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Systems > SBOGS > Flashcards

SBOGS Flashcards

1
Q

What is the purpose and design of the SBOGS

A

Provide an Alternate AC Source
within 1 hour of a Station black out
to any 1 of the Units for 16 Hours

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2
Q

How many units can be connected to the SBOGs at a time

A

Only 1

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3
Q

How can the SBOGs be aligned

A

PBA-S03 & PBB-S04

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4
Q

When do the SBOGs operate

A

1 A station black out
2 at the operators discretion during a LOOP
3 A loss of power to the MCC (M73) providing power to the SBOGs control system
4 During system testing

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5
Q

What power ratings to the SBOGs provide

A

3400kw @ 13.8kv

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6
Q

How long do we have to start a SBOG
in the event of a LOP

A

1 Hour

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7
Q

How long do the SBOGs provide AAC for

A

16hours

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8
Q

What vital busses do we align the SBOGs to

A

PBA-S03
PBB-S04

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9
Q

What is the purpose of aligning the SBOGs to PBA-S03 & PBB-S04?

A

To provide power to the Class 1E Battery chargers

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10
Q

What will happen if offsite power is not expected to be returned within 1 hour

A

Align the SBOG to PBA-S03 (“A” Train)
can cope for up to 16hrs if a DG or offsite power has not been restored

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11
Q

What will happen if offsite power is not expected to be returned within 4 Hours

A

The Blackout coping strategy will be directed to a controlled cooldown to until Shutdown cooling conditions are restored

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12
Q

What will happen if offsite power is not expected to be returned within 8hrs

A

The blackout coping strategies will direct Spent pool cooling to be restored

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13
Q

What are the Operators actions during a SBO

A

Establish a source of AC power to 1 train of the plants 4160v class busses
Maintain single phase natural circulation for as long as possible while restoring efforts are in place

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14
Q

During A LOOP what else may the SBOGs be aligned to

A

NAN-S05 ( to power switchyard loads. Unit 1 Only)
NAN-S06 then NGN-L13 & to the EF Battery charger to supply power to NKN-M45

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15
Q

What kind of engine is the SBOGs

A

Heat engines that converts the chemical energy of the fuel into mechanical energy using air

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16
Q

What are the 4 principles of the Brayton Cycle

A

Compression, Combustion, Expansion, & Exhaust.

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17
Q

What is Pcd

A

Engine compressor discharge

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18
Q

What are the 6 major components of the SBOG Turbine Engine

A

1: Air inlet assembly
2: Air compressor assembly
3: Compressor Diffuser assembly
4: Combustor assembly
5: Turbine assembly
6: Exhaust assembly

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19
Q

Where would you take Engine compressor discharge (Pcd) readings

A

The enclosure Gauge panel

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20
Q

What is used to start the SBOGs

A

Diesel starting engine (Crank on / Crank off) Push buttons

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21
Q

Describe the Air inlet Assembly

A

Air is drawn into the compressor through a 3 stage filtration system (screen, filters, silencer)

22
Q

Describe the Air compressor assembly

A

12 stage axial flow compressor
converts kinetic energy into pressure

23
Q

What is Compressor surge

A

when the forward stages of the compressor create more pressure that the aft stages can handle. If bad enough it could cause the air may flow backwards through the compressor

24
Q

When is compressor surge more likely to happen

A

During start up & shut down

25
Q

How is compressor surge avoided

A

Variable guide vanes
Bleed air valve

26
Q

How are Variable guide vanes (VGVs) Used

A

Vane blade angles are realigned to maintain a balanced flow

27
Q

Describe the bleed air valves

A

Directs excess air from the compressor to the Turbine exhaust stream (Also used to control the T5 temperature)

28
Q

Describe the Compressor diffuser Assembly

A

A casing located aft of the compressor
25% (primary air)of the air is mixed with fuel for combustion
the other 75% (secondary air) is used to cool combustion gasses

29
Q

What is the T5 temp

A

temp of the hot compustion gasses in the 3rd stage turbine rotor

30
Q

Why is T5 temp so important

A

it is the primary indicator of engine loading

31
Q

What causes T5 temp to increase

A

Generator loading

32
Q

What happens if the T5 limit is reached

A

the control system will restrict fuel flow

33
Q

when will the T5 temp cause an alarm

A

if the temp is greater than 1340f for 10 seconds

34
Q

When will the T5 temp trip the SBOG

A

the temp is greater that 1340 for 20 seconds

35
Q

Where is the T5 temp displayed

A

HMI Screens

36
Q

How many Fuel injectors are there on the SBOGs & where are they located

A

12
Around the combustion chamber and protrude inside

37
Q

What is each fuel injector supplied with

A

An air assist connection. which helps atomize the fuel

38
Q

How is the combustion process started

A

Compressed air & atomized fuel mixture is ignited with an igniter torch

39
Q

when is the Ignitor torch turned off

A

when the engine becomes self sustaining (66% engine speed)

40
Q

How many stages is the SBOG Turbine

A

3 Stages ( Rotor, Blades, Nozzles)

41
Q

What is P2 pressure

A

pressure of the air exiting the engine compressor diffuser section

42
Q

What does a higher Pcd mean

A

more fuel can be mixed to increase power

43
Q

What else does Pcd indicate

A

Cleanliness and condition of the engine compressor

44
Q

How is Pcd monitored

A

On the HMI Screens

45
Q

How is the Turbine output shaft speed reduced

A

Reduction gear unit

46
Q

What is the Reduction gear units peed designed for

A

1800 rpm for 60hz

47
Q

What is the turbine speed

A

14,951 rpm

48
Q

How is the SBOG generator used

A

to convert mechanical energy to electrical energy via Electromagnetic induction

49
Q

How many phases is the SBOGs generator

A

3 phase AC

50
Q

What is the SBOG generator output rated for

A

14.2kv and 4270 kw

51
Q

what is the lagging power factor

A

0.8

Systems (10 decks)

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