Nuclear power valve technical requirements Nuclear power valve operating under the actual conditions, the technical characteristics of nuclear power valves and requirements higher than the thermal power valve. Nuclear valve technical requirements in addition to conventional valve technical requirements, but also give priority to consider the media impurity contamination, ambient temperature, operating temperature, humidity, radioactive, DC power and voltage fluctuations, the stability of the technology under earthquake and vibration conditions Requirements, safety level and more. â‘ Nuclear Power Valve Design a) Strength Design Nuclear power valve design, the strength calculation is essential. In addition to conventional strength calculation, finite element analysis and seismic calculation and analysis, for the nuclear safety level 1 valve, but also requires: a film stress limit calculation, a thin film stress + bending stress limit calculation, and the loop Kai - stop Cycle-plus-one-time stress change limit calculation, in addition to the loop start-stop condition plus a secondary stress of the limit of change, fatigue performance analysis. b) Structural Design Since most of the transmission medium in nuclear power system is radioactive and does not allow any leakage, it is especially important to design the sealing structure of the valve packing, bellows and valve seat in the structural design (the shape design of the valve body is regulated by ASME standard in). Abroad, the packing generally adopts the multiple seal structure, and the packing ring seal structure between the omega ring sealing structure and the packing layer is sandwiched with the disc spring. Bellows generally use a combination of bellows seal structure. For important high-pressure valve, the valve seat with forged structure. In addition, the valve body and pipe connections using butt or socket welded structure. More Keywords Search: Valve