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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

Japanese Poll: 76% of Respondents Support Maintaining the "Three Non-Nuclear Principles"

The Tokyo Shimbun, citing a national poll conducted by the Kyodo News-affiliated survey organization from June to July among 3,000 people aged 18 and above, reported that 76% of Japanese support maintaining the Three Non-Nuclear Principles of not manufacturing, not possessing, and not allowing the introduction of nuclear weapons; 77% oppose nuclear-sharing arrangements (i.e., the U.S. stationing nuclear weapons in Japan and operating them jointly). Given that Japan is the only country to have suffered atomic bombing in war, the results highlight strong anti-nuclear sentiment, while debate over whether to revise the principles is intensifying. Support for Japan joining the Treaty on the Prohibition of Nuclear Weapons before the first review conference in November stands at 55%, down 5 percentage points from the previous year; opponents account for 42%, of whom 56% believe that joining would not lead to nuclear disarmament. Regarding recent U.S. actions...

2026-08-03

Nitrogen Supply Unit at Fukushima Daiichi Nuclear Power Station Resumes Operation After Malfunction

Tokyo Electric Power Company (TEPCO) reported on August 1 that a reactor nitrogen supply unit at the Fukushima Daiichi Nuclear Power Station malfunctioned that day, but was subsequently repaired and resumed gas supply. The company stated that during the malfunction, no significant fluctuations were observed in hydrogen concentrations inside the reactors of Units 1 to 3 or in surrounding radiation monitoring data, and no risk of hydrogen explosion was confirmed. The reactor containments and pressure vessels of Units 1 to 3 at the Fukushima Daiichi Nuclear Power Station require continuous nitrogen injection to suppress hydrogen accumulation resulting from radiolysis of water. If hydrogen concentrations exceed a certain level, the risk of hydrogen explosion may increase. According to TEPCO, at 11:14 a.m. on August 1, a worker...

2026-08-03

Japan's Nuclear Regulation Authority Begins Revising Seismic Motion Evaluation Guidelines

In response to the data falsification issue at Chubu Electric Power's Hamaoka Nuclear Power Plant, Japan's Nuclear Regulation Authority (NRA) has initiated the revision of seismic motion evaluation guidelines. The falsification involves seismic motion evaluation data that underpins the safety of nuclear power plants, carrying significant implications. The NRA has stated it will treat this matter with utmost seriousness, aiming to establish stricter standards and monitoring systems through the guideline revision. Chubu Electric Power's data tampering is a grave issue that undermines public trust in nuclear power plant safety. Seismic motion evaluation is an extremely critical element in assessing the seismic resistance of nuclear power plants, and data accuracy is fundamental to safety. This incident has called into question the safety of the Hamaoka Nuclear Power Plant, necessitating a thorough investigation and re-evaluation by regulatory authorities. In the revision work...

2026-08-01

Japan's Nuclear Plant Renewal Faces Labor Shortage Challenges

Japan is planning to replace its aging nuclear reactors to enhance the nation's energy independence. However, the key issue is that labor shortages are threatening the progress of this effort. According to reports, up to 70% of related companies have reported difficulties in recruiting personnel, placing greater strain on an already tight schedule. The government has approved plans to build up to five new nuclear reactors by 2040, but the human resource bottleneck at the operational level is becoming an increasingly serious problem. The labor shortage not only affects the progress of new projects but also puts pressure on the safe operation and maintenance of existing nuclear power plants. As aging reactors are gradually...

2026-08-02

Japan's Chugoku Electric Power swings to loss in FY2026 Q1 as nuclear shutdown raises costs

Japan's Chugoku Electric Power Co. announced its consolidated financial results for the first quarter (April-June) of fiscal year 2026 on July 31. During the reporting period, the company's sales increased 4.4% year-on-year to 343.9 billion yen, up 14.3 billion yen from the same period last year, mainly driven by growth in electricity sales volume. Profit performance, however, came under significant pressure. The company posted an operating loss of 5.3 billion yen, an ordinary loss of 3.2 billion yen, and a net loss of 3.7 billion yen for the first quarter, compared with a net profit of 26.8 billion yen in the same period last year, a year-on-year decrease of 30.5 billion yen. This marks the first time since the first quarter of fiscal year 2022 that the company has recorded simultaneous losses in operating profit, ordinary profit, and net profit over a four-year period. The company stated...

