Tanks for storing radioactive water are on their way to the crippled nuclear power plant in northeastern Japan where reactor cores melted after the massive March 11 earthquake and tsunami.
Tokyo Electric Power Co, the utility that operates the troubled Fukushima Dai-ichi plant, says two of the 370 tanks were due to arrive on Saturday.
Each of the tanks can store either 100 tons or 120 tons of radioactive water.
The tanks will continue arriving through August, and will store a total of 40,000 tons of radioactive water.
Tepco says the radioactive water leaking from the reactors and pooling across the plant could start overflowing from temporary storage areas on June 20, or possibly sooner if there is heavy rainfall.