Ultrasonic detection method for nuclear power plant containment concrete defects

Abstract

The invention belongs to the technical field of building construction quality control of nuclear power plants, and in particular relates to a nondestructive detection method for ultrasonic detection of nuclear power plant containment concrete defects. The method includes the following steps: (1) preparation before detection; (2) the arrangement of measure points, to be more specific, inner wall measure points are arranged by first measurement of actual arc length of a containment inner wall detection area, then equal division of the arc length and drawing of equidistant grids; the outer wall measure points are arranged, the outer wall measure point position and the inner wall measure point position are in the same engineering elevation, the outer wall measure points are on straight lines determined by the inner wall measure points and the centers of circles, and the inner wall measure points pass through the concentric circles; (3) data measurement and save, to be more specific, according to the serial number sequence, two energy transducers are respectively arranged on corresponding measure points on the inner side and the outer side of a barrel body for successive measurement and save; (4) data processing, to be more specific, acquired and saved acoustic parameters are processed and analyzed for judging whether abnormal measure points exist; and (5) post processing, to be more specific, repetition measurement and encryption detection of an important focused region is performed on the basis of the above steps.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plant construction quality control, and in particular relates to a non-destructive testing method for detecting defects in nuclear power plant containment concrete by ultrasonic waves. Background technique [0002] At present, in the field of concrete non-destructive testing technology, it is basically carried out according to the method of ultrasonic detection of concrete defects disclosed in the China Engineering Construction Standardization Association standard CECS21: 2000 "Technical Regulations for the Detection of Concrete Defects by Ultrasonic Method". The relative changes of acoustic parameters such as the propagation time (or speed) of the pulse wave in concrete with the same technical conditions, the amplitude of the first wave of the received wave, and the main frequency of the received signal are used to judge the defects in the concrete. [0003] When detecting concrete defects,...

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Invented a special detection method for the quality