Sean Duffy’s MARAD initiative may look like another Trump-era energy dominance announcement, but beneath the politics lies a serious industrial question: can the United States build the regulatory, shipyard, insurance and port framework needed to make nuclear-powered merchant ships commercially viable before Asia takes the lead? //
The real story behind the announcement made by U.S. Transportation Secretary Sean P. Duffy and the Maritime Administration on 7 May is not that America has discovered nuclear propulsion. It is that Washington has finally recognized maritime nuclear power as a shipbuilding, logistics, insurance, port-access and national-security race, and has decided to enter it. MARAD’s Request for Information, with comments due by 5 August 2026, asks industry to help develop a U.S.-built, scalable, commercially viable SMR model for marine transportation. That is a materially different ambition from funding a reactor demonstration. It is an attempt to build a complete commercial ecosystem. //
Shipping is uniquely suited to nuclear propulsion. The energy density argument for maritime nuclear propulsion is more compelling than for almost any other transport sector. A modern ultra-large container ship consumes between 250 and 350 tonnes of fuel per day at sea. Over a 25-year operational life, fuel can represent billions of dollars in lifecycle cost. Bunker storage, fuel treatment systems, purifier rooms, sludge handling, emissions scrubbers and the growing infrastructure of alternative-fuel compliance consume enormous volumes of space, capital and crew time. Nuclear propulsion potentially eliminates most of that complexity, a reactor fuelled for two decades or more fits within a containment space that returns cargo volume to its owners and voyage economics to their prior simplicity. //
Thorium, increasingly discussed as an alternative fuel cycle, offers further advantages. Thorium-232 converts under neutron bombardment to fissile uranium-233, is three to four times more abundant than uranium in the earth’s crust, produces significantly less long-lived radioactive waste, and is far less susceptible to weapons proliferation. Molten salt reactor designs, which dissolve thorium in liquid fluoride salt that also acts as the coolant, operate at atmospheric pressure rather than under the high-pressure steam conditions of conventional light-water reactors, removing explosive decompression risk. An approval in principle for a nuclear-powered LNG carrier using molten salt technology was granted in 2025. //
The United States now accounts for approximately 0.1 per cent of global commercial ship production. A single Chinese state shipbuilder built more vessels by tonnage in 2024 than the entire U.S. industry has produced since 1945. //
The U.S. has become marginal in commercial construction outside naval programmes, which is precisely why the MARAD announcement repeatedly frames SMR development as a mechanism for rebuilding domestic yards, creating strategic engineering employment, and reconnecting maritime and defence industrial capacity. //
While Europe debates how to tax shipping emissions, the United States is beginning to ask who will build and power the next generation of ships altogether.
South Korea is not waiting for that question to be answered. HD Hyundai has unveiled a 15,000 TEU-class SMR-powered containership concept and is working with ABS on nuclear-electric propulsion systems potentially supplying up to 100 megawatts. China has explored molten salt reactor ship concepts and is investing heavily in thorium-based systems. Russia already operates the only nuclear-powered commercial vessels in service, alongside its Arctic icebreaker fleet.
