Novel choke plug assembly for using pressurized water reactor to prepare radioactive source, and radioactive rod

Abstract

The invention discloses a novel choke plug assembly for using a pressurized water reactor to prepare a radioactive source. The novel choke plug assembly comprises a connecting plate and stainless steel choke stoppers. The connecting plate is provided with mounting parts used for mounting the stainless steel choke stoppers. The 24 mounting parts are distributed in a scattered manner. The novel choke plug assembly further comprises N radioactive rods which are used to absorb neutrons and produce radioactive isotopes, wherein N is a natural number which is less than or equal to 24. The radioactive rods are correspondingly mounted on N mounting parts in a suspended manner, the stainless steel choke stoppers are correspondingly mounted on the remaining mounting parts in a suspended manner, and the radioactive rods and the stainless steel choke stoppers are parallel to each other. The novel choke plug assembly for using a pressurized water reactor to prepare a radioactive source not only can limit the reactor core coolant bypass flow, but also can produce radioactive isotopes, has remarkable economic benefit, and can greatly satisfy the needs of industrial, agricultural and medical use. The invention further discloses a radioactive rod.

Description

technical field [0001] The invention relates to a nuclear reactor component, in particular to a novel choke plug component and a radioactive rod capable of producing radioactive isotopes and used in pressurized water reactors to prepare radioactive sources. Background technique [0002] Radioisotopes are widely used in various fields such as industry, agriculture, medicine and scientific research. The current isotope production mainly relies on 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 commonly used radio...

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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