Fuel assembly for isotope production of nuclear reactor

A technology for nuclear reactors and fuel assemblies, which is applied to the assembly of reactor fuel materials, fuel elements, and fuel elements, etc., can solve the problems affecting the safety of nuclear power plants, affecting the power generation and economy of nuclear power plants, and increasing the power peak factor of local fuel rods, etc. It can reduce the influence of reactivity and power peak factor, improve the processing and forming performance, and reduce the difficulty of separation and purification.

Pending Publication Date: 2022-02-01
SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this solution is that the base material (Np-237) of the target will strongly absorb neutrons, which will affect the normal power generation and economic efficiency of the nuclear power plant. The enrichment of U-235 will further increase the power peak factor of local fuel rods, which will affect the safety of nuclear power plants

Method used

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  • Fuel assembly for isotope production of nuclear reactor
  • Fuel assembly for isotope production of nuclear reactor
  • Fuel assembly for isotope production of nuclear reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The radioisotopic material NpO 2 An annular base material 5 core block with a wall thickness of 3 mm is prepared, the base material 5 has an outer diameter of 12 mm and an inner diameter of 5.7 mm, and is packed into the outer cladding shell 1 of zirconium alloy. Base metal 5 pellets made of NpO 2 It is prepared by mixing with Zr powder, the volume fraction of Zr powder is not less than 30%, the density after compression molding is about 80%, and the density of sintering can reach more than 95%.

[0031] Will UO 2 Pellet 6 was prepared as a solid pellet with a diameter of 5.5 mm, and the enrichment of U-235 was increased to 25.8%. The prepared solid UO 2 The pellet 6 is placed on the radioactive isotope material NpO 2 In the ring-shaped parent material 5 core blocks, the specific form is as image 3 shown.

[0032] Base metal 5 and UO 2 The pellets 6 are independent of each other, and the isotope base material NpO can be directly dismantled in the nuclear power p...

Embodiment 2

[0034] Ring UO 2 The design of the core block 6, select the annular UO with a wall thickness of 2.5mm 2 The pellet 6 has an outer diameter of 12 mm and an inner diameter of 7 mm, and the enrichment degree of U-235 is increased to 30%, and is loaded into the outer shell 1 .

[0035] NPO 2 Base material 5 is made of NpO 2 It is mixed with SiC powder to prepare a base material 5 with a diameter of 5.5mm, the volume fraction of SiC powder is not less than 30%, the compactness after compression molding is about 80%, and the compactness of sintering can reach more than 95%. NpO 2 The base metal 5 is put into the zirconium alloy inner cladding 4 to prepare thin-diameter rods. The outer diameter of the inner cladding 4 is 6.85mm and the inner diameter is 5.7mm.

[0036] The prepared NpO 2 The base metal 5 is placed on the annular UO 2 Pellet 6, as in figure 2 shown. UO 2 and NpO 2 independent of each other and can be directly separated.

Embodiment 3

[0038] The radioisotope material TeO 2 The base material 5 is prepared as an annular pellet with a wall thickness of 2mm, the outer diameter of the pellet is 11.2mm, and the inner diameter is 7.2mm, which is loaded into the outer shell 1 of zirconium alloy. Base metal 5 pellets made of TeO 2 It is prepared by mixing with alumina powder, the volume fraction of alumina powder is not less than 40%, the density after compression molding is about 85%, and the density of sintering can reach more than 95%.

[0039] Will UO 2 Pellet 6 was prepared as a solid pellet with a diameter of 5.7mm, and the enrichment of U-235 was increased to 46.7%. Will UO 2 The pellet 6 is put into the zirconium alloy inner cladding 4 to prepare a thin-diameter rod. The zirconium alloy inner cladding is 46.8mm in diameter and 5.7mm in inner diameter. The prepared solid UO 2 The pellet 6 is placed on the radioactive isotope material TeO 2 In the annular core block, the specific form is as image 3 sho...

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Abstract

The invention relates to the technical field of isotope production of nuclear power plants, and particularly discloses a fuel assembly for isotope production of a nuclear reactor, the fuel assembly comprises an outer shell, an upper sealing element, a lower sealing element, a base material and a UO2 pellet, the outer shell is of a tubular structure, and the upper sealing element and the lower sealing element are arranged at the two ends of the outer shell respectively; the base material and the UO2 pellet are both arranged in the outer shell, and the base material and the UO2 pellet are arranged in a nested mode; by adjusting the enrichment degree and the size of the UO2 pellet, the influence on the reactivity of a fuel rod due to the fact that a base material absorbs neutrons is compensated, the influence of a target piece on the reactivity and a power peak factor of a reactor core of a nuclear power plant is greatly reduced, it is guaranteed that the thermal performance does not obviously change, and the safety of the nuclear power plant is guaranteed; mutual independence of the UO2 fuel rod and the base metal rod is realized, the base metal rod for producing isotopes after irradiation in a nuclear power plant is detached and transferred to a hot chamber for separation and purification, and the difficulty of separation and purification between the base metal and UO2 is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of producing isotopes in nuclear power plants, in particular to a fuel assembly used for producing isotopes in nuclear reactors. Background technique [0002] Radioisotopes have a wide range of applications in biomedicine, industry, and agricultural production. In medicine, isotopes are mainly used for imaging, diagnosis and treatment. Industrial applications mainly include process control and optimization, measurement and automation, quality control and various tests. Agricultural applications mainly include isotope radiation breeding technology, isotope tracer technology etc. At present, there are two main ways to produce radioisotopes: research reactors and cyclotrons. The production of radioisotopes by research reactors has great advantages in terms of production scale, stability and production efficiency, and has become the most important production method of radioisotopes. In addition, since the res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/06G21C3/10G21C3/32G21C3/58
CPCG21C3/06G21C3/10G21C3/32G21C3/58Y02E30/30
Inventor 卢俊强张满谢汉芳党宇董思莹韩宇丁谦学
Owner SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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