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China Becomes First to Achieve Operation of a Thorium-229 Nuclear Optical Clock, Bringing Quantum Precision Measurement into the Atomic Nucleus Scale

Recently, the team of Ding Shiqian, associate professor in the Department of Physics at Tsinghua University, published important results online in the international academic journal Nature, announcing the successful development of a thorium-229 nuclear optical clock and the achievement of its stable operation. This work was completed independently in the same period as that of a European team, making China the first internationally to achieve operation of a thorium-229 nuclear optical clock, marking the successful extension of the time measurement standard from electronic transitions to nuclear transitions. It is understood that a nuclear optical clock uses the internal transition of the thorium-229 atomic nucleus as a time-frequency reference. Ding Shiqian, one of the corresponding authors of the paper, introduced that the pendulum of an old-fashioned wall clock swings about once per second, whereas a nuclear optical clock uses the beat of the atomic nucleus as its "pendulum," with a beat frequency of up to about 2 quadrillion times per second. Because the size of the atomic nucleus is only a few tens of thousandths of the electron cloud outside the nucleus...

2026-10-08

General Matter Submits HALEU License Application to U.S. NRC

Paducah, Kentucky, USA — General Matter submitted a license application to the U.S. Nuclear Regulatory Commission (NRC) on September 28, 2026, for the construction and operation of a nuclear facility. The project aims to produce High-Assay Low-Enriched Uranium (HALEU) to meet the growing domestic demand for advanced nuclear reactor fuel in the United States. General Matter plans to build a dedicated HALEU production...

2026-09-29

Centrus Energy to Supply HALEU Fuel to Antares Nuclear, Enabling Micro Nuclear Reactor Applications for Military and Space

U.S. nuclear fuel supplier Centrus Energy has signed a multi-year contract with advanced microreactor developer Antares Nuclear, under which Centrus will supply high-assay low-enriched uranium (HALEU) to Antares. This agreement is expected to expand the application scenarios of micro nuclear reactors to locations where traditional power sources are difficult to use, such as military facilities and space environments. As part of the agreement, Antares Nuclear will make advance payments to support Centrus in expanding HALEU production capacity in the United States. Compared with conventional low-enriched uranium, HALEU contains more uranium-235, with an enrichment level above 5% but below 20%. This new type of fuel can support smaller, higher-energy-density reac...

2026-09-18

US Centrus and Radiant Sign Long-Term HALEU Supply Agreement

On September 9, 2026, US nuclear fuel and services supplier Centrus Energy Corp. (Centrus) and mobile nuclear microreactor developer Radiant announced that the two parties have signed a multi-year definitive contract. Under the agreement, Centrus will supply high-assay low-enriched uranium (HALEU) fuel for Radiant's Kaleidos microreactor to support the deployment of multiple reactors. The agreement stipulates that Centrus will begin delivering HALEU by the end of this decade. The arrangement will add a domestic US fuel source for Radiant as it advances the commercial expansion of the Kaleidos reactor, and will also add a new HALEU customer for Centrus. The agreement also includes Ra...

2026-09-10

U.S. NANO Nuclear and Enveniam to Advance Microreactor and Nuclear Fuel Cycle Cooperation

U.S. advanced nuclear energy company NANO Nuclear Energy Inc. announced on September 4 that it has signed a non-binding memorandum of understanding with Enveniam, LLC, a project integration and engineering technology services provider, to explore cooperation in areas such as nuclear fuel cycle infrastructure, microreactor commercialization, advanced manufacturing, and end-user energy solutions. Under the MOU, the parties will evaluate how to leverage Enveniam's experience in nuclear engineering, project integration, safety analysis, licensing support, project controls, operational readiness, and complex energy infrastructure development to support NANO Nuclear...

2026-09-05

U.S. Completes Mechanical Property Measurements of Irradiated HALEU TRISO Fuel Particles

Researchers at the U.S. Department of Energy's Oak Ridge National Laboratory (ORNL) have completed mechanical property measurements of irradiated high-assay low-enriched uranium (HALEU) TRISO fuel particles, providing new experimental data for the development and qualification of next-generation nuclear fuels. This is an optical cross-sectional image of an irradiated AGR-2 TRISO fuel particle in the Irradiated Fuels Examination Laboratory at Oak Ridge National Laboratory. Image credit: Oak Ridge National Laboratory, U.S. Department of Energy. TRISO fuel, or tri-structural isotropic fuel, features particles coated with multiple protective layers, typically including pyrolytic carbon layers and a silicon carbide layer. This structure provides strong fission product retention capability and is considered one of the key fuel options for advanced reactors, particularly high-temperature gas-cooled reactors. Understanding the property changes of these coatings after irradiation is a critical step in predicting fuel performance under reactor operating conditions.

2026-09-04

Expansion Project Advances at Centrus Energy's Uranium Enrichment Facility in Piketon, Ohio

Centrus Energy said on August 24 that Ohio Governor Mike DeWine, Lieutenant Governor Jim Tressel, JobsOhio CEO J.P. Nauseef, along with state, federal, and local stakeholders, visited the company's uranium enrichment facility in Piketon, Ohio, to discuss the development of the U.S. domestic nuclear fuel supply chain and Ohio's role in it. In September 2025, Centrus Energy announced a multi-billion-dollar expansion of the Piketon uranium enrichment plant. Currently, the expansion...

