At the Fukushima Daiichi Nuclear Power Station we are enlisting the cooperation
of a great many people in order to move forward with countermeasures for
contaminated water that was generated in conjunction with the accident and contained
high concentrations of radioactive substances.
Through this portal site we shall explain the current situation and give you
data/information on ALPS treated water, etc. while also showing how we have removed
the radioactive substances from contaminated water and reduced risks.
Note on “Water treated with multi-nuclide removal equipment, etc.” is notated.
(revised in April, 2021)
Water treated with multi-nuclide removal equipment (ALPS) so that the
concentrations of radioactive materials other than tritium sufficiently satisfy
regulatory standards for safety (sum of ratios of legally required concentrations,
excluding tritium, is less than 1) shall be referred to as, “ALPS treated water.”
Water that has been purified with multi-nuclide removal equipment (ALPS), but for
which the concentrations of radioactive materials do not meet regulatory standards
for safety (sum of ratios of legally required concentrations, excluding tritium,
is 1 or higher) shall be referred to as, "Treated water to be re-purified." The
term “ALPS treated water, etc.” shall be used when referring collectively to both
types of water.
*The terms used in past documents shall remain unedited. Hence, the definitions
differ slightly from the terms used after the March 11, 2020 revision of said