Tokamak Energy's ST40 device new gyrotron completes site acceptance test
Tokamak Energy disclosed on July 29 that the new gyrotron planned for its high-field spherical tokamak device ST40 has completed site acceptance testing. The equipment, which will serve as the core component of the radio frequency heating system, has undergone key performance verification before installation on ST40. During this test, the gyrotron achieved stable 1 MW power operation at both 104 GHz and 137 GHz frequencies, with pulse lengths up to 2 seconds. The test content included repeatability, modulation capability, power control, and mode purity, and the results demonstrated that the equipment can meet the requirements for sustained performance output in relevant fusion experiments. The gyrotron was built by Kyoto Fusioneering...
2026-07-30
Third fuel debris retrieval test at Fukushima Daiichi Unit 2 postponed due to robotic arm malfunction
The robot used by Tokyo Electric Power Company (TEPCO) for the third experimental fuel debris retrieval at Fukushima Daiichi Nuclear Power Station Unit 2 malfunctioned during an on-site operational test, forcing the cancellation of the plan originally scheduled to start after July 2026 if all went well. The company stated it will reassess the relevant procedures. The malfunction occurred in part of the large robotic arm equipment used to collect fuel debris. During an operational test in the reactor building of Unit 2, TEPCO found an abnormality in one of the motors driving the robotic arm, causing the brake to fail to release and the arm to be unable to extend. The company is currently studying the replacement of the faulty motor. The third experimental retrieval plan was to use a large robotic arm...
2026-07-31
Restart of Tomari Nuclear Power Plant Unit 3 Delayed to After End of 2027
Hokkaido Electric Power Co. announced on July 30 that the restart of Unit 3 at the Tomari Nuclear Power Plant will be significantly delayed compared to earlier expectations, with the earliest possible date being the end of 2027 or later. Previously, the company had set a target of restarting as early as possible within 2027, but due to delays in the seawall construction project and the fact that the Nuclear Regulation Authority (NRA) has not yet completed its review of the relevant design and construction plans, the timeline for the unit's return to operation remains uncertain. Hokkaido Electric Power President Susumu Saito stated at a press conference that the seawall at the Tomari plant was originally scheduled for completion in the spring of 2027, but is now expected to be finished by mid-August 2027 due to additional work such as seismic reinforcement of the wharf and liquefaction countermeasures...
2026-07-31
Japan's Chief Cabinet Secretary Meets ITER Organization Director-General
Starting at 4:50 p.m. on July 29, Japan's Chief Cabinet Secretary Yoshimasa Hayashi met with Pietro Barabaschi, Director-General of the International Thermonuclear Experimental Reactor (ITER) Organization, who was visiting Japan. The meeting lasted approximately 15 minutes. (Photo source: Japan Cabinet Public Affairs Office) Hayashi welcomed Barabaschi's visit to Japan. He stated that fusion energy has been listed as one of the 17 strategic areas in Japan's growth strategy. Japan looks forward to progress in the ITER project and believes it will play a significant role in advancing the realization of fusion energy and enhancing energy security. Hayashi...
2026-07-30
Japan Nuclear Fuel Company Says It Will Propose New Schedule for Rokkasho Reprocessing Plant as Soon as Possible
Naohiro Masuda, President of Japan Nuclear Fuel Company (JNFL), stated at a regular press conference on July 29 that the spent nuclear fuel reprocessing plant in Rokkasho Village, Aomori Prefecture, may be difficult to complete within the current fiscal year. The company will propose a new overall schedule as soon as possible after continuing consultations with regulatory authorities on the treatment of liquid waste within the facility. Masuda said that earlier this month, when an official from the Agency for Natural Resources and Energy of the Ministry of Economy, Trade and Industry met with Aomori Governor Soichiro Miyashita, Miyashita had informed the official that completing construction of the reprocessing plant within the current fiscal year would be challenging. Masuda stated that the company needs to make every effort to avoid the risk of schedule delays becoming a reality, and will manage the project construction progress from multiple aspects...
2026-07-30
Japan's Nuclear Regulation Authority to Revise Seismic Review Guidelines for Nuclear Power Plants
Following the exposure of Chubu Electric Power Co., Inc.'s alleged tampering with data related to earthquake assumptions at the Hamaoka Nuclear Power Plant in Shizuoka Prefecture, Japan's Nuclear Regulation Authority (NRA) has decided to revise certain seismic review guidelines for nuclear power plants to strengthen prevention of similar misconduct. At a regular meeting held on July 29, the NRA decided to proceed with revisions to the guidelines concerning seismic assumption reviews. Previously, the review process primarily focused on the calculation results submitted by nuclear power plant operators. The revision will extend the scope of verification to include the calculation process and the data used therein, in order to prevent companies from intentionally selecting, adjusting, or manipulating data.
