The nuclear lighter carrier “Sevmorput” was built in 1988 at the Kerch Shipbuilding Plant “Zaliv” named after B.E. Butomas under the project of the Leningrad Central Design Bureau “Baltsudoproekt”.
In 2019, by order of the “Atomflot”, the Kanonersky Shiprepairing Yard carried out docking repairs of the “Sevmorput” nuclear powered lighter carrier.
Repair of the “Sevmorput” nuclear powered lighter carrier was carried out for the first time in the Shipyard history, which required careful preparation. Docking the vessel with an operating nuclear power plant requires a detailed investigation of not only technical issues, but also organizational issues related to ensuring environmental and nuclear safety.
Previously the ship was usually repaired at “82 Shipyard” in Roslyakovo with a PD-50 floating dock, 330 meters long, which made it possible to dock the “Sevmorput” with its overall length of 260 meters with a significant margin.
The length of the dock number 5 of the Kanonersky Shiprepairing Yard is 246 meters, which is 14 meters less than the length of the vessel. The docking weight of the vessel is 32150 tons with a maximum dock carrying capacity of 35600 tons, therefore, the question of docking the vessel required an assessment of the possibility and procedure for carrying out this operation with the involvement of the “Baltsudoproekt” design bureau. Also the port captain services were engaged in the investigation of the such dimensions vessel shifting within port area.
During the docking operation, after the ship was docked and the keel blocks were touched the vessel bottom, the ship was de-ballasted to reduce the docking weight and reduce the specific load on the ship and dock. The dock operation required careful preliminary study of all stages of docking and precise coordination of the actions of the dock team, the crew of the vessel and auxiliary tugs when placing the vessel in the dock and withdrawing from it. Docking was carried out according to plan and without complications.
The ship was docked in December 2019 and it was undocked in February 2020. All planned work was completed on a contractual basis in accordance with the agreed schedule under the technical supervision of the Russian Maritime Register of Shipping.
It was carried out works with the ship's hull, superstructure, propeller-steering complex with the replacement of stern tube seals, which was performed without complete disassembling, using technology approved by the RMRS. A set of works was carried out with anchors and anchor chains, chain and ice boxes, ballast tanks, pipelines, etc.
Repair works of cooling systems fittings was complicated due to the size of valves with inside dia. up to 800 mm, which required the special equipment for the works in narrow spaces.
In cooperation with the technical specialists of the “Atomflot” and specialized organizations a comprehensive maintenance of the vessel was performed in the required volume.
After the repair was completed at the Kanonersky Shiprepairing Yard the “Sevmorput” nuclear powered lighter carrier returned to operation.