Breakthrough in Third-Generation Nuclear Power: First Domestic Main Pump VFD Replacement Completed
Publish Time: 2024-09-27 Origin: Site
The following content is sourced from the official WeChat account of Shandong Nuclear Power Company
On September 24 at 7:08 PM, the Haiyang Nuclear Power Plant 2 successfully completed its fourth refueling overhaul and achieved grid connection. During this maintenance window, Shandong Nuclear Power, in collaboration with Shanghai Nancal Electric and several institutions, completed the first domestic replacement of the main pump VFD for AP1000 units, enabling them to operate at full capacity for extended periods. This achievement enhances the reliability and economic efficiency of the AP1000 units and marks a significant advancement in China's nuclear technology.
To improve the reliability of power supply to third-generation nuclear main pumps, Shandong Nuclear Power teamed up with Shanghai Nancal Electric and various organizations for the development of domestic VFDs. By June 2023, the first prototype was produced, and by November, modifications were made to both Haiyang Plant 1 and 2 to add backup VFDs that automatically switch during failures. By May 2024, these VFDs passed extensive load tests, confirming their capability for long-term operation. This upgrade significantly reduces the risk of operational shutdowns caused by VFD failures, alleviating pressure on the power grid.
Shandong Nuclear Power established a special task force to oversee the project, meticulously documenting every key milestone. Within a year and a half, they advanced through multiple phases of research and testing. As the overhaul began, team members conducted rigorous testing over 120 hours, successfully installing and validating the new domestic VFDs.
Key Advantages of Domestic VFDs
Reliable Performance: Enhanced design and rigorous quality control yield greater stability and reliability.
Rapid Response: VFDs can seamlessly switch online without downtime, minimizing operational impact.
Innovative Design: Specifically engineered to manage extreme fault conditions, ensuring rapid bypass.
Autonomous Control: The control system is domestically managed for efficient troubleshooting.
Convenient Service: Local manufacturers provide quick and flexible maintenance support.
Note
The main pump VFD is the sole power source for reactor coolant pumps, with each unit equipped with four pumps and VFDs. Prior to these improvements, any unexpected failure of a main pump VFD could lead to immediate reactor shutdowns due to low flow signals.