NHK, Sept. 6, 2013: The NRA (Nuclear Regulation Authority) says [...] that water contamination has not spread outside the port for the plant.
NHK, Sept. 6, 2013: Chief Cabinet Secretary Yoshihide Suga [...] ruled out any effects on the sea of tainted water leaked from the damaged Fukushima nuclear plant. He said the leakage only affects waters in the port at the plant. (Watch Suga’s speech here)
Kyodo News, Sept. 6, 2013: The president of Tokyo Electric Power Co. has stressed that radioactive water which leaked from a storage tank at the damaged Fukushima nuclear power plant has not reached the ocean waters beyond the port of the seaside plant. “Judging from the results of our monitoring 3 kilometers offshore, there has been no impact on the waters or the wider ocean,” TEPCO President Naomi Hirose said in the message posted on the company’s English website Thursday afternoon. “We believe that the impact on the surrounding waters is limited to the area within the port of the power plant,” he said. [...]
Video of Tepco President Naomi Hirose (At 1:00 in): “We believe that the impact on the surrounding waters is limited to the area within the port of the power plant, and that judging by the result of monitoring three kilometers offshore, there has been no impact on the water or the wider ocean.”
However, several months ago Professor Jota Kanda (Vice Dean at the Graduate/Undergraduate Faculty of Marine Sciences, Tokyo University of Marine Science and Technology) calculated the exchange rate of water from the harbor/port at Fukushima Daiichi into Pacific Ocean. Every day, nearly half (0.44 or 44%) of the water inside the harbor is exchanged with ocean water from outside the harbor:
Published: September 6th, 2013 at 6:05 pm ET