Research on non-destructive Helium pressure of TVS-2M fuel rods

TVS-2M fuel rods are one of the most advanced high consumption nuclear fuel element products which in used currently, to detect the helium pressure value inside the rod, destructive puncture method is using now, which is not economically and automatically. For these reasons, non-destructive method is considered to carry out measuring. The use of Fourier's law of thermal conductivity and the basic principles of fluids, combined with the relevant principles of electronic control, then established TVS-2M fuel rod non-destructive helium pressure equipment, did explore fuel rod heating parts, and constructed digital-analog conversion simulation of the absolute pressure of the gas P and the measured value of the analog signal Du function of the relationship between the helium pressure in the rod for the measurement of the helium pressure. The following conclusions were obtained: Firstly, the most accurate helium pressure detection site is located at 50mm from the upper end plug of the fuel rod. Secondly, through digital-to-analog conversion, a model for detecting the helium pressure value inside the fuel rod was established to accurately measure the helium filling pressure inside the fuel rod.