Separately, Tokyo Electric Power said it was inspecting the nuclear plant for damage from the heavy rains.
In the city of Tamura, floodwaters displaced huge bags containing contaminated waste gathered during the cleanup of areas around the Fukushima Daiichi nuclear plant, Kyodo News reported. A river washed away an unknown number of the bags, which were in a temporary storage area, it said.
The contents of the bags, which hold up to 1.3 tons, were unclear, but they are most likely filled with irradiated topsoil and other refuse from the cleanup that followed the meltdown. Ten of the bags were recovered undamaged, Kyodo News said, and the authorities are cataloging the remaining ones to see how many were still missing.