COGENERATION NUCLEAR POWER GENERATION SYSTEM

PROBLEM TO BE SOLVED: To provide a cogeneration nuclear power generation system capable of absorbing variations of either a reactor heat output or a load and of enhancing thermal efficiency thereof.SOLUTION: A cogeneration nuclear power generation system 1 comprises: a boiling water reactor type nuclear power generation plant 2; a hot water producing device 17; and a controlling device 24. Steam generated in a reactor 3 rotates a high-pressure turbine 5 and a low-pressure turbine 6, and is condensed in a condenser 7. Cooling water discharged from the condenser 7 to a cooling water discharging pipe 10 flows into a hot water supplying pipe 18, and is heated to hot water at heaters 21A and 21B by steam extracted from each turbine in the hot water producing device 17. The controlling device 24 controls each opening degree of a flow control valve 19 disposed on the hot water supplying pipe 18, a flow control valve 23A disposed on a heating steam supplying pipe 22A and a flow control valve 23B disposed on a heating steam supplying pipe 22B based on a reactor heat output.