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Oklo's Groves Isotope Test Reactor Achieves First Criticality, Fifth Reactor in U.S. Department of Energy Test Reactor Program Successfully Started

The Groves Isotope Test Reactor under Oklo, an advanced nuclear fission company in the United States, has officially achieved first criticality. The U.S. Department of Energy (DOE) confirmed that the reactor successfully reached criticality at 9:19 p.m. Eastern Time on Wednesday at the Groves site in Lockhart, Texas, becoming the fifth advanced test reactor to achieve criticality under the DOE's dedicated authorization and regulatory pathway. The Groves Isotope Test Reactor has a thermal power of 15 megawatts (MWt) and adopts an atmospheric-pressure water-cooled pool-type reactor design. It is led by Oklo Isotopes, a subsidiary of Oklo focused on medical and industrial isotope production...

2026-10-11

French Nuclear Safety and Radiation Protection Authority Approves Exemption of ITER Vacuum Vessel from Fission Pressurized Equipment Regulation

The French Nuclear Safety and Radiation Protection Authority (ASNR) has formally issued a regulatory ruling, approving the application by the International Thermonuclear Experimental Reactor (ITER) Organization to exclude the Vacuum Vessel, a core component of the ITER tokamak device, from the scope of regulation under the French and European Nuclear Pressure Equipment Directive (ESPN). This breakthrough ruling marks the beginning of key fusion reactor components breaking free from the regulatory framework derived from traditional fission reactors. Prior to this decision, the ITER Vacuum Vessel had long been classified as nuclear pressure equipment. This classification originated from the management practices of traditional light-water fission reactors, whose underlying logic presumes internal pressure as the primary engineering load on the structure. However...

2026-10-11

3-meter-wide hole found at bottom of Unit 3 reactor pressure vessel at Fukushima Daiichi Nuclear Power Station: molten nuclear fuel burned through the base plate, TEPCO advances evaluation of debris removal project

The latest investigation data released by Tokyo Electric Power Company (TEPCO) shows that an irregular circular hole with a maximum diameter of 3 meters exists at the bottom of the reactor pressure vessel (RPV) of Unit 3 at the Fukushima Daiichi Nuclear Power Station (Fukushima No. 1 NPP). This is the first time since the March 11, 2011 Great East Japan Earthquake triggered a tsunami and caused core meltdown that TEPCO has determined the specific shape and dimensions of the damaged bottom of the pressure vessel among the three reactors that experienced meltdown. The conclusion is based on image data obtained by a technical team in March this year using palm-sized micro-drones to conduct 21 flight surveys inside the containment vessel of Unit 3. Based on the multi-angle...

2026-10-11

US MARVEL Microreactor Approved for Criticality Testing, Testing Expected to Begin by End of 2026

The U.S. Department of Energy (DOE) Idaho Operations Office has formally approved the final safety analysis report for the MARVEL microreactor at Idaho National Laboratory (INL). This key regulatory approval authorizes the reactor to proceed with configuration preparations for dry criticality testing, marking a breakthrough for the project following the approval of the preliminary safety analysis report in March of this year. The MARVEL (Microreactor Applications Research Validation and Evaluation) project is a sodium-potassium alloy-cooled microreactor test platform with a design thermal power of 85 to 100 kilowatts and a net electrical power of approximately 20 kilowatts. The facility is designed to help private companies such as Amazon Web Services (AWS) and GE Vernova test micro...

2026-10-10

US-based NuCube Launches High-Temperature Testing of 250 kW Pump-Free Microreactor in Utah

Advanced nuclear developer NuCube Energy is conducting a new round of non-nuclear testing in Utah, USA, on its factory-assembled microreactor technology. The company is collaborating with researchers from Brigham Young University to advance the project at the San Rafael Energy Research Laboratory. The partners are using electric heating technology to precisely simulate the operating conditions inside their planned NuSun micro fission system. The core focus of this round of testing is to verify whether small modular nuclear energy can provide clean, decarbonized energy support for high-energy-consumption manufacturing operations. Conventional commercial nuclear power plants typically rely on mechanical pumps and large pools to manage core temperature. Once mechanical components fail or...

