Emergency Diesel Generator M-6 Flashcards

TRA00107

1
Q

What is the purpose of the M-6 Diesel Generator?

A

Automatically start and supplies emergency power to 670-E-3 Diesel Bus and/or TRA-609 Commercial/Diesel bus upon loss of power.

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2
Q

What defines operability for M-6 Diesel Generator?

A

674-M-6 diesel generator is considered operable when it:
1. Aligns to automatically start and load within 20 seconds to energize 670-E-3 bus following a loss of diesel OR commercial power (SAR-153)

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3
Q

What are the supply voltages from M-6 to its designated loads?

A
  1. 4160V to E-3
  2. 2400V to TRA-609
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4
Q

What is the backup for M-6 emergency diesel generator?

A

670-M-43 is normally available for manual start to back up 674-M-6

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5
Q

What is the alternate electrical configuration for 674-M-6?

A

670-M-43 continuously running and supplying E-3
Auto start dg 674-M-6 standby and available
Commercial power supplied to E-1 and E-2 4160V Buses

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6
Q

What is the normal electrical configuration for M-6?

A

In normal configuration, comm power supplies all facility loads and the 480V Diesel Bus UPS supplies critical loads and ECP M-10 for 30 minutes on loss of commercial power.

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7
Q

Where are the M-6 emergency diesel control panels E-118/E-119 located?

A

Located in the 1st basement switchgear room.

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8
Q

What critical loads are powered by 670-E-3 diesel bus?

A

Supplies power to 200 hp utility cooling water pumps M-5 and M-6
Supplies to 480V diesel bus E-9 through the 480V Diesel UPS

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9
Q

What portions of the M-6 distribution system are safety-related?

A

The 4160V diesel bus E-3
Portions of the 480V Diesel Bus BBP System
480V diesel bus E-9
480V diesl/comm bus E-15
Auto Transfer Switch E-228

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10
Q

How does 674-M-6 auto-start UV circuitry work?

A

TRA-609 UV relays for TRA-609 breakers 52-1 and 52-2
Relays sense normal voltage at 623-E-101 A and B for TRA-623 2400V switchgear.
If power is interrupted and drops to 70% or less of nominal voltage, the UV relays in 609 de-energize and M-6 starts.
Will supply power within 20 seconds to TRA-609 commercial bus

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11
Q

Which breaker closes in to power from M-6 on loss of commercial power supply?

A

609-52-2 breaker closes on auto-start

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12
Q

Describe auto-transfer switch operation on an auto-start of M-6 from loss of commercial power.

A
  1. M-6 starts
  2. Within 20 seconds, reaches rated voltage and frequency
  3. 0 seconds - ATS-1 (basement of 604) switches to standby bus
  4. 2 seconds - Standby feeder breaker 2 (TRA-609) closes
  5. 4 seconds - ATS-3 (TRA-605) switches
  6. 6 seconds - ATS-4 (TRA-619) switches
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13
Q

Acronym for Utility Area ATS function on auto-start of M-6 from loss of commercial power?

A

S - Security 604 (0 seconds)
A - Air 609 (2 seconds)
W - Waste 605 (4 seconds)
W - Water 619 (6 seconds)

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14
Q

What are the three fission product barriers per SAR-153?

A
  1. Fuel Cladding
  2. PCS
  3. Confinement
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15
Q

Which diesels at ATR are directly safety-related?

A

Only M-6 is safety-related.

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16
Q

What are the possible configurations for M-6/M-43/Commercial power?

A
  1. Commercial power feeding, M-6 in standby. (startup and operation)
  2. M-43 power feeding, M-6 in standby. (alt startup and operation)
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17
Q

Give cooling water capacity for M-6 EDG.

A

233L

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18
Q

Give lubricating oil capacity for M-6 EDG.

A

401.3L

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19
Q

What is the operating speed for M-6 EDG?

A

1800 RPM

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20
Q

What is the power and voltage rating for M-6 EDG?

A

1500 kW / 4160V

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21
Q

Describe M-6 EDG Support Equipment load alignment.

A

674-E-1 480V MCC fed from 670-E-15:
1. Radiator fan motor
2. Jacket water heaters
3. Lube oil heater
4. Unit heaters
5. Cooling fans
674-E-3 480V MCC fed from 674-E-2:
1. Day tank FOP
2. Lighting
3. Fire detection
4. Vent fan and damper
5. Intake air louvre damper actuator
6. Alarm feed
7. Fuel oil cooler

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22
Q

Draw M-6 EDG Support electrical distribution one-line

A
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23
Q

Describe M-6 EDG Exhaust operation.

