Heavy water reactor main pipeline branch pipe connector surfacing repairing structure

Abstract

The invention belongs to the technical field of nuclear power design and running, and particularly relates to a heavy water reactor main pipeline branch pipe connector surfacing repairing structure. The heavy water reactor main pipeline branch pipe connector surfacing repairing structure is characterized by comprising a main pipeline, a pipe base, an adapter and an instrument pipe and further comprising a surfacing layer cover face layer, a surfacing layer third layer, a surfacing layer second layer and a surfacing layer first layer; the upper end of the pipe base is connected to the lower endof the opening position, connected with a branch pipe, of the main pipeline, and the pipe base and the main pipeline are welded through argon arc welding; the upper end of the adapter is connected tothe lower end of the pipe base, and the adapter and the pipe base are welded through argon arc welding; the upper end of the instrument pipe is connected to the lower end of the adapter, and the instrument pipe and the adapter are subjected to all-position automatic welding; and surfacing welding is implemented to the outer surface of the connecting part of the pipe base and the adapter from theinterior to the exterior in the ring direction one by one, totally four layers are subjected to surfacing and are divided into the surfacing layer first layer, the surfacing layer second layer, the surfacing layer third layer and the surfacing layer cover face layer, and for each surfacing layer, welding is conducted to the reducing position of the adapter from the position of a carbon steel pipebase.

Description

technical field [0001] The invention belongs to the technical field of nuclear power design and operation, and in particular relates to a surfacing welding repair structure for branch joints of main pipelines of heavy water reactors. Background technique [0002] The main pipeline of the heavy water reactor is the pressure boundary of the high temperature and high pressure coolant of the primary circuit of the heavy water reactor, and it is the main nuclear safety barrier, and its integrity directly affects the nuclear safety of the heavy water reactor. If the main pipe branch joints break at both ends, the primary circuit of the heavy water reactor will lose coolant, which will introduce the risk of core melting and seriously affect the safe and stable operation of the unit. See the attached figure 1 . [0003] In December 2007 and October 2016, Unit 1 of Qinshan Third Nuclear Power Plant had heavy water leakage from the primary circuit due to cracks in the branch pipe jo...

AI Technical Summary

Problems solved by technology

If the main pipe branch joints are broken at both ends, the primary circuit of the heavy water reactor will lose coolant, which will introduce the risk of core melting and seriously affect the safe and stable operation of the unit.

Images