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Method and device for detecting structural abnormalities in a spherical particle, mainly in a nuclear fuel particle for high temperature or very high temperature reactors

A spherical particle, particle technology, used in reactors, measurement devices, nuclear reactor monitoring, etc., can solve problems such as presence and position sensitivity

Inactive Publication Date: 2009-09-30
FRAMATOME ANP
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Problems solved by technology

[0008] A disadvantage of this approach is that the output signal captured at the end of the induction coil is not only sensitive to the presence and location of structural defects in the particle, but also to many other physical parameters of the particle, such as its size, the material from which the particle is composed etc. sensitive
Therefore, this method cannot discriminate with high reliability between non-defective particles and those containing structural defects

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  • Method and device for detecting structural abnormalities in a spherical particle, mainly in a nuclear fuel particle for high temperature or very high temperature reactors
  • Method and device for detecting structural abnormalities in a spherical particle, mainly in a nuclear fuel particle for high temperature or very high temperature reactors

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Embodiment Construction

[0033] figure 1 The structure of nuclear fuel particles 1 for high temperature or very high temperature reactors (HTR / VHTR) is schematically illustrated.

[0034] Conventionally, the particle 1 is generally substantially spherical, and contains continuously from the inside to the outside:

[0035] - Fissile material core3, e.g. based on UO 2 or UCO,

[0036] - porous pyrolytic carbon layer (pyrocarbon) 5,

[0037] - dense first pyrolytic carbon layer 7,

[0038] - silicon carbide layer 9 and

[0039] - A dense second pyrolytic carbon layer 11 .

[0040] When using such particles, the porous pyrolytic carbon acts as a reservoir for the fission gas, the silicon carbide acts as a barrier to prevent the diffusion of solid fission products, and the dense pyrolytic carbon ensures mechanical resistance to the pressure of the fission gas.

[0041] The core 3 has, for example, a diameter of approximately 500 μm, and the thicknesses of the layers 5 , 7 , 9 and 11 are, for example,...

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Abstract

The invention relates to a method for detecting at least one structural abnormality in a spherical particle (33) that comprises at least the following steps: passing the particle (33) through at least one induction coil (15); exciting the induction coil (15) in order to generate Foucault currents in the particle (33); receiving an output signal at the terminals of the induction coil (15); and analysing the signal in order to determine whether or not the particle includes a structural abnormality. Several output signals can be received by passing the particle (33) successively through one or more induction coils (15) with different positions of the particle (33), the or each induction coil (15) being excited at least upon each passage of the particle (33) in order to induce Foucault currents in he particle (33).

Description

technical field [0001] The present invention generally relates to methods for detecting structural defects in spherical particles, in particular nuclear fuel particles for high or very high temperature reactors. Background technique [0002] More precisely, according to a first aspect, the invention relates to a method for detecting at least one structural defect in spherical particles, the method comprising at least the following steps: [0003] - passing the particles through at least one induction coil; [0004] - Excitation of the induction coil in order to induce a Foucault current in the particles; [0005] - capture the output signal at the end of the induction coil; and [0006] - Analyze the signal in order to determine whether the particles contain structural defects. [0007] In 1986, an article in the second edition of the "Nondestructive Testing Handbook" published by the American Society for Nondestructive Testing (ASNT), Volume IV, pages 195-197, described ...

Claims

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Application Information

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IPC IPC(8): G21C17/06G01N27/90
CPCG21Y2002/304G21Y2004/40G21C17/066G01N27/904G01N27/9026G21Y2002/204G21Y2004/304Y02E30/30
Inventor S·赫默希拉-拉拉L·格拉沃特
Owner FRAMATOME ANP
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