Japanese Kyodo news on Saturday quoted official sources as confirming that contaminated water is seeping from reactor 2 into sea.

According to Kyodo, effort is ready to stop tainted water from leaking from reactor 2 in Fukushima No. 1 nuclear power plant, located around 220 km from Tokyo. The authority also is checking if tainted water from other reactors is seeping into sea.

Meanwhile, efforts to remove radioactive water from inside the buildings continued Saturday.

According to Kyodo news, Tokyo Electric Power Co. (TEPCO) is considering using a large artificial floating island, a so-called "megafloat", to store the tainted water.

Removal of contaminated water is necessary to reduce the risk to workers who are trying to restore the cooling functions, which are crucial to overcome the crisis triggered by the March 11 earthquake and ensuing tsunami.

But it remains uncertain when authorities can get the plant under control, Kyodo news reported.