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Mutsu City in Japan agrees to study receiving fuel from other companies at interim spent fuel storage facility

On August 7, Mutsu City in Aomori Prefecture, Japan, notified Tokyo Electric Power Company Holdings (TEPCO Holdings) and Japan Atomic Power Company (JAPC) that it agreed to allow the two companies to study a plan to receive spent nuclear fuel from other electric power companies at the local interim spent fuel storage facility. The facility, promoted and constructed by entities related to the two companies, is the only facility in Japan located outside nuclear power plant sites for interim storage of spent nuclear fuel. Under the current arrangement, the facility only accepts spent nuclear fuel from TEPCO Holdings and JAPC, and spent nuclear fuel from other companies is not permitted to be transported in. On the same day, Mutsu City Mayor Tomoya Yamamoto met with senior executives of the two companies at City Hall...

2026-08-07

New Decommissioning Plan for Fukushima Daiichi: Priority on Internal Investigation of Unit 3 Before Fuel Debris Retrieval

The Nuclear Damage Compensation and Decommissioning Facilitation Corporation of Japan released on August 6 an outline of the 2026 edition of the "Decommissioning Strategic Plan," proposing technical approaches for the decommissioning of Tokyo Electric Power Company's Fukushima Daiichi Nuclear Power Station. The plan highlights that, for the large-scale retrieval of melted fuel debris at Unit 3, expected to commence in or after fiscal year 2037, priority should currently be given to internal investigations of the reactor building to provide a more reliable basis for subsequent engineering plans. The plan states that the fuel debris retrieval method being studied by TEPCO still requires further improvement in certainty, with the key prerequisite being an understanding of the actual internal conditions of the reactor. Due to the high radiation levels of the water inside the unit following the accident...

2026-08-07

Radiation detector malfunction at Unit 2 of Japan's Onagawa Nuclear Power Plant causes hundreds of abnormal reading fluctuations

Tohoku Electric Power Company of Japan announced on August 6 that a detection equipment malfunction occurred at Unit 2 of the Onagawa Nuclear Power Plant, located in Onagawa Town and Ishinomaki City, Miyagi Prefecture. The issue involved detectors used to measure radiation levels in the main steam lines, which transport steam generated by the reactor to the turbine. Among the four detectors, one displayed readings in the central control room that surged and dropped sharply, repeating hundreds of times. Based on publicly available information, Tohoku Electric has classified this incident as a detector malfunction rather than an abnormal release of radioactive materials or a sudden change in reactor operating conditions. The company stated that the situation does not constitute a problem under security regulations, meaning that from...

2026-08-07

IAEA Director General to Inspect Kashiwazaki-Kariwa Nuclear Power Plant

Preparations are in the final stages for IAEA Director General Rafael Grossi's first inspection of Tokyo Electric Power Company's Kashiwazaki-Kariwa Nuclear Power Plant, expected to take place on August 18. Grossi has previously stated that there are "no obstacles to a swift restart," signaling a positive attitude toward the plant's reactivation. This inspection suggests that discussions surrounding the restart may accelerate. However, it is worth noting that local residents still harbor concerns, adopting a cautiously optimistic outlook on future developments. This marks Grossi's first visit to the Kashiwazaki-Kariwa plant, making it a significant event. Against the backdrop of growing attention to nuclear safety, the IAEA's...

2026-08-06

Japanese PET Study Suggests Late-Onset Psychosis May Be Linked to Neurodegenerative Pathology

A nuclear medicine imaging study conducted by a Japanese research team has shown that many adults who experience psychotic symptoms such as hallucinations and delusions for the first time after age 40 have abnormal protein deposits in the brain associated with Alzheimer's disease and other neurodegenerative disorders. The study included 37 patients with late-onset psychosis and 47 age-matched healthy controls. The researchers used the amyloid PET tracer ^11C-PiB and the tau protein PET tracer ^18F-florzolotau to assess the accumulation of β-amyloid and tau proteins in the participants' brains. The results showed that among patients with late-onset psychosis, β-amyloid positivity...

