The drive to Kairos Power’s reactor demonstration site in Oak Ridge, Tenn., is not only scenic—it’s historic. Nearly 85 years ago, roughly 30,000 construction workers transformed orchards and farmland into a key Manhattan Project site. Depending on your route, you may pass by one of the three gatehouses that were once military checkpoints controlling access to Atomic Energy Commission production facilities.

The American Nuclear Society recently hosted a panel discussion featuring prominent figures from the nuclear sector who discussed the industry’s ongoing push for criticality.

Yasir Arafat, chief technical officer of Aalo Atomics; Jordan Bramble, CEO of Antares Nuclear; and Rita Baranwal, chief nuclear officer of Radiant Industries, participated in the discussion and covered their recent progress in the Department of Energy’s Reactor Pilot Program. Nader Satvat, director of nuclear systems design at Kairos Power, gave an update on the company’s ongoing demonstration projects taking place outside of the landscape of DOE authorization.

Kairos Power has completed shielded radiation performance testing on a full-scale precast concrete structure at the company’s Reactor Demonstration Campus in Oak Ridge, Tenn., involving the use of an iridium-192 source to measure the movement of radiation through the concrete’s walls, joints, and seams. Kairos expects the results to contribute to schedule and cost estimates for its planned commercial power plants.

A new strategic partnership is providing Kairos Power with the expertise and specialized facilities of Oak Ridge National Laboratory to help accelerate the development of the California-based company’s Hermes. This partnership is the fourth between ORNL and Kairos Power since 2020, and it is focused in part on the manufacture and management of TRISO fuel pebbles for the fluoride salt–cooled, high-temperature demonstration reactor now under construction in Oak Ridge, Tenn.

Kairos Power has finalized a contract with the Department of Energy to receive high-assay low-enriched uranium (HALEU) from the agency for the company’s Hermes low-power demonstration reactor, currently under construction in Oak Ridge, Tenn.

In partnership with Los Alamos National Laboratory, Kairos intends to use the DOE-provided material to produce HALEU TRISO fuel pebbles for Hermes. The company views the Hermes test reactor and the fuel fabrication program as crucial to the eventual success of its power-producing Hermes 2 demonstration plant, also to be sited in Oak Ridge, and future commercial fluoride salt–cooled high-temperature reactors.

Kairos Power and BWX Technologies announced today that they will work together to “collaboratively explore” optimizing commercial production of TRISO fuel for Kairos’s planned advanced reactor fleet—beginning with the 50-MWe Hermes 2, slated for operation in 2030—and other potential customers. Their collaboration could include jointly developing a TRISO fuel fabrication facility.

The Department of Energy’s Manufacturing Demonstration Facility (MDF) at Oak Ridge National Laboratory, in partnership with Kairos Power and Barnard Construction, has successfully developed and validated large-scale, 3D-printed polymer composite forms for casting complex concrete structures.

The test took place at Kairos Power’s Oak Ridge, Tenn., campus, where the Hermes Low-Power Demonstration Reactor is currently under construction.

See a video of construction activity here.

A reactor vessel has been installed by Kairos Power for its third Engineering Test Unit (ETU 3.0) at the company’s campus in Oak Ridge, Tenn.

Nuclear waste disposal technology company Deep Isolation announced it has successfully completed Project PUCK, a government-funded initiative to demonstrate the feasibility and potential commercial readiness of its Universal Canister System (UCS) to manage TRISO spent nuclear fuel.

Kairos Power announced this morning that safety-related nuclear construction has begun at the Oak Ridge, Tenn., site where the company is building its Hermes low-power test reactor. Hermes, a scaled demonstration of Kairos Power’s fluoride salt–cooled, high-temperature reactor technology, became the first non–light water reactor to receive a construction permit from the Nuclear Regulatory Commission in December 2023. The company broke ground at the site in July 2024.

Los Alamos National Laboratory recently performed a series of customized criticality experiments to obtain data that will support the transportation of HALEU TRISO fuel, the Department of Energy announced April 21.

The Department of Energy has announced its first round of conditional commitments to provide high-assay low-enriched uranium to five U.S. nuclear developers. According to the DOE, the delivery of HALEU will support the commercialization of advanced nuclear technologies, aiming to deliver secure, affordable, and reliable energy to Americans.

Texas lawmakers are considering legislative action this session on recommendations made last November by the Texas Advanced Nuclear Reactor Working Group.

Senate Bill 1105 calls for the establishment of a state-run advanced nuclear energy authority, a state permitting office, and an advanced nuclear innovation fund. Republican state Sen. Tan Parker introduced the bill.

Nuclear footprint: Texas currently has two large nuclear plants—Commanche Peak and South Texas Project—comprising four reactors that supplied nearly 10 percent of the state’s power last year.

Small modular reactors are also planned in Texas. Dow Chemical and X-energy are targeting a cluster of SMRs to support Dow’s manufacturing site in Seadrift on the Gulf Coast. At Abeline Christian University, about 200 miles west of Dallas, Natura Resources plans to install a test reactor using molten-salt cooling.

Texas A&M chancellor John Sharp has announced that the university could soon become a home to small modular reactors from four advanced nuclear companies: Kairos Power, Natura Resources, Terrestrial Energy, and Aalo Atomics.

The Department of Energy’s Gateway for Accelerated Innovation in Nuclear (GAIN) has awarded four fiscal year 2025 vouchers to support the development of advanced nuclear technologies. Each company will get access to specific capabilities and expertise in the DOE’s national laboratory complex—in this round of awards both Idaho National Laboratory and Pacific Northwest National Laboratory are named—and will be responsible for a minimum 20 percent cost share, which can be an in-kind contribution.

The Nuclear Regulatory Commission announced yesterday that it has directed staff to issue construction permits to Kairos Power for the company's proposed Hermes 2 nonpower test reactor facility to be built at the Heritage Center Industrial Park in Oak Ridge, Tenn. The permits authorize Kairos to build a facility with two 35-MWt test reactors that would use molten salt to cool the reactor cores.

Kairos Power and Google announced over the weekend a new power purchase agreement to provide the tech giant with 500 megawatts of clean energy by 2035.

Under the agreement, California-based Kairos Power will develop, construct, and operate a series of advanced reactor plants and sell energy, ancillary services, and environmental benefits to Google. Plants will be sited in “relevant service territories” to supply clean electricity to Google data centers. The first reactor is planned to be deployed by 2030 to support Google’s 24/7 carbon-free energy and net-zero goals.

Kairos Power broke ground yesterday on a Salt Production Facility at the company’s newly dedicated Manufacturing Development Campus during an event at a sprawling site in Mesa del Sol, N.M., just south of Albuquerque. The new facility will produce the FLiBe (a mixture of lithium fluoride and beryllium fluoride salts) needed to cool the advanced reactors Kairos Power plans to build, starting with its Hermes nonpower demonstration reactor in Oak Ridge, Tenn., and could be operational and producing salt in 2026, according to an October 3 Department of Energy news release.

Kairos Power accomplished another step forward for its Hermes 2 reactor plans as the Nuclear Regulatory Commission this week published its final environmental assessment and finding of no significant impact.

Earlier today, on a site in Oak Ridge, Tenn., that was formerly home to the K-33 Gaseous Diffusion Plant, Kairos Power marked the start of construction on its low-power demonstration reactor. Named Hermes, the 35-MWt test reactor claims status as the first Gen IV reactor to be approved for construction by the Nuclear Regulatory Commission and the first non–light water reactor to be permitted in the United States in more than 50 years.