Patent ID: 8526562

Claim:
A generation system comprising: a natural circulation reactor adapted to generate steam only by naturally circulating coolant internally within said natural circulation reactor without a pump being disposed within said natural circulation reactor; a high-pressure turbine connected to said natural circulation reactor by a main steam pipe configured to at least introduce steam generated in said natural circulation reactor to said high-pressure turbine, said main steam pipe having one end connected to said natural circulation reactor and another end connected to said high-pressure turbine; a low-pressure turbine configured to receive steam exhausted from said high-pressure turbine; a moisture separation heater installed between said high-pressure turbine and said low-pressure turbine and configured to at least receive steam exhausted from said high-pressure turbine; a first steam control valve installed in said main steam pipe at a position between the one end of the main steam pipe connected to said natural circulation reactor and the another end of said main steam pipe connected to said high-pressure turbine; an inlet pipe having a second steam control valve installed in said inlet pipe, said inlet pipe having one end of said inlet pipe connected to said main steam pipe at a position between said natural circulation reactor and said first steam control valve installed in said main steam pipe, and said inlet pipe having another end of said inlet pipe connected to said moisture separation heater, said second steam control value being installed at a position between the one end of said inlet pipe connected to said main steam pipe and the another end of said inlet pipe connected to said moisture separation heater; a control rod drive apparatus connected with a control rod configured to be inserted and withdrawn with respect to a core of said natural circulation reactor; a power control apparatus adapted to output a power adjustment demand signal and a control rod drive command signal based on a reactor power detected by a reactor power detector configured to detect reactor power; a control rod drive control apparatus adapted to control said control rod drive apparatus based on said control rod drive command signal; and a pressure control apparatus adapted to control a pressure of said natural circulation reactor; wherein said pressure control apparatus is adapted to control a degree of opening of said second steam control valve installed in said inlet pipe based on said power adjustment demand signal, and is adapted to control a degree of opening of said first steam control valve installed in said main steam pipe jointly in accordance with control of the degree of the opening of said second steam control valve installed in said inlet pipe; whereby the steam is generated in said natural circulation reactor only by the natural circulation of the coolant internally within said natural circulation reactor without a pump being disposed within said natural circulation reactor.