(EN) A GAS- AND STEAM-TURBINE PLANT (1) HAVING A WASTE-HEAT STEAM GENERATOR (4) WHICH IS CONNECTED DOWNSTREAM OF A GAS TURBINE ON THE FLUE-GAS SIDE AND WHOSE HEATING AREAS ARE CONNECTED IN THE WATER/ STEAM CIRCUIT (20) OF A STEAM TURBINE (21), IN WHICH GAS- AND STEAM- TURBINE PLANT (1) RELIABLE COOLING OF THE GAS TURBINE IS ENSURED EVEN UNDER VARIOUS OPERATING CONDITIONS, COMPRISES ACCORDING TO THE INVENTION A HEAT EXCHANGER (74) WHICH IS PROVIDED FOR COOLING THE COOLANT OF THE GAS TURBINE (6) AND IS CONNECTED ON THE SECONDARY SIDE IN A SEPARATE WATER/STEAM CIRCUIT (76) CONNECTED TO THE WATER/ STEAM CIRCUIT (20) OF THE STEAM TURBINE (21) IN SUCH A WAY THAT IT CAN BE SHUT OFF.FIGURE