The operator of the Fukushima Daiichi nuclear power plant says tsunami waves reached the coastline next to the plant on Tuesday morning, but have caused no problem so far.
A magnitude 7.4 earthquake struck off the coast of Fukushima Prefecture, triggering tsunami.
Tokyo Electric Power Company told the prefectural government that a tsunami as high as 1 meter was observed at 6:34AM.
The utility said there has been no change in radiation levels at the site. It says workers are patrolling the reactor buildings and the embankment area to monitor the situation.