A US energy firm has taken a pioneering step toward next-generation nuclear power by successfully 3D-printing a solid-state thorium reactor core and pressure vessel. This breakthrough marks progress toward a fully factory-built thorium nuclear system designed to be safer and more scalable than traditional uranium reactors.
The Florida-based company, AMPERA, aims to produce nuclear modules that rely on subcritical physics, ensuring inherent safety without the need for active control systems. By using additive manufacturing, they hope to create mass-producible, factory-built reactors that address current nuclear challenges and can be deployed rapidly.
Thorium reactors have drawn global interest for their potential safety, reduced long-term radioactive waste, and lower risk of weaponization compared to uranium-based reactors. Thorium’s subcritical operation limits meltdown risks while producing less hazardous spent fuel. This technical edge arrives as geopolitical and climate pressures push countries to explore cleaner, reliable energy sources.
China’s claim of operating a thorium molten salt reactor since late 2023 has intensified US efforts to lead in advanced nuclear technologies. AMPERA's approach combines solid-state reactor design with 3D printing to accelerate development timelines and lower construction costs. Unlike molten salt reactors, this design does not rely on fluid fuels, potentially simplifying safety and maintenance.
Experts note that AMPERA’s reactor module avoids dependence on electronically controlled safety mechanisms, instead leveraging physical design and material properties to achieve passive safety. This reduces complexity and operational risks, a critical factor for public acceptance and regulatory approval.
The project also addresses US energy security by reducing reliance on foreign uranium enrichment, particularly from Russia, which controls a significant portion of the global market. Thorium’s abundant supply and different fuel cycle could diversify and stabilize the nuclear fuel supply chain.
This technological advancement aligns with a broader surge in nuclear energy interest driven by climate change mitigation, energy independence, and increased electricity demand from emerging industries such as artificial intelligence. Although hurdles remain before commercial deployment, AMPERA’s success with 3D printing represents a measurable stride in reshaping nuclear power’s future.