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Unit 3 of Finland's Olkiluoto Nuclear Power Plant automatically disconnected from the grid due to a technical fault

On September 10, several hours before the start of a planned shutdown for maintenance, Unit 3 of Finland's Olkiluoto Nuclear Power Plant automatically disconnected from the grid due to a technical fault detected in the steam generator. The plant operator, Teollisuuden Voima Oyj (TVO), said that at the time of the incident, Unit 3 was gradually reducing power as planned and was already operating at extremely low power. The automatic disconnection occurred earlier than the originally scheduled grid disconnection for maintenance. TVO stated that all plant systems were operating normally and that the event had no impact on nuclear safety. The Olkiluoto Nuclear Power Plant is located on the Olkiluoto Peninsula along the coast of the Gulf of Bothnia in the Baltic Sea in Finland. The plant has three operating units, of which Unit 3...

2026-09-11

Yanchaojuneng Completes VPI of Stainless Steel-Jacketed Superconducting Prototype Coil for Stellarator

Recently, Yanchaojuneng (Shanghai) Technology Co., Ltd. completed vacuum pressure impregnation (VPI) of a next-generation stellarator stainless steel-jacketed three-dimensional shaped superconducting prototype coil. Previously, the prototype coil had completed two core processes: three-dimensional precision winding and ground insulation wrapping. The completion of VPI signifies that the company has established an autonomous process chain from coil winding and forming, insulation wrapping, to integrated insulation curing. The stellarator is an important device type for steady-state operation in the field of controlled nuclear fusion, capable of reducing the risk of major plasma disruptions. Three-dimensional shaped superconducting coils are the core components for building the magnetic field that confines plasma in a stellarator. Public information shows that Germany's W7-X stellarator uses aluminum alloy jackets...

2026-09-10

Finland's Loviisa Nuclear Power Plant Signs 22-Year Power Purchase Agreement with Google

On September 9, 2026, Google announced that it will invest at least 13 billion euros in Finland over the next two years for artificial intelligence infrastructure construction. The investment includes building and expanding data centers in Finland, along with supporting energy projects. Among them, Google signed a 22-year power purchase agreement with Finnish energy company Fortum to purchase up to 50% of the electricity generated by the Loviisa Nuclear Power Plant. Google President and Chief Investment Officer Ruth Porat stated that this arrangement is Google's first nuclear energy deal outside the United States. Google said this investment is its largest single investment in Europe, and the related infrastructure will support services including Gemini, Search, Maps, and YouTube. Lovi...

2026-09-10

US Lightbridge Aims to Accelerate Advanced Nuclear Fuel Commercialization via INL Project

Lightbridge Corporation, a US advanced nuclear fuel technology company, announced on September 8 that it has been selected for the "Launchpad" program advanced by the US Department of Energy (DOE) at Idaho National Laboratory (INL), and plans to leverage this opportunity to accelerate the deployment of Lightbridge Fuel™ in commercial reactors. According to a shareholder letter from Lightbridge Chairman and CEO Seth Grae, the company will pursue a two-track commercialization strategy: on one track, under DOE authorization, it will build the Specialized High-Assay Low-Enriched Uranium Extrusion Demonstration (SHED) facility to produce Lead Test Assemblies (LTAs); on the other...

2026-09-09

IAEA Completes Review of Finland's Nuclear and Radiological Emergency Preparedness

An International Atomic Energy Agency (IAEA) expert team recently concluded a review of Finland's nuclear and radiological emergency preparedness and response framework. The Emergency Preparedness Review (EPREV) was conducted at the request of the Finnish government, hosted by the Finnish Radiation and Nuclear Safety Authority (STUK), with the mission taking place from August 24 to September 2. The review team focused on assessing Finland's arrangements and capabilities for responding to nuclear and radiological emergencies, benchmarking them against IAEA safety standards. Finland currently operates five nuclear power reactor units at two sites: the Loviisa Nuclear Power Plant and the Olkiluoto Nuclear Power Plant. The Loviisa plant is located approximately 90 kilometers northeast of Helsinki, while the Olkiluoto plant is situated approximately 270 kilometers northwest of Helsinki. The Olkiluoto site also hosts the Onkalo spent nuclear fuel geological repository, the world's first geological disposal facility for final disposal of spent fuel.

