GB/T 51323-2018 in English

Standard Overview and Technical Background

This standard is formulated in accordance with the 2015 revision plan of the Ministry of Housing and Urban-Rural Development for engineering construction standards and specifications, and is intended to ensure the safe operation of nuclear power plants throughout their life cycle. The drafting team has formed a technical system consisting of 11 chapters and 3 appendices through extensive research, practice summary and reference to international standards, focusing on the core contents such as general principles, detection methods, structural analysis, and appraisal rating.

Analysis of key technical contents

Identification procedures and implementation points

1. Preliminary investigation: Collect design drawings, completion data and historical maintenance records
2. Detailed inspection: Use ultrasonic, infrared and other technologies to locate defects
3. Seismic assessment: Calibrate according to SL-1/SL-2 seismic motion parameters
4. Life extension analysis: Establish a time-varying model of material properties

Suggestions for the implementation of the standard

• Establish digital inspection files to predict degradation trends
• Use the absolute pressure method to improve the accuracy of the containment sealing test
• Incorporate environmental corrosion monitoring into the preventive inspection program