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Comprehensive method for quantitatively evaluating the aging degree of nuclear grade cable

A technology for quantitative evaluation of aging degree, applied in the direction of measuring devices, sampling devices, instruments, etc., can solve the problems that there is no more effective method, the law of material aging and the accurate prediction of service life, etc.

Active Publication Date: 2019-11-15
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the existing aging mechanism of polymer materials is relatively mature, and various chemical reaction equations and mathematical formulas have been proposed, such as cross-linking mechanism, chain scission mechanism, linear energy transfer mechanism, diffusion-limited oxidation mechanism, etc., how to establish them and There is still no effective method for the relationship between the macroscopic properties of the material and the aging time, especially the quantitative relationship, so that it is impossible to accurately predict the aging law and service life of the material

Method used

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  • Comprehensive method for quantitatively evaluating the aging degree of nuclear grade cable
  • Comprehensive method for quantitatively evaluating the aging degree of nuclear grade cable
  • Comprehensive method for quantitatively evaluating the aging degree of nuclear grade cable

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1: Quantitative evaluation of the aging degree of nuclear-grade cable sheath materials

[0031] After a certain ethylene-propylene rubber cable sheath material is irradiated with γ-rays at a fixed dose rate of 10 kGy / h, and subjected to different irradiation times, its elongation at break is measured according to step (1), and a graph is drawn. See figure 1 , it can be seen that the elongation at break shows a law of first-order exponential decay with the prolongation of irradiation time, and it drops to half of the initial value at about 100h;

[0032] The samples subjected to different irradiation times were made into cross-sectional thin slice samples according to the method of step (2), as shown in the schematic diagram figure 2 shown.

[0033] According to the method of step (3), the surface of the thin slice sample prepared in step (2) is scanned by using micro-infrared analysis technology.

[0034] According to the requirements of step (4), taking the...

Embodiment 2

[0037] Example 2: Quantitative evaluation of the aging degree of nuclear grade cable insulation materials

[0038] Under the condition of 500 kGy fixed cumulative dose of γ-ray irradiation, an ethylene-propylene rubber cable insulation material was irradiated with different dose rates (that is, different irradiation times), and its volume resistivity was measured according to step (1). and plot, see Figure 6, it can be seen that the volume resistivity decreases first and then increases with the prolongation of the irradiation time, but the data dispersion is relatively large;

[0039] The samples subjected to different radiation dose rates are made into cross-sectional thin slice samples according to the method of step (2), as shown in the schematic diagram figure 2 shown.

[0040] According to the method of step (3), the surface of the thin slice sample prepared in step (2) is scanned by using micro-infrared analysis technology.

[0041] According to the requirements of ...

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Abstract

The invention provides a comprehensive method for quantitatively evaluating the aging degree of a nuclear grade cable. Through comprehensive analysis of the performance of a polymer material of the nuclear grade cable before and after aging, including a targeted macroscopic mechanical and physical and chemical property test, and measurement of an aging mechanism and the microscopic characteristicsof the aging mechanism by a microscopic infrared analysis technology and a microscopic Raman analysis technology, a quantitative relationship among the macroscopic property, the microscopic characteristics and the aging time is established. The method can be used for quantitatively analyzing the aging degree of the nuclear grade cable under the service and test working conditions, thereby providing support for the service life prediction.

Description

technical field [0001] The invention belongs to the technical field of material detection for nuclear power equipment, and in particular relates to a comprehensive method for quantitatively evaluating the aging degree of nuclear-grade cables, in particular to a polymer material for nuclear-grade cable insulation and sheath aging under service and test conditions Quantitative evaluation method of degree. Background technique [0002] A large number of nuclear-grade cables are needed in nuclear power plants. It is preliminarily estimated that the length of cables for a one-million-kilowatt nuclear power unit exceeds 1,000 kilometers, and the contract value is at least 1 billion yuan. A typical nuclear-grade cable structure is generally composed of a core conductor, an insulating layer, an inorganic filler, and a sheath layer. Among them, the insulating layer and the sheath layer are made of polymer materials, and compared with metal materials and inorganic non-metallic materi...

Claims

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Application Information

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IPC IPC(8): G01N17/00G01N21/17G01N21/65G01N1/06
CPCG01N17/00G01N21/17G01N21/65G01N1/06G01N2021/1734
Inventor 龚嶷杨振国杨晓蕾
Owner FUDAN UNIV