Fire Water System

Question 1

Fire water system purpose?

Answer 1

• Provide an adequate water supply to appropriate fire protection systems.
• Provide reasonable assurance that a fire will not significantly increase the risk of radioactive release to the environment

Question 2

Water is supplied from? How?

Answer 2

• Lake water supplied by 3 pumps.

- Jockey/Motor Driven Fire pump/Engine Driven

Question 3

Set points for pumps?

Answer 3

• Jockey always on keeps 125psig in system
• Motor Driven starts at 100psig (+-5)
• Engine Driven starts at 90psig (+-5) 5 sec time delay

Question 4

Power supplies for pumps.

Answer 4

• Jockey MCC-7 (intake)
• Motor Driven 480V Bus 3
• Engine Driven has its own Diesel

Question 5

FP-10 and FP-1227 do what?

Answer 5

• Isolate U1 from U2

- Opened to supply water from one Unit to the other

Question 6

Pre-action Sprinkler system

Answer 6

• After an alarm is received off of both the A and B train for a zone, (or manually) pre-action valves open to deliver fire water to sprinkler heads.
• Will only discharge water if heat from fire has melted a sprinkler head.
• Zone 12 (Aux building 1st floor hallway)

Question 7

Wet pipe sprinkler system

Answer 7

-Water is already in lines to the sprinkler heads, requires only fire to melt heads to discharge water

Question 8

Dry-Pipe sprinkler system

Answer 8

• Water is not in pipes leading to sprinkler heads.
• Air pressure in the piping keeps the dry pipe valve clapper shut.
• Loss of air pressure will cause clapper valve to open, filling the system with water