Mounting method for insulating layer of nuclear reactor pressure vessel

Abstract

The invention relates to a mounting method for an insulating layer of a nuclear reactor pressure vessel. In order to optimize the whole nuclear island mounting construction period, in the mounting method, a connecting ring, a hanging bracket, a channel steel ring, a barrel insulated board, and the like are assembled into a prefabricated whole, and the prefabricated whole is hung on a reactor shaft; then a pressure vessel is hung; accessories in the process of mounting are disassembled, and proper adjustment is carried out, wherein when the pressure vessel is arranged, the mounting work of a barrel insulating layer can be finished in one day, and compared with the time of nine days in a scheduled plan of the prior art, the mounting method saves eight days. In the mounting method, the hanging ring can avoid being operated with heavy load repeatedly for a long time, thereby reducing the probability of ring hanging accidents. The pressure vessel and the insulating layer also can avoid being hung in and out of the reactor shaft for many times, thereby reducing the probability of damage of the outer surface of the insulating layer.

Description

technical field [0001] The invention relates to the installation of basic equipment in a nuclear power plant, and relates to a method for installing an insulating layer of a pressure vessel of a nuclear reactor. Background technique [0002] In the "Reactor Pressure Vessel Insulation Layer Equipment Specifications" (published by China Nuclear Power Research and Design Institute, 2004-09-15), it is stipulated: "The cylinder insulation layer should be located on the support of the pressure vessel, and the ring should be used after the adjustment is qualified. Lift it up and install it vertically from top to bottom, and after the insulation layer is installed, put the pressure vessel back on the support.” [0003] Taking the second phase project of Ling'ao nuclear power plant of Guangdong Nuclear Power Group as an example, according to the above requirements, in the "three-level plan for nuclear island installation" of the second phase of Ling'ao nuclear power plant, the constr...

AI Technical Summary

Problems solved by technology

[0024] 1) The installation and construction of the insulation layer of the pressure vessel cylinder occupies a long time on the critical path of the nuclear island installation. According to the usual schedule, it takes 9 working days, which will affect the completion time of the pressure vessel installation

[0025] 2) The ring crane used in the installation process needs to be operated for a long time with multiple heavy loads (the net weight of the pressure vessel is 256.6 tons), and the probability of unsafety increases

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