Device special for preventing foreign matters in annular space of spent fuel dry storage sealed storage tank

Abstract

The invention discloses a device special for preventing foreign matters in an annular space of a spent fuel dry storage sealed storage tank. The device comprises a spent fuel dry transfer container, wherein a spent fuel dry-method sealed storage tank is arranged in the spent fuel dry-method transfer container, an annular cavity is formed between the spent fuel dry-method transfer container and thespent fuel dry-method sealed storage tank, a surface layer shielding pipe is arranged on the upper edge surface of the inner wall of the annular cavity, and a lead ring is arranged on the inner wallof the surface layer shielding pipe. According to the device, the surface layer shielding pipe made of wool and snakeskin materials and the lead ring composed of small lead balls are arranged, so thatcracking is not liable to occur when encountering high temperature generated by inner and outer lid friction; the wool and snakeskin materials have good high-temperature-resistant and wear-resistantcharacteristics, so that the lead balls in the surface layer shielding pipe can be protected from being damaged and exposed, the service lifetime of the annular-space foreign matter prevention deviceis greatly prolonged, and the radiation shielding effect of the annular-space foreign matter prevention device is greatly improved.

Description

technical field [0001] The invention relates to the field of mechanical design technology and material science, specifically a special device for preventing foreign matter in the annulus of sealed storage tanks for dry storage of spent fuel, which can be widely used in anti-foreign matter, heat insulation and radiation shielding in high-radiation uneven places Work. Background technique [0002] At present, the domestic spent fuel dry storage process is gradually improving its process flow and introducing foreign emerging technologies to make the entire dry storage process more concise and smooth. During the implementation of the dry storage process, the sealed storage tank needs to be sealed and welded. After the welding is completed, the interior should be vacuum-dried and helium backfilled. During the sealing process, due to the slight deformation of the sealed storage tank during transportation and welding, it often leads to difficulties in the adaptation of the inner a...

AI Technical Summary

Problems solved by technology

This method has a big defect, that is, the surface of the shielding layer is not resistant to high temperature and is easy to break, causing the contaminated shielding material in the shielding layer to fall into the ring gap and form foreign matter

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