# Chubu Electric Hamaoka plant misconduct scandal

> Live situation record from CLSTR: https://clstr.news/situations/chubu-electric-hamaoka-plant-misconduct-scandal
> Updated: 2026-09-13T06:48:00.000Z. Sources: 10. Developments: 2.

Chubu Electric Power has faced multiple allegations of data falsification and financial misconduct regarding the Hamaoka Nuclear Power Plant. Initially, the company admitted to improper procedures involving the decommissioning of Units 1 and 2. Investigations revealed that reports provided to the Nuclear Reprocessing and Decommissioning Facilitation Organization (NuRO) were altered to make construction progress appear “in line with the plan,” including the manipulation of figures such as the weight of dismantled equipment.

The scandal expanded to include the falsification of seismic design data used to seek regulatory approval for restarting Units 3 and 4. This misconduct, which allegedly dates back to 2012, led the company to withdraw its safety review applications. 

As a result of these compounded regulatory and reputational challenges, including separate issues regarding customer overcharging, Chubu Electric’s top leadership—President Kingo Hayashi and Chairman Satoru Katsuno—announced their intention to resign. The Nuclear Regulation Authority has suspended safety reviews for the affected reactors while investigations continue.

## Claims

- Chubu Electric Power received an investigation committee report regarding data misconduct. (corroborated by 3 sources)
- Chairman Satoru Katsuno intends to resign. (corroborated by 3 sources)
- The data fraud involved seismic design data at the Hamaoka nuclear plant. (corroborated by 3 sources)
- President Kingo Hayashi intends to resign. (corroborated by 2 sources)
- The company withdrew its safety review application for Hamaoka Units 3 and 4. (single source)
- The company overcharged customers by approximately 1.2 billion yen across 5 million contracts. (single source)

## Timeline

### 2026-09-13: Chubu Electric leadership to resign over Hamaoka nuclear data fraud

Chubu Electric Power's President and Chairman intend to resign following a scandal involving falsified seismic data at the Hamaoka nuclear plant and other billing irregularities.

8 sources. https://clstr.news/cluster/chubu-electric-leadership-to-resign-over-hamaoka-nuclear-data-fraud

### 2026-08-26: Chubu Electric Power admits to falsifying Hamaoka plant decommissioning costs

Chubu Electric Power admitted to falsifying decommissioning progress reports and cost claims for Hamaoka Nuclear Power Plant units 1 and 2 to make work appear more advanced than actual results.

6 sources. https://clstr.news/cluster/chubu-electric-power-admits-to-improper-hamaoka-plant-decommissioning-billing

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Cite as: Chubu Electric Hamaoka plant misconduct scandal. CLSTR, https://clstr.news/situations/chubu-electric-hamaoka-plant-misconduct-scandal