Ambassador Toshiro Ozawa of Japan's diplomatic mission made that pledge on Monday at a regular board meeting of the International Atomic Energy Agency in Vienna. He outlined the government's plan to solve the problem of contaminated water leaking from the plant.
Ozawa said the buildup of radioactive water is the most urgent problem caused by the 2011 nuclear accident. He stressed the government's determination to solve it as soon as possible.
Ozawa told reporters after the meeting that other countries, especially Japan's neighbors, hope Japan will be able to successfully cope with the situation.
The ambassador said those countries want Japan to provide more information.
At the IAEA board meeting, the Japanese mission provided English translations of the government's basic plan to deal with the buildup of radioactive water. The government approved the plan last week.
The mission also plans to hold a briefing at the general meeting of the IAEA next week about the current situation at the Fukushima plant.