Full Breakdown
TEPCO Plans to Restart Reactor After Alarm Incident
2/5/2026, 11:43:18 AM
Overview of the Incident
Tokyo Electric Power Company Holdings Inc. (TEPCO) is preparing to restart the No. 6 reactor at the Kashiwazaki-Kariwa nuclear power plant in Niigata Prefecture, following a suspension triggered by an alarm incident. This reactor was brought back online last month, marking the first restart of a nuclear unit since the 2011 Fukushima disaster. However, operations were halted approximately five hours and 25 minutes after the restart due to an alarm that indicated abnormalities during the withdrawal of control rods.
Technical Issues and Response
The alarm, which went off in the early hours of January 22, 2023, led TEPCO to suspect a setup error as the cause. In response, the company replaced the components believed to be responsible for the alarm. Despite these efforts, the situation did not improve, prompting TEPCO to halt the reactor the following day for further investigation.
Regulatory and Operational Adjustments
TEPCO plans to submit a revised schedule for the reactor's commercial operations to Japan's Nuclear Regulation Authority, with the start date now postponed from the originally planned February 26. The company aims to ensure that all safety protocols are met before proceeding with the restart.
Financial Implications
TEPCO is under significant financial pressure due to ongoing compensation costs and other expenses stemming from the Fukushima disaster. The company views the restart of the Kashiwazaki-Kariwa plant, which is the largest nuclear power station in the world by output when fully operational, as a critical step toward increasing revenues. This financial boost is deemed essential for compensating those affected by the 2011 nuclear accident.
Criticism and Concerns
While TEPCO is optimistic about the restart, there are concerns regarding the safety and reliability of the reactor following the alarm incident. Critics argue that the alarm's occurrence raises questions about the plant's operational integrity and the adequacy of TEPCO's safety measures. The company must address these concerns to regain public trust and ensure compliance with regulatory standards.
What's Next
TEPCO's next steps include finalizing the revised schedule for the reactor's commercial operations and continuing to investigate the alarm incident. The company is expected to provide updates to the Nuclear Regulation Authority and the public as it works toward a safe and successful restart.
