R27 - AC Distribution Flashcards
How many power sources are required during mode 1?
2 offsite
3 diesels
Div 1 and 2 LSS
Div 3 not required if HPCS is INOP
What is the normal and back-up power for site power loop?
Normal - 29UD through BOP 24
Backup - construction power
What are the immediate operator actions for LOSS of ESF AC Power?
- LOP to BUS - ensure bus re-energizes using hard cards
- Incoming feeder breaker TRIP - 15AA is re-energized, verify NO valid containment isolation and open 1P53-F001 Instrument Air to CTMT
What type of transfer device is T01, T02, and T03?
Automatic normal seeking bus transfer switch
What happens if normal power is lost to T01, T02, T03?
What happens if normal power is restored?
Auto swap to alternate
Auto swap back
What is T03 normal and backup source?
Normal - ESF 12
backup - Construction power
What transformer does T03 go through?
T3
What is normal and emergency source to T01?
normal - 16AB
Backup - T03
What transformer does T01 go through?
T1
What is the maximum time breakers J5228 and J5232 can be opened and why?
30 minutes to avoid stressing the voltage dividing capacitors in the breakers?
What type of power transfer is 13R bus? why?
Dead BUS transfer to prevent OVERLOAD on the TRANSFORMER
What AC sources are required when shutdown?
1 offsite
1 diesel for Div 1 or Div 2
1 circuit not mentioned above (an extra)
What is the only disconnect that can be operated under a load?
J3885 for ESF 12
What are the device numbers with definitions?
27 - undervoltage 42 - running circuit breaker 49 - thermal overload 50 - instant overcurrent 51 - time overcurrent 52 - AC circuit breaker 72 - DC circuit breaker 74 - Alarm relay 86 - Lock out relay 87 - Differential protective relay 89 - disconnect
