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Highlights
Terra Innovatum advanced licensing of the SOLO MMR with the U.S. NRC, including submission of technical documents and topical reports.
The Principal Design Criteria report was accepted for full review, with the NRC targeting completion by end-2025 and issuing a Safety Evaluation by April 2026.
SOLO MMR, a 1 MWe helium-cooled reactor using low-enriched uranium, is designed for modular deployment, small land footprint, and simplified operations.
Terra Innovatum Srl a developer of micro-modular nuclear reactors, together with GSR III Acquisition Corp. (Nasdaq:GSRT), a publicly listed special purpose acquisition company, announced notable progress in the licensing pathway for the Company’s SOLO Micro-Modular Reactor (SOLO MMR). The reactor is currently undergoing review by the U.S. Nuclear Regulatory Commission (NRC).
Regulatory Engagement Framework
In January 2025, prior to entering into a Business Combination Agreement (BCA) with GSR III Acquisition Corp. and announcing its plans to go public, Terra Innovatum submitted a Regulatory Engagement Plan to the NRC. This plan established a structured framework for interactions with the agency under the non-power reactor licensing pathway defined by NUREG-1537. Since that submission, the Company has been executing the plan in line with its timetable, advancing its discussions with the NRC.
To date, several technical documents, including white papers and topical reports, have been submitted and reviewed in meetings with NRC staff. These submittals have been structured to address individual chapters of the Company’s anticipated final licensing application. By proceeding in this stepwise manner, the NRC is able to evaluate key technical and safety elements of the SOLO MMR ahead of the complete filing.
Principal Design Criteria Submission
A key milestone in this process was achieved with the submission of the Principal Design Criteria (PDC) topical report. The PDC establishes the fundamental safety and design requirements forming the foundation for the SOLO MMR licensing review. Following a readiness assessment, the NRC accepted the report for full technical evaluation.
In a formal letter dated July 30, 2025, the NRC confirmed that it intends to complete its review of the PDC by the end of 2025 and issue a Safety Evaluation (SE) by April 2026. This timeline represents an important regulatory step for Terra Innovatum as it moves toward full licensing of the SOLO MMR.
SOLO Micro-Modular Reactor Design
The SOLO MMR is a helium-cooled reactor capable of producing 1 megawatt-electric (MWe) of output. It operates using commercially available low-enriched uranium fuel. Designed for scalability, the SOLO MMR offers modular construction, inherent safety characteristics, and simplified operations.
The reactor’s architecture supports deployment in remote or off-grid locations and requires a smaller land footprint compared to conventional nuclear facilities. Additionally, SOLO’s factory fabrication and modular replacement features aim to simplify maintenance and operational processes, positioning it as a flexible solution for industrial users requiring reliable heat and power supply.
Company Overview
Terra Innovatum’s stated mission is to expand the accessibility of nuclear power through micro-reactor technology. Its SOLO platform is designed to deliver affordable, deployable, and safe solutions at a capacity of 1 MWe per unit. The business combination with GSR III Acquisition Corp. provides the Company with a path to accelerate commercialization efforts and access public markets.
