Tanks for storing radioactive water are on their way to the crippled nuclear power plant in north eastern Japan where reactor cores melted after the massive 11 March earthquake and tsunami.
Tokyo Electric Power Co, the utility that operates the troubled Fukushima Dai-ichi plant, said two of the 370 tanks were due to arrive today.
Each of the tanks can store either 100t or 120t of radioactive water.
The tanks will continue arriving until August, and will store a total of 40,000t of radioactive water.
Tepco said 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.