2026-09-03

U.S. Lightbridge Selected for DOE LaunchPad INL Program to Advance Commercialization of Advanced Nuclear Fuel

Lightbridge Corporation, a U.S. advanced nuclear fuel technology company, announced on August 31 that it has been selected for the Nuclear Energy LaunchPad program (LaunchPad INL) managed by the U.S. Department of Energy's (DOE) National Reactor Innovation Center (NRIC) at Idaho National Laboratory (INL). The company stated that the program will provide an accelerated pathway for it to design, construct, and operate a dedicated facility at INL to manufacture lead test assemblies (LTAs) of Lightbridge Fuel™, with subsequent testing supported at U.S. commercial nuclear power plants. Lead test assemblies are generally regarded as a critical qualification step for nuclear fuel after reactor testing and before commercial fuel sales...

2026-09-01

Finland's 2025 Environmental Radiation Monitoring Shows No Harmful Effects from Nuclear Power Plant Operations

The 2025 environmental radiation monitoring results released recently by the Radiation and Nuclear Safety Authority of Finland (STUK) show that radioactive substance levels in the Finnish environment generally remained low, and the operation of the Loviisa and Olkiluoto nuclear power plants has not caused harmful radiation impacts on the public or the environment. STUK continuously tracks Finland's radiation situation through its environmental radiation monitoring program. The monitoring includes continuous measurement of external radiation, as well as monitoring of radioactive substances in air, radioactive fallout, water bodies, food, and the human body, with the aim of promptly detecting changes in radiation levels and confirming the safety of the living environment. Finland's automatic external radiation monitoring network covers essentially the entire country. In 2025, 255 monitoring...

2026-08-31

Finland's Onkalo Spent Fuel Disposal Facility Starts Drilling of First Disposal Hole

On the afternoon of August 26, 2026, Finland's Onkalo spent fuel final disposal facility commenced drilling of its first disposal hole deep in the bedrock at Olkiluoto. Posiva stated that the drilling operation is being carried out at a depth of more than 400 meters underground, with the drill bit beginning to cut into the approximately 1.9-billion-year-old Olkiluoto bedrock. Kimmo Lehtola, Posiva's Operations Construction Manager, explained that a kick-off meeting had been held the day before the operation, focusing on reviewing safety matters, technical specifications, and the detailed drilling plan. On the morning and early afternoon of the drilling day, the team completed final adjustments to the equipment, after which the drilling rig began its work. He noted that the team had previously completed...

2026-08-28

Finland Launches Its First IAEA International Assessment of Radiation Emergency Preparedness

Finland has recently launched its first international assessment of radiation emergency preparedness. At the invitation of Finland's Ministry of Economic Affairs and Employment, an international expert team assembled by the International Atomic Energy Agency began assessing Finland's preparedness for radiation emergency response on August 25, with the work continuing through September 1. The assessment is coordinated by the Radiation and Nuclear Safety Authority of Finland. This authority also serves as the IAEA contact point and participates in this review as one of the assessed entities. The coordination group designated by Finland's Ministry of Economic Affairs and Employment is chaired by Karim Peltonen from the Radiation and Nuclear Safety Authority of Finland. The assessment employs the IAEA's Emergency Preparedness Review mechanism,...

2026-08-26

Finland's Olkiluoto 3 unit reduces power output due to main coolant pump fault

Finnish utility Teollisuuden Voima (TVO) said on August 17 that Unit 3 of the Olkiluoto nuclear power plant (OL3) will continue to operate at a stable power output of approximately 1,300 MW, about 84% of full capacity, for the coming weeks due to technical faults in two main coolant pumps in the nuclear island. The unit's rated generating capacity is approximately 1,600 MW. TVO stated that the faults were discovered during this summer. Since then, the unit has reduced its output power and investigations have been conducted into the causes of the faults and corrective measures. Under the latest arrangement, OL3 will continue operating at a reduced power level to monitor the effectiveness of corrective actions until the unit begins its scheduled annual outage on September 10, 2026. TVO...

