A California nuclear technology company has used a next-generation reactor prototype to supply electricity to an artificial intelligence chip for the first time in the United States. During a demonstration at an Emery County facility, Valar Atomics routed a small amount of electrical current from its Ward 250 reactor to an Nvidia Blackwell processor. The energy was temporarily utilized to operate a web server.
“Valar Atomics became the first nuclear startup to make electricity, and we did it by powering an NVIDIA Spark,” said the company in a media release.
Alongside the equipment demonstration, Valar Atomics and Nvidia formalized a collaborative agreement to study configurations for nuclear-supported computing installations. The entities intend to design a 30-megawatt computing facility that runs entirely independently of local municipal water supplies.
Data center operators face escalating electricity requirements to support heavy computational workloads. Standard data facility cooling mechanisms evaporate significant quantities of water, which strains local infrastructure.
The proposed facility intends to eliminate this environmental footprint by matching a water-free reactor design with a specialized closed-loop fluid cooling system built by Nvidia.
Ward Zero for validation
The electrical demonstration followed a preliminary testing phase completed last month, during which the Ward 250 unit achieved its initial controlled nuclear chain reaction. Before introducing nuclear fuel to the primary unit, engineering teams used a non-nuclear mock-up named Ward Zero to validate the equipment.
By installing silicon carbide heating units within the core of the non-nuclear system, technicians simulated peak operating temperatures to verify that all structural components functioned properly under thermal stress.
The underlying design utilizes a High-Temperature Gas-Cooled Reactor framework that Valar Atomics refers to as its Numenor architecture. The layout uses low-enriched uranium embedded within specialized TRISO-coated particles, utilizing helium gas as the primary thermal transport medium.
Altering the safety profile
This specific combination alters the safety profile of the facility. The physical properties of TRISO fuel and gas cooling allow the core to dissipate residual decay heat naturally.
The mechanism prevents core degradation during severe operational failures without requiring electrical backup systems, water pumps, or automated mechanical overrides. The structural composition of low-enriched TRISO particles makes the fuel difficult to process for military applications, reducing proliferation risks.
Because gas-cooled systems function at elevated operational temperatures, they generate high-grade thermal energy alongside electricity. This thermal output can be diverted directly to adjacent manufacturing plants, providing an integrated energy source for chemical processing and industrial manufacturing.
Though the test established a technical baseline, advanced nuclear technology remains far from widespread commercial deployment. The domestic industry consists primarily of early-stage experimental projects, and federal regulators have not yet certified any next-generation advanced reactors for standard commercial sale in the United States.
To address the economic barriers associated with traditional nuclear construction, Valar Atomics plans to structure its architecture for factory mass production. The manufacturing strategy focuses on fabricating units in small, modular sizes.