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Toshiba Energy Systems Selected for Next-Generation Innovative Reactor Core Structure R&D and Demonstration Project

On September 9, 2026, Toshiba Energy Systems & Solutions Corporation (Toshiba ESS) announced that it has been selected for the second round of public solicitation under the Japanese Ministry of Economy, Trade and Industry's FY2025 supplementary budget project "Support Program for Technology Development and Supply Chain Construction for Next-Generation Innovative Reactor Development and Construction," undertaking the "Next-Generation Innovative Reactor Core Structure R&D and Manufacturing Demonstration Project (Phase 2)." Figure: Image of iBR internal structure Following this selection, Toshiba Energy Systems will further expand its R&D efforts in reactor internal structures, building on the six projects previously selected in the first round. The company plans to collaborate with suppliers to...

2026-09-09

Hitachioomiya City Assembly in Ibaraki Prefecture, Japan, discusses literature survey request for nuclear waste disposal site

Hitachioomiya City in Ibaraki Prefecture, Japan, received a request from Japan's Ministry of Economy, Trade and Industry (METI) asking the city to accept a literature survey for the siting of a final disposal facility for high-level radioactive waste. On September 8, the Hitachioomiya City Assembly held a general question-and-answer session, during which multiple city assembly members expressed their views on whether to accept the survey. Of the five assembly members who filed questions that day, two expressed opposition to accepting the request and one expressed support. The assembly plans to hold a closed-door meeting on September 9, at which each assembly member will state their position, and the relevant content will subsequently be conveyed to Mayor Sadayuki Suzuki for his consideration in formulating the city government's response. Assembly member Toshiyuki Kurata stated that if the literature survey proceeds, it would impact the policies and projects currently being implemented by the city...

2026-09-09

Restart of Unit 3 at Japan's Tomari Nuclear Power Plant May Be Delayed to After End of 2027

The restart of Unit 3 at the Tomari Nuclear Power Plant, operated by Hokkaido Electric Power in Tomari Village, Hokkaido, Japan, may be delayed to after the end of 2027. The company currently maintains its stated target of a restart in early 2027, but has not yet provided a specific date. Key factors affecting the restart schedule include delays in the construction of the tsunami protection embankment, a fatal accident during construction that occurred during the review process by the Nuclear Regulation Authority (NRA) of Japan, and certain technical matters that remain under confirmation and consultation. Hokkaido Electric Power has stated that the embankment is expected to be completed by mid-August 2027. The project was originally scheduled for completion around March 2027, but has been extended due to blizzard conditions and additional...

2026-09-08

Japanese Research Uses Tau PET to Reveal Association with Symptom Progression in Progressive Supranuclear Palsy

A research team at the National Institutes for Quantum Science and Technology (QST) in Japan recently announced findings from a study on progressive supranuclear palsy (PSP). Using their self-developed tau PET imaging technology, the researchers conducted follow-up scans on the same group of PSP patients at approximately one-year intervals, confirming for the first time in living brains that the faster tau protein accumulates in the globus pallidus region deep within the brain, the faster patient symptoms progress. The findings were published on September 5, 2026, in the international neurology journal *Movement Disorders*. Characteristic tau protein accumulation regions in PSP Progressive supranuclear palsy is a progressive neurodegenerative disease occurring in middle-aged and older adults, with common manifestations including increased risk of falls, difficulty with movement, eye movement disorders, postural instability, and cognitive dysfunction. There is currently no therapy that can cure or halt disease progression; therefore, establishing biomarkers that can objectively reflect disease changes and treatment efficacy has been a critical issue in drug development. Previous autopsy studies have shown that abnormal tau protein accumulation in the brains of PSP patients is an important pathological feature, particularly concentrated in deep brain regions such as the globus pallidus and midbrain. However, autopsy samples cannot be used for long-term dynamic observation, and how tau protein accumulation changes over time and how it corresponds to symptom progression had previously remained unclear. In recent years, positron emission tomography (PET) has made it possible to observe tau protein in living brains, but existing studies have mainly shown that tau protein increases over time without sufficiently demonstrating a direct association between these changes and symptom worsening. In this study, the research team used the PET radiopharmaceutical 18F-PM-PBB3 developed by QST, namely florzolotau (18F), to perform two PET examinations on 26 PSP patients and 10 healthy controls, conducted at baseline and approximately one year later. The researchers combined 57 brain regions identified by MRI and performed multivariate analysis of PET signal changes to identify PSP-related tau protein accumulation regions and their spread over time. The results showed that at baseline, tau protein in PSP patients was primarily accumulated in subcortical regions such as the globus pallidus and midbrain, consistent with previous reports. Follow-up imaging at one year showed further increases in tau protein accumulation in the globus pallidus, along with marked increases in tau accumulation in the frontoparietal lobes and cerebellar white matter, suggesting that during the course of PSP, tau protein may spread from deep brain regions to the cerebral cortex and cerebellar-related areas. The research team further focused on Richardson's syndrome, the most typical and common subtype of PSP. This subtype typically progresses rapidly, and the 18 patients with this subtype included in this study showed significant increases in PSP rating scale scores within one year. The analysis found that changes in tau protein accumulation in the globus pallidus showed the strongest correlation with the degree of symptom progression; that is, the faster tau protein accumulated in this region, the more pronounced the worsening of patient symptoms. Analyses of individual patients likewise showed that globus pallidus tau protein accumulation can reflect the course of PSP from mild to severe stages. The researchers believe that serial tau PET imaging has the potential to serve as a novel imaging biomarker for assessing PSP disease progression, and also provides a basis for tau-targeted therapeutic strategies: if future therapies can inhibit tau protein accumulation, it may be possible to slow symptom progression. Next steps still require longer-term follow-up in a larger number of patients to validate the relationship between changes in tau protein accumulation and overall symptom progression and treatment response. The imaging assessment method established in this study may not only be used for disease monitoring and clinical trial efficacy evaluation in PSP, but may also be extended to research on other tau protein-related neurodegenerative diseases and dementias, providing new technical support for the diagnosis and therapeutic development of related diseases.