2026-08-18

Finland's Olkiluoto 3 nuclear reactor reduces output by 450 MW due to fault

Finland's largest nuclear reactor, Olkiluoto 3 (OL3), is currently operating at a reduced power level of approximately 300 MW. The unit's normal net power output is around 1,600 MW, and its generation accounts for about 14% of Finland's total electricity demand. According to Teollisuuden Voima (TVO), as reported by Tekniikka & Talous, the power reduction is due to a fault in one of the reactor-side circulation pumps. The damaged circulation pump has been repaired and is under monitoring, and the power level of Unit 3 is expected to return to normal on August 18. The circulation pump's function is to circulate cooling water through the reactor core. Meanwhile, Olkiluoto 2 has also been operating at a reduced power level of approximately 155 MW since mid-July...

2026-08-14

Finland's Onkalo Spent Nuclear Fuel Final Disposal Facility Expected to Receive Operating License by Year-End

Finland's spent nuclear fuel final disposal project has entered the critical stage of operating license review. The Radiation and Nuclear Safety Authority of Finland (STUK) issued a statement saying that the design and emergency response procedures of the Onkalo final disposal facility meet the safety requirements for granting an operating license. The Finnish government is expected to decide whether to approve the facility's operation before the end of the year. Onkalo is located on Olkiluoto Island in southwestern Finland. "Onkalo" means "cave" in Finnish. If licensed and operational, the facility will become the world's first deep geological final disposal facility for spent nuclear fuel from nuclear power plants, serving as a reference for other countries considering similar facilities...

2026-08-14

Study Reveals Three-Dimensional Pore Networks Inside Uranium-Zirconium Metallic Nuclear Fuel

Researchers at the Massachusetts Institute of Technology (MIT), in collaboration with Idaho National Laboratory (INL), conducted three-dimensional imaging studies on irradiated uranium-10 zirconium metallic fuel, revealing the internal pore networks within the fuel and their relationship with chemical changes and fuel-cladding interactions. The researchers believe these results will help improve metallic fuel performance models, providing references for extending the operating cycles of certain reactors and for the design of next-generation sodium-cooled fast reactor fuel systems. Uranium-10 zirconium (U-10Zr) is a uranium-zirconium alloy metallic fuel containing 10% zirconium, which has been extensively tested in sodium-cooled fast reactors such as Experimental Breeder Reactor II (EBR-II) and the Fast Flux Test Facility (FFTF). As advanced reactor research and development progresses, this type of metallic fuel has regained attention, but the details of pore formation, swelling, heat transfer, and interactions with cladding materials under reactor irradiation conditions still require further clarification.

2026-08-13

Finland's Loviisa Nuclear Power Plant Launches Turbine Island Upgrade to Support Operation Until 2050

Finnish utility Fortum has launched a large-scale modernization project for the turbine island at the Loviisa Nuclear Power Plant. The project aims to increase the plant's electrical output and ensure the continued, safe, and reliable operation of both units through the end of 2050 under the new operating licenses. The Loviisa plant consists of two VVER-440 pressurized water reactor units and is Finland's first nuclear power plant, currently supplying more than 10% of the country's electricity. Unit 1 entered commercial operation in 1977, followed by Unit 2 in 1981, and the Finnish government approved the extended operating licenses in February 2023. The core of this upgrade is the modernization of the low-pressure turbines, which is the largest single undertaking in the Loviisa turbine island upgrade...

2026-08-12

Finland's Onkalo Repository to Be Commissioned, Experts Say 100,000-Year Safety Assessment Still Faces Uncertainties

Finland's Olkiluoto is about to commission the world's first permanent deep geological repository for spent nuclear fuel — Onkalo. The facility is designed for long-term underground containment of spent fuel, with a design safety period of up to 100,000 years. There remains debate within the nuclear industry over whether such facilities can remain safe over such an immense timescale. Dmitry Pripachkin, head of the Department of Radiation Physics and Nuclear Technology Safety at the National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), stated that modern science does not yet possess tools capable of reliably predicting the state of such facilities after 100,000 years. Science can study the evolution of geological formations over long historical periods, but...

2026-08-09