A

Dampers open when fans start
674-M-15 (4000 CFM fan) starts at 85F room temp

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24
Q

Describe M-6 EDG supply fan (674-M-13/14) operation.

A

20000CFM fans
One starts at 90F
Second starts at 95F

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25
Q

Describe operation of M-6 EDG building louvres.

A

Two intake louvres.
North louvre opens when either 20k CFM fan starts
Both louvres open on a start signal for EDG

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26
Q

Describe M-6 EDG Start Air System

A

HP air from ATR at 285 psig to 674-M-10 receiver.
M-10 relieves at 300 psig
Plant air can be used if HP air is lost.
Capacity for four 10-second attempts to start
Can start as low as 120 psig
Low pressure alar at 150 psig

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27
Q

What is the function of the M-6 EDG governor?

A

Mechanical actuator maintains constant engine speed regardless of load.

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28
Q

Draw power supply alignment for M-6/M-43 EDG electronic governors.

A
29
Q

What are the two power sources for M-6 EDG electronic governor?

A

Either from Utility UPS E-115 or Instrument UPS E-117

30
Q

What fluid is the M-6 EDG jacket water?

A

Antifreeze/water mixture

31
Q

Normal setting for M-6 jacket water temp?

A

135F

32
Q

Describe operation of the M-6 EDG Engine Oil Heater.

A

Lube oil and jacket water heaters turned off when engine starts by pressure switch at 10 psig
Heater turned on when oil pressure drops below 5 psig

33
Q

How is heat removed from M-6 EDG jacket water?

A

674-M-8 fan and radiator (east side of TRA-674).
Radiator fan starts by run relay in engine control panel

34
Q

Draw the M-6 EDG Diesel Oil System.

A
35
Q

How is M-6 diesel oil filtered?

A

F.O. delivered through duplex filter to oil manifold.

36
Q

What is the consumption rate for F.O. for M-43 when at normal and full load?

A

M-43 requires:
0.5 GPM at normal load
1.7 GPM at full load

37
Q

Describe the F.O. pump for M-6 EDG?

A

Gear type PDP
10 GPM at 35 PSIG

38
Q

Describe the operation of the M-6 EDG fuel oil manifold.

A

Manifold provides suction to 8 Fuel Injection Pumps.
3000 psig from injection pumps to nozzles
Low header pressure alarm at 15 psig
Manifold maintained at 20 to 30 psig by back pressure relief
Returns oil to day tank

39
Q

Draw the M-6/M-43 fuel oil reservoir system.

A
40
Q

What is the capacity of the M-6/M-43 Shared Day Tank?

A

1500 Gallons

41
Q

What are the capacities of the M-6 and M-43 individual day tanks?

A

275 Gallons

42
Q

What are the capacities for the above-ground diesel fuel storage tanks?

A

TRA-1712A/B hold 8000/6000 gallons respectively.

43
Q

Where is the Shared M-6/M-43 day tank located?

A

Buried immediately north of the ATR building in the containment vault in concrete.

44
Q

Give level alarm setpoints for M-6/M-43 shared day tank.

A

High alarm at 86.5%
Low alarm at 30.9%

45
Q

For what time period can the Fuel Oil Day Tank TRA-776 supply with no makeup at normal load?

A

3 hours and 20 minutes of run time

46
Q

What is the duration for the diesel F.O. supply system usable capacity?

A

Sufficient fuel for at least 10 days of continuous operation of M-43 OR M-6 at 0.8 GPM fuel usage. (does not include the 1500 gallon day tank capacity)

47
Q

What is the basis for the minimum duration of diesel F.O. supply capacity?

A

10 days of continuous operation are predicated upon:
7 days of usable fuel to minimize refueling efforts
3 days of usable fuel to allow for delay in delivery

48
Q

Describe 674-M-9 275 gal M-6 F.O. Day Tank operation.

A

Located in SE corner of 674.
10 GPM transfer pump pumps from TRA-776 to 674-M-9.
Starts xfr pump when day tank at 3/4 full
Stops xfr pump at full
Alarm at 1/4 full

49
Q

What is the fuel consumption rate for M-6 EDG?

A

1.5 GPM at full load
0.8 GPM at normal load (50%)

50
Q

Describe the M-6 EDG L.O. system operation.

A

65 gallon pan
Normal pressure of 60 psig
Pump flow rate 90 GPM

51
Q

What are the three positions for the M-6 Transfer Priority Selector Switch?

