non-class 1E AC power.

Question 1

what is the purpose of the non 1E AC power system and what voltages are distributed?

Answer 1

provide a realiable source of power for non-safety related plant auxiliary loads.
* 7.2KV
* 4.16KV
* 480VAC
* 208/120VAC

Question 2

what happens if a flashing 4160V 1E breaker is pressed?

Answer 2

it will go solid and prevent the diesel from loading to that bus.

Question 3

what are SLP 1 & 2 used for?

Answer 3

lighting & switching.

Question 4

what are SLP 3 & 4 used for?

Answer 4

the ring bus.

Question 5

what happens upon a loss of power (normal AC) to UPS?

Answer 5

alternate DC is selected, then backup AC is the last option.

Question 6

what are the non-1E AC loads?

Answer 6

• NSSS computer
• security system
• PA system
• standby lighting
• BOP computer

Question 7

what causes a station service transformer lockout?

Answer 7

• any breaker supplied from the transformer is tripped and their closing circuit is blocked
• the alternate bus power supply breaker is closed and automatic transfer is blocked
• transformer cooling fans and oil pumps stopped
• the 13.8KV bus section is isolated