Radiant wins DOE safety approval for full-power microreactor testing in Idaho
The general population usually only gets to enjoy projects after they have reached completion without necessarily understanding the various hurdles that companies have to overcome before a project can materialize. In previous years, it was made even harder for companies to receive approval to proceed with building a facility. Still, the clean energy transition encouraged nations to work with rather than against private companies so that as many projects as possible can be executed. Among the companies gaining momentum in the nuclear sector is Radiant, and it recently won DOE safety approval for full-power microreactor testing in Idaho.
An overview of Idaho’s ever-transforming nuclear energy landscape
Idaho’s nuclear energy sector is anchored by the Idaho National Laboratory, which is the premier federal nuclear research and development facility in the United States. The facility is located on an 889-square-mile site in southeastern Idaho and spans major facilities like the Materials and Fuels Complex, the Advanced Test Reactor Complex, and the Research and Education Campus in Idaho Falls.
There are also plenty of projects that are in the works in Idaho, as they aim to improve the state’s nuclear energy portfolio. For instance, in June 2026, startup Antares achieved criticality with its commercial demonstration reactor at INL under the Department of Energy’s Reactor Pilot Program, which has fostered an environment where nuclear energy companies are motivated to pursue initiatives.
The company is testing the design of its commercial reactor, the same unit-from fueling through 150 hours of continuous operation without operator assistance.
One of the standout initiatives came by in July 2026, when a $31 million federal grant from the U.S. Economic Development Administration was awarded to the INEC Tech Hub, led by the Idaho Advanced Energy Consortium across Idaho and Wyoming to support fuel fabrication, training, and supply chain growth.
A massive achievement: Radiant wins DOE safety approval for full-power microreactor testing
One of the facts that have been made clear in the energy sector during the clean energy transition is that there is a tremendous amount of profit available for companies who approach projects appropriately. A press release from Radiant Nuclear today announced that the U.S. Department of Energy (DOE) has granted approval of its Documented Safety Analysis (DSA).
The approval represents a massive milestone toward full-power testing of Radiant’s Kaleidos microreactor at Idaho National Laboratory (INL) and permits the company to move forward to DOE’s Readiness Review, the next step before nuclear operations can begin. The reason why the Department of Energy has expressed such great support toward nuclear energy projects is that the United States wants to maintain its position as the leading nuclear energy-producing country in the world, both for electricity and security reasons.
Unpacking the overall influence that Radiant Energy has had on the energy sector
Radiant is a leading developer of advanced nuclear technologies that is focused on delivering reliable, resilient, and scalable energy solutions that are transportable by land, sea, and air. Radiant is dedicated to allowing a new generation of nuclear applications for commercial, industrial, and defense customers. Because of the company’s success and overall good reputation, industry experts believe it can play an integral role in shaping the future direction of the United States’ nuclear energy sector.
Looking further: What impact does the latest project have on Radiant Energy?
The reactor that is being tested at INL uses an identical reactor design and custom-designed fuel as the units Radiant plans to deliver to customers, making the test a crucial step toward commercial deployment. The company is pleased with the DOE’s approval, which provides it with a platform to showcase its technology. The company is testing the design of its commercial reactor, the same unit-from fueling through 150 hours of continuous operation without operator assistance.
Radiant’s scheduled testing at INL will be the industry’s only full-power extended-duration demonstration of a nuclear microreactor to date. In addition to achieving criticality, Radiant is set to test the same Kaleidos unit for 60 effective full power days (EFPD) over several months, demonstrating its performance under real operating conditions.
Prince is a versatile writer focused on energy, automotive, environmental, and general news topics. He makes complex technical and policy issues clear, engaging, and accessible for a broad audience.
