Device and method for measuring diameter of dense pipe bundle and thickness of oxide film on site

A thickness measurement and oxide film technology, which is used in nuclear reactor monitoring, reactors, nuclear power generation, etc., can solve the problems of large measurement errors, the diameter of dense tube bundles and the thickness of oxide films are difficult to measure at any position in the whole stroke, to achieve detection safety, Reliable measurement results and the effect of preventing radiation damage

Active Publication Date: 2017-10-20
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that it is difficult to measure the size of any position in the full stroke when measuring the diameter of the dense tube bundle and the thickness of the oxide film on the existing site, and the measurement error is large. A device and method for measuring, the device and method can accurately measure the diameter of dense tube bundles and the thickness of oxide film at any position in the full stroke on site, and the measurement is efficient, safe and reliable

Method used

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  • Device and method for measuring diameter of dense pipe bundle and thickness of oxide film on site
  • Device and method for measuring diameter of dense pipe bundle and thickness of oxide film on site
  • Device and method for measuring diameter of dense pipe bundle and thickness of oxide film on site

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Embodiment 1

[0034] Such as Figure 1 to Figure 5 As shown, the present invention relates to a device and method for measuring the diameter and oxide film thickness of highly radioactive dense sample tubes on site after nuclear power plants and research reactors are irradiated. The irradiation sample tube bundle is composed of 16 irradiation sample tubes, and the layout corresponds to Figure 4 There are 16 locations on the periphery. In this embodiment, the rod diameter and oxide film thickness are measured for 16 irradiated sample tubes. Its hardware structure includes 8 rod diameter measuring units and 8 oxide film thickness measuring units installed on the measuring bench, which correspond to the structure of the irradiated tube bundle and can be adjusted according to the structure of the irradiated tube bundle. The rod diameter measuring unit are all set in the same horizontal plane, the oxide film thickness measurement units are all set in the same horizontal plane, the oxide film th...

Embodiment 2

[0047] Such as Figure 1 to Figure 5 As shown, this embodiment measures the rod diameter and oxide film thickness for 16 irradiated sample tubes, and the A1B1, A2B2, A3B3, and A4B4 measurement units serve as backups for each other. If a measurement unit fails, the backup measurement can be used through the rotating assembly The unit is detected, which improves the measurement efficiency. That is, when a certain measurement unit breaks down in Embodiment 1, the measurement is implemented as follows:

[0048] Step 1. Same as in Embodiment 1, lift the detection device into the spent fuel pool through four lifting lugs 7, insert the positioning tube 6 into the hole of the spent fuel storage grid assembly, and place the main support plate on the spent fuel storage grid.

[0049] Step 2, the same as in Example 1, insert a standard rod in advance, measure the value through the rod diameter measurement unit and the oxide film thickness measurement unit, as a standard value, use the nuc...

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Abstract

The invention discloses a device and a method for measuring the diameter of a dense pipe bundle and the thickness of an oxide film on site. The device comprises a plurality of rod diameter measurement units and a plurality of oxide film thickness measurement unit which are mounted on a measurement rack, wherein the rod diameter measurement units are all arranged in the same horizontal plane; the oxide film thickness measurement units are all arranged in the same horizontal plane; a channel, through which a sample supply pipe passes, is arranged inside each of each rod diameter measurement unit and each oxide film thickness measurement unit; the channel of each rod diameter measurement unit is correspondingly coaxial with the channel of each oxide film thickness measurement unit. By classification of the dense pipe bundle, the device can directly and precisely measure the diameter of the dense pipe bundle and the thickness of the oxide film at any position in the whole stroke on the site; in the measurement process, direct contact with a human body is avoided; a sensor is configured to measure tiny changes of the diameter and the thickness of the oxide film, so that the detection is safer, more efficient and more reliable; in case of failure of a certain measurement unit, the device still can complete the measurement work.

Description

technical field [0001] The invention belongs to the technical field of nuclear industry detection, and in particular relates to a device and method for on-site measurement of the diameter of a dense tube bundle and the thickness of an oxide film. Background technique [0002] In the development process of a fuel rod material, different types of zirconium alloy materials are prepared into sample tube bundles similar to burnable poisons and inserted into the fuel assembly for irradiation test. After several test cycles, it is necessary to measure the size of the sample tube bundle after irradiation Small changes, such as small changes in diameter and oxide film thickness. [0003] The sample tube bundle is composed of 16 3m slender test sample tubes and several short rods, and only the upper end is fixed in relative position, the arrangement is relatively dense, and the lower end is free. It is like a wind chime in the water, and it can be measured at any position in the full ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/017
CPCG21C17/017Y02E30/30
Inventor 王万金李成业江林志任亮吴瑞伍晓勇李子彦王立德邹德光罗文广偶建磊吴伟郑海川段志强孙志军
Owner NUCLEAR POWER INSTITUTE OF CHINA
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