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All Main Coolant Piping Modules of Unit 1 at China's Guangdong Taipingling Nuclear Power Project in Place

　　According to reports, on September 29, all main coolant piping modules of the nuclear island of Unit 1 at China's Guangdong Taipingling Nuclear Power Project were hoisted and installed in place. The main coolant piping is known as the "main artery" of the reactor, used to connect the reactor pressure vessel, steam generators and reactor coolant pumps, providing a circulation channel for the primary coolant, and is classified as nuclear safety Class 1 and seismic Category I equipment. The main coolant system of the Hualong One reactor consists of three loops, connecting the three major main equipment into a closed loop through the main coolant piping, and is an important part of the primary pressure boundary.　　The completion of all installations in place means that the installation of the core major components of the nuclear island is basically completed. The hoisting and installation of the main coolant piping requires precise control of pipe section angles and center-of-gravity positions within a confined space...

2026-10-01

Main Coolant Piping Welding of Lufeng Nuclear Power Unit 6 Successfully Completed

On September 28, the main coolant piping welding of the nuclear island of Lufeng Nuclear Power Unit 6 was successfully completed. All non-destructive testing of the main coolant piping was finished, with the first-pass qualification rate of radiographic testing (RT)/ultrasonic testing (UT) reaching 100%, laying a solid foundation for subsequent key milestones such as nuclear loop flushing and cold functional testing. Facing the high standards of main coolant piping welding, the project department strictly implemented nuclear safety supervision and control requirements, carried out precondition verification across all dimensions of personnel, machines, materials, methods, and environment, established a main coolant piping welding control zone, strictly controlled the working environment including temperature, humidity, and cleanliness, and ensured stable and controllable welding conditions. The project team fully drew on the main coolant piping welding experience of Unit 5, formulated a special plan and implemented full-process management, and through digital monitoring means throughout the entire welding process, tracked key parameters such as welding deformation and temperature in real time, refined the process disclosure, in-process inspection, and quality acceptance procedures for each weld joint, and applied the work style of "strict, cautious, meticulous, and pragmatic" to every welding operation and every weld seam, ensuring the successful completion of the main coolant piping welding of Unit 6.

2026-09-30

South Korean research team evaluates pipe rupture risk in nuclear power plants using probabilistic analysis

Researchers from Seoul National University of Science and Technology in South Korea have recently proposed a sensitivity analysis method based on probabilistic fracture mechanics to evaluate the rupture frequency of main coolant piping systems in nuclear power plants. This method can analyze the impact of uncertainties and modeling assumptions on prediction results, helping engineers distinguish extremely low-probability events from relatively more likely failure scenarios. In nuclear power plants, the main coolant piping system plays a critical role in maintaining structural integrity under normal reactor operating conditions. A pipe rupture could trigger a loss-of-coolant accident, and therefore this system has long been included in the key scope of nuclear power plant safety design and assessment.

2026-08-28

All non-destructive testing of the nuclear island main coolant piping and surge lines for Haiyang Nuclear Power Units 3 and 4 has passed inspection.

Recently, the Haiyang Nuclear Power Project—undertaken by China Nuclear Industry Fifth Construction Co., Ltd. (CNI5)—achieved another milestone: the final weld joint of the Unit 4 surge line passed ultrasonic testing (UT). This marks the successful comple

2026-07-27