Circ Water Flashcards

1
Q

What is the De-icing flowpath?

A
  • From a single unit discharge vault (WMO-16 or -26), through the de-ice tunnel and out the middle intake tunnel (WMO-30 is closed).
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2
Q

What are the indications of icing?

A
  • 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
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3
Q

What systems support the CW System?

A
  • Chlorine Injection
  • Miscellaneous Sealing and Cooling Water
  • Screen Wash System
  • Vacuum Priming
  • 250v DC
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4
Q

What are the CW System loads?

A
  • NESW
  • Chlorine Injection (x-tie header)
  • Miscellaneous Sealing
    Cooling Water (x-tie header)
  • Lawn Sprinkler System (x-tie header)
  • TACW Heat Exchanger
  • Main Condensers
  • Feed Pump Condensers
  • Radiological Liquid Waste
  • Turbine Room Sump
  • Overflow
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5
Q

When do the CW outlet valves auto open?

A
  • They auto open with associated CW pump auto start to prevent pump runnout
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6
Q

Will CW outlet valves auto open on a manual CW pump start?

A
  • No, you must manually open the CW outlet valves on a Manual CW Pump start. This prevents pump runout
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7
Q

When do the CW outlet valves auto close?

A
  • Auto close on associated CW pump breaker opening. - Prevents short cycling the system
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8
Q

When will a CW pump auto start?

A
  • With the CR Switch in Auto, the CW Pump will auto start on a failure of a running CW Pump. (Running CW control switch in Run with the breaker open.)
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