The design and impact factors of steam bypass control valve for nuclear power station

If power of reactor doesn't match load of turbine generator, steam bypass system (GCTc) well discharge the main steam into condenser and deaerator in a controlled mode for avoiding nuclear steam supply system overpressure. According to configuration of deaerator and characteristics of diffuser, parameters and capacity of turbine bypass valves is designed for the requirement above and the followings: no overpressure problems for deaerator, safety for diffuser and maximum discharge capacity limitation for single turbine bypass valve. A detailed design about steam bypass control valves for Hongyanhe Nuclear Power Station Phase I project is described in this paper, related content for this issue can be used as a reference for turbine bypass valves design of subsequent CPR 1000 nuclear power station project. (authors)