Europe Delivered Final Iter Fusion Vessel Section
The delivery marks a 16-year manufacturing effort to house the extreme conditions required for nuclear fusion.
Updated on Oct. 5, 2026 in Nuclear
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Europe has delivered the final section of the vacuum vessel for the Iter fusion project in Southern France. This milestone concludes a 16-year manufacturing process to create the double-walled container that will house the fusion reaction.
Why it matters
The vacuum vessel is essential for maintaining the clean, high-temperature environment necessary for fusion to occur. This project represents a massive international collaboration to advance fusion energy science.
The completed assembly will measure 19.4 metres in diameter and 11.4 metres in height, with a total weight of approximately 5,200 tonnes. The container is engineered to withstand the extreme conditions needed for plasma formation.
The players
Iter
An international nuclear fusion research and engineering project based in Southern France.
Ansaldo Nucleare
An Italian firm specializing in the design and construction of nuclear power plant components.
Westinghouse Electric
A U.S.-based nuclear power company that provides fuel and services to light water reactors.
Walter Tosto
An Italian heavy manufacturing company that fabricates pressure vessels for the nuclear and oil industries.
The details
The vacuum vessel is a double-walled container constructed from stainless steel designed to isolate the fusion reaction. It consists of nine individual sections that must be joined to form the final chamber, which prevents impurities from entering the reaction zone. The effort involved at least 15 European companies, including Ansaldo Nucleare, Westinghouse Electric, and Walter Tosto.
Timeline
2010: Manufacturing journey for the vessel section started.
2026: Final vacuum vessel section delivered.
The Tech Race
This development follows the production of four vacuum vessel sections by South Korea, with Europe providing the remaining five. The project sits at the center of global research efforts to achieve sustained plasma temperatures for energy production.
This milestone represents a critical advancement for scientific research rather than a consumer-facing product. Continued progress on the assembly of the 5,200-tonne vessel will determine the timeline for future plasma experiments.
The takeaway
The successful delivery of these massive steel components keeps the massive €22 billion project moving toward its assembly goals. Observers should track the upcoming integration of these nine sections as the facility prepares for future testing phases.
Further reading
Explore the latest developments in Nuclear fusion infrastructure and international collaboration.
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