China protested and blocked imports of Japanese seafood, which has hit Japanese seafood exporters
The IAEA team will take samples from the plant, coastal waters and a fish market in nearby Iwaki city. It will also visit to a national laboratory near Tokyo and meet with Japanese officials.
In late September, Japan and China announced a deal that would ease China's seafood ban and include Beijing in the monitoring of the wastewater discharges under the framework of the IAEA.
The latest IAEA mission, which included experts from China, is not related to the China-Japan deal, officials said.
Japan says the discharge meets international safety standards and is being monitored by the IAEA. Japan has criticized China over its seafood ban as unscientific and demanded an immediate end to the measure.