TEPCO to Postpone Restart of Kashiwazaki-Kariwa N-plant Over Safety Concerns Due to Failure of Control Rod Alarm System

The Yomiuri Shimbun

13:03 JST, January 19, 2026

Tokyo Electric Power Company Holdings Inc. announced Monday that it decided to postpone the restart of the No. 6 reactor of its Kashiwazaki-Kariwa nuclear power station in Niigata Prefecture. The restart was originally scheduled for Tuesday.

The alarm system for the control rods, which are used to suppress the nuclear fission reaction, failed to sound during its test trial on Saturday. TEPCO intends to make sure if it is safe to operate the reactor.