The amount of radioactive materials released from the Fukushima No. 1 nuclear power plant has risen this month compared with December, Tepco said.
The amount so far has come to 70 million becquerels per hour, compared with 60 million becquerels in December, Tokyo Electric Power Co. said Monday, adding that the increase is attributable to the displacement of radioactive materials that had settled on facilities and equipment as a result of work conducted near reactors 2 and 3.
Tepco has recently probed the inside of the container vessel for the No. 2 reactor with an industrial endoscope and conducted scrap work around reactor 3.
While the amount of radioactive materials released from reactor 1 decreased to one-fifth the level in December, the amount of materials from the other two each increased by 10 million becquerels per hour, Tepco said.