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The paper presents the results of the numerical analyses for the steam turbine rotor, dedicated for the newly-designed 900 MW steam unit with supercritical steam parameters (650 o C, 30.0 MPa). Basing on the design calculations, an optimal design solution was determined. Review of the available literature on materials for turbine rotors with supercritical steam parameters was done. Then the start-ups of the turbine were simulated. Thermal and strength states were analyzed. As a result, an optimal start-up characteristic was obtained. Nomenclature m/mo -turbine feed steam mass flow to the nominal steam mass flow ratio n -number of stage, rotor revolutions p -live steam pressure R0.2 -yield stress t -time T -live steam temperatureGreek symbols σ -stress