核电站“心脏外科医生”的春节坚守

Core Viewpoint - The article highlights the successful implementation of a domestically developed remote underwater repair technology for the CRDM (Control Rod Drive Mechanism) heat sleeve at the Ningde Nuclear Power Station, marking a significant advancement in China's nuclear power maintenance capabilities [2][6]. Group 1: Technology Development - The CRDM is crucial for controlling nuclear reactions, and its heat sleeve is essential for precise control rod movement. Any defects can lead to unplanned shutdowns [2]. - Historically, the repair technology for CRDM heat sleeves has been monopolized by foreign companies, but recent advancements by China National Nuclear Corporation (CNNC) have led to a breakthrough in this area [2][5]. - The project initiated in 2021 aimed to develop an advanced solution for CRDM heat sleeve repairs, overcoming previous limitations imposed by foreign service providers [2][3]. Group 2: Project Challenges - The project faced numerous challenges, including the need for high-precision repairs in a submerged environment, which required the development of new tools and techniques from scratch [3][4]. - A critical moment occurred in early 2022 when a key valve leak threatened to delay the project. The team innovatively proposed an "online repair" solution to address the issue without draining the system [4][5]. - The project team demonstrated exceptional collaboration and problem-solving skills, working through the night to ensure the success of the repairs [4][6]. Group 3: Implementation and Results - The implementation phase involved using a specially designed long tool to perform intricate repairs, akin to "embroidery on an eggshell" [6]. - The project team maintained a rigorous training regimen, emphasizing precision and attention to detail, which contributed to the successful execution of the repairs [6]. - In 2024, the technology was successfully applied to address similar defects in CNNC's reactors, achieving the world's first remote underwater online repair of CRDM heat sleeves, which outperformed traditional foreign methods [6][7].