# Did Radiant Just Win the Biggest Microreactor Contract in U.S. History?

[Radiant Industries](https://smrintel.com/companies/radiant-industries) has secured up to $750 million from the U.S. Army's Project Janus program — the largest single award in that program — to deploy 15 factory-built Kaleidos microreactors at military installations, with a first three-unit cluster at Fort Benning, Georgia targeted for operation by September 2028. The Army announced on August 26 that Project Janus will distribute up to $2.2 billion across five vendors through fiscal 2031, with deployments spanning more than 20 microreactors across Defense Department installations. Radiant's share is the largest disclosed award in the program. The company raised more than $300 million in December 2025 to fund commercialization and its R-50 manufacturing facility in Oak Ridge, Tennessee, which is designed to scale to 50 reactors per year. Separately, data center operator Equinix announced a preorder for 20 Kaleidos units in August 2025. What was a venture-backed startup with a compelling pitch is now a company with a named deployment site, a named government customer, and a hard delivery deadline.

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## What Is Project Janus and Who Else Won Awards?

The U.S. Army's Project Janus, administered with the Defense Innovation Unit, intends to field operational microreactors at domestic military bases to reduce grid dependence. The strategic logic is straightforward: a base drawing power entirely from the civilian grid carries a vulnerability that storms, cyberattacks, and transmission failures can exploit. The Army wants reactors operating before those scenarios materialize.

The five awarded vendors and their initial deployment sites, as announced August 26, are:

- **Radiant Industries** — Fort Benning, Georgia (up to $750M)
- **Antares Nuclear** — Fort Bragg, North Carolina
- **BWXT Advanced Technologies** — Fort Campbell, Kentucky
- **General Atomics Electromagnetic Systems** — Fort Hood, Texas
- **[Westinghouse](https://smrintel.com/companies/westinghouse) Government Services** — Fort Drum, New York

Total program ceiling: up to $2.2 billion through fiscal 2031. The Army expects more than 20 microreactors deployed across DOD installations when private capital is counted alongside federal funding.

The five-vendor structure is deliberate. DOD is not betting the entire program on any single technology or contractor. [BWX Technologies](https://smrintel.com/companies/bwxt) and Westinghouse carry decades of naval nuclear pedigree. General Atomics has operated reactors. Radiant is the youngest company in the group by a substantial margin, which makes the scale of its award — the largest in the program — notable and worth scrutiny.

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## What Is the Kaleidos Reactor?

Kaleidos is Radiant's 1-megawatt-electric microreactor, designed as a sealed, fueled unit transportable by land, sea, or air. Key specifications cited by the company: a five-year operational period before refueling, a 20-year design life, and no requirement for cooling water. Spent fuel handling and refueling return to Radiant rather than remaining at the customer site — a detail that matters for remote or expeditionary military deployments where long-term waste storage is operationally untenable.

The no-cooling-water claim points toward a [heat pipe reactor](https://smrintel.com/glossary/heat-pipe-reactor) architecture, a design family being pursued by multiple developers for exactly these austere-environment applications. The source material does not specify fuel type or enrichment level, so no fuel specifications are stated here.

The factory-production model is central to Radiant's commercial thesis. A microreactor requiring bespoke civil construction at every site is effectively a small nuclear plant with a startup's marketing materials. Radiant's R-50 factory in Oak Ridge — the city whose entire identity is rooted in the Manhattan Project and subsequent DOE complex — is designed to manufacture at volume. The company has stated a target of 50 reactors per year within a few years of production beginning in 2028.

That schedule alignment is tight: the Army wants the first Fort Benning reactor operating by September 2028, which is roughly when Radiant says factory production begins. There is no margin for slippage on either track.

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## The DOME Test Is the Real Near-Term Milestone

Before any of the Fort Benning hardware matters, Radiant needs to demonstrate that Kaleidos produces measured nuclear power under controlled conditions. The Department of Energy selected Radiant and [Westinghouse](https://smrintel.com/companies/westinghouse) in 2025 for the initial test queue at Idaho National Laboratory's [DOME Test Facility](https://smrintel.com/glossary/dome) — the Demonstration of Microreactor Experiments facility purpose-built to provide fast, iterative testing for advanced microreactor designs.

Radiant has stated its Kaleidos Demonstration Unit is on track for testing at DOME in 2026. That test — if it runs on schedule and produces clean data — is the single most important validation event between now and the Fort Benning deadline. Advanced nuclear has accumulated a long history of compelling simulations and attractive renderings. A reactor that reaches [criticality](https://smrintel.com/glossary/criticality) and generates measurable electrical output at DOME changes the evidentiary basis for everything that follows.

Until then, every deployment claim carries the qualifier that the core physics have not yet been demonstrated at operating scale.

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## Regulation: Army Authority, Not NRC

A detail with significant implications: the source material notes that Army Janus reactors will be regulated by the Army rather than the Nuclear Regulatory Commission, while still following applicable environmental and safety rules. This is consistent with the legal framework governing nuclear materials on federal property and mirrors the approach used for naval reactors operated by the U.S. Navy under a separate regulatory structure.

For Radiant, this means the Fort Benning deployment does not depend on completing an NRC [design certification](https://smrintel.com/glossary/design-certification) process — a path that has taken a decade or more for commercial reactor developers. That is a meaningful near-term operational advantage. It does not, however, substitute for NRC review if Radiant intends to sell Kaleidos units to commercial customers like Equinix in the United States. The civilian and military regulatory tracks remain distinct.

