IN Brief:
- UK Fusion Energy has launched five STEP system partner procurements with an aggregate value of up to £115m.
- The packages cover breeder blanket, fuel cycle, testing, plant controls, and whole-plant systems engineering and integration.
- Successful bidders would support design maturation and technical validation for the proposed prototype fusion power station at West Burton.
UK Fusion Energy is seeking five specialist engineering partners for the STEP prototype fusion power plant planned at West Burton in Nottinghamshire, through procurements with a combined potential value of £115m. The opportunities cover the breeder blanket, fuel cycle, test operations, control systems, and whole-plant systems engineering. Each appointed partner will help develop design specifications and methods of proving equipment performance before the reactor’s construction and commissioning phases.
STEP, short for Spherical Tokamak for Energy Production, is the UK programme to develop a prototype fusion electricity plant on the former West Burton power station site. Its planned reactor uses a compact tokamak configuration to confine a plasma in which fusion reactions can occur. The engineering challenge extends well beyond the confinement device: a power producing facility must manage fuel, recover heat, maintain its plant systems, and coordinate large numbers of mechanical, electrical, and control interfaces safely and reliably.
The breeder blanket opportunity concerns equipment that would surround the plasma chamber to absorb energy and contribute to future tritium fuel production. In a proposed deuterium-tritium fusion system, tritium supply is a central design constraint, and recovery of energy from the reaction is a separate but closely linked requirement. The exact blanket technology and performance specification for STEP have not been established by the newly announced procurement, which seeks engineering work to advance the design rather than reporting a final equipment selection.
A separate fuel cycle partnership will develop technologies for supplying, processing, recycling, and storing the fuels needed by a future plant. A fusion fuel cycle cannot be assessed simply by calculating the material consumed by the plasma. It also has to account for the location and inventory of fuel throughout processing equipment, the recovery of material after each operating cycle, and the interfaces with safety and monitoring systems. The equipment remains at the development stage, with design validation forming part of the announced work.
UK Fusion Energy is also seeking a test operations partner to develop and run facilities in which engineering solutions can be examined before installation in a prototype power station. Such facilities provide a means of evaluating components and integrated systems under defined conditions, identifying problems before plant assembly becomes the critical path. The procurement does not name the testing locations or identify individual machines to be built, so these should not be presented as confirmed construction projects.
The control system partnership addresses the instrumentation, software, and systems that would monitor and coordinate operation. A fusion power plant has interacting subsystems operating over very different time scales, ranging from measurements used to regulate the plasma to conventional power station equipment and auxiliary electrical services. Any practical control architecture has to establish which signals and commands cross subsystem boundaries and how faults are detected and handled. The precise control hardware, communications network, and protection equipment remain to be specified.
Whole-plant systems engineering will coordinate the interfaces among specialist packages. Thermal management, power supplies, control signals, fuel processing, maintenance access, and safety requirements must be defined consistently, since individual components can satisfy their own specifications without operating successfully as one installation. The integration partner’s work will include maintaining common technical assumptions and checking their implementation as designs develop.
Fuel processing requirements can alter the breeder blanket design, while the testing programme determines how components and their controls must demonstrate performance. A revised cooling arrangement, for example, can change the electrical load, available space, and maintenance requirements of neighbouring equipment. The five contracts therefore place substantial emphasis on interface management across supplier boundaries, although the final allocation of responsibilities between contractors will follow the awards.
West Burton was selected as the STEP site in 2022, establishing a location for development of the proposed prototype and its associated industrial activity. The programme’s stated long-term objectives include producing net electricity, establishing a credible route to managing fusion fuels, and developing materials and components suitable for demanding conditions. World Nuclear News reports a target of more than 100MW of predictable net electricity, with operation sought around 2040. These are programme objectives, not demonstrated output or an agreed commissioning result.
£115m is the maximum combined value advertised for the five opportunities, rather than expenditure already committed to successful suppliers. The announcement does not provide allocations for individual packages or name winning contractors. Tender documents are accessible through the government’s Find a Tender service, with subsequent award notices expected to identify the organisations appointed and their contractual scopes.
The selected partners will enter a programme where design calculations and engineering tests have to converge on a buildable plant configuration. As fuel handling, controls, the blanket, and testing facilities are developed, their interfaces will be checked against the wider power station design. The next procurement milestones are the selection of the five partners and the publication of the detailed work they will undertake.