2026-07-30
Japan's Ikata Nuclear Power Plant Unit 1 Decommissioning Plan to Enter Second Phase
The Environmental Safety Management Committee for the Ikata Nuclear Power Plant, established by the Ehime Prefectural Government, recently held a meeting to review the progress of the decommissioning plan for Unit 1 of the Ikata Nuclear Power Plant. The unit ceased operation in 2016 and is currently in the decommissioning implementation phase. Unit 1 of the Ikata Nuclear Power Plant is operated by Shikoku Electric Power Co. The company began decommissioning the unit in 2017, planning to carry out the work in four phases over a total period of approximately 40 years. Currently, the first phase has been largely completed, primarily involving the removal of nuclear fuel. Shikoku Electric Power Co. has applied to the Japanese central government to enter the second phase, which involves dismantling equipment around the reactor area, and has...
2026-07-30
TEPCO says cooling interruption of spent fuel pool at Fukushima Daini Unit 1 due to human error
Tokyo Electric Power Company (TEPCO) announced on July 29 that the event in April 2026, where the spent fuel pool cooling system at Unit 1 of the Fukushima Daini Nuclear Power Plant was shut down for approximately 32 hours, was determined to be caused by human error. At the time of the incident, the plant was in the decommissioning phase. On April 5, a fault alarm was triggered by the cooling water circulation pump of Unit 1 at Fukushima Daini. After on-site personnel confirmed smoke from the equipment, the pump was stopped, resulting in an interruption of the spent fuel pool cooling system for about 32 hours. TEPCO previously stated that the cause was damage to the cable connecting the pump motor. According to TEPCO's latest explanation, the cable melting may be related to the installation method when the cable was replaced in 2012...
2026-07-30
Chugoku Electric Power Submits Third Amendment to Reactor Installation Change Permit Application for Shimane Nuclear Power Plant Unit 3 to Regulatory Authority
Chugoku Electric Power Co., Inc. announced on July 29 that it had submitted the third amendment to the reactor installation change permit application for Unit 3 of the Shimane Nuclear Power Plant to the Nuclear Regulation Authority (NRA) on the same day. The company stated that this amendment adjusts the application content for related equipment at the plant based on previous review findings. This includes reclassifying certain equipment already installed for Unit 2, such as the emergency response center, for shared use between Unit 2 and Unit 3. According to reports, Chugoku Electric Power had previously submitted two amendments to the reactor installation change permit application for Unit 3 of the Shimane Nuclear Power Plant, on December 22, 2021, and June 29, 2022, respectively.
2026-07-29
A member of Japan's Nuclear Regulation Authority inspects safety management at the Takahama Nuclear Power Plant.
Tomoyuki Sugiyama, a commissioner of Japan's Nuclear Regulation Authority (NRA), recently visited Kansai Electric Power Co.'s Takahama Nuclear Power Plant to inspect safety management measures, the execution of routine inspections, and pre
2026-07-27
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
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
Reading Ranking
- 1 Chugoku Electric Power Submits Third Amendment to Reactor Installation Change Permit Application for Shimane Nuclear Power Plant Unit 3 to Regulatory Authority
- 2 A member of Japan's Nuclear Regulation Authority inspects safety management at the Takahama Nuclear Power Plant.
- 3 TEPCO says cooling interruption of spent fuel pool at Fukushima Daini Unit 1 due to human error
- 4 Japan's Nuclear Regulation Authority to Revise Seismic Review Guidelines for Nuclear Power Plants
- 5 Japan Nuclear Fuel Company Says It Will Propose New Schedule for Rokkasho Reprocessing Plant as Soon as Possible
- 6 Japan's Chief Cabinet Secretary Meets ITER Organization Director-General
- 7 Tokamak Energy's ST40 device new gyrotron completes site acceptance test
- 8 Restart of Tomari Nuclear Power Plant Unit 3 Delayed to After End of 2027
- 9 Third fuel debris retrieval test at Fukushima Daiichi Unit 2 postponed due to robotic arm malfunction
- 10 Masayoshi Son: Nuclear Fusion Could Become Key to Powering Future AI Data Centers
- 11 Japan Atomic Industrial Forum Chairman: Overseas SMR Projects Help Sustain Supply Chain, but Japan Still Needs to Build New Nuclear Plants
- 12 Japan's Ikata Nuclear Power Plant Unit 1 Decommissioning Plan to Enter Second Phase