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Support rod-containing irradiation target for producing molybdenum-99 isotope in heavy water reactor

A technology of support rods and heavy water reactors, which is applied in the direction of specific isotope recovery, transformation in nuclear reactors, and devices for transforming chemical elements by radiation. It can solve the problems of low content and low efficiency, and achieve good quality, high efficiency, and specific activity. high effect

Pending Publication Date: 2021-06-11
SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But conventional fuel bundles use natural uranium, in which 235 The U content is too low to be extracted directly from conventional fuel bundle fission products 99 Mo efficiency is too low

Method used

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  • Support rod-containing irradiation target for producing molybdenum-99 isotope in heavy water reactor
  • Support rod-containing irradiation target for producing molybdenum-99 isotope in heavy water reactor
  • Support rod-containing irradiation target for producing molybdenum-99 isotope in heavy water reactor

Examples

Experimental program
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Embodiment 1

[0036] see Figure 4 , in this example using 235 UO with a U enrichment of 19.5 wt% 2 The enriched uranium core 1-1 formed by stacking pellets, and the support rod 1-2 made of Zr-4 material have three through holes. The three through holes are evenly distributed into a regular triangle around the center of the support rod 1-2, and the distance between the center of the through hole and the center of the support rod 1-2 is 4 mm. The diameter of the enriched uranium core 1-1 is 1.6 mm, which is tightly embedded in the through hole of the support rod 1-2. The outer diameter of the support rod 1-2 is 13.1 mm.

[0037] The enriched uranium core 1-1 can be produced under neutron irradiation 99 Mo, while providing a suitable calorific value. The 18 fuel elements in the outermost circle of the irradiation target are Figure 4 The fuel element 1 shown in the figure 2 The conventional fuel element shown in , produced from a single irradiation target 99 Mo isotopes are at 1000 C...

Embodiment 2

[0040] see Figure 5 , in this example, the support rod 1-2 with an outer diameter of 12.2 mm is also covered with a casing 4 . In this example, the cladding 4 is a thin-walled tube made of Zr-4 material, the inner diameter of which is 12.3 mm, and the outer diameter is 13.1 mm.

[0041] The support rod 1-2 made of Zr-4 material has three through holes, and the three through holes are evenly distributed into a regular triangle around the center of the support rod 1-2. The distance between the center of the through hole and the center of the support rod 1-2 is 4 mm. Three through holes are closely embedded 235 UO with a U enrichment of 19.5 wt% 2 Stacked enriched uranium cores 1-1, UO 2 The diameter of the enriched uranium core 1-1 is 1.6mm.

[0042] The enriched uranium core 1-1 can be produced under neutron irradiation 99 Mo, while providing a suitable calorific value. The 18 fuel elements in the outermost circle of the irradiation target are Figure 5 The fuel element...

Embodiment 3

[0045] see Image 6 , in this example, the support rod 1-2 with an outer diameter of 12.2 mm is also covered with a casing 4 . In this example, the cladding 4 is a thin-walled tube made of Zr-4 material, the inner diameter of which is 12.3 mm, and the outer diameter is 13.1 mm.

[0046] The support rod 1-2 made of Zr-4 material is evenly distributed with three through holes around the center of the circle, and a filler through hole is also opened at the center of the support rod 1-2; the distance between the center of the through hole and the center of the support rod 1-2 is 4mm.

[0047] The three through holes are closely embedded with 235 UO with a U enrichment of 19.5 wt% 2 The enriched uranium core 1-1 with a diameter of 1.5mm is formed by stacking pellets. A filler body 5 with a diameter of 4.9mm is closely embedded in the through hole of the filler body. The filler body 5 is made of depleted uranium UO 2 Stacked pellets, depleted uranium UO 2 pellet 235 The U enri...

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Abstract

The invention relates to the technical field of fission type nuclear reactors, in particular to a support rod-containing irradiation target for producing a molybdenum-99 isotope in a heavy water reactor. The irradiation target comprises a fuel rod bundle; the fuel rod bundle comprises a plurality of fuel elements and end plates welded to the two ends of the fuel elements; and at least one fuel element comprises a supporting rod and uranium enrichment cores, at least two through holes are formed in the supporting rod, the uranium enrichment cores are embedded in the through holes of the supporting rod, the uranium enrichment core is made of a uranium enrichment material with the <235>U enrichment degree ranging from 15.0 wt% to 20.0 wt%, and the through holes are formed in the axial direction of the supporting rod. Compared with the prior art, the irradiation target disclosed by the invention has the advantages that the characteristic that the heavy water reactor is refueled without stopping the reactor is fully utilized, the <99>Mo with short half-life period can be continuously produced by utilizing an existing reactor, a new irradiation facility does not need to be specially constructed, and the <99>Mo produced by using the enriched uranium is high in efficiency and good in quality, namely high in specific activity; and when the irradiation target is used for producing <99>Mo, the influence on power generation of a nuclear power plant can be reduced to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of fission nuclear reactors, in particular to an irradiation target containing support rods for producing molybdenum-99 isotope in a heavy water reactor. Background technique [0002] Nuclear medicine is an indispensable and important subject in medicine. It plays a special role in the diagnosis and treatment of human diseases and has developed rapidly in recent years. 99m Tc can be combined with a variety of ligands to form a variety of organ and functional imaging agents, which can be used to diagnose various diseases and judge changes in the function of human organs. According to data from Nature News & Comment, the world uses 99m The clinical diagnosis of Tc-related imaging technology reaches 30 million to 40 million person-times, accounting for 80% of all nuclear medicine applications. [0003] 99m Tc has a very short half-life of only 6.02 hours and usually needs to be replaced by its parent isotope...

Claims

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Application Information

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IPC IPC(8): G21G1/00G21G1/02
CPCG21G1/001G21G1/02G21G2001/0036Y02E30/30
Inventor 卢俊强陈芙梁韩宇丁阳韦享雨周云清
Owner SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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