Pentagon Selects Indiana Navy Base for First Domestic Nuclear Microreactor

To defense strategists, a domestic military base tethered to the civilian electrical grid is a sitting duck—a critical node whose operations can be severed by a cyberattack, an extreme weather event, or a physical strike on a local substation. To non-proliferation advocates and local safety skeptics, severing that tether by placing a novel nuclear reactor inside a domestic military installation trades one vulnerability for another, introducing radioactive waste management and new physical targets to civilian-adjacent communities. That tension is now moving from theoretical wargaming to physical infrastructure. On September 9, the Department of War announced that Naval Weapons Station Crane in Indiana will host the military's first advanced nuclear microreactor, with a statutory deadline to begin generating power by September 30, 2028.[1][2]

The deployment is the opening move of the Army's Janus Program, a $2.2 billion initiative designed to deploy commercial nuclear microreactors across domestic military installations. The reactors are designed to produce between 1 and 20 megawatts of electricity—enough to power a small town or a major base's critical infrastructure—and can operate for three to five years without refueling. Unlike traditional heavy-water nuclear plants, microreactors are factory-built, modular, and small enough to be transported by truck or aircraft.[1][3][4]

The military's interest is driven by a stark operational vulnerability. Current defense policy requires that critical loads on military bases remain powered for at least 14 days during an unplanned grid outage. Installations currently meet that mandate by stockpiling diesel fuel and running backup generators. However, storing and distributing millions of gallons of diesel creates a massive logistical footprint, and fuel deliveries are highly likely to fail during a prolonged regional emergency or conflict.[3]

Army Secretary Dan Driscoll framed the shift as an existential requirement for modern operations. "We are building the energy resilience necessary to project combat power globally, without relying on potentially vulnerable external grids," Driscoll said in August when the Army selected five vendors for the Janus Program. The military increasingly views the civilian power network as a primary target for adversaries, making grid-independent "island mode" operation a necessity for survivability.[4]

Naval Weapons Station Crane was selected largely because of its specific mission profile and the political willingness of the state to move quickly. The Indiana facility is a primary hub for electronic warfare, hypersonics, and microelectronics development—systems that require immense, uninterrupted power. Michael Dodd, the assistant secretary of war for critical technologies, noted that the aggressive 2028 deadline dictated the choice. "Time had priority for us... looking at site selection," Dodd told reporters. "We needed a delegation that was going to lean forward and work with us very collaboratively."[1][2]

The evidence supporting the safety of these systems relies heavily on the fuel architecture. The leading designs utilize Tri-structural Isotropic (TRISO) fuel, which encapsulates uranium in layers of carbon and ceramic. The Department of Energy and reactor developers assert that TRISO fuel cannot melt down, even if the reactor loses all coolant, because the ceramic coating withstands temperatures higher than the reactor can physically generate. This passive safety design is intended to prevent radioactive release even in the event of a kinetic impact or vehicle crash.[5]

Despite the safety claims, the evidence for the program's commercial viability remains thin. The military will not own or operate the Crane reactor; it will be commercially owned, with the Navy purchasing the power through a purchase agreement. Critics argue that early microreactor units will be vastly more expensive per kilowatt-hour than conventional power sources, and that the regulatory complexity of licensing a novel nuclear design through the Nuclear Regulatory Commission could easily breach the 2028 deadline.[1][3][4]

Fuel supply presents another severe bottleneck. Many advanced microreactor designs require High-Assay Low-Enriched Uranium (HALEU), which is enriched to between 5% and 20%. The domestic supply chain for HALEU is currently highly constrained, prompting billions in federal investment to revitalize U.S. enrichment capabilities. If the fuel supply cannot scale, the Army's vision of deploying 20 or more microreactors across the country will stall at the prototype phase.[3][5]

Waste management also remains an unresolved variable for local communities. While the Army has stated that there will be no long-term storage of radioactive waste on military installations, the exact logistics of removing and transporting spent TRISO fuel from domestic bases to federal repositories have not been finalized. The Department of War is currently negotiating agreements with the Department of Energy to handle the extraction process once the reactors reach the end of their operational cycles.[4]

If the Crane installation succeeds, it will serve as the template for a sweeping overhaul of defense infrastructure. The Army has already identified nine candidate sites for future deployments, including Fort Bragg and Fort Hood. "There is a drive to have that ability to be self-sufficient," said James Walker, CEO of NANO Nuclear Energy, which is conducting a separate feasibility study for the Air Force. The success of the Janus Program will determine whether the military can truly untether its most critical assets from the civilian grid.[3][4]