An automatic measuring device for radial support key assembly clearance

Abstract

The invention belongs to the technical field of the design of a nuclear reactor of a pressurized water reactor nuclear power plant, and particularly relates to an automatic measuring device for the assembly clearance of a radial support key. The automatic measuring device for the assembly clearance of the radial support key comprises a probe, a camera, a horizontal telescopic support, a vertical telescopic support and an installation platform. The camera is installed on one side of the probe. The other side of the probe is connected with the front end of the horizontal telescopic support. The rear end of the horizontal telescopic support is connected with the upper end of the vertical telescopic support. The lower end of the vertical telescopic support is connected with the installation platform. The automatic measuring device for the assembly clearance of the radial support key has the advantages of automatic measurement and high precision. A data acquisition device is controlled outside a pressure container so that the probe can be moved to measure the assembly clearance between different positions of the radial support key and a reactor core support block and the assembly clearance between the different positions of the radial support key and an insert of the radial support key; in this way, defects of manual measurement conducted by operation personnel in the prior art are overcome, and the limitation that the operation personnel must enter the pressure container to conduct measurement is avoided.

Description

technical field [0001] The invention belongs to the technical field of nuclear reactor design in pressurized water reactor nuclear power plants, and in particular relates to an automatic measuring device for radial support key assembly gaps. Background technique [0002] The nuclear reactor internals are designed with 4 sets of core lower support structures arranged at 90 degrees, which are respectively composed of a radial support key, a core support block and two lower radial support inserts. The radial support key is matched with the insert on the core support block, and a certain assembly gap is reserved. This assembly gap is very important for limiting the rotation and / or translation of the lower end of the basket cylinder, and for transferring horizontal loads during thermal expansion. role. Therefore, the accuracy of the assembly gap between the radial support key and the insert is very high, and too large or too small an assembly gap will directly affect the install...

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Problems solved by technology

[0005] (2) The manual measurement of the assembly clearance is also one of the reasons why the manholes in the lower plate of the core support must be preserved, and the vicinity of the manholes is a stress concentration area, which reduces the safety margin of the equipment

[0006] (3) Due to the limited operating space of the operator when measuring, it is difficult to guarantee the measurement accuracy of certain positions and angles, which brings human error

[0007] (4) During the later period of maintenance and replacement, since there is already radiation in the pressure vessel and the internal components of the reactor, it is not conducive to the manual measurement of the operator

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