The DN800 nuclear secondary steam isolation valve independently developed, designed and manufactured by China Nuclear Su Valve Technology Industrial Co., Ltd. (hereinafter referred to as China Nuclear Technology Co., Ltd.) successfully passed the prototype appraisal organized by the National Nuclear Safety Administration. This means that CNNC has fully mastered the design, manufacturing, testing and functional testing technology of the nuclear secondary main steam isolation valve, and has the ability to independently develop and manufacture the main steam isolation valve, which can be mass-produced. The smooth development of DN800 nuclear secondary steam isolation valve ensures that the parameters meet the requirements of the main steam isolation valve of the existing PWR nuclear power plant, and also covers the third-generation nuclear power technical requirements, achieving a major breakthrough in the localization of nuclear power valves in China. It has created favorable conditions for the complete localization of China's nuclear power projects. Among them, the seismic test results of the prototype have reached the world advanced level of the development technology of similar large-scale valves.
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