An International Atomic Energy Agency investigation team will arrive in Japan next week to probe the nation's nuclear crisis.
The group of some 20 nuclear experts will visit from 24 May to 2 June, Chief Cabinet Secretary Yukio Edano told a news conference.
The IAEA's team is likely to visit the Fukushima Daiichi nuclear power plant.
The plant was crippled by an earthquake and tsunami on 11 March and has leaked high levels of radiation to the environment.
'We have been making an effort to secure transparency as much as possible, and our acceptance of the investigation team is part of it,' Mr Edano said.
'It will be meaningful to share our nation's experience with other countries.'
The team plans to report their findings at a ministerial meeting to be hosted by the agency next month in Vienna, he added.