One of two ships that will transport a load of controversial plutonium-uranium mixed oxide fuel back to Britain arrived Friday at a port used by a nuclear reactor in Takahama, Fukui Prefecture.

The Pacific Pintail will transport the MOX fuel, currently stored at Kansai Electric Power Co.'s Takahama nuclear plant, back to British Nuclear Fuels PLC (BNFL), the U.K. firm that manufactured it, in early July, sources familiar with the shipping plan said.

The other ship, the Pacific Teal, has not yet arrived.

In the morning, two cylindrical casks, each about 2.4 meters in diameter and 6.4 meters long, were offloaded from the vessel and transported to a building near the No. 4 reactor at the Takahama plant on trailers.