Yukio Edano, Japanese Chief Cabinet Secretary, said, "The prefecture is now making a list of evacuees and the national government, in coordination with local officials, will set up centers for medical services. So, for those people who are anxious, we will be screening their radiation level."

Meanwhile, Japan's nuclear safety agency reported that there was no problem with the cooling process at a nuclear power plant in the town of Onagawa.

Earlier, the IAEA said that Japanese authorities had notified its delegates of a rise of radiation levels at the plant.

The Japanese agency now says a rise in radiation at the Onagawa facility is due to leakage from the Fukushima Da-ichi nuclear plant.

It denies major problems with the cooling systems of all three reactors there.