Startup Ampera has [1]unveiled what it calls the [2]first 3D-printed nuclear reactor module , built around a silicon-carbide core and pressure vessel designed for a thorium-based microreactor. The company says future systems could deliver 15 or 30 megawatts for up to 30 years without refueling. When The Register asked about availability, their spokesperson said: "We expect the power generation portion of the system to be available as early as 2027, with the nuclear module being available to customers about 2030 based on regulatory approval." From the report:

> Founder and CEO Brian Matthews revealed the prototype microreactor, which features a fully 3D-printed silicon carbide reactor core and pressure vessel. "This next-generation nuclear core and pressure vessel sets the foundation for factory-built, mass-produced nuclear energy," Matthews said. "The advanced technology and additive manufacturing used demonstrate a clear commercial path for new nuclear technology coming to market in an accelerated manner." His company is developing a subcritical, solid-state, factory-built thorium-based nuclear reactor. Subcritical means the fuel cannot sustain a nuclear chain reaction on its own, which prevents a runaway power excursion.

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> Ampera uses "solid-state" to describe a design with solid rather than liquid fuel. The proposed fuel uses tristructural isotropic, or [3]TRISO , particles, consisting of a fuel kernel containing thorium, surrounded by multiple ceramic and carbon layers. [...] "Thorium is the future for ultra-safe, clean power production," Matthews said at the time. "By producing TRISO thorium kernels in the United States, we can ensure ample access to the needed fuel supply as we scale up and also minimize price volatility risk."

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> Ampera also describes the heart of the reactor as as a spherical monolithic gyroid core. A gyroid, as far as we can fathom, is a complex shape that provides a massive surface area relative to its volume, making it well-suited for heat transfer. Its complexity makes it difficult to produce using conventional manufacturing methods, which is where additive manufacturing comes in. The core is 3D-printed using silicon carbide and designed to operate for up to 30 years without refueling, the firm claims. Ampera says its planned systems will provide 15 or 30 MWe, depending on the configuration, enough to supply a typical datacenter. Larger configurations are planned. Matthews said that his company expects to be the first to industrialize factory-built nuclear power with near-term deployment timelines.



[1] https://www.prnewswire.com/news-releases/ampera-marks-major-nuclear-milestone-863473352.html

[2] https://www.theregister.com/systems/2026/07/03/startup-targets-datacenters-with-3d-printed-nuclear-reactor-module/5266480

[3] https://www.energy.gov/ne/articles/triso-particles-most-robust-nuclear-fuel-earth