Station Lighting - .5

Question 1

What happens to station lighting during a LOP?

Answer 1

1. Standby lighting batteries can last for at least 1 hour during a LOP.
2. Essential lighting busses will be reenergized when the EDG starts up (Non-1E bkr does not trip when power is lost).
3. Standby self contained battery unit lights are good for 8 hours.
4. Normal lighting loses power when power to non-1e busses is lost.

Question 2

What happens to station lighting during a LOCA?

Answer 2

In a LOCA, the non-1e bus to which the essential lighting system is connected will be automatically switched off by tripping their isolating devices and must be re-energized manually.

Question 3

What are the components of Standby Lighting?

Answer 3

• Stairwells, DW, and exit signs.
• 125VDC system provides normal power to the standby lighting inverters.
• During a LOP, batteries are able to supply power for four hours.

Question 4

What components are considered Normal lighting?

Answer 4

• Non 1E
• Exit signs and corridors lit by 8 hour self contained battery.

Question 5

What components are considered Essential Lighting?

Answer 5

• Safety related areas.
• Transfer switch connects Non-1E to 1E bus.
• Stays in service during a LOP.
• LOCA load shed.