Probe special for performing eddy current testing on thimble tube of neutron flux instrument used by nuclear power plant

Abstract

The invention relates to a probe special for performing eddy current testing on a thimble tube of a neutron flux instrument used by a nuclear power plant. The probe is used for performing eddy current testing on the thimble tube of the neutron flux instrument used by the nuclear power plant, and comprises a seeker, a copper bush having one end connected with the seeker, a coil framework arranged in the copper bush, a coil wound on the coil framework, and a spring tube connected with the other end of the copper bush, wherein the coil is connected with a cable; a steel wire rope is fixedly connected with the coil framework; the cable and the steel wire rope are fixed by a cable clamp and penetrate the copper bush and the spring tube; an empty slot part is formed in the wall of the copper bush and is filled with glue; the tail part of the steel wire rope is fixedly connected with the tail part of the spring tube; and the tail part of the cable is connected with a connector. According to the probe special for performing eddy current testing on the thimble tube of the neutron flux instrument used by the nuclear power plant, the enough thrust can be supplied in a narrow and slender curved channel, the durability is extremely strong, and the in-service eddy current testing on the thimble tube of the nuclear power plant can be realized safely and reliably.

Description

technical field [0001] The invention relates to a probe used for eddy current testing of the bushing of a neutron flux instrument used in a nuclear power plant. Background technique [0002] Eddy current testing technology is one of the non-destructive testing methods in industry. Based on the principle of electromagnetic induction, it can detect surface and near-surface defects of conductive materials. The coil does not need to be in direct contact with the object to be tested during detection, which enables high-speed detection and is easy to automate. [0003] As the neutron measurement channel of the core, the bushing is prone to wear and other defects under long-term operation and irradiation environment. When defects such as wear and tear develop to a certain extent, once damage or leaks occur, high-temperature, high-pressure boron-containing water containing radioactivity will enter the finger sleeve, resulting in radioactive leakage and pollution. In order to ensu...

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Problems solved by technology

In addition, the material of the cable protection tube used should not be too hard or too soft. If it is too hard, it will not pass through the bend area, and if it is too soft, it will not be able to provide enough thrust. At the same time, the service life of the probe is also a factor that must be considered.

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