U.S. Moves to Relax Oversight of Small Maritime Nuclear Reactors, Promoting Civilian Floating Nuclear Energy Applications

The U.S. government is pushing to remove or simplify regulatory barriers to deploying civilian nuclear reactors on floating platforms and vessels, aiming to pave the way for small modular reactors to enter maritime shipping and offshore energy applications. The relevant topics will be highlighted during the International Atomic Energy Agency's ATLAS initiative event from August 26 to 27, with the U.S. also planning to showcase reactor technologies suitable for waterborne operations. The day prior, the U.S. will host an industry day, inviting nuclear and maritime sector companies to present their solutions.

This move reflects the strategic importance the U.S. energy sector places on small modular reactors. Compared to traditional large-scale nuclear power plants, small modular reactors emphasize high energy density, longer operational cycles, and reduced refueling requirements, making them considered suitable for powering oceangoing vessels, offshore platforms, and remote coastal regions. IAEA Director General Grossi has also noted that the global maritime industry faces challenges related to reliability, energy security, and sustained high-intensity operations, and that small modular reactors could offer a viable option for maritime transport and offshore energy systems.

The U.S. is not without experience in maritime nuclear power; its Navy has long operated nuclear-powered aircraft carriers and previously operated nuclear-powered cruisers. However, there are significant differences between military nuclear propulsion and civilian commercial deployment, with cost, maintenance, regulation, and public acceptance all being critical hurdles. Historically, the NS Savannah, launched in 1959, was the first civilian nuclear-powered merchant ship, but its high operating costs made sustained promotion difficult. Today, proponents hope that next-generation small modular technologies can address the economic shortcomings of past civilian nuclear-powered vessels.

Currently, operational floating nuclear power plant cases worldwide remain limited, with Russia's "Akademik Lomonosov" being a representative project. The platform entered service in 2019, equipped with two KLT-40S reactors, with a total generating capacity of approximately 70 megawatts, primarily serving remote coastal cities and industrial facilities. This case demonstrates the practical feasibility of floating nuclear power, but also shows that the field remains in a highly specialized, limited-scale stage of development, still far from widespread commercial application.

Deploying nuclear reactors at sea does not eliminate nuclear safety risks; it merely changes the nature of the risks. Seawater provides a vast cooling resource, but a platform far from land that loses backup power or experiences an accident could face greater challenges in rescue and response; in the event of a radioactive release, coastal ecosystems could also be affected. The U.S. push for regulatory and technical demonstration this time is both a bid for influence in future offshore clean energy and advanced manufacturing, and a test of whether small modular reactors can truly clear the three hurdles of safety, economics, and public trust.