UK Achieves Milestone with 5.5 Tonnes of Radiation-Resistant Steel for Fusion Reactors

UK Achieves Milestone with 5.5 Tonnes of Radiation-Resistant Steel for Fusion Reactors

Scientists in the UK have made a major breakthrough in fusion energy with the development of 5.5 tonnes of a new steel designed to withstand the extreme heat and intense neutron radiation found in nuclear fusion reactors. This steel, called reduced-activation ferritic-martensitic steel (RAFM), is a significant step forward for Europe’s growing number of fusion energy startups.

The development comes from a working group within the UK Atomic Energy Authority (UKAEA) named NEURONE. This is the first time that RAFM steel has been produced on an industrial scale in the UK, and it holds immense potential for future fusion energy reactors. Ryan Ramsey, COO of UK startup First Light Fusion, expressed optimism about the breakthrough, stating, “This is really positive and potentially has relevance for all fusion energy projects.” Fusion energy, which powers the Sun, works by heating hydrogen atoms to extremely high temperatures, creating a charged gas known as plasma. The plasma is then compressed using magnetic fields or lasers, forcing the atoms to fuse and release energy that can be used to generate electricity. In fusion reactors, the plasma reaches temperatures as high as 150 million°C, making them some of the hottest places in the solar system.

However, the major challenge isn’t the heat, but neutron damage. Neutron radiation inside fusion reactors can quickly degrade the walls, forcing shutdowns to replace them. These frequent shutdowns hinder continuous power production, making it a significant issue for the viability of fusion energy. The new RAFM steel, developed by NEURONE, can endure high neutron radiation and temperatures up to 650°C, improving the longevity and operational efficiency of fusion powerplants. For fusion startups like First Light Fusion, this breakthrough is another crucial step towards making commercially viable fusion reactors a reality.

NEURONE’s steel was produced using an electric arc furnace at the Materials Processing Institute (MPI) in Middlesbrough, marking a new, cost-effective method of manufacturing RAFM steel. According to UKAEA’s David Bowden, the new method could reduce production costs by up to 10 times, making the steel more accessible for future commercial fusion programs. The creation of this steel comes at a time when fusion energy is closer to becoming a viable source of power. A poll conducted at the International Atomic Energy Agency’s (IAEA) forum in London in 2024 revealed that 65 percent of industry insiders believe fusion will be able to generate electricity for the grid at a viable cost by 2035, with 90% expecting this by 2040. This milestone marks another exciting chapter in the ongoing development of fusion energy and brings the dream of clean, limitless power a step closer to reality.