Combined cycle power plant with steam cooled gas turbine

In a combined cycle power plant which comprises a combination of a gas turbine plant and a steam turbine plant, includes an exhaust heat recovery boiler for generating steam turbine driving steam by utilizing exhaust heat from a gas turbine, and a steam cooling system for cooling a high temperature cooled area of the gas turbine with steam, and causes overheated steam from the steam cooling system to be recovered by a steam turbine, the steam turbine plant including at least a high pressure turbine and a low pressure turbine, the improvement comprising:

• a first conduit for guiding exhaust from the high pressure turbine to the steam cooling system, a second conduit for guiding exhaust from the high pressure turbine to an inlet of a reheater of the exhaust heat recovery boiler, a third conduit for guiding exhaust from the high pressure turbine to an inlet of a downstream turbine, and a fourth conduit for guiding outlet steam from the steam cooling system to an intermediate position of the reheater.