Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Nuclear fuel element doped with technetium-99

A technology of nuclear fuel elements and fuel pellets, which is applied in the direction of reactor fuel materials, nuclear power generation, and greenhouse gas reduction, and can solve the problems of small Doppler coefficient and low inherent safety characteristics

Inactive Publication Date: 2012-12-19
NANHUA UNIV
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to solve the problems of small Doppler coefficient and low inherent safety characteristics of the reaction of the inert matrix fuel element, and provide a kind of technology that uses technetium-99 to replace part of uranium-238, and utilizes the resonance characteristics of technetium-99 to enhance the fuel element Doppler coefficient, reduce MA output, and at the same time can transmute some technetium-99 doped technetium-99 nuclear fuel elements

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Nuclear fuel element doped with technetium-99
  • Nuclear fuel element doped with technetium-99

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] Such as figure 1 As shown, a nuclear fuel element doped with technetium-99 includes a zirconium four-alloy cladding tube 3, a fuel pellet 4, a pellet compression spring 2, an upper end plug 1, and a lower end plug 5, and the fuel pellets 4 are stacked into In the zirconium four-alloy cladding tube 3, after being compressed by the pellet compression spring 2, the upper and lower ports of the cladding tube 3 are respectively sealed and fixed by the upper end plug 1 and the lower end plug 5, and the fuel pellet 4 is technetium-99 and A mixture of uranium oxide, wherein the ratio of the nuclear density of technetium-99 to the sum of the nuclear density of technetium-99 and uranium-238 in uranium dioxide is 10% to 90%. During the preparation process of the fuel pellet 4, uranium dioxide and technetium-99 powder are firstly mixed uniformly, then the mixed powder is pressed into shape, and sintered at high temperature to obtain a pellet blank, and finally the pellet blank is g...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a nuclear fuel element doped with technetium-99, which is characterized in that fuel pellets are overlapped to be placed into a zirconium quaternary alloy cladding pipe, after being compressed by a compression spring, two end ports of the cladding pipe are sealed and fixed by an end plug, and the nuclear fuel element is characterized in that each fuel pellet is a mixture of tachnetiuim-99 and uranium dioxide, wherein a ratio of the nuclear density of the technetium-99 and the sum of the nuclear density of technetium-99 and uranium-238 in the uranium dioxide is 10 percent to 90 percent. The resonance characteristic of the technetium-99 is utilized, and the technetium-99 is used for partially substituting the uranium-238 in the enriched uranium fuel, so that three purpose for enhancing the Doppler coefficient, reducing minor actinides nuclide so as to really reduce the minor actinides, guaranteeing the prompt negative temperature coefficient and transforming the nuclear waste technetium-99, and the safety of a reactor can be enhanced.

Description

technical field [0001] The invention relates to a nuclear reactor fuel element, in particular to a nuclear fuel element doped with technetium-99. Background technique [0002] The thermal neutron spectrum reactor is currently the main type of nuclear power in the world. A large number of thermal neutron reactor nuclear power plants use low-enriched uranium fuel, and the uranium-238 in the low-enriched uranium fuel can generate secondary Actinide nuclides, referred to as MA, these minor actinide nuclides have very long half-lives, some of which can reach 10 6 Years, radioactive toxicity is very strong; at the same time, some long-lived fission products produced by fission reactions, referred to as LLFP, have a half-life of up to 10 7 year. Neptunium-237 is the most productive MA in the spent fuel of low-enriched uranium thermal neutron reactors, and technetium-99 is the most productive LLFP. The source of MA is mainly the multiple neutron capture reactions of uranium-238. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G21C3/60
CPCY02E30/38Y02E30/30
Inventor 谢金森于涛
Owner NANHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com