Katsumata and two co-defendants pleaded not guilty, saying predicting the tsunami was impossible, and were acquitted in the district and high court rulings. The case is now pending at the Supreme Court.

Katsumata also faced a civil trial filed by a group of TEPCO shareholders and was ordered by the Tokyo District Court in 2022 to pay damages exceeding 13 trillion yen ($85 trillion) with three other former executives. The case is pending at Tokyo High Court.