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Blykalla launches an electric SMR prototype in Sweden

Swedish developer Blykalla has begun construction of a pilot facility to test a prototype of an advanced modular reactor. This project aims to validate key components and safety systems, with the support of industrial partners and public funding.

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Swedish developer Blykalla has taken a significant step in nuclear innovation with the launch of a pilot site dedicated to its advanced modular reactor prototype. Located near Oskarshamn, this technological trial aims to demonstrate the feasibility of its SEALER-E concept, an electric reactor based on lead-cooled technology.

A project supported by industrial and institutional players

The project brings together several industrial partners, including Uniper, ABB, and NCC, as well as the Royal Institute of Technology (KTH). The construction of the facility has been entrusted to NCC AB, which will handle site preparation and necessary infrastructure. Additionally, the Swedish Energy Agency has allocated a grant of SEK 99 million (approximately USD 9.3 million) to support the initiative.

The groundbreaking ceremony was attended by Swedish Deputy Prime Minister and Minister of Energy Ebba Busch. The project illustrates the country’s commitment to strengthening its expertise in advanced reactors and diversifying its energy approach through innovative technologies.

A testing phase planned for late 2025

The first phase of construction is expected to be completed by June 2025, with testing scheduled to begin during the third quarter of the same year. This pilot site will be used to test critical components and safety systems before moving to a larger-scale development phase.

Blykalla, formerly known as LeadCold, emerged from research conducted since 1996 at KTH on lead-cooled reactors. Founded in 2013, the company is developing SEALER technology, with the goal of commissioning its first commercial SEALER-55 reactor by the early 2030s.

Towards the expansion of SEALER technology

The prototype currently being tested is expected to pave the way for a demonstration version, SEALER-D, with a thermal power output of 80 MW. Like Blykalla’s future commercial reactors, this facility will use approximately 800 tonnes of liquid lead to cool its fuel rods. With a height and diameter of about five meters, the concept is designed for long-term optimized operation.

The target for 2030 is to commission a commercial SEALER-55 reactor with a thermal power output of 140 MW. If ongoing tests prove successful, this technology could represent a significant advancement in the field of advanced modular reactors.

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