A Vacuum Mounting Process for Samples After Irradiation

An inlay process and vacuum technology, applied in the field of nuclear fuel irradiation detection, can solve unreliable, inaccurate inspection results of rod-shaped fuel elements, the inner surface of the fuel cladding, the outer surface of the fuel core and the crack shape are not effectively protected. and other problems to achieve the effect of improving the accuracy and evaluating the irradiation performance accurately.

Active Publication Date: 2020-05-05
NUCLEAR POWER INSTITUTE OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a vacuum mosaic process for samples after irradiation, so as to solve the problems caused by the failure of the resin to fill the gap between the shell and the core block well and the cracks on the core block in the prior art. The inner surface of the fuel cladding, the outer surface of the fuel core, and the crack morphology are not effectively protected, which eventually leads to inaccurate and unreliable inspection results of rod-shaped fuel elements, which seriously affects the evaluation of the radiation performance of fuel elements

Method used

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  • A Vacuum Mounting Process for Samples After Irradiation
  • A Vacuum Mounting Process for Samples After Irradiation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Such as figure 1 A vacuum mosaic process for a sample after irradiation is shown, comprising the following steps:

[0045] (A) Cutting sample preparation, selecting fuel elements at characteristic positions, cutting and preparing samples, the height of the prepared samples is 20mm;

[0046] (B) Cold mounting the sample, put the sample into the mounting tube with an outer diameter of 25 mm in the hot chamber, and then fill the mounting tube with epoxy resin for cold mounting, and the filling height of the epoxy resin is 20 mm;

[0047] (C) Grinding and polishing the sample, using a hot chamber polishing machine, grinding the sample on a 220 mesh, 600 mesh and 1200 mesh diamond grinding disc in turn, and then using diamond suspensions with a particle size of 9 μm, 3 μm and 1 μm in sequence. The sample is polished, and finally the gap between the cladding and the core block in the sample and / or the cracks on the core block are exposed on the polished surface of the sample...

Embodiment 2

[0053] Such as figure 2 As shown, on the basis of Embodiment 1, an inlaid ring installation device is designed to install the inlaid ring with a manipulator in the hot chamber. Specifically, the sample is placed in the inlay ring installation device to install the inlay ring 5. The inlay ring installation device includes a fixed cylinder 1 for placing the sample 4, and four guide rods 2 are arranged on the top surface of the fixed cylinder 1. , four guide rods 2 are evenly arranged along the circumference of the fixed cylinder 1; the guide rods 2 are bent to the outside of the fixed cylinder 1, and the position of the bending point of the guide rods 2 is configured such that the sample 4 is located in the fixed cylinder 1, and When the bottom surface of the sample 4 is flush with the bottom surface of the fixed cylinder 1, the bending point of the guide rod 2 is located above the sample 4; The outer diameter; the height of the mosaic ring 5 is 1-2 mm.

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Abstract

The invention discloses a vacuum mosaic process for samples after irradiation, which comprises the following steps: (A) cutting samples, selecting fuel elements at characteristic positions, and cutting to prepare samples; (B) cold mosaic samples, in a hot chamber Put the sample into the mounting tube, and then fill the mounting tube with resin for cold mounting; (C) grind and polish the sample, grind the sample, and polish the sample after grinding, so that the shell in the sample The gap with the pellet and / or the crack of the pellet is exposed on the polished surface of the specimen; (D) Adhere the mounting ring, with the polished surface of the specimen facing up, and attach the mounting ring to the mounting tube on the polished surface ; (E) Pouring resin, pouring resin into the mosaic ring to the polished surface of the sample; (F) vacuuming; (G) curing. The invention adopts a secondary inlay process combining cold inlay and vacuum inlay to improve the accuracy and reliability of the inspection results of rod-shaped fuel elements, so that the fuel element radiation performance evaluation is more accurate.

Description

technical field [0001] The invention relates to the field of detection of nuclear fuel after irradiation, in particular to a vacuum mosaic process for samples after irradiation. Background technique [0002] Rod-shaped fuel elements are the mainstream fuel elements used in nuclear power plants at present, and their basic structural form is to encapsulate cylindrical fuel pellets in zirconium alloy cladding. Because the fuel pellets of rod-shaped fuel elements are arranged in the zirconium alloy cladding by filling, a certain filling gap is considered in the design, which is about tens of microns; at the same time, because the fuel pellets are made of ceramic materials, when the fuel consumption is high, The fuel pellets will crack and even form a three-dimensional network-like crack network. [0003] Post-irradiation inspection of fuel elements is an important part of irradiation performance evaluation and irradiation effect research, and is of great significance to the saf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C21/02G21C17/06
CPCG21C17/06G21C21/02Y02E30/30
Inventor 朱伟彭艳华张伟何文吴拥军杨帆吴璐王桢方忠强
Owner NUCLEAR POWER INSTITUTE OF CHINA
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