Spotlight
Kaleidos
Project Overview
The U.S. Nuclear Regulatory Commission (NRC) is currently engaged in pre-application activities with Radiant Industries, Inc. (Radiant), starting in October 2022. Radiant is an El Segundo, CA company developing its Kaleidos design, a transportable micro-reactor designed to generate 3MWth and approximately 1MWe. The Kaleidos micro-reactor is a high-temperature gas-cooled reactor (HTGR) using TRISO fuel, helium gas coolant, and prismatic graphite blocks. Each micro-reactor will be fully contained in a single shipping container.
For more information, please see the Radiant pre-application documents (NRC Docket 99902106).
To subscribe to the Radiant Kaleidos email service, select Radiant Kaleidos from the Advanced Reactors list after entering your email into the GovDelivery system.
Pre-Application Activities
| Product | Type | Reference | Status |
| Radiant Kaleidos Micro-reactor Pre-application Regulatory Engagement Plan – October 2023 | Regulatory Engagement Plan | ML23286A328 | No review requested |
| 10 CFR 70 Gap Analysis | White Paper | ML24115A321 | ML24262A066 |
| 10 CFR Part 50 and 52 Gap Analysis | White Paper | ML24250A206 | ML25013A338 |
| 10 CFR Part 100 Gap Analysis | White Paper | ML24275A261 | ML25017A130 |
| 10 CFR Part 51 Gap Analysis | White Paper | ML24298A242 | ML25023A086 |
| 10 CFR Part 55 Gap Analysis | White Paper | ML25188A228 | Under Review |
| Kaleidos Fleet Operator Training White Paper | White Paper | Non-public proprietary | Under Review |
| Kaleidos Factory Fueling Operations | White Paper | ML25226A241 | No Review Requested |
Page Last Reviewed/Updated Friday, August 22, 2025
Page Last Reviewed/Updated Friday, August 22, 2025