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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

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

Japan Plans to Introduce Physical AI into Fukushima Daiichi Nuclear Power Station Decommissioning

The Japanese government and Tokyo Electric Power Company (TEPCO) are preparing to introduce Physical AI technology into the decommissioning operations at the Fukushima Daiichi Nuclear Power Station to enhance the autonomous operational capabilities of robots in high-radiation environments. This technology enables artificial intelligence to autonomously control robots based on on-site conditions, performing tasks such as inspection, data collection, and cleanup. To advance this effort, an advisory organization involving the government, businesses, universities, and research institutions is planned to be established within the year, with discussions centered on technology development, equipment application, and on-site verification. The organization is expected to be led by relevant government ministries and TEPCO, and will include AI startups, robot manufacturers, and university researchers.

2026-09-01

Fukushima Daiichi Nuclear Power Station begins 23rd discharge of treated nuclear-contaminated water

At 11:29 on August 31, Fukushima Daiichi Nuclear Power Station began its fifth discharge of treated nuclear-contaminated water in fiscal year 2026 and the 23rd overall. The operation is scheduled to last 19 days, concluding on September 18, with an estimated discharge of approximately 7,800 tonnes of nuclear-contaminated water diluted with seawater, equivalent to the capacity of about 8 storage tanks. The total tritium content is estimated at approximately 1.2 trillion becquerels. The reactors of Units 1 to 3 at Fukushima Daiichi still contain nuclear fuel that melted and solidified during the accident, known as fuel debris. Groundwater and rainwater that come into contact with this fuel debris form contaminated water. Since the discharge of treated nuclear-contaminated water began in August 2023, Fukushima Daiichi has cumulatively released approximately 173,000 tonnes, equivalent to about 173 storage tanks' capacity.

2026-09-01

Decontaminated soil from Fukushima used in flower beds at Saitama municipal government building

Decontaminated soil generated after the Fukushima Daiichi Nuclear Power Station accident was transported on August 30 to a government building in Saitama City, Japan, and used in a reuse project for on-site flower beds. The work took place at the Saitama Shintoshin Joint Government Building in Chuo Ward, Saitama City. Approximately one cubic meter of decontaminated soil was brought to the site, where workers dug holes in the flower beds, filled the soil to a depth of about 20 centimeters, and then covered it with approximately 20 centimeters of ordinary soil. Similar decontaminated soil reuse work was carried out on August 29 at the Sendai Joint Government Building in Miyagi Prefecture. Apart from demonstration projects within Fukushima Prefecture, this is the second reuse case conducted outside the Tokyo area. On the day of the work, approximately...

2026-08-31

Japan to Establish New Decontamination Base in Okuma, Fukushima

Japan's Ministry of the Environment has decided to establish a new work base in Okuma Town, Fukushima Prefecture, in the next fiscal year to coordinate decontamination and house demolition work in difficult-to-return zones following the accident at Tokyo Electric Power Company (TEPCO)'s Fukushima Daiichi Nuclear Power Station, aiming to accelerate environmental recovery in the affected areas. Within seven municipalities surrounding the Fukushima Daiichi Nuclear Power Station, approximately 309 square kilometers have been designated as difficult-to-return zones. These areas remain under strict control, with restrictions on residential habitation and entry, and evacuation orders remain in effect. Within the difficult-to-return zones, the Japanese government has established "specified return residential areas" and plans to advance decontamination, house demolition, and other measures based on residents' intentions to return. The proposed new base in Okuma Town will be responsible for on-site management and project coordination, with approximately 30 staff members expected to be assigned, and the relevant branch office currently located in Hirono Town will be relocated to Okuma Town.

