The half-speed turbine in the field of nuclear power has been more and more widely used, the different speed will lead to differ in many respects. By calculating the 1000 MW-class nuclear power typically half-speed turbine enthalpy drop-type relative internal efficiency to discuss the half-speed machines heat economy; the same time, by calculating the half-speed machine last stage blades of the water droplets to study the relative speed of a half-speed machines water corrosion performance; and with the full-speed machine results were compared. The results showed that half-speed machines relative internal efficiency slightly higher than the full speed machine relative internal efficiency; from security point of view, especially in the prevention of water erosion of the performance, semi-fast machine is better than full-speed machine.
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