Tracker · Pre-application
Terra Innovatum (SOLO)
The U.S. Nuclear Regulatory Commission (NRC) is currently engaged in pre-application activities with Terra Innovatum as of January 2025. Terra Innovatum is developing its SOLO micro modular reactor design, intended to form the basis for a scalable modular energy platform from MWe to GWe-class. A SOLO unit is designed to deliver approximately 1MWe. The design features a solid heterogeneous composite moderator and is intended to accommodate both traditional zircaloy-clad low-enriched uranium (LEU) fuel or, when available, LEU+ and high-assay low-enriched uranium (HALEU) fuels. Heat removal is accomplished by helium gas which eliminates the need for water from the reactor coolant system.
- Who
- Not stated
- Design
- SOLO
- Reactor type
- High Temperature Gas Reactors
- Status
- Active on the NRC index
- What
- Not stated
- When
- Not stated
- Site
- Not stated on the NRC page in this snapshot.
- NRC page reviewed
- Tuesday, September 15, 2026
Dockets
Status timeline
Dates are printed as the NRC page prints them, including the actual (A) or target (T) mark.
The NRC page in this snapshot does not list a milestone table.
NRC activity table
| Product | Type | Reference | Status |
|---|---|---|---|
| SOLO Micro Modular Nuclear Reactor Regulatory Engagement Plan, Rev 0 | Regulatory Engagement Plan | ML25017A401 | No review requested |
| SOLO Micro Modular Nuclear Reactor Regulatory Engagement Plan, Rev 1 | Regulatory Engagement Plan | ML25159A006 | No review requested |
| Design Considerations on Reactor Core (Fuel) at Nominal Conditions, Rev 0 | White Paper | ML25159A010 | Feedback ProvidedML26027A159 |
| Proposed Preliminary Safety Analysis Report Content and Exceptions, Rev 0 | White Paper | ML25159A011 | Under review |
| Transportation and Logistics for SOLO Research and Test Reactor Deployment, Rev 0 | White Paper | ML25159A008 | Under review |
| SOLO Micro Modular Nuclear Reactor Principal Design Criteria, Rev 0 | Topical Report | ML25159A013 | Under review |
| SOLO Micro Modular Nuclear Reactor Regulatory Engagement Plan, Rev 2 | Regulatory Engagement Plan | ML25265A290 | No review requested |
| Source Term Characterization Methodology, Rev 0 | White Paper | ML25257A011 | Under review |
| SOLO Project Quality Plan, Rev 0 | Topical Report | ML25257A012 | Under review |
| SOLO Safeguards Methodology and Implementation of the Material Control & Accountancy (MC&A), Rev 0 | Topical Report | ML25257A014 | Under review |
| SOLO Micro Modular Nuclear Reactor Regulatory Engagement Plan, Rev 3 | Regulatory Engagement Plan | ML26002A089 | No review requested |
| Rock City Admiral Parkway (IL) Site Characteristics Preliminary Analysis, Rev 0 | White Paper | ML25333A003 | Under review |
| SOLO Reactor Module and Biological Shield Module Description, Rev 0 | White Paper | ML25341A003 | Under review |
| SOLO Pre-FOAK Test Plan, Rev 0 | White Paper | ML25361A004 | Under review |
| SOLO Thermal-Hydraulic Design, Rev 0 | White Paper | ML26027A146 | Under review |
| SOLO Nuclear Design, Rev 0 | Topical Report | ML25341A005 | Under review |
| SOLO I&C Architecture and Design Basis for Reactor Protection System (RPS), Rev 0 | Topical Report | ML26060A004 | Under review |
| External and Internal Hazards Analysis and Safety Basis Event Identification for SOLO Non-Power Reactor, Rev 0 | White Paper | ML26047A006 | Under review |
Related Federal Register notices
Included when a notice shares a docket printed on the NRC page, or when the notice title repeats the project or design name. Other NRC notices are left out.
No in-scope Federal Register notice is linked to this project.