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The project of removing the broken bolts, restoring the threads and conducting online machining for the 103 major overhaul of Hainan Nuclear Power Plant has been successfully completed.The "Service for Removing Fractured Bolts, Thread Repair and Online Machining of Components" project for the "Hebei Nuclear Power 103 Overhaul" was successfully completed on February 23rd by Beijing Leiming Cyber Electromechanical Technology Co., Ltd. During the 103 overhaul, the following tasks were accomplished: 2 threaded repairs for the 5# and 6# bearing seats of the steam turbine, 1 removal of the broken bolt (M33) of the main steam valve, and 220 online expansion hole processing of the expansion joint flange of the condenser.
Figure 1 - Image of the M52×3 thread before repair operation
Figure 2 - Working condition image of the M52×3 threaded part after repair (wire sleeve)
On the 103 major revision project, during the Spring Festival, our company received a notification from Hainan Nuclear Power on the evening of February 7th (the third day of the lunar month). After that, we initiated the emergency plan and overcame numerous "difficulties" during the Spring Festival to coordinate the construction personnel and construction equipment to arrive at the site in batches. The first batch of construction personnel (Guo Qingwen, Li Zhaoyue, and Yang Xiaowu) arrived at the site on February 9th (the fifth day of the lunar month) to carry out related work. With the active cooperation of the maintenance department of Hainan Nuclear Power, all the work was completed within the required time nodes as per the major revision requirements.
Figure 3 - Picture of broken wire removal
Figure 4 - Completed installation image of expansion joint flange drilling During the construction of this project, our company's independently developed complete set of equipment for removing broken bolts and repairing internal threads, as well as the processing and repair techniques for broken bolts and internal threads, were all utilized. The complete set of supporting construction equipment, experienced construction personnel and mature techniques ensured the progress and quality of the construction, and were also highly recognized by Hainan Nuclear Power. |