2026-08-30

Hole of about 3 meters confirmed at bottom of reactor pressure vessel of Unit 3 at Fukushima Daiichi Nuclear Power Station

Tokyo Electric Power Company (TEPCO) announced on August 27 that a hole approximately 3 meters in diameter has been confirmed at the bottom of the reactor pressure vessel of Unit 3 at the Fukushima Daiichi Nuclear Power Station. The pressure vessel is a steel container that held nuclear fuel before the accident, with a cylindrical shape and a diameter of about 5.5 meters. This is the first time since the core meltdown accident at Units 1 to 3 of the Fukushima Daiichi Nuclear Power Station in 2011 that the specific size and shape of such a hole have been confirmed on the pressure vessel. The hole is believed to be related to the falling of melted nuclear fuel during the 2011 accident. After the accident, the containment vessel of Unit 3 has maintained a relatively high water level for an extended period, and access routes into the containment vessel are limited. TEPCO previously used a micro drone measuring approximately 12 centimeters per side...

2026-08-28

TEPCO replaces faulty motor of robotic arm at Fukushima Daiichi Unit 2

Tokyo Electric Power Company (TEPCO) began replacing the faulty motor of the robotic arm used for fuel debris retrieval trials at Unit 2 of the Fukushima Daiichi Nuclear Power Station on August 26. The robotic arm, approximately 22 meters long, is planned for use in the third fuel debris retrieval trial. During a previous operational inspection inside the reactor building of Unit 2, TEPCO found that the motor driving the robotic arm had malfunctioned, preventing the brake from releasing and the arm from extending. As the robotic arm is already installed on site, workers will enter the "front chamber" in front of the containment vessel to perform the replacement manually. The company stated that radiation levels in the work area will be strictly controlled to prevent workers from receiving excessive exposure. After this replacement, TEPCO will...

2026-08-27

Japan to Use Fukushima Decontaminated Soil at Government Office Buildings in Sendai and Saitama

At a Cabinet meeting held at the Prime Minister's Office on August 25, the Japanese government decided to use decontaminated soil generated from the Tokyo Electric Power Company (TEPCO) Fukushima Daiichi Nuclear Power Station accident for flower beds and other areas at joint government office buildings in Sendai City and Saitama City. This will mark the first use of such recycled soil outside Tokyo. According to the plan, the relevant office buildings will use a total of approximately 2 cubic meters of low-radioactivity "reconstruction recycled soil," with the specific construction schedule still being coordinated. The usage site in Saitama City is located at the government joint office building in the Saitama New Urban Center area, and Sendai City will also implement similar arrangements at its joint government office building. Under Japanese law, soil decontaminated after the Fukushima Daiichi Nuclear Power Station accident must be transported outside Fukushima Prefecture for final disposal by March 2045. The Japanese government hopes that by first using such soil in public facilities, it can promote the final disposal work outside Fukushima Prefecture and enhance public understanding of the safety and necessity of such soil.

2026-08-25

Japan's TEPCO Receives 4.8 Billion Yen in Nuclear Damage Compensation Funds

Tokyo Electric Power Company Holdings (TEPCO Holdings) announced on August 24 that it received a fund disbursement of 4.8 billion yen from the Nuclear Damage Compensation and Decommissioning Facilitation Corporation (NDF) on the same day. The disbursement was made in accordance with the revised Special Business Plan approved on March 31, 2026. TEPCO stated that, to date, it has received 188.9 billion yen in compensation under the Act on Compensation for Nuclear Damage, and a cumulative total of 11.5524 trillion yen in fund disbursements from the NDF. As the total compensation payments expected by the end of September 2026 are projected to exceed the combined amount of the above funds, the company applied for the 172nd fund disbursement. TEPCO said that while receiving institutional financial support, it will continue to advance compensation efforts for nuclear accident victims and meet related compensation demands. Information on claims and payment status, changes in cumulative total payments, and agreement amounts by category is available through the company's public channels.

