Circulating Water system

Question 1

Purpose of system

Answer 1

• supplies sufficient cooling water to the condensers to condense the turbine exhaust steam during all phases of plant operation.
• Additional flow for control of lake temperature

Question 2

Flow path

Answer 2

• Lake
• Traveling screens
• Cir Pumps A/B/C
• V6-50A/B/C (Discharge valve)
• Discharge Header
• Water boxes inlets (condenser)
• water boxes outlets (condenser)
• discharge cannel
• Lake

Question 3

Traveling screens
Spray water supplied by?
Power supply?

Answer 3

• Service water (SW)

- MCC-7 (intake)

Question 4

Cir Water Pumps A/B/C
Power supplies
Seal water can be provided by?

Answer 4

• 4Kv1,4,5

- Service water or U1 potable water (deepwell)

Question 5

Circ Water Pump Seal psi and flow rate required for start

Answer 5

• Must have 4psig and 10gpm to start pump.

- Will not trip pumps if already running and psi/Flow rate drop below this

Question 6

V6-50A/B/C
Circ Water pump Discharge Valve
Power supplies?
Interaction with pumps

Answer 6

• MCC-7 (intake)
• Opens 20% before associated pump will start, after pump is running the valve will fully open.
• Closes to 20% before associated pump will stop, then continue to fully close.
• Last pump to stop specials rules.

Question 7

Special rule for the last Cir Water stopping

Answer 7

-Pump stops immediately, associated valve stays fully open for 1.5 minutes and then travels fully closed.