Nuclear regulators from nine countries including Japan, the United States and South Korea gathered Monday in Tokyo for a three-day meeting to discuss their responses to the 2011 nuclear accident at the Fukushima Daiichi power plant.

The International Nuclear Regulators Association meeting, chaired by Shunichi Tanaka, head of Japan's Nuclear Regulation Authority, will be held behind closed doors to enable participants to communicate candidly, according to officials.

On Wednesday, they are scheduled to inspect work to contain the crisis at the plant in Fukushima Prefecture, northeastern Japan, they said.

During the meeting, Tanaka was expected to report on Japan's new nuclear regulations based on lessons learned from the accident triggered by the March 2011 earthquake and tsunami.

The association's meetings are held in rotation among the nine participating countries, which also include Britain, France, Germany, Canada, Spain and Sweden. Japan previously hosted the event in 2004.