Terra Innovatum SOLO
Project Overview
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. The reactor is intended to feature autonomous operation, on-line safeguards-by-design, and a defense-in-depth structure of radiological barriers with the intent to minimize or eliminate emergency planning zone (EPZ) requirements beyond the operational boundary.
For more information, please see the Terra Innovatum SOLO pre-application documents (NRC Docket 99902138).
To subscribe to the Terra Innovatum SOLO email service, select Terra Innovatum SOLO from the Advanced Reactors list after entering your email into the GovDelivery system.
Pre-Application Activities
| 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 | Under review |
| 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 |
Contacts
| Contacts for the Terra Innovatum SOLO Pre-Application Review | |
|---|---|
| Lead Project Manager | Jacqueline Tulip |
| Contact a Public Affairs Officer | |
Page Last Reviewed/Updated Tuesday, May 05, 2026
Page Last Reviewed/Updated Tuesday, May 05, 2026