A consortium led by France-based start-up newcleo has been selected under the call-for-projects, Supporting the decarbonisation of the French maritime sector, managed by Bpifrance. The n-Floating project aims to demonstrate the technical feasibility of floating nuclear power solution, based on multiple 200 MWe LFR-AS-200 reactors.
The consortium brings together newcleo, leading classification society Bureau Veritas Marine & Offshore, and French engineering company ABMI Groupe, with expertise both in maritime and nuclear sectors. The project has been awarded almost €1m ($1.16m) in funding under the programme. Work is expected to run for approximately 18 months.
The award extends newcleo’s activities in maritime nuclear, building on existing collaborations with Fincantieri on nuclear-powered commercial vessels and with Saipem on offshore nuclear applications.
According to newcleo, the concept was “designed with industrialisation and deployment at scale in mind and will draw on the extensive experience and established capabilities of the maritime and offshore industries”. It will leverage proven approaches developed by the oil & gas sector for the design, construction and operation of floating infrastructure for energy production, storage, liquefaction and regasification. “By combining mature maritime capabilities with advanced nuclear technology, the project aims to develop a standardised, deployable and competitive solution for low-carbon energy generation at sea and in coastal locations.”
The initial phase of the n-Floating project will focus on conceptual studies for the nuclear barge, assessing its potential to deliver reliable, low-carbon and competitive energy across a range of applications. These include supplying isolated regions, ports and associated industrial hubs, and coastal areas, as well as supporting energy-intensive applications such as desalination and the production of low-carbon fuels.
The project will also define the subsequent development programme and roadmap towards potential industrial deployment by 2036, with the ambition to design and build the solution in France, contributing to industrialisation and decarbonisation efforts.
Bureau Veritas Marine & Offshore will contribute its expertise in classification, risk assessment and certification, supporting the evaluation of safety, regulatory and technical considerations associated with the development of floating nuclear applications.
“Achieving large-scale decarbonisation will require energy solutions that are not only technically feasible, but also capable of being deployed safely, efficiently and at scale,” said Christophe Chauviere, Marine & Offshore Technical & Operations Excellence Senior Vice President at Bureau Veritas. “The n-Floating project provides an opportunity to evaluate how advanced nuclear technology can be combined with established maritime and offshore practices to support the development of a scalable and commercially viable floating energy solution for future industrial and maritime applications.”
François Laborde, Chief Executive Officer of ABMI Groupe, said: “n-Floating brings together complementary expertise to explore new pathways for low-carbon maritime energy solutions. While newcleo brings its reactor technology and Bureau Veritas Marine & Offshore provides maritime regulatory expertise, ABMI Groupe brings engineering and project delivery experience gained across complex industrial programmes in the maritime and nuclear sectors.”
The weak point in the project is the proposed nuclear technology. The LFR-AS-200 is fundamentally a conceptual design, and a long way from realisation. No commercial reactor of this type has been built, and its deployment targets remain highly ambitious projections.
The LFR-AS-200 acronym stands for Lead-cooled Fast Reactor – Amphora-Shaped, with 200 representing its electrical output in megawatts. It uses molten liquid lead rather than water or sodium as cool and runs on proprietary mixed-oxide (mox) fuel fabricated from recycled legacy nuclear waste and surplus materials. The proprietary inner vessel mimics an ancient amphora vase. This shape drastically shrinks the primary system volume making it four times more compact than traditional liquid-metal designs
The blueprint dispenses with high-maintenance components. It functions safely without an in-vessel refuelling machine, intermediate cooling loops, diagrids, or complex pump flywheels. It features a short, spiral-tube steam generator bundle positioned partially above the reactor roof to minimise risk during a tube rupture.
The International Atomic Energy Agency (IAEA) formally categorises the LFR-AS-200 in its SMR catalogues as being in the “Conceptual Design” stage. While the design entered the UK’s Generic Design Assessment (GDA) and technical engagement with the US NRC, these are purely pre-application and preliminary paperwork reviews. They evaluate mathematical models and safety theories, not a physical machine.
There are currently no operational lead-cooled fast reactors generating commercial power anywhere in the world, with the only one nearing completion being the Brest-OD 300 in Russia. To get the design off the paper phase, newcleo is using a staggered prototyping strategy.
The only physical milestone achieved is a non-nuclear test rig called the Precursor, currently under mechanical assembly at the ENEA Brasimone Research Centre in Italy. It features a 20-tonne empty vessel and electric heaters to test how 100+ tonnes of liquid lead flow. It contains no nuclear fuel. Before the 200 MWe version can even be approved for commercial manufacturing, a smaller, nuclear 30 MWe demonstrator must be designed, licensed, and built in France. That is not targeted until 2031–2032.
Moving from the early design phase to a floating barge will require resolving massive technical and regulatory unknowns. Molten lead is highly corrosive and structurally expands/eats through standard steel vessels at high temperatures. Perfecting the secret alloys required for the LFR-AS-200 is still an active research challenge.
Nuclear regulators move deliberately. The initial regulatory reviews will take years just to determine if the “amphora-shaped” geometry is inherently safe enough to permit a physical build. Ultimately, the n-Floating project grant from Bpifrance is a feasibility study. It funds engineering blueprints and risk calculations to see if a floating module is even viable, long before any steel is cut for a floating reactor.
