Transportation turnover mechanism used for reactor pressure vessel of high temperature gas-cooled reactor nuclear power plant

Abstract

The invention relates to a transportation turnover mechanism used for a reactor pressure vessel of a high temperature gas-cooled reactor nuclear power plant and belongs to the technical field of nuclear power project construction. The transportation turnover mechanism comprises two main girders, a plurality of connecting crossbeams, a terminal crossbeam, a saddle seat and supporting seats; the connecting crossbeams and the terminal crossbeam are welded between the two main girders to form a framework; the terminal crossbeam is fixed on the end of a bended section of the framework and is provided with a stopping bolt; a hoisting lug is arranged on the end of a straight section of the framework; the saddle seat is welded to the connecting crossbeams; the supporting seats are symmetrically welded to the main girder. The transportation turnover mechanism can simultaneously satisfy transportation and turnover demands of the RPV in the high temperature gas-cooled reactor nuclear power plant,can significantly reduce security risk of hoisting, and has important significant of improving hoisting technical level of the high temperature gas-cooled reactor nuclear power plant and promoting commercial promotion of the high temperature gas-cooled reactor. The mechanism also has promotion and application value in hoisting of other large-size long-cylindrical vessels in other nuclear power reactors and other engineering technologies.

Description

technical field [0001] The invention relates to a transport turning mechanism for a reactor pressure vessel of a high-temperature gas-cooled reactor nuclear power plant, and belongs to the technical field of nuclear power engineering construction. Background technique [0002] The high-temperature gas-cooled reactor nuclear power demonstration project is one of the 16 major national projects. The new type of nuclear reactor with the main characteristics of the fourth-generation nuclear energy system has received extensive attention in the world. The reactor pressure vessel is an important part of the pressure boundary of the coolant in the primary circuit of the reactor. It consists of two parts: the cylinder and the top cover. The largest single piece of equipment, RPV, is difficult to transport, turn over and hoist, and has high safety risks, which have an important impact on the critical path of the construction of the entire nuclear power project. [0003] The built pre...

AI Technical Summary

Problems solved by technology

The reactor pressure vessel is an important part of the pressure boundary of the coolant in the primary circuit of the reactor. It consists of two parts: the cylinder and the top cover. The largest single piece of equipment, the transportation, turning and hoisting of RPV is difficult and has a high safety risk, which has an important impact on the critical path of the entire nuclear power project construction

[0003] The built pressurized water reactor nuclear power RPV is placed on two special transport saddles for transportation. After arriving at the site, it is unloaded by a large crane and placed horizontally on a special "V"-shaped flip bracket, and then the RPV is turned upright from the horizontal state and hoisted. The two devices of transporting the saddle and the "V"-shaped flip bracket increase the cost and the construction risk of RPV unloading; the RPV of the high-temperature gas-cooled reactor nuclear power demonstration project is transported to the site in a horizontal state, and it is hoisted to a certain height by two large cranes After that, flip upright in the air

Due to the large weight and volume of RPV, there are high safety risks of instability and equipment quality control risks during the flipping process

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