Nuclear power plant equipment gate connection fastening structure and its fastening method

Abstract

The invention discloses a connection and fastening structure for a nuclear power plant equipment gate, which comprises a cylinder flange, which is fixedly connected with a penetrating sleeve pre-buried on the containment wall; a head flange, which is fixedly connected with the gate head; It is characterized in that the corresponding positions of the cylinder flange and the head flange are provided with a plurality of "U"-shaped through holes opening outwards along the circumference. After the cylinder flange and the head flange are butted, the joint bolt assembly fastening; wherein, the swing bolt assembly includes a detachable swing bolt, an external nut and an adjustable washer sleeved on the swing bolt to prevent the external nut from being stuck. Compared with the prior art, the connection and fastening structure of the equipment gate of the nuclear power plant of the present invention can quickly realize the opening and closing of the equipment gate, and solve the problem that some bolts cannot be installed due to the deformation of the sleeve flange caused by the civil prestress. And it can avoid damage to the bolt holes of the equipment itself. In addition, the invention also provides a fastening method.

Description

technical field [0001] The invention belongs to the field of nuclear power, and more specifically, the invention relates to a connection and fastening structure for a gate of nuclear power plant equipment and a fastening method thereof. Background technique [0002] The equipment gate is located on the reactor containment of the nuclear power plant, and its main function is to serve as an access channel for large-scale equipment (such as steam generators, etc.) in the reactor building during the construction of the nuclear power plant and the shutdown and refueling period. During the operation of the nuclear power plant and in the accident state, the equipment gate is closed, and together with the reactor containment shell, it forms the third barrier to prevent the leakage of radioactive materials, which is a part of the pressure boundary of the containment shell. [0003] The main structure of the equipment gate in the prior art is a steel butterfly head. When it is closed,...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the invention is to overcome the deficiencies of the prior art, provide a nuclear power plant equipment gate connection fastening structure and its fastening method, improve the gate opening and closing efficiency, solve the defect that the bolt cannot be installed due to sleeve deformation, and avoid Irreplaceable defects due to thread damage

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