Shielding assembly structure with high-efficiency shielding properties

A technology of shielding performance and component structure, applied in the field of shielding component structure with high-efficiency shielding performance, can solve the problems of unfavorable long-life use of the reactor vessel, increased radiation of the reactor vessel, difficult industrial processing, etc., and achieves good protection effect, Improve reliability and security, and improve performance

Inactive Publication Date: 2017-10-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0004] (1) Since the end plug, air cavity, and compression spring in the shielding rod of the shielding assembly occupy a certain volume, the shielding effect of the shielding assembly on fast neutrons and gamma rays at the height where the end plug, air cavity, and compression spring are located Weakening, so that the radiation received by the reactor vessel at the same height increases, which is not conducive to t

Method used

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  • Shielding assembly structure with high-efficiency shielding properties
  • Shielding assembly structure with high-efficiency shielding properties
  • Shielding assembly structure with high-efficiency shielding properties

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Embodiment 1

[0032] Such as Figure 6 As shown, 19 shielding element balls with a diameter of R are placed in an equilateral triangle on each layer, and the shielding element balls on adjacent layers are arranged in the same way. Stack upwards in turn, and stack the H / R layer shielding element balls together. At the same time, the vibration of the shielding element ball under the action of the coolant is limited through the restraining effect of the support rods and the upper and lower grid plates. The implementation of this shielding component has been numerically simulated by simulation software. At the original height of the rod cavity and end plug of the shielding component, the neutron flux reaching the reactor vessel is reduced by 21%, which improves the overall shielding effect of the shielding component.

Embodiment 2

[0034] Such as Figure 7 shown. On the basis of Embodiment 1, the diameter is R 1 , R 2 Two sizes of shielding element balls, the diameter of the smaller shielding element ball . The shielding element balls are staggered up and down, so that the small shielding element balls are in the gap between the large shielding element balls of the adjacent layer, and are in contact with the large shielding element balls of the upper and lower layers. Due to the restraint effect of the support rods and the upper and lower grid plates, the vibration of the large shielding element ball under the action of the coolant is very small. At the same time, the large shielding balls in the adjacent layers also have constraints on the small shielding balls. Compared with the first solution, the overall shielding performance of the shielding component is improved by about 12%. However, since the flow channel of the coolant becomes smaller, the thermal stress of the shielding component also in...

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Abstract

The invention belongs to the technical field of shielding of fast-neutron reactors, and particularly relates to design of a shielding assembly structure with high-efficiency shielding properties. On the basis of maintaining the hexagonal outer sleeve, the inside of the shielding assembly is filled with shielding element balls from bottom to top, thereby simplifying the original design of the end plugs, cavity, holddown spring and wrapping wire of the shielding element bar, and enhancing the neutron and gamma-ray radiation shielding properties of the shielding assembly. The two-layer ceramic material design of the shielding element balls ensures the completeness and reliability of the shadowing assembly in the operation period; the loose pyrolytic carbon ceramic material of the inner layer provides storage space for the radiation activation product, absorbs the radiation-induced swelling of the boron carbide shielding material, and buffers the stress caused by the temperature and radiation; and the compact and isotropic pyrolytic carbon ceramic material of the outer layer provides a second protection layer, thereby preventing the loose pyrolytic carbon ceramic material layer of the inner layer from mechanical damage, and further enhancing the safety of the shielding element balls.

Description

technical field [0001] The technical field of reactor fast neutron shielding, in particular to a structural design of shielding components with high-efficiency shielding performance. Background technique [0002] There are many kinds of radiation in the nuclear reactor, and most of the radiation is harmful to the materials of the equipment. The radiation damage will change the performance of the equipment materials and affect the normal operation of the reactor. Among them, neutron and gamma-ray irradiation are the main causes of radiation damage to reactor materials. In order to prevent excessive radiation damage to structural materials in the reactor and protect the reactor vessel itself, fast neutron reactors need to arrange shielding components around the core. Perform axial shielding. [0003] In the prior art, the fast reactor shielding assembly mainly adopts the design of shielding element rods. The shielding element rods are arranged in an equilateral triangle. A s...

Claims

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Application Information

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IPC IPC(8): G21C11/00G21C15/02G21F1/02G21F1/06G21F3/00
CPCG21C11/00G21C15/02G21F1/02G21F1/06G21F3/00Y02E30/30
Inventor 刘军黄美孙凯丽刘冉汤建楠赵媛媛
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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