Steam Leak Forces Shutdown of Japan's Mihama Nuclear Reactor No. 3

May 08, 2026 | News On Japan

FUKUI, May 08, 2026 (News On Japan) - A steam leak was detected early on May 8th at the Mihama Nuclear Power Plant's Unit 3 in Fukui Prefecture, prompting Kansai Electric Power to manually shut down the reactor.

According to Kansai Electric, steam was found leaking from an area near the high-pressure turbine shortly after 4 a.m., and operators manually stopped the reactor at 4:24 a.m.

The utility said the steam did not originate from water circulating through the reactor core and did not contain radioactive materials. The leak has already been brought under control.

Mihama Unit 3 resumed operations in 2021 after becoming one of Japan's first nuclear reactors to restart despite being more than 40 years old. The reactor has continued operating under extended safety approvals introduced following the 2011 Fukushima nuclear disaster.

Source: TBS

Nagoya Streets Flood as Linear Rainbands Hit Aichi and Gifu

Torrential rain caused widespread flooding across central Japan on September 8, inundating roads in central Nagoya and other cities as linear rainbands formed over Aichi and Gifu prefectures and authorities warned that similar conditions could develop in the Kanto region through September 9.

Tickets for Asian Games Selling Fast

Ticket sales for the Asian Games are gathering pace with less than two weeks until the competition begins, with more than 60% of tickets sold for the opening ceremony and 31 sports as of September 7, although organizers say seats remain readily available for events including soccer and baseball.

Gasoline Can and Knives Found After Deadly Gifu Cake Shop Blaze

Police investigating a fire that killed three people at a cake shop in Motosu, Gifu Prefecture, have found a gasoline container and multiple knives in the burned-out building and are examining whether a 70-year-old company executive who died after the incident brought the fuel to the scene.

Japanese Teens Spend Least Time on Social Media Among 24 Countries

Japanese 15-year-olds spend an average of 2.3 hours browsing social media during their weekday free time, the shortest amount among 24 countries surveyed, according to data from the Organization for Economic Cooperation and Development.

Man Arrested Over Six Suspicious Fires in Tokyo

A 58-year-old man has been arrested on suspicion of setting fire to a home in Tokyo's Adachi Ward on September 4, injuring an 81-year-old woman, as police investigate whether he was involved in six suspicious fires reported in the area over about two weeks.

MEDIA CHANNELS

MORE Sci-Tech NEWS

Japan Moves to Commercializing Low-Power Optical Computing

Japanese companies are moving closer to commercializing photonics-electronics convergence technology that replaces part of conventional electrical data transmission with optical signals, potentially allowing huge volumes of data to move with lower latency while sharply reducing power consumption as artificial intelligence drives rapid growth in electricity demand from data centers.

Just 27 Centimeters Could Dramatically Reduce Power Consumption

A new generation of optoelectronic integration technology developed over four decades by Japanese companies is moving closer to commercialization, offering a way to transmit huge volumes of data with low latency while sharply reducing the electricity consumed by data centers as artificial intelligence drives explosive growth in computing demand.

CameraJet Connects Cleaning Coaching and Privacy

Dyson CameraJet™ turns the smart toothbrush into an active sensing product, making useful feedback and clear privacy design part of the same engineering brief.

Japanese Researcher Wins Ig Nobel Prize

A late former professor at Asahikawa Medical University has won the Ig Nobel Prize in Medicine for scientifically examining the proper way to blow the nose, extending Japan's streak of Ig Nobel winners to 20 consecutive years.

Tokyo Plans Self-Driving Ride Trial This Year

An autonomous ride-hailing service developed by British company Wayve launched in London on September 3, with the AI-powered technology also scheduled to begin trial operations in Tokyo by the end of 2026.

Deer Population Surges in Southern Alps

A herd of an estimated 200 to 300 deer has been filmed in the Southern Alps, highlighting a rapidly expanding population that experts warn is damaging mountain ecosystems, stripping vegetation, increasing landslide risks and creating problems across Japan ranging from crop losses to traffic accidents.

Eight Kinki Fault Zones Ranked at Highest Alert Level for Major Earthquakes

The Japanese government has revised its assessment of active faults across the Kinki region for the first time in about 20 years, increasing the number of fault zones considered at the highest level of concern for earthquakes of magnitude 6.8 or greater from three to eight.

Osaka Residents Voice Fears Over Massive Data Center

Residents in Minoh, Osaka Prefecture, have asked the city to take a more active role in explaining and reviewing plans for a large data center to be built on the former site of Osaka University's Minoh Campus, citing concerns over low-frequency noise, loss of sunlight and other potential effects on daily life.

< 2 3 4 5 >