en.Wedoany.com Reported - Recently, the spring vibration isolation device for the turbine generator foundation of Unit 3 of the Phase II project of CGN's Zhejiang San'ao Nuclear Power Plant successfully passed factory joint acceptance and was dispatched to the site for installation and use. This marks the first time the device has achieved independent supply, signifying that China has attained technological self-reliance and control in the field of foundation vibration isolation for nuclear power turbine generator units.
The spring vibration isolation device is a key load-bearing component of the foundation baseplate for nuclear power turbine generator units, similar to a vehicle's suspension system. It effectively isolates the downward transmission of vibrations generated during turbine operation, allowing the part below the isolator to primarily bear static loads. For a long time, the core technology for spring vibration isolation devices in nuclear power turbine generators was controlled by foreign enterprises, leading to persistently high equipment prices and risks to the security and stability of the supply chain.
To accelerate the domestic R&D process of nuclear power equipment and build a modern "Hualong One" nuclear power equipment industry chain, enhancing core competitiveness and security resilience, under the unified deployment of China General Nuclear Power Group (hereinafter referred to as "CGN"), CGN Engineering Co., Ltd. (hereinafter referred to as "CGN Engineering") actively played a leading role in the industry chain. It led the joint independent research and development with Changzhou Green Power Machinery Manufacturing Co., Ltd. (hereinafter referred to as "Changzhou Green") to overcome challenges such as the inapplicability of Chinese spring design standards, the lack of relevant standard specifications, and the absence of precedents for fatigue equivalent calculations. Breaking through industry-established thinking, they developed a contact line compensation structure to effectively enhance spring fatigue resistance, a hot static pressure pretreatment process to effectively improve spring relaxation resistance, an end-face precision machining process to increase geometric accuracy after spring processing, and a group assembly process to enhance final product performance. This efficiently established a standard system and methodology for the full-chain service of design, manufacturing, inspection, installation, and operation and maintenance of autonomous turbine generator foundation spring vibration isolation devices meeting nuclear power design and quality requirements, significantly improving prototype performance indicators. Compared with imported similar products, the device achieves full coverage of technical indicators and meets the foundation vibration isolation application requirements for "Hualong One" turbine generator units.
After 22 months of R&D efforts, the device passed expert appraisal in August 2025, with the conclusion that it fills a domestic gap in China, and its main performance indicators have reached the advanced level of similar international products.
Entering the engineering application phase, CGN Engineering and Changzhou Green strictly enforced quality control. Based on the design, manufacturing, and quality assurance management requirements for nuclear power projects, they overcame production organization challenges for batch manufacturing, successfully completing the production tasks and providing strong guarantees for the high-quality manufacturing and supply of the equipment.
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