Clogged Hand Holes of Vertical Steam Generators in Nuclear Power Plants

Abstract

The invention discloses a hand hole blockage of a vertical steam generator in a nuclear power plant, which comprises: a hollow ball shaft seat, one side of the ball shaft seat is connected with a stud through a screw connection; The ball shaft, the ball shaft is installed on the opposite side of the ball shaft seat and the stud, the ball shaft is sequentially provided with a connecting rod fixedly connected to the ball shaft, a connecting rod fixedly connected to the connecting rod, and a connecting rod fixedly connected to the connecting rod The blockage away from the end of the connecting rod. Compared with the prior art, the hand hole plugging structure of the vertical steam generator of the nuclear power plant of the present invention is simple, adjustable, light in weight, easy to install and does not require special tools, and can ensure the descending channel and the ascending channel of the vertical steam generator of the nuclear power plant isolation.

Description

Technical field [0001] The present invention belongs to the technical field of nuclear power, and more particularly, the present invention relates to one kind of a hand hole of the steam generator of nuclear power plants vertical clogging. Background technique [0002] It is a nuclear power plant steam generator, the secondary circuit hub, the heat for the reactor water is transferred to the secondary side of the steam generation and, after water separation after passing quality steam is sent to the steam turbine driven generator to produce electricity and . [0003] In order to facilitate repair of the steam generator tube sheet of a secondary side, usually on the lower tube plate from the barrel of the steam generator hand hole is provided at a distance from the position of the hand apertures is disposed generally 0 degrees, 90 degrees, 180 degrees and 270 Spend. When maintenance shutdown, the sludge can be flushed through the secondary tube sheet apertures hand, the video insp...

AI Technical Summary

Problems solved by technology

[0005] The main defects of this technical solution are: the structure is complicated, the shell needs to be designed with a special structure, and it is relatively difficult to manufacture; the spring is made of special materials, and the production cost is high; Large deviations, may cause the entire hand hole to be blocked and cannot be installed, and require special tools to install or remove

[0007] The main defect of this technical solution is: the weight of the whole hand hole blocking component is about 15 kg, which is not convenient for personnel to install and disassemble; the nut is anti-loosening by using the bent lock washer structure, and special tools are required for disassembly and assembly, and the hand hole space Small and inconvenient to operate; the threaded connection part may be rusted and stuck after long-term operation, resulting in the hand hole being blocked and unable to be disassembled

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