en.Wedoany.com Reported - On June 7, Unit 4 of Russia's Kola Nuclear Power Plant was reconnected to the grid after completing a 53.5-day maintenance overhaul. The maintenance was carried out by relevant professionals as planned, with the entire process strictly adhering to all standards and safety requirements.

During this planned preventive maintenance, a series of operations were performed on the unit's key equipment. These included a major overhaul of the reactor plant, complete unloading of the core fuel, and maintenance of the main stop valves.

The scope of the maintenance also covered safety system equipment and equipment related to the turbine plant. Through these efforts, the unit's operational reliability and safety assurance capabilities were further maintained and enhanced.

Special attention was paid to equipment modernization during this maintenance. Personnel updated the main circulation pump oil system, replaced components related to the turbogenerator shaft sealing system, and implemented modernization upgrades to the control and protection system.

In the electrical section, the maintenance team replaced cable lines and automatic circuit breakers in the integrated distribution device. These operations help improve the operational stability of the electrical system and reduce potential risks during long-term operation.

Vladimir Matveyev, Chief Engineer of the Kola Nuclear Power Plant, stated that safe and reliable operation has always been a priority for the plant. The planned preventive maintenance of Unit 4 has been completed on schedule, with experts from the plant and contracting organizations carrying out a large amount of work, ranging from reactor overhaul to modernization of critical safety systems.

Matveyev noted that thanks to coordinated efforts, Unit 4 has been reconnected to the grid and is stably carrying load. The Kola Nuclear Power Plant also mentioned that it ranked among the top three in the 2025 annual evaluation of Russian nuclear power plants.

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