A
  1. ALL (Normal)
  2. BLDG 609
  3. GEN BUS
52
Q

Describe M-6 TPS Switch ALL Mode Operation

A

M-6 EDG picks up any bus that loses power
If both buses lose power, M-6 will pick up both buses
If one bus loses power while the other is supplied by diesel, M-6 will pick up that bus in conjunction with the current one.

53
Q

Describe M-6 TPS Switch BLDG 609 Mode Operation

A

LOSS OF UTILITY AREA COMM POWER:
1. M-6 EDG will supply power to utility area commercial/diesel bus
2. Upon return of comm power and bkr 52-1 is opened allowing M-6 EDG to go into cooldown cycle
3. If 670-E-3 loses power while M-6 EDG is carrying 609, M-6 will NOT pick up ATR diesel bus
LOSS OF ATR 4160V E-3:
1. M-6 EDG will supply E-3
2. If power lost to 609 comm bus, M-6 EDG will DROP E-3 and pick up 609

54
Q

Describe M-6 TPS Switch GEN BUS Mode Operation

A

LOSS OF ATR 4160V E-3
1. M-6 EDG automatically starts and load E-3
2. Upon return of comm power, parallel comm with M-6 and transfer load
3. Shutdown
4. Engine goes into 5 minute cooldown then stops
5. If comm power lost to 2400V switchgear in 609 while M-6 EDG is supplying E-3, 609 will remain energized
LOSS OF UTILITY AREA COMM POWER:
1. Gen will supply power to the utility area comm/diesel bus
2. Upon return of comm power, M-6 EDG will automatically go into 5-minute cooldown/shutdown cycle
3. If power lost to E-3 while M-6 is carrying utility load, M-6 will drop utility and pick up E-3.

55
Q

Describe operation of the M-6 EDG Master Manual-Auto Control Switch.

A

In AUTO:
1. 52-G M-6 output bkr
2. 52-25 Feeder to E-3
3. 52-2 feeder to 609
All automatically operate
In MAN:
Loss of power would still result in M-6 starting, however 52-G would not close in to provide power to E-3 or 609

56
Q

Describe the M-6 DG Starting Sequence

A
  1. Run Relay starts Radiator Fan and Open Louvres
  2. Crank Cycle Timer allows engine crank for 10 seconds/off for 15 seconds and repeat up to 85 seconds (at which point overcrank alarm would actuate)
  3. Once engine reaches 10% rated speed, crank termination relay and oil pressure timer pick up
  4. Governor and voltage reg bring engine up to rated V/F
  5. 52-G ready to be closed
57
Q

Give M-6 EDG Trips.

A

Overspeed SD
Overcrank SD
Reverse Power SD
Reverse VARS SD
Gen Ground OC SD
Gen Neg Sequence OC SD
Gen OC SD
Gen Diff OC SD
Low L.O. Pressure SD
High Water Temp SD
High L.O. Temp SD

58
Q

What is the M-6 EDG Overspeed Trip Setpoint?

A

2125 GPM

59
Q

What is the M-6 EDG Overcrank Timer Trip Setpoint?

A

85 seconds

60
Q

What is the M-6 EDG Reverse Power Trip Setpoint?

A

100W, 2-sec TD

61
Q

What is the M-6 EDG Reverse VARS Trip Setpoint?

A

100VA, 2-sec TD

62
Q

What is the M-6 EDG Gen Ground OC Trip Setpoint?

A

20A, 24 cycles

63
Q

What is the M-6 EDG Gen Neg Sequence OC Trip Setpoint?

A

4A, 1.0 time curve

64
Q

What is the M-6 EDG Gen OC Trip Setpoint?

A

3A, 42V instantaneous, Inhibit 80, Time 20

65
Q

What is the M-6 EDG Gen Diff OC Trip Setpoint?

A

0.30 pickup amps

66
Q

What is the M-6 Low Lube Oil Pressure Trip setpoint?

A

20 psig

67
Q

What is the M-6 EDG High water Temp Trip Setpoint?

A

220F

68
Q

What is the M-6 EDG High Lube Oil Temp Trip Setpoint?

A

250F

69
Q

How do you reset an overspeed condition on the M-6 EDG?

A

Reset overspeed trip on engine.
Reset air shut off SOV on engine.
Depress reset alarm and shutdown PB on E-118
Reset Gen Fault Lockout Relay on E-118

ATR SRO Level of Knowledge (13 decks)

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