Tokyo Electric Power Co. said it restarted on Tuesday its water decontamination system to cool three reactors at the Fukushima No.1 nuclear power complex after replacing parts of a leaking hose joint.
The system’s “circulating injection cooling” operation, which stopped Monday shortly after it commenced due to a water leak, is a key step to achieving both the stable cooling of reactors and the reduction of highly radioactive water that is accumulating inside the plant’s premises.
Tepco said it found the source of the leak in a joint connecting hoses that carry water cleansed of radioactive materials as well as oil and salt runs from a storage tank to reactors.
It replaced parts in the hose joint, enabling the resumption of the operation for the reactors at 2:36 p.m., Tepco said.
About 1 ton of water containing 3.8 becquerels of radioactive substances per cubic centimeter is believed to have leaked due to the problem.