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The merchant marine has already experimented with nuclear propulsion
The use of a nuclear reactor to power a civilian ship is nothing new. As early as 1962, the United States commissioned the NS Savannah , a combined passenger and cargo ship designed to demonstrate the feasibility of this technology. Despite satisfactory technical results, its operation ceased in 1970 due to a lack of commercial viability.
Germany is conducting a similar experiment with the tanker Otto Hahn , which entered service in 1968. After more than ten years of operation, its nuclear propulsion system was decommissioned in 1979, prior to its conversion to a conventional propulsion system.
In Japan, the Mutsu , launched in 1969, faced difficulties of a different nature: a flaw in radiation protection uncovered during the 1974 tests led to a lengthy suspension of the program, which resumed only in the early 1990s before being abandoned.
Finally, the Sevmorput , an icebreaker-class cargo ship commissioned in 1988 in the Soviet Union, exemplifies a more specialized use of nuclear power, tailored to the constraints of Arctic maritime transport. These four examples demonstrate that civilian nuclear propulsion is technically feasible, but its development remains closely tied to operating costs, safety requirements, port authorizations, and the missions assigned to the ships.
A superyacht does not face the same constraints as a cargo ship
These four experiments show that the question is no longer whether a reactor can power a ship. For a superyacht, the challenge lies in integrating it on board. A nuclear power plant requires cooling systems, radiation shielding, monitoring devices, and specific safety procedures.
It also requires qualified personnel and a specialized organizational structure for maintenance, inspections, and emergency situations. Above all, a superyacht frequently calls at marinas, tourist ports, and anchorages near populated areas. Permits to dock and hosting conditions could become just as critical as propulsion performance.
Can small reactors be a game-changer?
SMRs are reigniting the debate today because they are designed to be more compact and potentially more standardized than traditional reactors.
However, this development does not eliminate safety requirements, integration constraints, or the management of fuel and radioactive waste.
It also raises an economic question. Superyachts generally operate at full power for shorter periods than intensively used merchant ships. The merits of a nuclear investment must therefore be evaluated based on actual usage patterns. Finally, the absence of direct CO? emissions from onboard combustion is not sufficient to determine the complete environmental impact of such a solution. This assessment must take into account construction, the fuel cycle, infrastructure, and decommissioning.
METSTRADE: A Discussion Rather Than an Announcement
The conference on November 17 will not mark the immediate arrival of nuclear propulsion in the recreational boating industry. Above all, it will provide an opportunity to compare the possibilities offered by new technologies with the challenges faced by the civilian vessels that preceded them.
From the Savannah to the Sevmorput, history shows that nuclear-powered ships can work. It also shows that a propulsion system that is technically sound does not necessarily fit into a commercial operating model.
For superyachts, the main challenge may therefore not be building a jet engine that is compact enough, but rather designing the entire regulatory, port, and operational framework that would allow such a vessel to sail.
