Sweden-based small modular reactor (SMR) developer Blykalla and global engineering company ABB have signed a memorandum of understanding to develop advanced nuclear reactor technology and potentially build an electrical SMR pilot facility near the existing Oskarshamn nuclear power station south of Stockholm.

Blykalla said the SMR pilot facility, which will not use nuclear fuel, will test proof of concept before expanding to future plants.

ABB, a Swedish-Swiss multinational, will explore how its automation, electrification and digitalisation solutions can support Blykalla’s SMR prototype the Sealer-E, which features an electric lead-cooled reactor. This includes cyber security frameworks to ensure compliance with nuclear safety regulations.

Lead-cooled nuclear plants are not yet operating, but are being developed as next-generation, or Generation IV, reactors. Lead has a very high boiling temperature of 1,749°C which means the problem of coolant boiling is for all practical purposes eliminated. This brings with it important safety advantages that also result in design simplification and improved economic performance.

ABB’s expertise of power distribution, control and automation technologies, and system integration, will “lay the groundwork” for a successful deployment of advanced nuclear technologies as part of the collaboration, a statement said.

Blykalla’s Sealer SMR plant uses liquid lead cooling and has what the company said are unique safety elements and proprietary innovations.

The company said it wants to provide baseload energy to enable a complete transition to a fossil-free future and is collaborating with partners to deliver Sweden’s next nuclear reactor within this decade.

Blykalla announced in September that it had doubled the capital raised in an early-stage investment round to €14m ($15.2m) as it seeks to industrialise its Sealer design.

Focus Is On Two Advanced Reactor Projects

Blykalla is focused on two projects – the construction of the electric Sealer-Enon-nuclear prototype test reactor at Oskarshamn and the development of its flagship advanced reactor design demonstrator the Sealer-One.

Blykalla said earlier that the funds announced in September will primarily be used for the construction of the prototype test reactor in collaboration with utilities OKG and Uniper, and the continued design and development of the Sealer-One.

The Oskarshamn prototype will be used for materials testing at high temperature, including testing of Blykalla’s innovative corrosion-tolerant steel alloys, which are expected to enable the efficient cooling of liquid lead.

Blykalla has also signed an MOU with Sweden-based nuclear engineering and services company Studsvik to conduct a feasibility study on the construction and operation of a demonstration Sealer reactor with associated infrastructure for fuel fabrication in Nyköping, south of Stockholm.

According to Blykalla, construction of the electric prototype reactor is expected to start at Oskarshamn by the end of 2024. A demonstration deployment of the actual Sealer-One lead-cooled reactor is expected by the end of the decade.

Sweden’s six commercial nuclear power plants provide almost 30% of the country’s electricity. In November 2023, the government unveiled a roadmap to expand nuclear energy, increasing new capacity by 2,500 MW by 2035 and building up to 10,000 MW by 2045, which could include SMRs.