CIRC WATER Flashcards
What are the CW Pump Trips?
Manual
Overload
Inst Overcurrent
UV on associated RCP Bus
What is the De-icing flowpath?
From a single unit discharge vault (WMO-16/26), through the de-ice tunnel and out the middle intake tunnel (WMO-30 is closed).
What are the indications of icing?
- Circulating Water temperature ≤ 35°F.
- Frazzle Ice
- > 1 Foot of drawdown in the Forebay not caused by starting a CW Pump
- Traveling screens high and/or extreme high differential pressure alarms are annunciating with little or no trash collection in the screen wash trash
What systems support the CW System?
- Chlorine Injection
- Miscellaneous Sealing and Cooling Water
- Screen Wash System
- Vacuum Priming
- 250v DC
What are the CW System loads?
- TACW Heat Exchanger
- Main Condensers
- Feed Pump Condensers
- Radiological Liquid Waste
- Turbine Room Sump- Overflow
What is necessary to meet T.S. 3.7.9, Ultimate Heat Sink?
UHS temperature limit of ≤ 86.9°F and the level should not fall below the level necessary for normal unit operation
When do the CW discharge valves auto open? Why?
With associated CW pump auto start to prevent pump run out
Will CW discharge valves auto open on a manual CW pump start?
No, you must manually open the CW outlet valves on a Manual CW Pump start. This prevents pump runout
When do the CW discharge valves auto close? Why?
On associated CW pump breaker opening. This prevents short cycling the system
When will a CW pump auto start?
On a failure of a running CW Pump, IF the control switch is in AUTO
(Running CW control switch in Run with the breaker open)
What are the CW pump power supplies?
- 1D(2D) = CW Pump #11(21)
- 1A(2A) = CW Pump #12(22)
- 1B(2B) = CW Pump #13(23)
- 2C = CW Pump #24
What are the Circ Water discharge crosstie loads?
NESW
Chlorine Injection
Misc Sealing Cooling Water
Lawn Sprinkler System
If there is damage to the intake piping, how can we get water to the ESW pumps?
Via WMO-17/27, Circ Water Forebay Emergency Intake Shutoff Valves
What is the safety related function of Circ Water System?
Provide water source to ESW
