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Improved analysis of anti-seismic structure of control valve in nuclear power plant

Release time: 2020-01-11

The basic function of automatic control valves has not changed over the past fifty years. It only improves the fixed basic performance, such as increasing the flow coefficient, reducing noise, reducing cavitation and improving flow characteristics. However, structural design characteristics are changing very slowly. It wasn't until the advent of nuclear power that valve manufacturers had to consider the effects of external forces such as earthquakes in valve design. This thesis discusses the improvement of control valves from the perspective of anti-seismic design; such as the selection of materials, the design of drive devices, structural assembly, and assembly of parts. Control valves for nuclear power plants must be able to withstand the effects of earthquakes. In fact, this is a necessary condition on a wide range of topics regarding the design, construction, and operation of the country's nuclear power plants in US federal regulations. 10CFFR50 is the code name for "Federal Equipment Production and Use Permit," and Appendix A lists the "General Design Standards for Nuclear Power Plants" (GDC). A paragraph in GDC-1 said: "Nuclear power plant structures, devices and components must be designed to withstand the effects of natural phenomena such as earthquakes, tornadoes, howling winds ...". Other GDCs can also be used as a reference for indicating the necessary conditions for equipment to resist earthquakes and dynamic restrictions. These include GDCs 1, 1, 4, 14, and 30.