Since the serious accident at the Fukushima Daiichi nuclear power plant in March 2011, large quantities of highly contaminated water have been generated every day as a result of the use of water to cool down the core of the meltdown reactor and the flow of rainwater and groundwater, etc. In April 2011, the operator of the plant, Tokyo Electric Power Company (TEPCO), intentionally discharged the contaminated water into the sea, which aroused a great deal of concern and worry in the community. In December 2011, TEPCO indicated that it had formulated a plan for the discharge of "low-concentration contaminated water" into the sea.
