Chubu Electric Power Scraps Hamaoka Restart After Data Fraud

Chubu Electric Power has confirmed that the head of the company will resign following a scandal involving the manipulation of earthquake data. The firm, which operates the Hamaoka nuclear plant in central Japan, is expected to abandon its plans to restart two reactors as a direct result of the misconduct. This decision marks a significant reversal in Japan's efforts to revive nuclear energy, a sector that has been largely dormant since the 2011 Fukushima disaster.

The resignation of President Kingo Hayashi and Chairman Satoru Katsuno follows reports from local media on Monday. An independent panel report released on the same day indicated that management pressure regarding delays in the safety review process contributed to the staff's decision to submit inaccurate data. Chubu Electric Power is scheduled to hold a press conference to address the developments, though the company had not immediately responded to requests for comment prior to the announcement.

Data tampering triggers regulatory suspension

The core of the issue lies in the submission of seismic data that underestimated earthquake risks to the Nuclear Regulation Authority. In January, the operator acknowledged that the data provided to regulators was flawed. The estimate of maximum seismic ground motion is a critical parameter for designing earthquake-resistant nuclear facilities. Chubu had previously estimated this value at 1,200 gal, a unit of acceleration used to measure quake intensity.

The Nuclear Regulation Authority approved this estimate in September 2023. However, the review process was suspended in late December after the authority received information about possible data fraud from a whistleblower in February of the previous year. The suspension effectively halted the progress toward restarting the reactors, which had been undergoing safety checks for several years. The company is now reportedly withdrawing its application for the review process entirely.

Strategic shift in energy policy

Japan has been moving to revive nuclear power to reduce its heavy dependence on fossil fuels and meet growing energy demands. The nation aims to achieve carbon neutrality by 2050 and address the increasing power consumption driven by artificial intelligence. The Hamaoka plant, located in Omaezaki, Shizuoka prefecture, is situated near a seismic fault line known as the Nankai Trough.

This region is at risk of a potential megaquake, as highlighted by the Japan Meteorological Agency's issuance of a special advisory in 2024. The withdrawal of the restart application for Hamaoka represents a setback for the utility sector, particularly as other large-scale projects, such as the Kashiwazaki-Kariwa plant, have recently resumed operations. The incident underscores the strict regulatory environment governing nuclear safety in Japan.

Management accountability and internal pressure

A 250-page report by an independent panel stated that the management's reprimand over delays in the restart review created significant pressure on staff. The panel identified this pressure as one of the factors contributing to the misconduct. The findings suggest that the desire to meet operational timelines may have overridden rigorous data verification processes within the company.

The resignation of top executives is a move to restore confidence in the company's governance and compliance standards. By abandoning the restart plans, Chubu Electric Power is prioritizing regulatory compliance over immediate energy output. This decision aligns with the broader narrative in the energy sector where safety and transparency are paramount, especially in the context of Japan's resource-poor economy and its reliance on imported fossil fuels.