The project is being led by the National Nuclear Energy Commission (Comissão Nacional de Energia Nuclear, CNEN) and brings together a consortium of public and private entities including Diamante Energia, Núcleo Brasil Energia, Terminus, the Brazilian Navy, research institutes such as the Institute of Energy and Nuclear Research (IPEN) and the Institute of Nuclear Engineering (IEN), along with fuel and engineering supplier Industrias Nucleares do Brasil (INB). A funding grant of BRL30 million is provided by the innovation agency Finep, with the remaining BRL20 million sourced from private partners, underpinning the government’s commitment to fostering clean, safe, and autonomous energy technologies.
Designed to fit within a standard 40-foot shipping container, the microreactor is engineered to deliver sufficient power for remote towns, hospitals, military bases, and industrial facilities—serving roughly 1,000 inhabitants per unit—and markedly reduce reliance on diesel-based generators. The technology integrates advanced materials such as uranium, beryllium, and niobium alloys, some processed through additive manufacturing for enhanced precision and performance. The reactor will employ low-enriched uranium dioxide fuel enriched up to 20%, significantly higher than Brazil’s existing reactors, Angra 1 and 2, which operate with 5% enrichment.
Central to the system’s innovation is its passive safety design and heat pipe coolant technology. The cooling system is under evaluation, weighing options between sodium and a eutectic sodium-potassium alloy due to their favorable thermal conduction and operating range characteristics. Thermal energy conversion will occur via either a closed Brayton cycle—using inert gases like helium or carbon dioxide coupled with a microturbine—or a Stirling cycle system employing a piston driven by temperature-induced gas expansion for efficient electricity generation.
The microreactor development began in March 2025 and is currently at Technology Readiness Level (TRL) 3, encompassing mathematical modeling and preliminary studies. The project’s ambitious goal is to reach TRL 6 within three years, validating the technology in relevant operational environments and initiating formal regulatory approval processes. If successful, the first operational units could be deployed within eight to ten years.
Brazil’s nuclear microreactor venture aligns with the national agenda emphasizing technological sovereignty, energy diversification, and industrial reindustrialization. The project benefits from decades of accumulated expertise, drawing upon Brazil’s naval nuclear propulsion program and research institutions’ capabilities. Research components include testing neutron behavior in reduced-scale cores, instrumentation innovation, and development of safety and remote monitoring systems.
Internationally, microreactors—smaller than small modular reactors (SMRs)—are gaining attention for their portability and ease of deployment, especially in isolated regions lacking robust grid infrastructure. Brazil’s microreactor design offers unique advantages through its containerized format and extended operational autonomy, setting the stage to become a competitive player in the emerging global microreactor market.
Complementing this domestic initiative, Brazil is also exploring collaboration with Russia on SMR technologies, reflecting a broad strategic push to strengthen the country’s nuclear sector and expand clean energy capacity. Meanwhile, the ongoing and sporadically halted construction of Angra 3, with its planned 1405 MW reactor, continues to progress amidst political and financial challenges.
With hydropower dominance facing limitations due to climatic variability and environmental concerns, Brazil’s investment in microreactor technology signals a critical advancement toward a diversified, low-carbon energy matrix capable of serving its vast and varied geography with high safety, reliability, and minimal emissions.
This article was curated and published as part of our South American energy market coverage.
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