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## The Equinix Signal: Military to Commercial Pipeline

[Oklo Inc.](https://smrintel.com/companies/oklo) is not the only advanced reactor company pursuing the data center market. Equinix announced in August 2025 that it had signed a preorder agreement for 20 Kaleidos microreactors, framing the deal as part of a broader effort to secure firm [baseload power](https://smrintel.com/glossary/baseload) for AI-ready data centers. Equinix's disclosed nuclear pipeline also includes agreements with Oklo, ULC-Energy with [Rolls-Royce SMR Ltd](https://smrintel.com/companies/rolls-royce-smr), and Stellaria, alongside additional fuel cell capacity from Bloom Energy.

The Army contract reinforces Radiant's commercial position with data center buyers in a specific way: it provides a credible delivery schedule. A hyperscaler signing a preorder for reactors that have no demonstrated path to production carries significant counterparty risk. A hyperscaler signing for reactors that have a $750 million government contract, a named factory site, and a 2028 start date has a different risk profile — still substantial, but grounded in real procurement rather than speculative timelines.

That said, 20 preordered units for Equinix plus 15 Army units totals 35 reactors against a factory capacity target of 50 per year. The manufacturing ramp is the binding constraint. If the R-50 factory in Oak Ridge hits its production targets, Radiant has a credible path to meaningful fleet scale by the early 2030s. If the factory slips — as [FOAK](https://smrintel.com/glossary/foak) manufacturing facilities frequently do — both the military schedule and the commercial pipeline compress simultaneously.

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## Industry Trajectory: What This Means Beyond Radiant

The Janus program's five-vendor structure, aggregate ceiling of $2.2 billion, and named deployment sites represent the most concrete federal commitment to operational microreactor deployment in U.S. history. For the broader advanced nuclear sector, several implications follow:

**Manufacturing credibility matters more than design elegance.** The companies that win the next round of military and commercial contracts will be those that can demonstrate factory throughput, not just reactor physics. Radiant's Oak Ridge facility and its production timeline will be studied closely by every competitor.

**Dual-use customer stacks are becoming standard.** Radiant has military contracts and data center preorders. [Oklo](https://smrintel.com/companies/oklo) has pursued similar parallel tracks. The implicit argument is that defense deployments de-risk commercial products by proving operational reliability under stringent conditions — a logic the DOD has used to accelerate technologies from GPS to advanced materials.

**The 2028 proof point is sector-wide.** If Radiant's Fort Benning installation and DOME test both deliver on schedule, it provides evidence that the factory-microreactor model works. If either slips significantly, it will sharpen skepticism about every other developer's timeline claims. The sector needs a machine that produces measured power, not additional slide decks.

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## Key Takeaways

- Radiant Industries holds the largest single award under Army Project Janus: up to $750 million for 15 Kaleidos microreactors.
- The full Janus program spans five vendors and up to $2.2 billion through fiscal 2031, with named sites at Fort Benning, Fort Bragg, Fort Campbell, Fort Hood, and Fort Drum.
- First operational deadline: three Kaleidos units at Fort Benning by September 2028, coinciding with planned start of factory production at Radiant's Oak Ridge R-50 facility.
- Army Janus reactors fall under Army regulatory authority, not NRC oversight — accelerating the military deployment path but leaving the commercial NRC track unresolved.
- Radiant's DOME test at Idaho National Laboratory, stated for 2026, is the critical near-term technical validation before any hardware ships.
- Equinix has a preorder for 20 Kaleidos units, making Radiant's customer stack span both DOD and hyperscaler buyers — with the Army contract providing schedule credibility to the commercial pipeline.
- Radiant raised more than $300 million in December 2025 to fund the factory and commercialization; the Army contract now anchors that investment thesis.

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## Frequently Asked Questions

**What is Project Janus?**
Project Janus is a U.S. Army program, administered with the Defense Innovation Unit, to deploy operational nuclear microreactors at domestic military bases. The Army announced on August 26 that the program will award up to $2.2 billion across five companies through fiscal 2031, targeting more than 20 microreactors across DOD installations.

**How much did Radiant Industries win from the Army?**
Radiant was awarded up to $750 million under Project Janus — the largest single disclosed award in the program — to develop and deploy 15 Kaleidos microreactors, starting with three units at Fort Benning, Georgia.

**What is the Kaleidos microreactor?**
Kaleidos is Radiant's 1-megawatt-electric microreactor, designed as a factory-built, sealed, transportable unit that can operate for up to five years before refueling, requires no cooling water, and returns to Radiant for refueling and spent-fuel handling rather than leaving waste at the deployment site.

**Does Radiant need NRC approval to deploy at Fort Benning?**
Not for the military installation. According to the source material, Army Janus reactors will be regulated by the Army rather than the Nuclear Regulatory Commission, while still following applicable environmental and safety rules. Commercial deployments to non-federal customers would require separate NRC review.

**When will the Kaleidos reactor be tested?**
Radiant has stated its Kaleidos Demonstration Unit is on track for testing at Idaho National Laboratory's DOME facility in 2026. That test is the primary technical validation milestone before any production units ship to military or commercial customers.

**Who are the other Project Janus vendors?**
Antares Nuclear (Fort Bragg), BWXT Advanced Technologies (Fort Campbell), General Atomics Electromagnetic Systems (Fort Hood), and Westinghouse Government Services (Fort Drum) each received Janus awards alongside Radiant. Radiant's award is the largest disclosed among the five.