High-specific-activity radioactive source core target, radioactive rod and novel thimble plug assembly

Abstract

The invention discloses a high-specific-activity radioactive source core target. Neutrons are absorbed in a nuclear reactor core so as to generate radioactive isotopes. A matrix, a casing pipe and radioactive source needle which absorbs the neutrons so as to generate the radioactive isotopes are included. The matrix presents a hollow structure and forms a gas chamber. Source needle grooves are uniformly arranged around a radial direction of the matrix and an irradiation source layer is formed. The source needle grooves on the same irradiation source layer surround and form a circle. A center of the circle is located on a central axis of the gas chamber. An axial direction of the matrix possesses at least two irradiation source layers and the layers are arranged in parallel with an equal interval. Source needles are symmetrically inserted into the source needle grooves of the same irradiation source layer. The matrix is arranged into the casing pipe in a sealing mode and helium is filled into the gas chamber. The invention also discloses a radioactive rod possessing the high-specific-activity radioactive source core target and a novel thimble plug assembly. The assembly can restrict a reactor core coolant bypass flow and can generate the radioactive isotopes. Economic benefits are remarkable and industrial, agricultural and medical demands can be satisfied.

Description

technical field [0001] The invention relates to a nuclear reactor component, in particular to a high specific activity radioactive source core target capable of producing radioactive isotopes, a radioactive rod and a novel choke plug component. Background technique [0002] Radioisotopes are widely used in various fields such as industry, agriculture, medicine and scientific research. The current production of isotopes mainly relies on heavy water reactors, low-power research reactors or accelerators, some of which are produced domestically and occasionally imported from abroad, but the supply is still scarce and it is difficult to meet the growing demand. [0003] Commonly used radioactive isotopes include cobalt-60, cesium-137, iridium-192, etc. Taking cobalt radioactive isotopes as an example, cobalt-59 is irradiated in the reactor for an appropriate time, and cobalt-59 can obtain cobalt-60 with high specific activity by absorbing a neutron. Cobalt-60 is the most common...

AI Technical Summary

Problems solved by technology

[0006] (1) The adjusting rod is used as a control rod to adjust the reactivity of the core. When the operating conditions of the reactor need to be adjusted with the adjusting rod, it is inevitable that the adjusting rod is often drawn out or inserted into the core, which will affect the bound cobalt. As far as the cobalt target in the adjustment rod is concerned, there is a phenomenon that the irradiation dose is unstable;

[0007] (2) Replace the stainless steel adjusting rod with cobalt-bound adjusting rod to adjust the reactivity, which has an impact on the operation of the reactor. Multiple analyzes and rational design are required for nuclear characteristics, thermal engineering, radiation safety, etc., and demonstration work large and complex;

[0009] (4) This technology is only applicable to heavy water reactors. Very few nuclear power plants at home and abroad use heavy water reactors. At present, there are only two in my country, and the application range is limited, which limits the production of cobalt radioactive sources and is difficult to meet medical or industrial and agricultural requirements. The needs of a wide range of application markets

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