Nuclear power plant neutron flux instrument refers to the special probe for casing eddy current detection

Abstract

The invention relates to a special probe for eddy current detection of the bushing of a neutron flux meter used in a nuclear power plant, which is used for eddy current detection of the bushing of a neutron flux meter used in a nuclear power plant. The copper sleeve, the coil bobbin set in the copper sleeve, the coil wound on the coil bobbin, and the spring tube connected to the other end of the copper sleeve; the coil is connected with a cable, and the coil bobbin is fixedly connected with a steel wire rope, and the cable and the steel wire rope pass through The clamp is fixed and passed through the copper sleeve and the spring tube. There is an empty slot on the wall of the copper sleeve, and the slot is filled with glue. The tail of the wire rope is fixedly connected with the tail of the spring tube, and the tail of the cable is connected with a connector. The special probe of the present invention can provide sufficient thrust in the narrow and elongated curved channel and has strong durability, and can safely and reliably realize the in-service eddy current inspection of the nuclear power plant finger casing.

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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