The relationship between effects of reheat steam turbine’s performance degradation upon power and heat rate has been established

and method of powercorrecting calculation for performance degradation being given. When assuming the degradation degree of the intermediate pressure cylinder to be one half of that of the high pressure cylinder

and adopting low pressure cylinder’s degradation degree given by ASME PTC 6 Report1985 to be one half of that of the intermediate pressure cylinder

it is found from calculation for different load conditions and different units that the powercorrecting coeffidient of reheat steam turbine’s performance degradation to be about1.31 times of that for its heat rate.