1341613

❶ALPS Treated Water, etc. Conditions

Amount of ALPS treated water, etc. and Sr removed water stored in tanks

as of July 20, 2023

  • 0

    *Amount of water containing amount between the bottom of a tank and the lower measuring limit of the level gauge

ALPS treated water, etc.

ALPS treated waterApprox. 30%
Water to be re-purifiedApprox. 70%

Sr removed water

tank

Approximately
1.37 million m³

1,333,254m³

8,359m³

98%

At the Fukushima Daiichi Nuclear Power Station, the radioactive substances in contaminated water are removed using a multi-nuclide removal equipment (ALPS) etc., and the resulting
ALPS treated water, etc. and Sr removed water is stored in tanks on site.
1046 storage tanks are being used for ALPS treated water, etc., including 30 tanks for measurement and confirmation. There are 24 storage tanks for Sr removed water. 12 storage tanks are being used for fresh water treated with RO facility and 1 tank is being used for concentrated seawater.

Radioactive Concentration Contains in ALPS treated water, etc.

  • 35%
    (418,700m³)
  • 31%
    (369,700m³)
  • 17%
    (209,600m³)
  • 12%
    (149,600m³)
  • 5%
    (56,700m³)

A L P S t r e a t e d w a t e r

W a t e r t o b e - p u r i f i e d

(As of September 30, 2023)

*Only completely filled tanks (including repurposed tanks) were used to calculate the amount, so this amount may differ from the entire amount of stored water.

Amount of ALPS treated water and water to be re-purified broken down by the sum of the ratios to regulatory concentrations limits (estimate)

  • 〜1time
  • 1time〜5times
  • 5times〜10times
  • 10times〜100times
  • 100times〜19,909times

Repurposed tanks (Water to be re-purified)

87,100m³

  • Sum may not be 100 because storage percentages have been rounded to integers.
  • Breakdown of the amount of water stored in repurposed tanks and estimation of the sum of the ratios to regulatory concentrations are shown in "the amount of water stored in repurposed tanks."

Currently, ALPS treated water, etc. is being stored in tanks after most of the radionuclides have been removed, with the exception of tritium. Multi-nuclide removal equipment is capable of removing radioactive substances (excluding tritium) to the point where the concentrations of these substances are lower than the regulatory concentrations limits set for discharge into the environment, which are part of national regulatory standards pertaining to contaminated water. However, due to equipment malfunctions at the beginning of the facility operation and different operational objectives at the time , the current amount of treated water being stored broken down by the sum of the ratios to regulatory concentrations is as shown in the above diagram.