Installation method for electrical penetration assembly of steel containment vessel of nuclear power plant

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 p