Installation method of electrical penetrating parts of steel containment in nuclear power plant
A technology for electrical penetrations and steel containment, which is applied in the construction field of nuclear power plants, can solve the problems of many welding defects and the inability to release and eliminate stress in time.
Active Publication Date: 2019-07-23
CHINA NUCLEAR IND FIFTH CONSTR CO LTD
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Problems solved by technology
[0007] In order to solve the problem of many welding defects caused by welding during the installation of electrical penetrations in third-generation nuclear power plants, the inventors found that: in the prior art, after all the welding work is completed, heating devices such as electric heaters are used to The two welds formed by welding are heat treated at the same time, resulting in a large number of welding defects in the weld because the stress generated during the welding process cannot be released and eliminated in time
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[0024] Below, take the AP1000 nuclear power plant steel containment electrical penetration as an example, combined with figure 1 with 2 , the installation method of the steel containment electrical penetrating piece of the nuclear power plant of the present invention is described in detail, as follows:
[0025] Set up a hollow bracket on the ground to support the insert plate, then insert the sleeve vertically into the sleeve installation hole on the insert plate and combine it with the inner edge groove of the insert plate to form a K-shaped groove, and assemble The formed pair gap is 3-5mm. In this way, it is convenient to assemble the sleeve and the insert plate, and the K-shaped groove formed by the pair is located in the horizontal plane, which is convenient for the subsequent welding construction to be completed by flat welding. Compared with hoisting on the steel containment cylinder Welding is carried out at the mounting holes of electrical penetration parts, which r...
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The invention relates to the field of construction of nuclear power plants and particularly relates to an installation method for an electrical penetration assembly of a steel containment vessel in the nuclear power plant. In order to solve the problem of more welding defects caused by welding in the installation process of the electrical penetration assembly in the nuclear power plant, the invention provides the installation method for the electrical penetration assembly of the steel containment vessel of the nuclear power plant. The installation method comprises the following steps: inserting a sleeve into a sleeve installation hole in an insertion plate, and assembling to form a K-type groove, wherein the assembling gap is 3-5 mm; preheating the periphery of the K-type groove, conducting central symmetry type welding on the K-type groove through manual arc welding and automatic gas metal arc welding, conducting post-weld heat treatment in a heating furnace after finishing welding; hoisting the electrical penetration assembly in an installation hole of the electrical penetration assembly, and assembling to form a double groove, wherein the assembling gap is 0-10 mm; and conducting central symmetry type welding on the double groove through the manual arc welding, conducting post-weld heat treatment according to the design requirement, and finishing installation. The installation method has good welding effects and fewer defects.
Description
technical field [0001] The invention relates to the construction field of nuclear power plants, in particular to a method for installing electrical penetrations on steel containment vessels in AP1000 / CAP1000 / CAP1400 nuclear power plants. Background technique [0002] In a nuclear power plant, the electrical penetration is composed of a sleeve 1 and an annular insert plate 3 connecting the sleeve 1 and the steel containment shell 2, such as figure 1 shown. [0003] At present, when installing electrical penetrations, the insertion plate 3 is first installed in the installation hole of the electrical penetrations on the steel containment cylinder 2 according to the order of arrival of the components, and the insertion plate 3 is welded by manual argon arc welding. Weld the double-sided groove formed by the cylinder wall group of the steel containment cylinder 2; then insert the sleeve 1 into the sleeve installation hole on the insertion plate 3, and use manual argon arc weldi...
Claims
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IPC IPC(8): G21C21/00B23K28/02
CPCB23K28/02G21C21/00Y02E30/30
Inventor 史晓路相军颜廷海甘小马王琳李君张剡功谭思
Owner CHINA NUCLEAR IND FIFTH CONSTR CO LTD