en.Wedoany.com Reported - On March 31st, after 46 days and nights of continuous effort, the Hongyanhe Project Department of China Nuclear Industry 22 Construction Co., Ltd. Nuclear Power Maintenance Company successfully completed all planned maintenance and technical renovation tasks for the H209 overhaul. All key indicators passed owner acceptance with excellent ratings, achieving the "three zeros" goal: zero safety incidents, zero quality defects, and zero owner complaints. This demonstrates solid capability in laying a strong foundation for nuclear power safety.

The H209 overhaul began in mid-February. The project team was primarily responsible for core civil maintenance work on Unit 2, covering critical tasks such as steel structure modification, hole sealing, and leak point investigation and repair within the nuclear island. During the overhaul, a total of 403 work permits were received, with an on-time completion rate of 100%.

Scientifically Coordinated Planning Achieves "High Speed"

Facing multiple challenges including intensive tasks, multi-disciplinary cross-work, tight critical path milestones, and upgraded acceptance standards, the project team tackled the difficulties head-on.

Prior to the overhaul, the team proactively planned the pre-overhaul prerequisite verification scheme. For the first time, the headquarters took the lead, collaborating with the Fangchenggang Nuclear Power Maintenance Project Department within the CGN system to participate in the overhaul preparation, facilitating a high-standard start. Simultaneously, leveraging this overhaul, a real-time experience exchange platform within the CGN system was established, laying a solid foundation for future benchmarking and mutual improvement in maintenance work.

During the overhaul, the project department established a communication mechanism of "daily meetings + specialized liaison groups + on-site stationing," enabling rapid response to needs and on-site problem closure, meeting the owner's high standards through full-process control and efficient service. Confronted with a shortage of on-site manpower during the mid-overhaul period and the risk of delays to critical milestones, the project team activated an emergency dispatch plan. They mobilized key personnel to form a technical backbone task force, implementing 24-hour shift work in echelons, firmly securing critical path milestones and clearing obstacles for the overall overhaul progress.

Coordinated Operations Gather "Great Strength"

On the front line of the overhaul, dedication was evident everywhere. In the task of reinforcing the nuclear island steel platform, the steel structure maintenance team faced harsh conditions of -6°C and confined workspaces. Party member pioneers led the charge, with all personnel working tirelessly in shifts without complaint. Wearing heavy protective gear, they precisely completed bolt fastening with a 0.2 mm accuracy tolerance, delivering the critical milestone ahead of schedule.

During the peak overhaul period, multiple tasks such as pipeline maintenance, electrical panel modification, insulation removal, and fire protection system calibration were conducted simultaneously in the nuclear island area. Crowded space and overlapping work sequences posed risks to safety and schedule. The project team strategically divided work areas and time windows, proactively identified interface risks across disciplines, formulated staggered work and coordinated protection plans, and designated interface coordinators for each discipline, dynamically adjusting work plans in real-time. During the installation and removal of the main pump cover guardrail, a 30 mm deviation was found between the original design and the site conditions. The project's technical team worked overnight to re-measure data, revise, and optimize the drawings, completing the scheme optimization in just 8 hours to ensure seamless integration with the mechanical discipline.

During the opening of holes in the nuclear island, the existing template dimensions were incompatible due to the complex layout of on-site equipment. The technical and construction teams conducted on-site measurements, optimized the plan, and modified the template, ultimately completing the task with high quality within the main work permit period, ensuring the synchronized progress of the overall work sequence.

Twin Engines Drive the Creation of a "Hard Benchmark"

Throughout the overhaul, the project team consistently prioritized safety and quality, establishing a comprehensive, all-encompassing, and full-process safety and quality control system.

In terms of safety management, the project team comprehensively advanced the digital transformation from paper-based work packages to electronic work packages. Through organizing specialized training and providing one-on-one, hands-on guidance, they helped all personnel quickly master the usage methods, achieving standardized work processes and zero-delay information flow, providing digital support for the safe and efficient execution of the overhaul. Simultaneously, they focused on high-risk scenarios such as work at height, confined space entry, and radiation control. Through daily pre-shift safety briefings, regular safety training, specialized skill assessments, on-site patrol inspections, and "hot feedback" on overhaul experience, they continuously strengthened the safety awareness of all personnel, standardized work behaviors, and eliminated violations.

Regarding quality management, a digital platform for visual quality control of open-item foreign material exclusion (FME) and anti-loosening items was introduced, enhancing the precision and traceability of quality management. They strictly implemented the plant's STAR (Stop, Think, Act, Review) self-inspection, embedding "Stop, Think, Do, Check" into every process and operation. To standardize FME management, the project implemented traceable, full-lifecycle, closed-loop ledger management, clearly defining responsible entities, risk points, prevention measures, and closure criteria, ensuring foreign material risks throughout nuclear power construction and maintenance are controllable, under control, and manageable. Furthermore, key processes were subject to full-time, on-site supervision by designated personnel. Regular inspections and random checks of on-site construction activities were conducted, adhering to the principle of "zero release of non-conforming items, zero retention of defect items," ensuring all maintenance results passed initial inspection with excellence, meeting standards on the first attempt.

The bitter cold will eventually pass, but the craftsmanship and sense of responsibility dedicated to safeguarding nuclear safety have long been etched into the hearts of every Hongyanhe maintenance worker, becoming a solid force for the next overhaul endeavor.

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