CO2 TURBINE POWER GENERATION SYSTEM

The invention provides a CO turbine power generation system that can be easily prevented from reaching an overspeed condition. A CO turbine power generation system of an embodiment includes a CO medium shutoff valve installed in a medium flow path between a regenerative heat exchanger and a combustor. When load rejection is to be performed, the CO medium shutoff valve closes to shut off the supply of the medium from the regenerative heat exchanger to the combustor.