Sampling method for quality detection of entire top cover forging of reactor pressure vessel

Abstract

The invention provides a sampling method for quality detection of entire top cover forgings of reactor pressure vessels. The sampling method includes: first pre-designing chemical composition analysis positions and sulfur print inspection regions of the entire forging surface before cutting; then performing inner-hole nesting sampling from preset installation holes of an end closure portion and bolt holes of a flange portion of the entire top cover forging; and cutting to obtain an inside test ring, a connection area test ring, a maximum damage zone test ring and a dome center test block from the entire top cover forging and cutting samples therefrom respectively. The sampling method of the present invention not only can inspect the overall quality of the entire top cover forging of the reactor pressure vessel and perform a complete assessment for the manufacturing process of the entire top cover forging in line with the procedure qualification requirements of the RCC-M nuclear power specification, but also does not require complete destruction of the entire top cover forging, so the flange portion still can be used as a flange product after sampling, thereby reducing the cost of sampling.

Description

technical field [0001] The invention relates to the technical field of reactor pressure vessels, in particular to a sampling method for quality inspection of integral top cover forgings of reactor pressure vessels. Background technique [0002] At present, the world has entered a new round of nuclear power development. Many countries are actively preparing to build new nuclear power units. However, the production capacity of large-scale castings and forgings in nuclear islands around the world is very limited, and the manufacturing technology is mainly controlled in a few. In the manufacturing plant, this can no longer meet the needs of the development of nuclear power all over the world. Combined with our country's policy of developing nuclear power and the localization of nuclear power equipment, to achieve the goal of my country's nuclear power development plan, it is necessary to realize the localization of the overall top cover forging of the reactor pressure vessel. I...

AI Technical Summary

Problems solved by technology

[0016] In the process of forming two heads with greatly different thicknesses, it is easy to cause damage to the joint between the thinner head part and the thicker flange part;

[0017] The overall quality of forgings is not easy to check, and it is difficult to take samples from non-standard sampling parts

Images