SBOGS Flashcards
What is the purpose and design of the SBOGS
Provide an Alternate AC Source
within 1 hour of a Station black out
to any 1 of the Units for 16 Hours
How many units can be connected to the SBOGs at a time
Only 1
How can the SBOGs be aligned
PBA-S03 & PBB-S04
When do the SBOGs operate
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
What power ratings to the SBOGs provide
3400kw @ 13.8kv
How long do we have to start a SBOG
in the event of a LOP
1 Hour
How long do the SBOGs provide AAC for
16hours
What vital busses do we align the SBOGs to
PBA-S03
PBB-S04
What is the purpose of aligning the SBOGs to PBA-S03 & PBB-S04?
To provide power to the Class 1E Battery chargers
What will happen if offsite power is not expected to be returned within 1 hour
Align the SBOG to PBA-S03 (“A” Train)
can cope for up to 16hrs if a DG or offsite power has not been restored
What will happen if offsite power is not expected to be returned within 4 Hours
The Blackout coping strategy will be directed to a controlled cooldown to until Shutdown cooling conditions are restored
What will happen if offsite power is not expected to be returned within 8hrs
The blackout coping strategies will direct Spent pool cooling to be restored
What are the Operators actions during a SBO
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
During A LOOP what else may the SBOGs be aligned to
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
What kind of engine is the SBOGs
Heat engines that converts the chemical energy of the fuel into mechanical energy using air
What are the 4 principles of the Brayton Cycle
Compression, Combustion, Expansion, & Exhaust.
What is Pcd
Engine compressor discharge
What are the 6 major components of the SBOG Turbine Engine
1: Air inlet assembly
2: Air compressor assembly
3: Compressor Diffuser assembly
4: Combustor assembly
5: Turbine assembly
6: Exhaust assembly
Where would you take Engine compressor discharge (Pcd) readings
The enclosure Gauge panel
What is used to start the SBOGs
Diesel starting engine (Crank on / Crank off) Push buttons
Describe the Air inlet Assembly
Air is drawn into the compressor through a 3 stage filtration system (screen, filters, silencer)
Describe the Air compressor assembly
12 stage axial flow compressor
converts kinetic energy into pressure
What is Compressor surge
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
When is compressor surge more likely to happen
During start up & shut down
