Framatome, Four European Utilities Partner on Sovereign VVER-440 Fuel Design

Framatome signed a cooperation agreement with ČEZ, Fortum, MVM Paks, and Slovenské elektrárne on April 9 to develop a fully European VVER-440 fuel assembly, putting named partners, fabrication infrastructure, and a multi-phase qualification roadmap behind what had been a strategic ambition since the company began its VVER fuel development work in 2018.

The reactor fleet at stake is concrete and countable: 15 VVER-440 units currently operating across the four partner countries, including four at ČEZ's Dukovany plant in the Czech Republic, two at Fortum's Loviisa station in Finland, four at MVM Paks in Hungary, and five spread across Slovenské elektrárne's Bohunice and Mochovce sites in Slovakia. Every one of those reactors was designed in the Soviet Union and has historically sourced fuel from TVEL, the Russian state fuel manufacturer. Replacing that supply chain is not a component swap. VVER-440 fuel assemblies use a hexagonal lattice geometry with integrated control rod followers that are geometrically and neutronically distinct from Western PWR fuel. Any replacement design must be validated across thermal-hydraulics, neutronics, and materials performance, then accepted by four separate national regulators before a single commercial reload can proceed.

The fuel assembly being developed under the agreement carries the designation VERA-440. Phase one of the project covers the full fuel assembly design and its associated transport container, work that will draw on Framatome's fabrication facilities at Romans in France and Lingen in Germany. Phase two is the lead test assembly program: physical LTAs are fabricated, loaded into an operating reactor alongside standard fuel, and irradiated across multiple cycles to generate the performance data regulators require before licensing reloads. The SAVE project, Framatome's EU-backed development program that encompasses this work, runs through June 2028 with a total budget of EUR 18.68 million, of which EUR 10 million came from the Euratom Research and Training Programme in June 2024. First fuel assembly introduction is targeted for 2028.

In parallel and on a shorter timeline, Framatome is also offering a near-term bridge: fuel fabricated to the same proven design currently used in these reactors, produced at its European facilities rather than sourced from Russia, giving operators a lower-risk interim option while VERA-440 works through qualification. Slovenské elektrárne has already contracted Framatome for supply beginning in 2027 on this basis.

"Security of energy supply is a strategic priority for us at Fortum," said Petra Lundström, the company's executive vice president for nuclear operations, framing the agreement in terms of diversifying the entire nuclear fuel value chain, not just fuel assemblies.

Framatome positions itself as the only supplier able to guarantee a fully sovereign European technology for VVER reactors, with design authority, fabrication, component sourcing, and transport packaging all located inside the EU. Whether that claim translates into licensed reloads across all 15 reactors depends on what the LTA campaigns deliver over the next several years, and how quickly Czech, Finnish, Hungarian, and Slovak regulators process what Framatome brings to them.