Westinghouse has pushed its eVinci microreactor through a high-temperature nuclear-physics milestone that matters for one reason: the company is replacing design assumptions with measured reactor data.
In a Westinghouse Nuclear X update showing its ongoing eVinci heat-pipe testing program, the company has emphasized the hardware-validation work behind the compact reactor. The newest milestone goes further. According to Westinghouse’s September 15 announcement, eVinci reached zero-power criticality at 663°C, while researchers recorded a peak core temperature of 1,011°C during subcritical reactivity measurements.
The U.S. Department of Energy independently documented the test, which was conducted at the National Critical Experiments Research Center in Nevada with Los Alamos National Laboratory, the Nevada National Security Site and federal nuclear-safety partners.
Why 1,011°C matters
A reactor design is ultimately judged by how closely its models describe real material behavior. Westinghouse says the temperature-dependent measurements will be used to strengthen analytical models and accelerate prototype design. DOE called the 1,011°C measurement a record-high temperature for a reactivity measurement at NCERC.
That makes the test especially relevant to the broader race to turn compact nuclear systems into deployable power infrastructure. BitcoinVersus.Tech recently covered Deployable Energy’s 1 MW nuclear battery heading toward DOME testing, another example of microreactor developers moving from renderings and specifications toward physical validation.
A nuclear battery for power-hungry infrastructure
The commercial eVinci concept is designed around passive heat pipes, TRISO fuel and a graphite core, targeting up to 5 MWe of electricity with multi-year operation between refueling cycles. Those characteristics put microreactors into the same infrastructure conversation as Amazon and X-energy’s nuclear data-center strategy and the wider 33 GW U.S. data-center power shortfall projected for 2028.
The attraction is straightforward: a factory-built reactor that can provide dense, continuous power could serve remote industry, military installations, mining operations and eventually data centers without depending on weather or a massive fuel-delivery chain. But the engineering challenge is equally straightforward. Before deployment, the physics, materials, heat transfer, controls and safety case have to survive increasingly realistic testing.
The next proof point
Criticality testing does not mean a commercial eVinci unit is ready to ship. It does mean Westinghouse now has unusually high-temperature experimental data to compare against the calculations guiding the design. The next meaningful milestones will be the ones that turn those measurements into prototype performance, licensing evidence and ultimately sustained power production.
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