2026-08-06

Japan's Plutonium Stockpile Expected to Remain at 44.4 Tons by End of 2025

Japan's Cabinet Office reported to the Japan Atomic Energy Commission (JAEC) on August 5 that Japan's plutonium stockpile is expected to be 44.4 tons by the end of 2025, unchanged from the end of the previous year. By source, domestically sourced plutonium stockpile is expected to be 9.9 tons, while overseas-sourced plutonium stockpile is 34.5 tons. The overseas-sourced plutonium mainly comes from separated plutonium formed after Japan entrusted its spent fuel reprocessing operations to the United Kingdom and France. The report shows that in 2024, Kansai Electric Power Company (KEPCO) processed 1.3 tons of plutonium stored in France into mixed uranium-plutonium oxide fuel, namely MOX fuel, resulting in a decrease in overseas-sourced plutonium stockpile. Subsequently, this batch of MOX fuel was shipped to the Takahama Nuclear Power...

2026-08-06

Shimane Nuclear Power Station Unit 2 scheduled inspection completion date moved up to September 16

Chugoku Electric Power Co., Inc. announced on August 5 that the schedule for the 18th periodic utility inspection of Shimane Nuclear Power Station Unit 2 has been revised, with the inspection completion date moved up from September 17, 2026 to September 16, and the power generation resumption date moved up from August 19 to August 18. Shimane Nuclear Power Station Unit 2 is a boiling water reactor unit with a rated electrical output of 820 MW. The unit was shut down on February 9, 2026 and entered its 18th periodic utility inspection. The reason for this adjustment is that, during the reactor start-up preparation work, the procurement of the nitrogen gas source used to fill the reactor containment vessel was completed earlier than planned, allowing the related work to be advanced accordingly...

2026-08-05

Japan Nuclear Security System Introduces SmartHR to Advance Centralized HR Data Management

On August 5, SmartHR Inc. announced that Japan Nuclear Security System Co., Ltd. has adopted its back-office system SmartHR for personnel and organizational management, to promote paperless HR operations and centralized employee information management. Japan Nuclear Security System, headquartered in Minato-ku, Tokyo, provides comprehensive security services for nuclear-related facilities, particularly nuclear power plants, through a combination of mechanical security and personnel security. One of the direct reasons for introducing the new system is that the company's existing HR system has ceased support, necessitating the selection of a replacement. Previously, ...

2026-08-05

Mitsubishi Heavy Industries to Fully Develop Small Modular Reactors, Targeting Commercialization in Japan

Against the backdrop of the Japanese government's push to expand nuclear energy utilization, Mitsubishi Heavy Industries has decided to proceed with full-scale development of Small Modular Reactors (SMRs), with the goal of achieving commercial application in Japan. This is seen as a significant step forward by a Japanese private enterprise toward the practical deployment of SMRs. The Basic Energy Plan approved by Japan's Cabinet last year calls for maximizing the use of nuclear energy. At a ministerial meeting held last week, the Japanese government once again confirmed its commitment to advancing the research, development, and deployment of next-generation nuclear reactors. SMRs represent one of the technology pathways for next-generation nuclear reactors. Due to their smaller unit size and higher degree of modularization, the industry generally...

2026-08-05

Shimane Nuclear Power Plant Unit 2 Completes Fuel Replacement and Installs Containment Vessel Head

Chugoku Electric Power Co. on August 4 disclosed the installation work of the containment vessel head for Unit 2 of the Shimane Nuclear Power Plant. The unit is currently undergoing periodic inspection, with major procedures such as nuclear fuel replacement already completed. Unit 2 of the Shimane Nuclear Power Plant, located in Matsue City, Japan, was restarted two years ago. Chugoku Electric Power Co. halted the unit's operation in February this year and has been conducting periodic inspections as scheduled. To date, all 560 nuclear fuel assemblies in the unit have been removed, and safety confirmation of the reactor core has been completed. Approximately 120 of these fuel assemblies were replaced with new nuclear fuel assemblies, followed by the phase of resetting related equipment and confirming seal integrity...