2026-10-10

Romania's Cernavoda Nuclear Power Plant Reactors to Remain Shut Down Until at Least October 15

Cristian Bușoi, State Secretary of Romania's Ministry of Energy, stated to the media through public channels that Romania is experiencing its most difficult energy situation in recent decades. The low flow of the Danube River and low water levels near Cernavoda have severely affected the nuclear power plant. Currently, both reactors remain shut down, and the Danube's flow is expected to reach a historic low within the next ten days. At least until October 15, Units 1 and 2 of Cernavoda cannot be restarted. The extreme low water level of the Danube has not only caused an interruption in nuclear baseload power supply but has also simultaneously impacted the hydroelectric power output of the country's hydropower stations. Romani...

2026-10-08

When the Water Runs Dry, the Reactors Stop: Behind Romania Losing One-Fifth of Its Electricity, Heavy-Industry Reactor Designs Are Suffering a Fatal "Cold Source Asphyxiation" — Examining the Physical Interrogation of High-Water-Consumption Baseload Plants by Extreme Drought Through the Prolonged Paralysis of the Cernavodă Nuclear Power Plant

For a long time, nuclear power has been regarded as the unwavering backbone of round-the-clock baseload electricity, immune to weather conditions, cloud cover, or lulls in wind. However, the nearly two-month total shutdown of Romania's Cernavodă Nuclear Power Plant is breaking this industry paradigm in an extreme and brutal manner. Because the Danube River has experienced a historically rare drought exceeding warning thresholds and a cliff-edge collapse in water levels, the country's only nuclear power plant—which safeguards one-fifth of its electricity supply—has been paralyzed by the loss of cooling water assurance, with no prospect of near-term restart. This extreme case not only tears open a massive gap in winter energy security for Romania and even Southeastern Europe, but also sounds an alarm for the global energy community: in the face of increasingly...

2026-10-08

NASA and U.S. Department of Energy Sign Memorandum of Understanding: Opening a New Era in Space Nuclear Energy Exploration

According to reports, the National Aeronautics and Space Administration (NASA) and the U.S. Department of Energy (DOE) signed a Memorandum of Understanding (MoU) on October 8, 2026, at the Golden Age Summit held at the Donald J. Trump Institute for Peace in Washington, D.C., to advance new nuclear technologies for space exploration. NASA Administrator Jared Isaacman and Energy Secretary Chris Wright attended the signing ceremony. It is understood that the memorandum aims to strengthen the two agencies' cooperation in nuclear technology development...

2026-10-09

Construction Management Practice of Unbonded Prestressed Tendons in the Containment of the Reactor Building

As a landmark project of China-Russia nuclear energy cooperation, Units 7 and 8 of Tianwan Nuclear Power Plant were the first in China to apply unbonded prestressing technology to the inner containment of the reactor building. There was no domestic construction experience with unbonded prestressing in containments to draw upon, and the installation of large-diameter prestressing ducts, as well as the strand threading, grouting, and tensioning of greased and sheathed strands, presented considerable difficulty, exposing construction to significant risks and challenges. As a "first-of-a-kind new process," to complete this pioneering project to high quality and high standards, China Nuclear Power Engineering Co., Ltd., as the general contractor, worked in close coordination and collaboration with all participating units to carry out innovative work, guided by strategy, driven by technology...

2026-10-09

Large-Scale Nuclear Emergency Exercise Held at Russia's Beloyarsk NPP: Simulating Response to Concurrent Dual-Reactor Accident

The Beloyarsk NPP in Russia's Sverdlovsk Region launched a two-day comprehensive nuclear emergency exercise on October 6, 2026. The exercise is based on a hypothetical scenario of a natural disaster compounded by a reactor safety system failure, with a focus on emergency response and cross-departmental coordinated handling capabilities when two nuclear reactors experience severe accidents simultaneously. The exercise is being conducted simultaneously at the Beloyarsk NPP site and the neighboring city of Zarechny, and is the largest annual comprehensive nuclear emergency drill in the Russian nuclear industry system and the Ural Federal District. Beloy...