2026-08-25

CERN Large Hadron Collider Data Challenge Models of Oxygen and Neon Nucleus Structure

Physicists at the European Organization for Nuclear Research (CERN), analyzing a new batch of collision data from the CMS detector at the Large Hadron Collider, have found that oxygen and neon nuclei do not behave entirely as predicted by existing models in high-energy collisions. This result indicates that the scientific community's understanding of the shapes and internal structures of certain light nuclei still requires further refinement. In high-energy nuclear collisions, a quark-gluon plasma is briefly formed in the collision region. This state of matter decays rapidly, but the collective flow characteristics of its particles can be used to infer the collision geometry and indirectly provide information about nuclear structure. Researchers believe that symmetric collisions of light ions help better control the initial collision conditions, making them suitable for studying collective responses in small systems.

2026-08-24

Large Hadron Collider experiments reveal neon nucleus may be bowling-pin shaped

A recent experimental result from the Large Hadron Collider at CERN suggests that the internal structure of the neon-20 nucleus may not be approximately spherical as commonly depicted in traditional textbooks, but rather closer to a "bowling pin" shape. This finding provides new experimental clues for studying deformation of light atomic nuclei and collective behavior in high-energy nuclear collisions. Atomic nuclei are composed of protons and neutrons, determining the elemental identity of atoms and carrying most of their mass. Although nuclei are often simplistically depicted as spherical, nuclear physics research has shown that some nuclei exhibit pronounced non-spherical deformation, such as the pear-shaped nuclei mentioned in previous studies. Accurately understanding these shapes helps physicists...

2026-08-21

NANO Nuclear and QNI Sign Memorandum of Understanding to Advance Domestic HALEU Fuel Supply Cooperation in the U.S.

NANO Nuclear Energy Inc. (NANO Nuclear) and Quadrant Nuclear Industries, Inc. (QNI) announced on August 18 that the two companies have signed a memorandum of understanding (MOU) establishing a non-binding framework for future high-assay low-enriched uranium (HALEU) fuel supply cooperation. Under the MOU, the parties will engage in discussions regarding the supply of HALEU to be produced by QNI in the future and long-term offtake arrangements. The fuel in question is planned to come from QNI's proposed Vanguard facility at Idaho National Laboratory (INL). QNI stated that once the facility operates at full capacity, its annual HALEU production...

2026-08-19

First American Nuclear Company's Regulatory Engagement Plan for Proposed HALEU Fuel Facility Accepted for Docketing by NRC

First American Nuclear Co. (FANCO) announced on August 17 that its regulatory engagement plan for the proposed Class II high-assay low-enriched uranium (HALEU) conversion and fuel fabrication facility has been accepted for docketing by the U.S. Nuclear Regulatory Commission (NRC). The facility will serve the company's EAGL-1 small modular reactor project currently under development. According to the company's disclosure, the NRC ADAMS accession number for the letter of intent is ML26222A181, and the NRC ADAMS accession number for the regulatory engagement plan is ML26222A177. This submission advances the pre-application regulatory engagement between FANCO and the NRC regarding the proposed ceramic fuel fabrication facility. The facility is planned to support the EAGL-1 lead-bismuth...

2026-08-18

CMS completes high-pileup collision test, validating particle reconstruction algorithms for High-Luminosity LHC operation

In 2025, the Large Hadron Collider (LHC) conducted a dedicated test over several days to simulate high-intensity collision conditions closer to those expected during future operation of the High-Luminosity Large Hadron Collider (HL-LHC). The Compact Muon Solenoid (CMS) experiment team used this opportunity to test whether existing particle tracking, identification, and reconstruction software, along with a new class of machine learning methods, can adapt to the more complex collision conditions of the HL-LHC era. During LHC operation, each crossing of proton beams produces multiple proton–proton collisions simultaneously, a phenomenon known as pileup. The current Run 3 features approximately 65 simultaneous interactions, while the HL-LHC is expected to reach 140 to 200. To...

2026-08-10

X-Energy and Centrus Sign HALEU Supply Agreement, Accelerating U.S. Advanced Nuclear Fuel Supply Chain

X-Energy and Centrus Energy have signed a low-enriched uranium and high-assay low-enriched uranium supply agreement, marking a more concrete commercialization phase in fuel assurance for U.S. advanced nuclear reactors. Under the agreement, Centrus will provide uranium enrichment services at its American Centrifuge Plant in Pike County, Ohio, with the HALEU to be supplied to X-Energy's fuel subsidiary TRISO-X for the production of TRISO-coated particle fuel at its Oak Ridge, Tennessee fuel fabrication facility, serving the Xe-100 high-temperature gas-cooled small modular reactor. The significance of this agreement lies not only in the supply itself but also in its phased advance payment arrangement. X-Energy will support Centrus through advance payments...

2026-08-07

The U.S. Department of Energy conditionally allocates HALEU fuel to NASA and Radiant.

On July 23, the U.S. Department of Energy (DOE) announced a conditional commitment to provide High-Assay Low-Enriched Uranium (HALEU) to NASA and Radiant Industries to meet near-term fuel needs. This marks the third round of HALEU allocations; the materia

2026-07-27

The U.S. Department of Energy conditionally allocates HALEU fuel to NASA and Radiant.

On July 23, the U.S. Department of Energy (DOE) announced a conditional commitment to provide High-Assay Low-Enriched Uranium (HALEU) to NASA and Radiant Industries to meet near-term fuel needs. This marks the third round of HALEU allocations; the materia

2026-07-27