some mix of motor-driven, diesel-driven, and turbine-driven to ensure redundancy. A turbine-driven auxiliary feedwater pump is powered by steam generated by the decay heat removal from the secondary side steam circuit of the plant. The typical steam turbine used in the auxiliary feedwater systems are the "solid wheel" or "water wheel" Terry Steam Turbines manufactured by the Curtiss-Wright Corporation in Summerville, SC.

In contrast to emergency core cooling systems