GAS TURBINE ASSEMBLY FOR POWER PLANT WITH IMPROVED ROTOR AND TURBINE BLADES COOLING AND METHOD FOR OPERATING THIS GAS TURBINE ASSEMBLY

A gas turbine assembly for power plant, the gas turbine comprising: a rotor having an axis A; a compressor; a turbine; a rotor cover; a single annulus between the rotor and the rotor cover; wherein the single annulus is connected upstream to the compressor for being fed by air spilled from the compressor and downstream to a discharge lines for feeding the compressor air to the turbine.