2026-08-02

Japan aims to rebuild up to 5 retired nuclear power plants by the 2040s

The Japanese government held a ministerial meeting on nuclear power on July 31 and decided to rebuild up to 5 retired nuclear power plants by the 2040s. This is the first time since the Fukushima Daiichi nuclear accident that the Japanese government has set a specific numerical target for nuclear plant reconstruction. Kansai Electric Power Company's Mihama Nuclear Power Plant Japanese Prime Minister Takaichi Sanae stated at the meeting that to steadily advance nuclear power investment, the Takaichi cabinet will continue to promote nuclear energy policy. According to the direction set at the meeting, Japan plans to rebuild 2 to 5 nuclear power plants by the 2040s, with a total installed capacity of approximately 2.2 million to 5.5 million kilowatts; by the 2050s, the reconstruction scale will expand to 11 to 14 plants, with a total installed capacity of approximately 12.7 million to 16 million kilowatts. The Japanese government plans to...

2026-08-01

Japan's Fukushima Daiichi Nuclear Power Station launches 22nd release of radioactive wastewater into the ocean, approximately 7,800 tons this time

On the morning of July 30, 2026, Tokyo Electric Power Company (TEPCO) initiated a new round of nuclear-contaminated water discharge into the ocean at the Fukushima Daiichi Nuclear Power Station. This marks the 4th release within 2026 and the 22nd since the discharge plan began in August 2023. According to data released by TEPCO, this discharge is expected to continue until the 17th of next month, with a total volume of approximately 7,800 tons. The total amount of radioactive substance tritium contained therein is as high as approximately 1.3 trillion becquerels. Prior to this, Japan had conducted a total of 21 rounds of radioactive wastewater discharge by the 24th of this month, with a cumulative discharge volume reaching approximately 165,000 tons. This action continues to draw attention and concern from neighboring countries and the international community. This time...

2026-07-31

QST completes first gyrotron 170 GHz microwave output test at ITER site

The National Institutes for Quantum Science and Technology (QST) of Japan announced on July 31 that it has completed the integration and operational testing of the first gyrotron system at the International Thermonuclear Experimental Reactor (ITER) site in southern France, successfully producing 170 GHz microwave output. This system is used for ITER plasma generation and heating, and is one of the key devices for ITER's plan to commence operations in 2034. The core equipment of this test is the gyrotron, a high-power microwave source. Gyrotron operation requires the coordinated work of peripheral equipment such as power supplies, superconducting coils, and cooling systems. QST previously completed performance testing of eight ITER gyrotron systems at the gyrotron test facility of the Naka Fusion Institute in Japan, and transported components including gyrotrons, superconducting coils, and quasi-optical matching units to the ITER site. Over the past three years, QST has advanced system installation, commissioning, and operational preparation at the site.

2026-07-31

Japan Atomic Industrial Forum Chairman: Overseas SMR Projects Help Sustain Supply Chain, but Japan Still Needs to Build New Nuclear Plants

Hideki Masui, Chairman of the Japan Atomic Industrial Forum (JAIF), stated on May 31 that Japanese companies are playing a significant role in global small modular reactor (SMR) projects through design and equipment supply, but the long-term maintenance and development of Japan's nuclear technology base ultimately requires the construction of new nuclear power plants domestically. At a regular press conference, Masui reviewed international developments in the SMR field. He noted that approximately 30 countries currently use nuclear energy, and about 20 countries are studying the deployment of SMRs in some form. Projects involving Japanese companies include GE Vernova Hitachi Nuclear Energy's BWRX-300 and NuScale Power's VOYGR SMR, whi...

2026-06-06

Masayoshi Son: Nuclear Fusion Could Become Key to Powering Future AI Data Centers

SoftBank Group founder Masayoshi Son said at the SoftBank World annual event in Tokyo on July 14 that as electricity demand from AI data centers continues to rise, nuclear fusion technology is expected to become one of the most realistic power solutions in the near future. Son believes that most of the current electricity demand from data centers will still be met by natural gas, but this landscape could change over the next 15 years. He predicted that by 2040, global data center capacity demand will reach 3 terawatts, with nuclear fusion playing a significant role. He said at the event that fusion will become a major source of a cheaper, cleaner, and safer new form of energy on Earth, and asked rhetorically: Now...

2026-07-15