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How to improve the control valve structure of earthquake-resistant nuclear power plantRelease Date: August 12, 2017
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.
Although nominal, such unspecified common standards are practically unenforceable. As the nuclear industry matures, the seismic design and analysis of nuclear power plant equipment will become clearer. These GDCs proposed by all industrial sectors have a place in today's seismic design control valve improvements. The Nuclear Energy Regulatory Commission (NRC) has issued "Standard Inspection Schemes" and "Standard Regulation Guidelines." Industrial organizations have also issued a series of regulations and standards called "NRC" required standards. Architects and public utilities have also begun to issue relevant regulations, which have clear requirements for standard adjustment guidance, standard inspection schemes and permit applications. At last. Control valve manufacturers have improved the product structure design in order to meet the industrial earthquake resistance restrictions.