A concrete form liner that would normally take weeks to build by hand now takes days. That's what happened when researchers at the University of Maine's Advanced Structures and Composites Center got a call from Kairos Power, a nuclear startup racing to finish its first reactor in Oak Ridge, Tennessee.
Kairos was building Hermes, a 35-megawatt reactor designed to be smaller and faster to construct than traditional nuclear plants. But the walls needed precision they couldn't achieve on a normal timeline. Each section had to be exactly three feet thick, 27 feet tall, and curved in a complex sinusoidal wave — the kind of thing that makes conventional concrete casting slow, expensive, and error-prone.
So they turned to something unconventional: the world's largest polymer 3D printer. The machine at the University of Maine can extrude hundreds of pounds of material per hour, which meant the team could print custom concrete form liners — the molds that shape the actual concrete — in a fraction of the time traditional methods would require.
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Here's what made this work: the researchers designed the sinusoidal liners in digital form, printed them, then precision-machined them to meet millimeter-level tolerances. A scanning team checked every curve against the original design to catch any drift. The result was a hybrid system that cut costs, accelerated production, and kept Kairos on schedule for a project that had real deadline pressure.
"We met a commercial deadline with massive, high-precision components," said Susan MacKay, the center's chief sustainable materials officer. "This partnership demonstrates that an academic center can operate at the speed of industry."
What's happening behind the scenes matters just as much. The University of Maine is building something called a Material Process Property Warehouse — essentially a digital record of every step in the manufacturing process, powered by AI and machine learning. This "digital thread" means components can be certified as they're made, not after. For nuclear energy, where regulatory approval is a major bottleneck, that's a genuine advantage.
The partnership between a university research center, a startup, and the Department of Energy's Oak Ridge National Laboratory shows how infrastructure gets built faster when different players can actually coordinate. Kairos Power gets the precision components it needs on time. The university gets to operate at industrial scale. The DOE gets proof that the U.S. can modernize its energy infrastructure with tools that already exist — just deployed differently.
Next-generation nuclear plants are being built in several countries right now, and construction speed is one of their main selling points. This kind of manufacturing innovation could become standard as more of these projects move forward.
