TACW

Question 1

What are the TACW pump auto starts?

Answer 1

• Low disch # at **
  155# (U1)
  145# (U2)

Question 2

What are the TACW Loads?

Answer 2

• Exciter Coolers
• Bus Duct Cooling
• H2 Coolers
• Stator Water Coolers
• Steam Packing Exhauster (U1)
• Gland Steam Condenser (U2)

Question 3

When do the TACW Inlet Valves to the Steam Packing Exhauster and Gland Steam Condenser (CMO-630/635) go closed??

Answer 3

• on an Extreme High Level

Question 4

Where does TACW fit in on the condensate system?

Answer 4

• TACW supply and return lines tap into the Condensate System between the HWP discharge and the Excess Flow Line to the CST

Question 5

What are the Auto action(s) that occur in the TACW Sys? (besides Pump auto start)?

Answer 5

• Steam Packing Exhauster and Gland Steam Condenser TACW Inlet valves close on an Extreme High Level

Question 6

During a Startup when is the TACW sys placed in service?

Answer 6

• Placed in service prior to drawing vacuum and placing steam seals in service

Question 7

With TACW in “Closed Cycle” is Cycle efficiency better or worse?

Answer 7

• Rejects heat to lake lowering cycle efficiency

Question 8

With TACW in “Open Cycle” is Cycle efficiency better or worse?

Answer 8

• Increases cycle efficiency

Question 9

What is TACW “Modified Open” cycle [Toad Cycle]?

Answer 9

• Open cycle with the TACW Hx
• Used to Reduce overall condensate temperatures
• Used up to 30% power to reduce overall condensate temperatures

Question 10

The Turbine Auxiliary Cooling Water System supply and return lines tap into the Condensate System between the:

A. Hotwell Pump discharge and the Excess Flow Line to the Condensate Storage Tank.

B. Excess Flow Line to the Condensate Storage Tank and the SJAE Condensers.

C. SJAE Condensers and the tap-off for the Turbine Exhaust Hood Sprays.

D. HWP recirc line and the CBP suction

Answer 10

A. HWP discharge and the Excess Flow Line to the CST.

Question 11

Describe the flowpath of the TACW Sys in “Closed Cycle”?

Answer 11

• One of two TACW pumps takes suction on the common return header and discharge through the TACW Heat Exchanger. The flowpath is then through the parallel loads into a common return header and back to the pump suction.

Question 12

Describe the flowpath of the TACW Sys in “Open Cycle”?

Answer 12

• TACW pump suction is supplied from the HWP discharge header through open cycle shutoff valve C-210.
  One of two TACW pumps discharge through Heat Exchanger Bypass Valve CMO-600 to the parallel loads.
  The flow exits the loads to a common return header and returns to the HWP Discharge Header through the Open Cycle Shutoff Valve C-249