The Duck Curve#nra
NRA details Hamaoka ground-motion 'tuning'; Chubu books ¥370bn loss
Japan's Nuclear Regulation Authority secretariat told the Commission's October 28, 2026 meeting that Chubu Electric arbitrarily set hybrid-synthesis connection periods for Hamaoka and lowered accelerations in the Ss2-D simulated ground motion, and mishandled 2019 and 2021 helpline reports. On October 29 Chubu booked a ¥370.3 billion special loss on its nuclear assets and fuel.
Chubu files Hamaoka 3 and 4 withdrawal; NRA issues no disposition
Chubu Electric Power's request to withdraw six Hamaoka units 3 and 4 applications, dated September 25, 2026 and signed by then-President Kingo Hayashi, and the Nuclear Regulation Authority's letter of the same date saying it will issue no disposition on them were distributed at the NRA commission's September 30, 2026 meeting. Jiji Press, citing the NRA, reports it is the first time a screening application has been withdrawn because of misconduct; the NRA's inspection continues on three matters before a SERP evaluation.
Chubu withdraws Hamaoka 3 and 4 applications after seismic-data inquiry
Chubu Electric Power's board decided on September 14, 2026 to withdraw the new-regulatory-standards applications for Hamaoka units 3 and 4 (1,100 MW and 1,137 MW) after an outside investigation committee reported on how the plant's design basis ground motion was developed. Chairman Satoru Katsuno and President Kingo Hayashi step down September 30; director Minoru Yasui becomes president October 1. The committee says it does not find the acts appropriate but also rejects reducing them to falsification or data fraud.