The alarm sounded while workers were handling the control rods—equipment used to regulate the nuclear reaction—leading to a pause in operations as officials investigate what triggered the alert.
Japan’s Nuclear Regulation Authority, as cited by the Japan Times , said the reactor remains stable and there are no safety concerns, and no abnormal radiation levels have been detected around the world’s largest nuclear power station by capacity.
The No. 6 unit was restarted on Wednesday, marking the first time Tepco has brought a reactor back online since the 2011 Fukushima disaster. Work has now stopped again so engineers can fully understand the cause of the alarm before moving ahead.
