Japan’s Ohi Nuclear Plant Wins Permit Appeal, May 28

Japan’s Osaka High Court ruled on May 28 that the Ohi nuclear plant’s operating permit is valid, overturning a lower court decision that had cancelled it. About 120 residents from six prefectures had challenged the permit, claiming the plant’s earthquake safety standards were too low. The high court sided with the government regulator, saying the safety review contained no serious errors.

What the Court Decided

The Osaka High Court ruled that the Nuclear Regulation Authority’s permit for the Ohi plant’s units 3 and 4 was legally sound. Judge Masafumi Kawabata said the regulator’s judgment showed no unreasonable flaws. This reversed a December 2020 lower court decision that had cancelled the permit, marking the first time a post-Fukushima safety review was overturned.

The Core Dispute: Earthquake Estimates

The lawsuit centered on how the plant calculated the maximum expected earthquake shaking, called the “standard seismic motion.” Residents argued the calculation underestimated uncertainty in earthquake data. The high court found that Kansai Electric Power set conservative values for key earthquake parameters, which properly accounted for data uncertainty without needing to add extra safety margins.

What Happens Next

Unit 3 is currently operating. Unit 4 is scheduled to restart in June after routine maintenance. Residents’ lawyers said they are considering an appeal to Japan’s Supreme Court. The Nuclear Regulation Authority said it will continue strict safety reviews based on lessons from the 2011 Fukushima disaster.

Why This Matters for Nuclear Policy

This ruling strengthens the government’s ability to restart nuclear plants under post-Fukushima safety rules. Since 2011, courts have mostly sided with the government in nuclear disputes despite initial resident victories. The decision signals that courts will not overturn regulator permits unless safety flaws are clear and undeniable.

Final Thoughts

The high court’s decision allows the Ohi plant to continue operating and sets a high bar for residents to challenge nuclear permits through courts. Residents plan to pursue an appeal, but the ruling reflects a pattern of courts backing the government on nuclear safety after initial skepticism.

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