The incident occurred at 6 : 10 am and is feared to have damaged the reactor 's pressure - suppression system citing a report from the plant 's operator Tokyo Electric Power Co .
The reactor 's pressure - suppression system is the Nuclear and Industrial Safety Agency said .
The incident occurred at 6 : 10 am and is feared to have damaged the reactor 's pressure - suppression system , the Nuclear and Industrial Safety Agency said , citing a report from the plant 's operator Tokyo Electric Power Co .