NB/T 20481-2018 in English

This standard provides detailed guidelines for the design and manufacturing of the reactor coolant main pipe in pressurized water reactor nuclear power plants. It outlines the necessary technical requirements, material specifications, and quality control measures to ensure the structural integrity and operational safety of the main pipe. The document covers various aspects such as material selection, welding procedures, non-destructive testing, and dimensional tolerances. It also includes specific requirements for the fabrication and assembly processes to meet the stringent safety and performance standards applicable to nuclear power plant components. The standard is intended to serve as a reference for engineers and manufacturers involved in the construction of such critical systems.