2026-08-05

Approximately 13,000 liters of water found in Unit 3 of Hamaoka Nuclear Power Plant; Chubu Electric continues investigation into data falsification

Japan's Chubu Electric Power announced on August 4 that water accumulation totaling approximately 13,000 liters was found in the turbine building and related areas of Unit 3 at the Hamaoka Nuclear Power Plant. The company stated that the accumulated water contains no radioactive substances and is currently investigating the specific cause. According to Chubu Electric Power, at around 11:00 a.m. on the 4th, a worker from a partner company discovered approximately 5 liters of water in a passageway on the northwest side of the first basement floor of the turbine building adjacent to the reactor building of Unit 3. Subsequently, company personnel continued on-site inspections and confirmed at around 3:00 p.m. the same day that approximately 13,000...

2026-08-05

Water Leak at Pipe Joint of Primary Cooling Pump in Unit 2 of Takahama Nuclear Power Plant; Kansai Electric Confirms No Radioactive Impact

Kansai Electric Power announced on August 3 that a water leak was found at a cooling water pipe joint in Unit 2 of the Takahama Nuclear Power Plant in July. According to Kansai Electric Power, an inspection crew discovered the issue during a check inside the intermediate building on July 11, with a leak volume of approximately 3.4 liters, and repairs were carried out on the 14th. The leak occurred at the pipe connection of the No. 1 cooling water pump during a periodic inspection. The pipe has an outer diameter of 2 centimeters, is secured by threaded fittings, and was sealed with sealing tape. Kansai Electric Power preliminarily determined that the leak may have been caused by tape deterioration due to friction or insufficient wrapping. Currently, Kansai Electric Power re-wrapped the sealing tape on the 14th, and Unit 2 of the Takahama Nuclear Power Plant resumed normal operation on July 16, with no other abnormalities identified to date. It is worth noting that the taped section had undergone a disassembly inspection in 2018, when the plant was in a long-term shutdown state.

2026-08-04

Japanese research team experimentally demonstrates that fusion plasma fluctuations can drive inward particle transport

August 3, 2026, a research team from The University of Tokyo and the National Institute for Fusion Science (NIFS) under the National Institutes of Natural Sciences announced that researchers have directly observed in experiments that low-frequency electric field fluctuations in high-temperature plasma confined by a dipole magnetic field can transport particles to the central region of the plasma. Plasma produced by the levitated dipole experiment device RT-1 (Ring Trap 1) Overall view of the RT-1 device (Kashiwa Campus, The University of Tokyo) The study was conducted using the levitated dipole experiment device Ring Trap 1 (RT-1) at The University of Tokyo. RT-...

2026-08-03

United Imaging Healthcare's New-Generation Digital PET/CT "uMI Panvivo" Enters Clinical Use in Japan

August 3 news, United Imaging Healthcare Japan Co., Ltd. announced that the first unit in Japan of its new-generation digital PET/CT scanner uMI Panvivo has been put into clinical use at Saitama Central Clinic, located in Omiya-ku, Saitama City. Saitama Central Clinic is a medical institution specializing in diagnostic imaging. Since its opening in 2009, the clinic has continuously conducted comprehensive cancer screening centered on PET/CT scans, and provides FDG-PET cancer examination services based on the needs of local medical institutions, with an annual PET/CT examination volume ranking among the highest in Japan. With the introduction of uMI Panvivo, the clinic expects to further shorten examination time and enhance image quality on the basis of its existing high-precision diagnostic imaging...

2026-08-03

Japanese research team experimentally confirms full-gap spin-triplet superconductivity in UBe13

On July 30, 2026, Kobe University and the Japan Atomic Energy Agency announced that a research team led by Professor Hideki Higashibata of the Graduate School of Science at Kobe University, along with Shoko Minami, who was a master's student at the time of the research, in collaboration with Yoshinori Haga, Research Director at the Japan Atomic Energy Agency, and researchers from Osaka University, experimentally confirmed for the first time the existence of a spin-triplet superconducting state with full-gap characteristics in the intermetallic compound UBe13. The findings were published in the Journal of the Physical Society of Japan on June 26 and were selected as an Editor's Choice paper. Since its discovery in 1983, UBe13 has been regarded as an important candidate material for spin-triplet superconductivity. Unlike conventional spin-singlet superconductivity...

2026-08-03