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    "headline": "Texas campus reactor in a 1,000-ton steel vault clears its final DOE safety review before startup",
    "description": "The approval for Last Energy's 5-megawatt PWR-5 at Texas A&M-RELLIS came from the Energy Department, not the NRC; a readiness review is the last step before fuel and criticality.",
    "datePublished": "2026-10-15T04:45:00+01:00",
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    "keywords": "Department of Energy, Last Energy, microreactors, nuclear energy, Texas A&M",
    "articleBody": "The US Department of Energy has approved the final safety analysis for Last Energy’s PWR-5, a pilot reactor at the Texas A&M-RELLIS research campus in Bryan, Texas. The company announced the approval on October 7, 2026. One more DOE step, a readiness review, stands between the plant and permission to load fuel, reach criticality (the point where the nuclear chain reaction keeps itself going) and run. The sign-off comes from the Energy Department, not the Nuclear Regulatory Commission, the agency that licenses commercial power plants. That distinction shapes what this reactor is and is not allowed to be. What the DOE actually signed The document is called a Documented Safety Analysis, or DSA. Last Energy describes it as the last and most detailed safety case in the DOE authorization process, setting out how the reactor and the building around it will be run safely. It follows a Preliminary Documented Safety Analysis that the department approved in May 2026. The route exists because of the DOE Reactor Pilot Program, set up under Executive Order 14301 in 2025 to let test reactors be authorized through the department rather than the commission. Its stated goal was to get at least three advanced designs critical outside the national laboratories by July 4, 2026. Last Energy was picked for the program in August 2025. Licensing of commercial plants stays with the NRC. A 20-megawatt core run at a quarter of the power The PWR-5 is a small pressurized water reactor, built on long-established reactor technology and off-the-shelf low-enriched uranium fuel rather than an exotic new design. Its trick is that it uses the same physical core geometry as the company’s commercial product, the PWR-20, but with fuel of lower enrichment, sized for 5 megawatts of electricity. For the PWR-20, the company’s published figures are 20 megawatts electric from 80 megawatts of heat, using standard full-length fuel enriched to 4.95% uranium-235 and air cooling instead of a river or lake. Run the numbers and the pilot’s purpose is clearer. Five megawatts is 25% of the commercial unit’s electrical rating. And because 20 electric megawatts come from 80 thermal, the design turns roughly one unit of heat in four into electricity. A pilot that proves the full-size core at a quarter of the output lets the company test the hardware buyers would actually get, without first fueling a full commercial plant. The headline figure about a 1,000-ton steel vault refers to the company’s integrated containment: a hermetically sealed steel structure of about 1,000 tons that encloses the primary systems and is designed for factory fabrication and operation with no human access inside. The pilot building at RELLIS is already standing, and the company said in May that its fuel had been manufactured. The timeline so far August 2025: selected for the DOE Reactor Pilot Program. October 15, 2025: Last Energy and the Texas A&M University System announce the RELLIS pilot. May 2026: DOE approves the preliminary safety analysis; construction is nearing completion. October 7, 2026: DOE approves the final Documented Safety Analysis. Next: DOE readiness review, then startup authorization for fuel, criticality and operation. “PDSA approval is a major step in moving the PWR-5 from construction into operations,” Adam Lenarz, Last Energy’s vice president of development, said in May, adding that the team had pushed construction, procurement, fuel fabrication and paperwork forward in parallel. What it means for buyers of power Last Energy is not first through this door. The department reported on August 6, 2026 that Oklo’s Groves isotope test reactor in Lockhart, Texas, had become the fifth DOE-authorized advanced reactor to go critical that summer, after Antares Nuclear, Valar Atomics, Deployable Energy and Aalo Atomics. A DOE-authorized demonstration is still not a commercial license. The PWR-20 units the company wants to sell to data centers and factories would still need regulatory approval to operate as power plants: from the NRC in the US, and in Britain from the Office for Nuclear Regulation, which admitted a planned four-unit site at Llynfi in South Wales into licensing in February 2025. For a customer, the useful proof is narrower than the approval suggests: whether a full-size Last Energy core reaches criticality on schedule and then generates power at 5 megawatts. The readiness review is the next gate, and the department has not published a date for it. Further reading US Department of Energy: Reactor Pilot Program US Department of Energy: Office of Nuclear Energy celebrates fifth advanced reactor criticality Wikipedia: Last Energy Image: NRCgov (US Nuclear Regulatory Commission), Public domain via Wikimedia Commons This article was produced with AI assistance and reviewed by our Editorial Desk. How we work.",
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