A Drilling Device for Release of Fission Gas from Heavy Water Reactor Fuel Elements

Abstract

The invention discloses a drilling device for releasing the fission gas of heavy water reactor fuel elements, which comprises a frame, on which a sealing seat A (4) is arranged, and a sealing seat A (4) is arranged inside the sealing seat A (4) for installing heavy water reactor fuel elements ( 3) Hole A, seal seat A (4) is connected with gas collection seat (5), pipe fittings (6), seal seat B (7) and electric drill (8) in sequence, and the motor shaft connecting shaft (2) of electric drill (8) ), the shaft (2) is rotatably installed in the shaft hole of the seal seat B (7), the drill bit (1) is fixedly installed on the lower end of the shaft (2), and the drive of the electric drill (8) is fixedly installed on the frame device (9). The beneficial effect of the invention is that the fuel element of the heavy water reactor can be drilled in a highly radioactive environment, and the fission gas can be completely released.

Description

technical field [0001] The invention relates to the technical field of nuclear fuel cycle, in particular to a drilling device for releasing fission gas from heavy water reactor fuel elements. Background technique [0002] The measurement of fission gas release rate of reactor fuel elements is an important content of post-irradiation inspection, which provides a basis for evaluating the design, manufacture and performance improvement of heavy water reactor fuel assemblies and similar fuel assemblies. The piercing technology is to pierce the cladding of the fuel rod and release the fission gas completely by using the pressure difference. It is a key link in the analysis and measurement of the fission gas. There are two commonly used piercing methods: mechanical piercing and laser piercing. The release and collection devices of PWR fuel elements at home and abroad generally adopt the mechanical puncture method, mainly because the cavity volume of PWR fuel elements is large, the...

AI Technical Summary

Problems solved by technology

The release and collection devices of PWR fuel elements at home and abroad generally adopt the mechanical puncture method, mainly because the cavity volume of PWR fuel elements is large, the puncture position is basically unlimited, and parameters such as puncture depth and pressure are easy to control ; Due to the small volume of the free cavity of the heavy water reactor fuel element (about 0.5ml), which is similar to a solid core rod, and the impact of the fuel element support block on the sealing, the position of the puncture hole and the static sealing of the fuel element are difficult, and it is difficult to promote the use of mechanical puncture holes

Laser perforation, due to the strong laser energy, the device is installed in a hot chamber, and the technical parameters are not easy to control. The perforated cladding may damage the fuel pellets or even dissolve the fuel element. Long-term use makes equipment maintenance difficult.

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