Neutron protective body plug and material thereof

Abstract

The invention discloses a neutron protective body plug and a material thereof, and the plug is composed of front and rear blocks (3,4,8,9), left and right blocks (1,2,6,7) and middle blocks (5,10), wherein the front and the rear blocks (3,4,8,9), the left and the right blocks (1,2,6,7) and the middle blocks (5,10) are arranged on an upper layer and a lower layer and are symmetrical in shape respectively, the external circles of the front and the rear blocks and the left and the right blocks of the upper layer and the lower layer are all arc curved surfaces, and the middle blocks are of a quadrangular-prism shape; and a cylindrical structure is formed after the blocks are combined, and grooves with same widths but different depths are respectively processed on the arc curved surfaces of the front and the rear blocks of the upper layer and the lower layer so as to ensure that the grooves are rightly engaged after the upper layer and the lower layer are combined. The material of the neutron protective body plug comprises the following components: 30-40% of polyethylene, 10-20% of chlorinated polyethylene, 6-14% of polyvinyl alcohol, 25-35% of aluminium hydroxide and 5-10% of colemanite; and the neutron protective body plug comprises the elementary components with the contents as follows: not less than 9.0% of aluminium, not less than 0.85% of boron, not less than 1.10% of calcium, not less than 40% of carbon, not less than 3.5% of chlorine, not less than 7.5% of hydrogen, not less than 25% of oxygen and not less than 1.0% of impurity. The neutron protective body plug can effectively absorb and shield radiation generated by a neutron-ray, and has stability and fine mechanical strength under thermal neutron radiation.

Description

technical field [0001] The present invention relates to a neutron shield plug and its material, in particular to a hole plug and its material for a measurement chamber at the bottom of a nuclear power plant reactor cavity, the main function of which is to shield neutron radiation. The material is mainly used in nuclear power plants. Background technique [0002] The bottom of the nuclear power plant reactor cavity is equipped with a measurement cavity to facilitate measurement and maintenance work. The plug matched with the round hole of the measuring chamber must have certain conditions such as compressive strength, tensile strength, service temperature and neutron radiation shielding. Therefore, the shape and material quality of the plug are to prevent the leakage of neutron rays The essential. The prior art is to use polyethylene, polychloride, polyester resin, alumina, colemanite as raw materials, and produce plastic products as neutron shield plugs through batching, k...

AI Technical Summary

Problems solved by technology

The prior art is to use polyethylene, polychloride, polyester resin, alumina, colemanite as raw materials, and produce plastic products as neutron shield plugs through batching, kneading, extrusion, injection molding and other processes; Its disadvantages are: the polychloride in the raw material is difficult to produce because of the complex production process, and the raw material is very scarce

The melting temperature of polyester resin is too high, resulting in high processing and molding temperature, which is not conducive to production

Because the existing plug is an integral cylinder, not only the mold is large and the injection pressure is high during processing and molding, but the integral cylinder is not easy to cooperate with the measuring cavity

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