The situation of Japan's Fukushima No.1 nuclear power plant remains "very serious," but there has been "no significant worsening" over the past 24 hours, said the International Atomic Energy Agency (IAEA) on Friday.

"The situation at the reactors at units 1, 2 and 3 appears to remain fairly stable," said Graham Andrew, a senior IAEA official.

He said efforts are being made to restore power to the whole site, and diesel generators are providing power for cooling for both units 5 and 6, which is a "positive" development.

Regarding radiation monitoring, Answer said regular radiation information is being received from 14 Japanese cities, and dose rate in Tokyo and other cities remain far below from the level of requiring an action, which means there is no danger to human health.

IAEA experts sent to Japan have began radiation monitoring work in Tokyo, and they hope to move to the region of Fukushima, where the quake-crippled nuclear plant are located, as soon as possible.

He also announced IAEA chief Yukiya Amano plans to convene a meeting of the 35-nation IAEA board of governors on Monday at the agency's Vienna headquarter.

Amano, who is visiting Japan, has urged Japan to provide more information on "extremely serious" crisis, and stressed the importance of its working closely with the international community to resolve the crisis.