Things you should know more about decommissioning

What is "contaminated water"? What is "treated water"?

  • Contaminated water measures


“Contaminated water” refers to water generated during the Fukushima Daiichi NPS Accident that contains high concentrations of radioactive substances. Water being used to cool fuel debris, which is fuel that has melted and solidified, becomes contaminated water that contains radioactive substances when it comes in contact with this fuel debris. Furthermore, groundwater and rainwater that seeps into the reactor buildings and turbine buildings mixes with this contaminated water thereby generating more new contaminated water.
“Treated water” refers to water that has been purified using multiple pieces of equipment to reduce the concentrations of radioactive substances thereby reducing risks, after which it is stored in tanks on site.

Click here for details

Treated Water Portal Site

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