Radioactive water is leaking into the sea from a 20-centimetre (8-inch) crack in a containment pit at Japan's quake-hit Fukushima nuclear plant, its operator Tepco has said.
The crack under reactor 2 may be the source of recent radiation in coastal waters, Tepco officials said.
Tepco is preparing to pour concrete into the pit to try to stop the leak.
Japanese PM Naoto Kan has been visiting the area of north-eastern Japan worst affected by last month's tsunami.
Hidehiko Nishiyama, deputy director-general of the Nuclear and Industrial Safety Agency, told a news conference Tepco was planning to pour concrete into the pit to seal the crack.
"With radiation levels rising in the seawater near the plant, we have been trying to confirm the reason why, and in that context, this could be one source," Mr Nishiyama said.
"There could be other similar cracks in the area, and we must find them as quickly as possible."
Tepco (Tokyo Electric Power Co) had earlier said it suspected radioactive material was escaping continuously from the plant, but they had not until now found the leak.
BBC News - Radioactive water from Japan nuclear plant leaks in sea
The crack under reactor 2 may be the source of recent radiation in coastal waters, Tepco officials said.
Tepco is preparing to pour concrete into the pit to try to stop the leak.
Japanese PM Naoto Kan has been visiting the area of north-eastern Japan worst affected by last month's tsunami.
Hidehiko Nishiyama, deputy director-general of the Nuclear and Industrial Safety Agency, told a news conference Tepco was planning to pour concrete into the pit to seal the crack.
"With radiation levels rising in the seawater near the plant, we have been trying to confirm the reason why, and in that context, this could be one source," Mr Nishiyama said.
"There could be other similar cracks in the area, and we must find them as quickly as possible."
Tepco (Tokyo Electric Power Co) had earlier said it suspected radioactive material was escaping continuously from the plant, but they had not until now found the leak.
BBC News - Radioactive water from Japan nuclear plant leaks in sea
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