Ampera claims first 3D-printed nuclear reactor module

Key Takeaways

• Ampera unveiled what it claims is the first 3D-printed nuclear reactor module, featuring a silicon carbide core and pressure vessel
• The thorium-based microreactor targets data centers with 15-30 MWe output and 30-year operation without refueling
• Nuclear module availability projected for 2030, pending regulatory approval

US startup Ampera has unveiled what it claims is the first 3D-printed nuclear reactor module, targeting data centers hungry for carbon-free baseload power. The company demonstrated a prototype featuring a fully 3D-printed silicon carbide reactor core and pressure vessel at its Palm Beach Gardens, Florida facility on July 3.

The thorium-based microreactor is designed to deliver 15 or 30 MWe depending on configuration, enough to power a typical data center, and operate for up to 30 years without refueling. Ampera expects the nuclear module to reach customers around 2030, pending regulatory approval.

How does Ampera's 3D-printed reactor work?

Ampera is building a subcritical, solid-state, thorium-based reactor. Subcritical means the fuel cannot sustain a nuclear chain reaction on its own, which prevents runaway power excursions. The solid-state design uses solid fuel rather than the liquid fuel found in some advanced reactor concepts.

The proposed fuel uses tristructural isotropic (TRISO) particles: a thorium kernel surrounded by multiple ceramic and carbon layers. Thorium-232 is not fissile on its own. After absorbing a neutron, it decays through thorium-233 and protactinium-233 into fissile uranium-233. This process requires an external neutron source, and Ampera says its design includes a proprietary "neutron driver" to start and sustain operation. The company is keeping details of this neutron generation system confidential.

The reactor core itself is described as a "spherical monolithic gyroid." A gyroid structure provides massive surface area relative to volume, making it well suited for heat transfer. This complex geometry is difficult to produce with conventional manufacturing, which is where additive manufacturing earns its keep.

Why 3D printing matters for nuclear

Traditional nuclear components require extensive machining, forging, and quality control processes that stretch timelines and inflate costs. Oak Ridge National Laboratory has demonstrated that additive manufacturing can reduce nuclear component fabrication costs by roughly 50% and cut lead times by months.

"This next-generation nuclear core and pressure vessel sets the foundation for factory-built, mass-produced nuclear energy," said Ampera founder and CEO Brian Matthews. "The advanced technology and additive manufacturing used demonstrate a clear commercial path for new nuclear technology coming to market in an accelerated manner."

If Ampera can actually deliver factory-built reactors at scale, it would represent a departure from the bespoke, years-long construction projects that have plagued the nuclear industry. The promise is appealing. The execution remains unproven.

Data centers are driving nuclear demand

Data centers consumed between 1% and 1.5% of global electricity as of 2023, and that number is climbing fast. AI training and inference workloads are particularly power-hungry. Microsoft, Google, and Amazon have all explored nuclear partnerships to meet carbon-free power commitments.

Ampera is not alone in targeting this market. Oklo, backed by Sam Altman, is developing small modular reactors with similar ambitions. NuScale has pursued utility-scale SMRs. X-energy is working on high-temperature gas reactors. TerraPower, founded by Bill Gates, is building a demonstration plant in Wyoming.

What differentiates Ampera, at least on paper, is the combination of thorium fuel, subcritical operation, and additive manufacturing. Whether these distinctions translate into commercial advantages depends on factors the company has not yet demonstrated publicly.

Timeline and regulatory hurdles

Ampera told The Register it expects the power generation portion of the system to be available as early as 2027, with the nuclear module reaching customers around 2030 based on regulatory approval. That timeline is ambitious. The Nuclear Regulatory Commission has never licensed a thorium-fueled reactor in the United States, and novel designs face extensive review.

In June, Ampera announced an Australian subsidiary to secure thorium supplies and said it plans to produce TRISO thorium fuel kernels domestically. "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," Matthews said.

Defense applications may provide a faster path to deployment. The US Department of the Air Force announced earlier this year that it is evaluating microreactors for three sites as part of an energy resilience program. Military projects can sometimes move through regulatory channels more quickly than commercial ones.

What remains unproven

Ampera has demonstrated a prototype. It has not demonstrated a working reactor. The company has not disclosed how its neutron driver generates the neutrons needed to convert thorium into fissile material. It has not revealed pricing. It has not announced any customer commitments.

The nuclear industry has seen ambitious startups before. Many have struggled with regulatory delays, cost overruns, and technical challenges that looked manageable on paper but proved stubborn in practice. Ampera's claims about 30-year operation without refueling and factory-scale production are attractive. They are also unverified.

Frequently Asked Questions

What is a 3D-printed nuclear reactor?

A nuclear reactor with key components, such as the core and pressure vessel, manufactured using additive manufacturing (3D printing) rather than traditional forging and machining. This approach can reduce fabrication time and costs while enabling complex geometries difficult to produce conventionally.

Why use thorium instead of uranium?

Thorium is more abundant than uranium, produces less long-lived radioactive waste, and in subcritical designs cannot sustain a runaway chain reaction. However, thorium-232 must be converted to fissile uranium-233 through neutron absorption, requiring an external neutron source.

Can microreactors really power data centers?

A 30 MWe reactor could power a small to mid-sized data center. Large hyperscale facilities may require multiple units or higher-output configurations. Several companies including Oklo, NuScale, and X-energy are targeting this market alongside Ampera.

When will Ampera's reactor be available?

Ampera expects the nuclear module to be available around 2030, contingent on regulatory approval from the Nuclear Regulatory Commission. The power generation portion of the system may be available as early as 2027.

Source: www.theregister.com