2026-09-07

Japanese research team accelerates muons to 0.3 MeV, taking a step toward the world's only muon accelerator

A research team comprising the J-PARC Center, High Energy Accelerator Research Organization (KEK), the University of Tokyo, Tokai National Higher Education and Research System, Nagoya University, and RIKEN recently completed muon cooling and radio-frequency acceleration experiments in the newly constructed muon acceleration experimental area at the J-PARC Materials and Life Science Experimental Facility, successfully accelerating muons to a kinetic energy of 0.3 MeV, corresponding to approximately 8% of the speed of light. Conceptual diagram of cooling and accelerating positive muon beams. By cooling positive muons with non-uniform direction and velocity, efficient high-frequency acceleration can be achieved. Muons are elementary particles similar to electrons that can be artificially produced by accelerators and are widely used in materials science, particle physics research...

2026-09-07

Japan Selects Four Companies for Fusion Power Program

Japan's Ministry of Economy, Trade and Industry (METI) has conditionally selected EX-Fusion, Helical Fusion, Linea Innovation, and Starlight Engine to participate in a fusion program targeting reactor operation in the 2030s. The program will provide approximately $370 million, equivalent to around €318 million, in subsidies to selected projects by the end of February 2029. Specific funding allocations are still subject to formal grant decisions. The support corresponds to commitments in Japan's 2023 fusion strategy, which sets out the goal of achieving fusion power in the 2030s...

2026-09-07

Tottori Prefecture nuclear safety advisory council approves safety of MOX fuel plan for Shimane Unit 2

The Tottori Prefecture Nuclear Safety Advisory Council held a meeting in Yonago City on September 6 and submitted an opinion on the MOX fuel power generation project planned by Chugoku Electric Power Co. for Unit 2 of the Shimane Nuclear Power Station. The opinion stated that, based on explanations provided by Chugoku Electric Power Co. and the Japanese government, the safety of the project can be ensured. The Shimane Nuclear Power Station is located in Matsue City, Shimane Prefecture. Chugoku Electric Power Co. plans to use mixed oxide fuel, or MOX fuel, consisting of uranium and plutonium, in Unit 2. This type of power generation is also referred to as plutonium thermal power generation in Japan. The opinion also...

2026-09-07

Hitachiomiya City Assembly in Japan Hears Briefing on Literature Survey for High-Level Radioactive Waste Disposal Site

On September 4, the Hitachiomiya City Assembly in Ibaraki Prefecture, Japan, held a closed-door briefing session regarding the central government's request for the city to initiate a literature survey for the final disposal site selection of high-level radioactive waste. Representatives from the Ministry of Economy, Trade and Industry (METI) and the Nuclear Waste Management Organization of Japan (NUMO) attended the meeting to explain the national energy policy, an overview of the geological disposal project, and the background behind the survey request. All 16 members of the Hitachiomiya City Assembly participated in the briefing, with Mayor Suzuki Sadayuki attending as an observer. The meeting was originally scheduled for approximately two hours but actually lasted about three and a half hours due to the large number of questions from assembly members. After the meeting, Yokote Hiroki, Director of the Radioactive Waste Policy Division at METI's Agency for Natural Resources and Energy, stated that assembly members raised questions covering multiple aspects, including technical details of geological disposal and the site selection procedure for disposal facilities, and that the government side would continue its outreach efforts. Should the City Assembly make a request, METI would provide further explanations.

2026-09-06

Takahama Nuclear Power Plant in Japan to Transport 1,600 Drums of Low-Level Radioactive Waste

Kansai Electric Power announced on September 4 that it will transport low-level radioactive waste generated at the Takahama Nuclear Power Plant to the Low-Level Radioactive Waste Disposal Center of Japan Nuclear Fuel Limited (JNFL) in Rokkasho Village, Aomori Prefecture. According to the plan, the dedicated low-level radioactive waste transport vessel Seiei Maru will berth at the Takahama Nuclear Power Plant on September 5 and depart on September 12 after loading is completed. If the transport schedule is adjusted due to factors such as weather conditions, Kansai Electric Power will announce the actual situation separately. This shipment consists of 200 dedicated containers holding 1,600 waste drums, all of which are cement-solidified waste, excluding homogeneously solidified waste.

