Service AC System

Question 1

What does service AC system provide power to?

Answer 1

Normal lighting (non-vital ac)

Emergency lighting (vital ac and nv dc)

Misc plant loads

Question 2

If power is lost to emergency ac lighting what happens?

What happens when power is restored?

Answer 2

The emergency lighting detects loss of power to emergeny ac lighting and turns on emergency dc lighting

emergency ac lighting energizes, 5 second time delay keeps emergency dc lighting on (ac uses fluorescent bulbs), then de-energizes emergency dc lighting

Question 3

What happens in control room if you lose source of power to normal lighting (12D or 22E)?

The lose emergency lighting P.S. (1H or 2H)?

Answer 3

Half lights go out, still have emergency lighting providing power

Nothing, battery backed UPS powers emergency lighting

Question 4

Why does the pipe rack have its own UPS?

Answer 4

Give operators ability to perform manual actions during any fire scenario

Question 5

When do the battery powered DC lights illuminate?

Where are these lights typically located?

Answer 5

automatically turn on when a loss of their battery charge supply occurs

access / egress routes and operator manual actions stations