Blykalla, a Swedish nuclear technology company, has submitted an application for government approval to construct a power station comprising eight small lead-cooled reactors in the Tierp municipality. The proposed facility at Untra aims to deliver up to 440 megawatts (MW) of clean energy, marking a significant step in Sweden’s pursuit of advanced nuclear technologies.
The plant's reactors will utilize lead as a cooling agent instead of traditional water-based systems. Lead cooling offers enhanced safety and efficiency by operating at low pressure and high temperatures, reducing risks of coolant loss and improving heat transfer. This approach reflects a growing interest worldwide in small modular reactors (SMRs) that promise flexible deployment and improved economics.
The eight-reactor configuration will collectively provide a reliable and scalable energy source intended to support Sweden’s energy transition goals. Small lead-cooled reactors are designed to be modular and factory-built, which could shorten construction times and lower initial investment compared to conventional nuclear power plants.
Blykalla's submission is part of a broader European trend exploring new nuclear technologies to replace fossil fuels and ensure stable power supply amid growing demand for carbon-neutral energy. If authorized, the Untra project would become one of the first commercial-scale implementations of lead-cooled SMRs, potentially setting a precedent for future nuclear developments in the region.
Swedish authorities will evaluate the application considering regulatory, environmental, and safety standards. The decision process will include assessments of the project's technical feasibility, site suitability, and alignment with national energy policy objectives. Meanwhile, Blykalla continues to advance its reactor design, focusing on safety features and operational efficiency to meet stringent nuclear industry requirements.