Centrus to supply Radiant with microreactor fuel

Introduction

Centrus Energy, a leading U.S. uranium enrichment firm, has entered a multi‑year agreement with Radiant, a California‑based developer of nuclear microreactors. The deal secures a supply of high‑assay, low‑enriched uranium (HA‑LEU) fuel that Radiant will use to launch a series of its Kaleidos microreactors. This partnership signals a concrete step toward commercializing compact nuclear power systems that could serve remote or off‑grid locations.

What Happened

In a definitive contract signed earlier this month, Centrus committed to provide Radiant with HA‑LEU fuel for multiple Kaleidos units. The agreement covers several years of deliveries, ensuring that Radiated’s microreactor fleet will have a reliable fuel source as it moves from prototype testing to field deployment. Both companies highlighted the deal as a milestone that bridges fuel production capabilities with emerging reactor designs.

The Kaleidos microreactor is a 4‑megawatt electric (MWe) system designed for rapid installation, modular construction, and minimal on‑site staffing. By securing fuel from Centrus, Radiant can focus on scaling production, obtaining regulatory clearances, and targeting markets such as remote communities, military installations, and industrial sites that need resilient, low‑carbon power.

Key Details

HA‑LEU fuel, enriched to between 5 % and 20 % uranium‑235, offers a higher energy density than conventional low‑enriched uranium (LEU) used in larger reactors. This enrichment level enables the Kaleidos design to achieve longer core life and fewer refueling outages, which is critical for isolated applications. While the exact volume of uranium to be supplied remains confidential, the contract’s multi‑year horizon suggests a commitment to dozens of reactor deployments.

Radiant’s reactor architecture incorporates passive safety features, such as natural circulation cooling and a sealed fuel module that can be removed and replaced without extensive site work. The HA‑LEU fuel is fabricated into compact, corrosion‑resistant plates that fit within the reactor’s core, delivering stable power output while meeting stringent safety standards set by the Nuclear Regulatory Commission (NRC) and international bodies.

Background

Microreactors have emerged as a focal point of the next wave of nuclear innovation. Unlike traditional gigawatt‑scale plants, these small‑footprint reactors can be factory‑built, shipped, and installed in weeks rather than years. Their size and modularity make them attractive for regions lacking grid infrastructure, disaster‑relief scenarios, or sites where space and capital are limited.

Centrus Energy, spun out of the U.S. Department of Energy’s enrichment program, specializes in producing HA‑LEU for advanced reactor concepts, including fast reactors and small modular reactors (SMRs). By diversifying its customer base beyond legacy utilities, Centrus is positioning itself as a key fuel supplier for the emerging market of next‑generation nuclear technologies.

Why It Matters

The agreement underscores the growing confidence in microreactor technology as a viable component of the clean‑energy transition. Reliable fuel supply is often cited as a barrier to commercial deployment; this contract removes that uncertainty for Radiant, allowing the company to accelerate its go‑to‑market strategy and demonstrate the technology’s real‑world performance.

From a policy perspective, the partnership aligns with U.S. goals to expand domestic nuclear capabilities and reduce greenhouse‑gas emissions. By supporting a home‑grown fuel supplier and a domestic reactor developer, the deal strengthens the national nuclear supply chain and showcases a pathway for low‑carbon, resilient power generation in underserved areas.

What Happens Next

Radiant will begin fabricating its first batch of Kaleidos reactors, targeting pilot installations in select U.S. locations by late 2025. Parallel to hardware development, the company will engage with the NRC to secure design certification and operating licenses, a process that could set precedents for future microreactor approvals.

Centrus, meanwhile, will ramp up its HA‑LEU production capacity to meet the scheduled deliveries, investing in additional enrichment cascades and quality‑control systems. Both firms anticipate that successful early deployments will open doors to international markets, where demand for compact, low‑carbon power solutions is rising.

Conclusion

The Centrus‑Radiant fuel agreement represents a pivotal convergence of nuclear fuel expertise and innovative reactor design. By guaranteeing a steady supply of HA‑LEU, the contract removes a critical hurdle for the Kaleidos microreactor program, paving the way for faster commercialization and broader adoption of small‑scale nuclear power. As the energy landscape shifts toward decarbonization, such collaborations will be essential in delivering reliable, clean electricity to the places that need it most.