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Judgment method and judgment system for inter-crystal stress corrosion of nuclear power plant vapor generators

A technology of a steam generator and a determination method, which is applied in the field of nuclear power, can solve problems such as the failure of the detected device, and achieve the effect of reducing the risk of failure

Inactive Publication Date: 2017-12-12
LINGDONG NUCLEAR POWER +5
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a method and system for judging intergranular stress corrosion of steam generators in nuclear power plants. Corrosion defects, which in turn put the tested device at risk of failure

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  • Judgment method and judgment system for inter-crystal stress corrosion of nuclear power plant vapor generators
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  • Judgment method and judgment system for inter-crystal stress corrosion of nuclear power plant vapor generators

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0029] In the embodiment of the present invention, by calibrating the voltage amplitude and detecting the eddy current signal of the tube to be tested, the eddy current amplitude trend line, eddy current phase trend line, and wound depth trend line of the tube to be tested are obtained, and then the voltage of the eddy current amplitude trend line is obtained. The magnitude of the amplitude, the successive change trend of the phase angle and the successive change trend of the damage depth are used to determine the defect, so as to accurately determine whether there is an intergranular stress corrosi...

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Abstract

The invention is applicable to the technical field of nuclear power, and provides a judgment method and a judgment system for inter-crystal stress corrosion of nuclear power plant vapor generators. The judgment method and the judgment system have the advantages that vortex amplitude trend lines, vortex phase trend lines and wound depth trend lines of to-be-detected tubes are acquired through calibration of voltage amplitudes and vortex signal detection of the to-be-detected tubes, and defect types are judged according to the voltage amplitudes of the vortex amplitude trend lines, successive change trends of phase angles and successive change trends of wound depths, so that whether or not the to-be-detected tubes have inter-crystal stress corrosion defects is judged accurately, and failure risks of heat transfer tubes of the vapor generators are reduced.

Description

technical field [0001] The invention belongs to the technical field of nuclear power, and in particular relates to a method and system for judging intergranular stress corrosion of steam generators in nuclear power plants. Background technique [0002] The steam generator is one of the key equipment of the pressurized water reactor power plant in the nuclear power plant. The corrosion defects of the evaporator, especially the local corrosion and thinning of the heat transfer tube, etc. are the main reasons for the reduction of its pressure bearing capacity and rupture. The rupture of the heat pipe will lead to a series of safety problems such as emergency shutdown. Therefore, it is necessary to determine whether there is corrosion in the evaporator in time and analyze the type of corrosion defects. [0003] The existing intergranular stress corrosion detection method usually uses a differential coil to detect intergranular corrosion defects. However, since the microscopic pe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
Inventor 陈军郑超雄阳立范岩成李平仁孔晨光
Owner LINGDONG NUCLEAR POWER