US Licensing Process Begins for Aalo-1 Microreactor

Aalo Atomics Advances Towards Licensing Its Innovative Aalo-1 Microreactor

Editorial Team (ET)October 1, 2026

Aalo Atomics is making significant strides in the nuclear energy sector with its innovative Aalo-1 microreactor. The company has submitted a pre-application regulatory engagement plan (REP) with the US Nuclear Regulatory Commission (NRC), marking a crucial step towards licensing and deploying this advanced technology. This article delves into the details of the Aalo-1 microreactor, the importance of the REP, and Aalo's ambitious plans for the Idaho Nuclear Project.

The Regulatory Engagement Plan (REP)

The Regulatory Engagement Plan (REP) is a strategic document designed to facilitate early interactions between reactor developers and NRC staff. Although not a regulatory requirement, an REP helps reduce regulatory uncertainty and adds predictability to the licensing process for advanced technologies. It outlines the planned pre-licensing application interactions with the regulator, allowing developers to address any questions or concerns early on.

Aalo's Commitment to Safety and Trust

Aalo Atomics is committed to creating a safe, socially acceptable, and commercially viable Aalo-1 reactor. By setting clear expectations and building trust with the NRC, Aalo aims to address regulatory concerns proactively. "By setting expectations, building trust, and addressing the NRC's questions and concerns early on, we aim to create a safe, socially acceptable, and commercially viable Aalo-1 reactor for the Idaho Nuclear Project," stated the company.

Project Overview: Idaho Nuclear Project

The Idaho Nuclear Project is an ambitious initiative featuring seven independent Aalo-1 reactors, with plans for potential expansion to an additional seven units. This project represents a significant leap for small reactor clusters in the US, promising affordable and reliable electricity to meet current and future energy needs. Aalo's vision includes having the project operational by 2029.

Significance of Multiple Reactors at One Site

Deploying multiple reactors at a single site is a game-changer for the US nuclear industry. It not only maximizes the efficiency of the nuclear power plant but also enhances energy sustainability. The Idaho Nuclear Project will help Aalo's partner utility provide affordable, reliable electricity, ensuring a steady supply to meet increasing demands.

Conceptual Design of Aalo-1

The Aalo-1 microreactor is a factory-fabricated 10 MWe sodium-cooled reactor that uses uranium zirconium hydride (UZrH) fuel elements. Completed in May, the conceptual design of Aalo-1 highlights its innovative features and technical specifications. This design sets the foundation for the reactor's development and eventual deployment.

Non-Nuclear Prototype Development

To ensure the Aalo-1 microreactor meets its technical, regulatory, and economic targets, Aalo plans to construct a full-scale, non-nuclear prototype. This prototype will be used to test and refine the reactor's technology, addressing any potential issues before full-scale production and deployment.

Siting Memorandum of Understanding (MoU) with DOE

In May, Aalo signed a siting memorandum of understanding (MoU) with the Department of Energy (DOE), marking the first step towards deploying its first Aalo-1 reactor at the Idaho National Laboratory (INL) site in Idaho. This strategic location will facilitate collaboration with INL's projects and enhance the reactor's integration into the existing infrastructure.

Collocation with Hydrogen Motorcoach Fleet

The proposed site at INL's Central Facilities Area will allow the Aalo-1 reactor to collocate with newly constructed megawatt-scale electrolyzers and INL's upcoming hydrogen motorcoach fleet. This integration aims to support hydrogen production and utilization, contributing to the broader goals of energy transition and sustainability.

Combined Construction and Operating Licence Application (COLA)

Aalo plans to submit a combined construction and operating licence application (COLA) for the Idaho Nuclear Project in 2026. The COLA is a critical component of the licensing process, encompassing both the construction and operational phases of the reactor, ensuring compliance with all regulatory requirements.

GAIN Voucher Award and Its Impact

In December last year, Aalo was among the first FY2024 recipients of GAIN vouchers. The federally funded vouchers, part of the Gateway for Accelerated Innovation in Nuclear (GAIN) initiative, provide companies access to the extensive nuclear research capabilities and expertise of the US Department of Energy's national laboratory complex. These vouchers are pivotal in accelerating the innovation and application of advanced nuclear technologies.

Collaboration with INL

Aalo's collaboration with INL focuses on evaluating modeling and simulation capabilities for the fuel and core system of the Aalo-1 microreactor. This partnership leverages INL's expertise and resources, ensuring the Aalo-1 microreactor's design and performance meet the highest standards.

Innovative Aspects of Aalo-1

The Aalo-1 microreactor boasts several unique features and technological advancements that set it apart from traditional reactors. Its factory-fabricated design, sodium-cooling system, and use of UZrH fuel elements highlight Aalo's commitment to innovation and efficiency in nuclear energy.

Challenges and Opportunities

While the path to licensing and deploying the Aalo-1 microreactor presents challenges, such as regulatory hurdles and technical refinements, it also offers significant opportunities. The successful deployment of Aalo-1 can revolutionize the nuclear energy landscape, providing a reliable and sustainable energy source.

Conclusion

Aalo Atomics is at the forefront of nuclear innovation with its Aalo-1 microreactor. The submission of the REP to the NRC, along with strategic collaborations and innovative designs, positions Aalo for success. As the company progresses towards its goal of deploying the Aalo-1 reactor, it continues to pave the way for a new era in nuclear energy.

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