2026-09-04

Japan's Tomari Nuclear Power Plant Unit 3 Restart Review Still Requires Additional Fire Safety Documentation

On September 3, a review meeting was held for the restart plan of Unit 3 at Japan's Tomari Nuclear Power Plant. The Nuclear Regulation Authority (NRA) pointed out that the explanations submitted by Hokkaido Electric Power regarding fire safety measures still contain issues requiring further confirmation, and requested the company to provide more detailed assessment materials. The equipment design and construction plan required for the restart of Tomari Unit 3 has been under review since last year. One of the current review priorities is whether relevant workers have adequate and feasible evacuation measures in the event of a fire on site. At the meeting that day, representatives of Hokkaido Electric Power explained the revised fire safety...

2026-09-04

Fire alarms triggered nine times in four weeks at Japan's Fukushima Daiichi Nuclear Power Station

At 21:44 on September 3, a fire alarm was triggered in the water treatment control room building of Japan's Fukushima Daiichi Nuclear Power Station. Tokyo Electric Power Company (TEPCO) stated that no open flames or smoke were found at the scene. After firefighters arrived and conducted inspections, it was confirmed shortly after 22:30 that evening that this was not a fire. TEPCO said it would subsequently inspect the relevant detectors. Including this incident, the Fukushima Daiichi Nuclear Power Station has triggered a total of nine fire alarms in the past four weeks. Previously, on August 8, a fire alarm was triggered in the maintenance building for Units 5 and 6; on August 12, an alarm sounded in the emergency diesel generator room for the high-pressure core spray system of Unit 6; on August 13, an alarm sounded in the main office building; on August 15, an alarm sounded in the southwest stairwell area of the turbine building for Unit 5...

2026-09-04

New Fuel Delivery Completed at Japan's Sendai Nuclear Power Plant

Kyushu Electric Power Co. announced on September 2 that new fuel required for Units 1 and 2 of Japan's Sendai Nuclear Power Plant has been delivered. The transport operation began on August 30, 2026, and concluded on September 2. According to information released by Kyushu Electric Power, the new fuel delivered this time was manufactured by Nuclear Fuel Industries, Ltd. Specifically, Unit 1 of the Sendai Nuclear Power Plant received 24 new fuel assemblies transported in 12 shipping containers, while Unit 2 received 28 new fuel assemblies transported in 14 shipping containers. The new fuel transport was carried out using a combination of land and sea routes. Kyushu Electric Power stated...

2026-09-03

Second Phase of Decommissioning for Unit 1 of Japan's Ikata Nuclear Power Plant Approved by Prefectural Committee

The Environmental Safety Management Committee for the Ikata Nuclear Power Plant in Ehime Prefecture, Japan, held a meeting in Matsuyama City on September 2 to discuss plans by Shikoku Electric Power to proceed with the second phase of decommissioning for Unit 1 of the Ikata Nuclear Power Plant. The unit, located in Ikata-cho, Ehime Prefecture, is currently in the process of being decommissioned. The decommissioning of Unit 1 at the Ikata Nuclear Power Plant has been divided into four main phases. Shikoku Electric Power had previously conducted prior consultations with Ehime Prefecture and Ikata-cho regarding the transition to the next phase, obtained local consent, and submitted relevant applications to Japan's Nuclear Regulation Authority (NRA). In July of this year, the NRA approved the application...

2026-09-03

Japanese regulator plans budget for research on next-generation reactor reviews

The Nuclear Regulation Authority (NRA) of Japan has included research costs required for reviewing next-generation nuclear reactors in its budget request for the next fiscal year. The funds will be used to evaluate the effectiveness of new safety measures, providing a review basis for potential future construction or replacement applications. The Japanese government is promoting the development of next-generation nuclear reactors, including innovative light-water reactors that further enhance safety performance based on existing light-water reactor technology. Since November 2025, Kansai Electric Power Company (KEPCO) has been conducting geological surveys at the Mihama Nuclear Power Plant in Fukui Prefecture, in preparation for possible future plans to replace existing units with next-generation reactors. At a meeting held on September 2...

2026-09-03

Japan considers expanding reuse of decontaminated soil from Fukushima

Japan's Environment Minister Ishihara stated after a Cabinet meeting on September 1 that the government is considering and coordinating efforts to continue the decontaminated soil reuse project from Fukushima Prefecture at government offices and other locations in other regions, in order to raise public awareness of the relevant systems and safety management approaches. Following the Fukushima Daiichi Nuclear Power Station accident, large volumes of soil removed during decontamination operations in Fukushima Prefecture are currently stored at an interim storage facility within the prefecture. Under Japanese law, this soil must be finally disposed of outside the prefecture by March 2045. To reduce the volume of final disposal, the Japanese government is promoting the reuse of decontaminated soil with lower radiation levels. Late last month, construction work was carried out at national government joint office buildings in Sendai City and Saitama City, with soil for flower beds and other areas delivered to the sites. This marked the first time decontaminated soil was reused at such government facilities outside the Tokyo region.

2026-09-03