Experts from the International Atomic Energy Agency are in Japan for a final safety assessment of a plan to release treated and diluted water from the troubled Fukushima Daiichi nuclear power plant.

The team of experts from Britain, China, South Korea and elsewhere plans to issue a comprehensive report on its findings in June. The task force has repeatedly conducted inspections since February last year.

The experts started discussions with officials of Japan's industry ministry and Nuclear Regulation Authority on Monday.

The team members are scheduled to visit the Fukushima plant in northeastern Japan during the five-day mission.

They plan to inspect facilities for releasing the water into the sea. They will also assess the regulator's procedures for monitoring the discharge.

The treated water will be diluted to reduce tritium levels before it is released into the ocean. Its tritium concentration will be lowered to one-seventh of the World Health Organization's standards for drinking water.

South Korea sent its own mission to Japan last week on the grounds of domestic concerns.

China and some Pacific Island nations have also expressed concern or criticism of the plan.

Japan's government aims to start releasing the water by around this summer, and hopes the IAEA report will help gain international understanding for the plan.