TACW Flashcards
What will auto start TACW pumps?
Low disch # at
- 155# (U1)
- 145# (U2)
What are the TACW pump trips?
- Load Con
- Load Shed
- Overload/Overcurrent
What are the TACW Loads?
- Exciter Coolers
- Bus Duct Cooling
- H2 Coolers
- Stator Water Coolers
- Steam Packing Exhauster (U1)
- Gland Steam Condenser (U2)
What are the power supplies for the TACW Pumps?
- 11/21 A
- 11/21 B
BOTH Train B
When do the TACW Inlet Valves to the Steam Packing Exhauster and Gland Steam Condenser (CMO-630/635) go closed??
On an Extreme High Level
Where does TACW fit in on the condensate system?
TACW supply and return lines tap into the Condensate System between the Hotwell Pump discharge and the Excess Flow Line to the CST
What is TACW cooled by?
Circ Water in the TACW HX tubes
During a Startup when is the TACW system placed in service?
Prior to drawing vacuum and placing steam seals in service
Above what temperature must TACW be in “Closed Cycle”?
TACW from Hotwell temps
Greater than 95°F (U1)
Greater than 104°F (U2)
With TACW in “Closed Cycle” is Cycle efficiency better or worse?
Lower cycle efficiency bc heat is rejected to the lake via the Hx
With TACW in “Open Cycle” is Cycle efficiency better or worse?
Better efficiency
What is TACW “Modified Open” cycle [Toad Cycle]?
- Open cycle with the TACW Hx
- Used up to 30% power to reduce overall condensate temperatures
Describe the flowpath of the TACW System in “Closed Cycle”?
TACW pumps takes suction on the common return header and discharge through the TACW Hx. The flowpath is then thru parallel loads into a common return header and back to the pump suction. CMO-600 is throttled as needed for temperature control.
Describe the flowpath of the TACW System in “Open Cycle”?
TACW pump suction is supplied from the HWP discharge header through open cycle shutoff valve. TACW pump discharges thru 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.
How is makeup water supplied when in “Closed Cycle”?
Via a small bypass line around the open cycle shutoff valve C-210
