Measuring method for scale deposit thickness on external wall of heat transferring pipe based on eddy current testing signals

Abstract

The invention relates to a measuring method for scale deposit thickness on an external wall of a heat transferring pipe based on eddy current testing signals; the method comprises the following steps: 1, acquiring impedance change vector signals of calibration sludge; 2, normalizing signals; 3, making a calibration quantified curve; 4, acquiring actual signals; 5, processing structural signals; 6, applying the calibration quantified curve to perform sludge thickness quantification on the actual signals. The measuring method satisfies the requirement of monitoring the scale deposit thickness on the external wall of the heat transferring pipe of a vapor generator in a nuclear power plant in China; by adopting the method, the distribution situation and the whole quality of the scale deposit of the whole vapor generator can be measured.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant operation, in particular to a method for measuring the scale thickness of the outer wall of a heat transfer tube based on eddy current detection signals. Background technique [0002] With the continuous operation of the nuclear power plant, sludge accumulation and scaling on the outer wall of the heat transfer tube exist on the secondary side of the steam generator. Sludge and scaling not only have an impact on the heat transfer tube itself such as corrosion, serious sludge accumulation will directly affect the heat transfer efficiency and life of the steam generator. [0003] The steam generator heat transfer tube is a key component of the integrity of the pressure boundary of the primary circuit of a nuclear power plant. Any factors that affect its safety must be strictly monitored. Due to the inaccessibility of the secondary side, visual inspection and other methods cannot be used ...

AI Technical Summary

Problems solved by technology

In addition to the corrosion of the heat transfer tube itself caused by sludge and scaling, serious sludge accumulation will directly affect the heat transfer efficiency and life of the steam generator

[0003] The heat transfer tube of the steam generator is a key component of the integrity of the pressure boundary of the primary circuit of the nuclear power plant. Any factors that affect its safety must be strictly monitored. Due to the inaccessibility of the secondary side, visual inspection and other methods cannot be used for detection

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