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Fuel element as well as preparation method and application thereof

A technology of fuel elements and fuel layers, which is applied in the direction of fuel elements, manufacturing reactors, nuclear power generation, etc., and can solve problems such as slow heat dissipation, low power density, and high density of fuel elements

Active Publication Date: 2016-11-16
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a fuel element, its preparation method and its use in order to overcome the defects of existing fuel elements such as high density, easy breakage, low power density, and slow heat dissipation. It has the advantages of being small, having no fuel layer that can relieve the swelling of the fuel layer during service, not easy to break, high power density, fast heat dissipation, etc., and the shell layer has a dense structure, high compressive strength, and can prevent molten salt infiltration and fission product release

Method used

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  • Fuel element as well as preparation method and application thereof

Examples

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Embodiment 1

[0062] Embodiment 1 The preparation of the fuel element with the fuel layer in the innermost layer

[0063] (1) Using the SH method quasi-isostatic pressing process, the mixture of coated fuel particles and mesophase carbon microspheres is pressed into a spherical shape, and the pressing pressure is 100 MPa to obtain the fuel layer (1);

[0064] (2) Using the quasi-isostatic pressing process again, the fuel layer (1) is pressed into the raw material of the fuel-free layer (2), and the pressing pressure is 100 MPa. The raw material of (2) layer is mesophase carbon microspheres, and the sample (12) is obtained. . And carry out carbonization treatment, the carbonization temperature is 800 ℃. The heating rate is 1°C / min, and the temperature is kept at 800°C for 1 hour.

[0065] (3) Adopting the quasi-isostatic pressing process again, the sample (12) obtained by step (2) is packed into the shell layer (3) raw material, and the (3) layer raw material is 64% natural flake graphite,...

Embodiment 2

[0067] The fuel element of diameter 6cm that embodiment 2 makes

[0068] With reference to the preparation method of Example 1, a fuel element with a diameter of 6 cm was obtained, and its main parameters are shown in Table 1,

[0069] Table 1

[0070]

[0071] The base materials of the fuel-free layer and the fuel layer in this embodiment are all low-density mesophase carbon microspheres, which have the characteristics of gradual changes in density and thermal conductivity, which can reduce the density of the element body and make it more suitable for molten salt reactors. 2 The layer (no fuel layer) has a thermal conductivity of 35W / mK and a density of 1.45g / cm 3 , 3 layers (shell layer) thermal conductivity is 40W / mK, density is 1.8g / cm 3 .

[0072] At the same time, the average pore diameter of the shell layer is 1 μm, and the compressive strength of the shell layer is 40 MPa. In addition, the preparation process of the fuel layer and the non-fuel layer of the fuel ...

Embodiment 3

[0073] The fuel element of diameter 3cm that embodiment 3 makes

[0074] With reference to the preparation method of Example 1, a fuel element with a diameter of 3 cm was obtained, and its main parameters are shown in Table 2:

[0075] Table 2

[0076]

[0077]

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Abstract

The invention discloses a fuel element as well as a preparation method and application thereof. The fuel element disclosed by the invention is a sphere which sequentially comprises a fuel layer, a non-fuel layer, and a housing layer which are concentric from inside to outside, wherein the non-fuel layer is made from conventional base materials in the field. The fuel element has the advantages of being small in density, having the non-fuel layer which can alleviate swell generated in the service process of the fuel layer, being not liable to rupture, high in power density, fast in heat dissipation and the like; and besides, the housing layer is compact in structure, high in compressive strength, and capable of preventing fused salt from infiltrating and fission products from releasing, and can be used for reactors. The preparation method is simple and low in cost.

Description

technical field [0001] The present invention relates to a fuel element, its preparation method and its application. Background technique [0002] Fuel elements are the core components of the reactor. The quality of fuel elements is the basis for safe and efficient operation of the reactor. The direct goal of fuel element design is to produce and export fission energy most efficiently, maintain the integrity of the cladding material throughout its lifespan, maximize the confinement of fuel and radioactive fission products, and ensure the safety of workers and the surrounding environment. According to the requirements of the reactor for fuel elements and design criteria, as well as the feasibility and economy of fuel element manufacturing, reasonable selection of materials, determination of fuel element structure and design parameters are the main tasks of fuel element design. [0003] Molten salt reactor is one of the candidate reactor types of the fourth generation reactor...

Claims

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Application Information

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IPC IPC(8): G21C3/20G21C21/10
CPCG21C3/20G21C21/10Y02E30/30
Inventor 仲亚娟林俊姜海涛朱智勇
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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