Method for hoisting southwest wall of in-containment refueling water storage tank of nuclear power station

Abstract

The invention provides a method for hoisting a southwest wall of an in-containment refueling water storage tank of a nuclear power station. The method is characterized by comprising the following steps of before the southwest wall of the in-containment refueling water storage tank is hoisted, respectively hanging one end of each of two cables to one of two lifting lugs arranged on tops of two ends of the southwest wall of the in-containment refueling water storage tank; determining a reasonable hoisting radius which enables the southwest wall of the in-containment refueling water storage tank to be hoisted in through a ring lifting beam on the top of a fourth ring of a steel containment vessel (CV) by using computer-aided design (CAD) drawing in advance; determining a hoisting radius of a large crane, which enables the southwest wall of the in-containment refueling water storage tank to be hoisted in between a second-ring reinforcing ring of the steel CV and a mounted module in a reactor plant of a nuclear island by using CAD drawing in advance, namely the hoisting radius of the crane is changed into a hoisting radius A3 and the southwest wall of the in-containment refueling water storage tank is hoisted in position. The method for hoisting a CA03 module into the reactor plant of the nuclear island through the top of the fourth ring of the CV is good in economy, safe, reliable and good in using effect.

Description

technical field [0001] The invention relates to a method for hoisting the southwest wall of the built-in refueling water tank (hereinafter referred to as the CA03 module) into the nuclear island reactor building by the top of the four rings of the steel containment vessel (hereinafter referred to as the CV). Background technique [0002] In nuclear power plants, such as figure 1 The CA03 module 1 shown is a steel structure wall module, which is the southwest wall of the built-in refueling water tank. It is in the shape of a semicircle, with a chord length of about 35.5m, an arc height of about 14m, and a vertical height of about 13m. The CA03 module is assembled on the heavy-duty road near the nuclear island. After the module assembly is completed, the CA03 module is hoisted from the assembly site to the reactor building 2 of the nuclear island with a large crane and installed in place. The total weight of the module is 201.6t when hoisting. [0003] combine Figure 2A and...

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Problems solved by technology

[0005] Second, the CA03 module 1 needs to be hoisted from the top of the CV fourth ring. However, when the CA03 module 1 is hoisted, the ring crane track beam 3 with a width of 1118mm has been installed on the CV fourth ring, and the CA03 module 1 cannot be directly above the position. Lifting from the top of the CV four rings

[0007] Fourth, when the top of CA03 module 1 falls back below CV second ring reinforcement ring 4, it is necessary to adjust the hoisting radius of the large crane, and hoist CA03 module 1 to the in place position. When in place, the distance between CA03 module 1 and CV cylinder The minimum clearance is about 87mm, this process is prone to collision between CA03 module 1 and CV cylinder

[0008] Fifth, there are errors in the calculation of the center of gravity of CA03 module 1 and the position of the lifting lug. If the module is too inclined, the gap between CA03 module 1, the ring suspension track beam 3, and the CV second ring reinforcement ring 4 will be reduced, and the in-position of CA03 module 1 will be increased. difficulty

CA03 module 1 has elastic deformation during the hoisting process, which will change the gap between CA03 module 1 and the hoisting track beam 3 and CV second ring reinforcement ring 4, increasing the difficulty of module placement

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