2026-08-24

Three Years Since Japan Began Discharging Nuclear-Contaminated Water: Over 170,000 Tons Released Across 22 Rounds

Since August 24, 2023, Japan has been discharging nuclear-contaminated water from the Fukushima Daiichi Nuclear Power Station into the Pacific Ocean. As of August 24, 2026, Japan has completed a total of 22 rounds of discharge, with a cumulative volume of approximately 173,000 tons. It is understood that the volume of water stored in on-site tanks has decreased by about 7% compared to before the discharge began. Tokyo Electric Power Company plans to increase the discharge volume of nuclear-contaminated water starting from the current fiscal year and has set a target to complete the decommissioning of the nuclear power plant by 2051. ...

2026-08-24

Busan, South Korea Reports No Abnormal Radiation Detected in Seawater and Seafood Three Years After Fukushima Discharge

Busan Metropolitan City stated on August 24 that since the discharge of contaminated water from the Fukushima nuclear power plant began in 2023, the city has continuously conducted radiation monitoring and analysis of coastal seawater and seafood. The results show that the safety conditions of Busan's waters and seafood remain stable with no abnormal changes detected. According to Busan Metropolitan City, seawater radioactivity testing is currently conducted at 26 coastal points. Among them, samples from 14 coastal locations including Haeundae, Gwangalli, Dadaepo, Songdo, and Songjeong are analyzed by the Busan Metropolitan City Institute of Health and Environment and local university research institutions. Test results show that the concentrations of relevant radionuclides are far below the World Health Organization drinking water standards, with cesium-134,...

2026-08-24

Collective Radiation Dose of Workers at Japan's Fukushima Daiichi Nuclear Power Station Ranks Highest Nationwide

Japanese nuclear power plant operators are required to submit radiation management reports to the Nuclear Regulation Authority (NRA) annually, detailing the exposure status of plant workers. According to the relevant 2025 reports, the collective radiation dose of workers at Tokyo Electric Power Company (TEPCO)'s Fukushima Daiichi Nuclear Power Station remains significantly higher than at other Japanese nuclear plants, indicating that the radiological impact from post-accident on-site decommissioning and management work is still ongoing. By collective dose per plant, Fukushima Daiichi recorded 20.97 person-sieverts, the highest in Japan. This figure is nine times the 2.22 person-sieverts reported at Kansai Electric Power's Takahama Nuclear Power Station...

2026-08-24

No abnormalities detected at multiple nuclear power plants after earthquake in Ibaraki Prefecture, Japan

At around 2 a.m. on August 23, an earthquake struck the southern part of Ibaraki Prefecture, Japan, with a maximum seismic intensity of 5-lower observed in parts of Ibaraki Prefecture, Tokyo Metropolis, Saitama Prefecture, and Chiba Prefecture. The Japanese government subsequently established a liaison office at the Crisis Management Center of the Prime Minister's Official Residence. Japanese Prime Minister Sanae Takaichi stated that relevant departments have been instructed to verify the damage situation and promptly release accurate information to the public. The earthquake posed no risk of tsunami. Japan Atomic Power Company (JAPC) stated that a seismic intensity of 3 was observed in the area where the Tokai Daini Nuclear Power Plant is located in Tokai Village, Ibaraki Prefecture. The unit is currently shut down, and as of now...

2026-08-24

Fire alarm triggered for sixth time in August at Japan's Fukushima Daiichi Nuclear Power Station; fire department confirms no fire occurred

At approximately 3:54 a.m. on August 21, a fire alarm was triggered on the first floor of the access control building at the Fukushima Daiichi Nuclear Power Station. Tokyo Electric Power Company (TEPCO) stated that no open flames or smoke were found near the site; shortly after 5:00 a.m., the fire department confirmed that the alarm was not caused by a fire. Readings from radiation monitoring stations around the plant also showed no significant fluctuations. This was the sixth fire alarm at the Fukushima Daiichi Nuclear Power Station since the beginning of August. Previously, the maintenance building for Units 5 and 6 triggered a fire alarm on August 8; the emergency diesel generator room for the high-pressure core spray system of Unit 6 triggered a fire alarm on August 12; the main administration building triggered a fire alarm on August 13...

2026-08-21