Optical fiber LIBS detection device and method used in main pipeline of nuclear power plant

Abstract

The invention discloses an optical fiber LIBS(Laser Induced Breakdown Spectroscopy) detection device and a method used in a main pipeline of a nuclear power plant. The device comprises two parts of afiber LIBS detector and a master control detection system. The master control detection system is installed in a mater control room of the nuclear power plant, and the optical fiber LIBS detector enters the pipeline for detection, wherein the two parts are connected through transmission optical fibers and control signal lines. The master control detection system and the optical fiber LIBS detectorare connected through the high temperature resistant high-power transmission optical fibers and control signal lines, so that a remote online detection for a fixed point can be performed on a designated area of the inner wall of the main pipeline in the main control room of the nuclear power plant; the to-be-detected pipeline does not need to be pretreated, so that the inner wall of the pipelineis slightly damaged or even undamaged; and multiple elements can be rapidly and quantitatively analyzed at the same time, and the whole detection process is safe and reliable in operation and high inefficiency.

Description

【Technical field】 [0001] The invention belongs to the technical field of laser diagnosis, and relates to an optical fiber LIBS detection device and method used in a main pipeline of a nuclear power plant. 【Background technique】 [0002] The status monitoring, maintenance and evaluation technology of the key structure of the reactor is an important support for the safety and economy of nuclear power. Conduct in-service and pre-service non-destructive testing. Due to the harsh operating environment of nuclear power plants such as high radioactivity, high temperature, and high pressure, conventional detection methods, such as X-ray photography technology, ultrasonic technology, and eddy current technology, are difficult to achieve long-distance online measurement. The newly developed remote online detection technologies such as acoustic emission technology and electrochemical technology also have their own limitations: for example, acoustic emission technology can only detect ...

AI Technical Summary

Problems solved by technology

Due to the harsh operating environment of nuclear power plants such as high radioactivity, high temperature, and high pressure, conventional detection methods, such as X-ray photography technology, ultrasonic technology, and eddy current technology, are difficult to achieve long-distance online measurement

The newly developed remote online detection technologies such as acoustic emission technology and electrochemical technology also have their own limitations: for example, acoustic emission technology can only detect the pressure wave signal emitted by the material being damaged, and cannot evaluate and predict its life ; Electrochemical technology needs to add small-amplitude electrical signal disturbance to the nuclear power system, which may cause adverse effects on the system

At present, my country has not yet established a laser-induced spectral database for nuclear power plant steel and quantitative measurement methods for its elemental components.

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