2026-10-08

Hinkley Point B Nuclear Power Station Formally Handed Over to Nuclear Restoration Services: Becomes England's First Advanced Gas-Cooled Reactor Transferred by EDF for Decommissioning

On 1 October 2026, the UK Office for Nuclear Regulation (ONR) formally approved the transfer of the nuclear site licence, and Hinkley Point B Nuclear Power Station was officially handed over from Électricité de France (EDF) to Nuclear Restoration Services (NRS), a subsidiary of the UK government. This marks Hinkley Point B as the first Advanced Gas-Cooled Reactor (AGR) nuclear power station in England to formally enter the national specialist decommissioning sequence, and the second AGR unit in the UK to complete such a transfer, following Hunterston B Nuclear Power Station in Scotland earlier this year. Hinkley Point B Nuclear Power Station is located in Somerset and was built between 196...

2026-10-08

South Korea's HD Hyundai Deepens Marine SMR Layout: Joint Industry-University-Research Initiative Establishes Demonstration Center to Accelerate Commercialization Validation of Marine SMRs

South Korean shipbuilding giant HD Hyundai is comprehensively accelerating the commercialization process of Small Modular Reactors (SMRs). The company recently joined hands with South Korea's nuclear energy industry, academia, and authoritative classification societies to sign a multi-party cooperation agreement, announcing the formal establishment of the SMR Marine Technology Demonstration Center, aimed at deeply integrating the construction capabilities of shipbuilding engineering with the cutting-edge research strengths of the nuclear industry and universities, creating a core catalyst for the commercial deployment of marine nuclear power. The demonstration center brings together a total of 12 industry-university-research units, including the Korean Register (KR), key nuclear energy institutions, and multiple major South Korean universities....

2026-10-08

Rosatom Completes Installation of Two Moisture Separator Reheaters for the Conventional Island of the BREST-OD-300 Lead-Cooled Fast Reactor

Rosatom announced on October 7, 2026 that at the construction site of the innovative BREST-OD-300 nuclear power unit in Seversk, Tomsk Oblast, a key milestone breakthrough has been achieved in the installation of core main equipment in the conventional island (turbine island) building, with two large moisture separator reheaters (MSR) successfully hoisted into their design-basis positions. The two moisture separator reheaters installed this time are core large heat exchange equipment of the conventional island of a dual-loop nuclear power plant, each with a height of 16 meters and a net weight of 95 tons. The core function of this equipment is to...

2026-10-08

Blue Energy becomes the first small nuclear power developer to apply for grid connection in Texas, aiming to provide baseload power for AI data centers

According to local U.S. media reports, nuclear energy startup Blue Energy Global Inc. has formally submitted a grid connection application to the Texas grid operator, becoming the first developer in the United States to apply to connect next-generation small modular reactor (SMR) power to the Texas main grid (ERCOT). The move is aimed at addressing the explosive growth in baseload electricity demand in Texas driven by the construction of artificial intelligence (AI) and supercomputing data centers. According to the relevant project plans submitted by Blue Energy, the company is advancing the development of a large energy complex in partnership with data center operator Crusoe Inc. The hybrid energy base is initially planned to first rely on natural gas units for rapid commissioning and power generation to address the urgent short-term power shortage of computing clusters; subsequently, small nuclear reactors will be gradually added and deployed to comprehensively build a long-term stable energy supply architecture featuring "gas-nuclear synergy and carbon-free transition."

2026-10-07

US-based Valar Atomics Plans to Deploy 456 Gas-Cooled Nuclear Reactors in Utah: Building a Dedicated 9.6 GW Power Supply System for a Supercomputing Data Center

US energy startup Valar Atomics has officially submitted a proposal for the construction of an ultra-large-scale industrial park named Project Beehive. The project is planned to be sited on federal and state land near Price, Utah, covering an area of approximately 9,000 acres. The entire project plans to deploy 456 small gas-cooled nuclear reactors in a clustered configuration, with an expected total installed generating capacity reaching an astonishing 9.6 gigawatts (GW). This scale is more than twice Utah's current average grid-wide generation load of 4 GW and approaches its summer peak demand of nearly 10 GW. This ultra-dense...

2026-10-03