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Application of technetium-99 as burnable poison element

A combustible, poisonous technology, applied in the direction of reactor fuel material, climate sustainability, greenhouse gas reduction, etc.

Inactive Publication Date: 2012-12-26
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Burnable poisons use nuclides with large neutron absorption cross-sections to absorb excess neutrons in chain fission reactions to suppress excess reactivity. Currently, the nuclides used in burnable poisons mainly include boron, erbium, and gadolinium. See New Technology Using Technetium-99 as a Burnable Poison Nuclide

Method used

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  • Application of technetium-99 as burnable poison element
  • Application of technetium-99 as burnable poison element
  • Application of technetium-99 as burnable poison element

Examples

Experimental program
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Embodiment Construction

[0012] Such as figure 1 As shown, the technetium-99 metal is first cut into a cylindrical metal block 4 with a diameter of 7.5-8.5 mm and a height of 12-13 mm, and then the technetium-99 metal block 4 is stacked into a cylindrical zirconium quadruple alloy casing 3 , after being compressed by the spring 2, the two ports of the cladding 3 are respectively sealed and fixed with the upper plug 1 and the lower plug 5 to form a technetium-99 combustible poison element, and the cladding 3 plays the role of containing radioactive substances, wherein the technetium-99 metal block The amount of 4 is adjusted according to the height of the active area of ​​the nuclear reactor. There is a 0.2mm air gap between the outer diameter of the cylindrical technetium-99 metal block 4 and the inner diameter of the zirconium four-alloy cladding 3 to accommodate the technetium-99 metal block 4 at the operating temperature of the reactor. According to the requirements of reactivity control and compo...

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Abstract

The invention discloses new application of technetium-99, in particular to application of technetium-99 as a burnable poison element in a nuclear reactor. By utilizing neutronabsorption performance of technetium-99, technetium-99 metal is made into a rod-bundle-shaped burnable poison element, which is arranged in a fuel assembly to be made into a burnable poison assembly. On one hand, the excess reactivity can be suppressed; and on the other hand, technetium-99 can be consumed, and therefore long-term radioactivity harm of technetium-99 can be reduced.

Description

technical field [0001] The present invention relates to a new application of technetium-99, especially as a burnable poison component in nuclear reactors. Background technique [0002] At present, nuclear power reactors are all fission nuclear energy systems, using the fission of uranium and plutonium to release energy. There are hundreds to thousands of types of fission fragments and their decay products produced by the fission of uranium and plutonium elements, and some of them have very long half-lives, up to 10 4 ~10 7 Years, known as long-lived fission products, have great potential threats to the environment, especially the biosphere. Therefore, proper disposal of long-lived fission products is related to the sustainable development of fission nuclear energy systems. Technetium-99 is the most prolific nuclide among long-lived fission products, with a half-life as long as 2.1×10 5 In 2009, a 1000MW class light water reactor operated for one year and unloaded techneti...

Claims

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Application Information

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IPC IPC(8): G21C3/60
CPCY02E30/38Y02E30/30
Inventor 于涛谢金森
Owner NANHUA UNIV
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