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❷ Measurement/Confirmation Facility Conditions

Measurement/Confirmation Facility Conditions

The measurement/confirmation facility is split into three groups of 10 tanks (Total capacity of 10 tanks: Approximately 10,000m3) with each of the groups used on a rotating basis as receiving tanks, measurement/confirmation tanks, and discharge tanks.

  • GroupADischarge completed

  • GroupBDischarge completed

  • GroupCDischarge completed

ALPS treated water measurement results (October 15, 2024) 
⇒Confirmed that discharge criteria have been met.

The concentration of radioactive substances excluding tritium.

The sum of the ratios of the concentration of each radionuclide to the regulatory concentration: 

Regulatory standards
1

Analysis
results

The sum of the ratios of the concentration of each radionuclide to the regulatory concentration:
0.083

The sum of the ratios of the concentration of each radionuclide to the regulatory concentration：1

The concentration of radioactive substances excluding tritium.

The sum of the ratios of the concentration of each radionuclide to the regulatory concentration: 

Regulatory standards
1

*Nuclides that are voluntarily checked to ensure that they are not significantly present were confirmed not to be significantly present for all target nuclides.

Tritium concentration:31×104 Bq/L

Confirmed to be less than 1 million Bq/L

  • ※ALPS treated water with high tritium concentration is to be discharged at a later stage of the discharge period by considering the natural decay of radioactivity over time. This is indicated as the upper limit of 1 million Bq/L in the implementation plan (to be discharged starting from the water with lower tritium concentration)
  • ※Pre-dilution ratio of tritium concentration to the regulatory concentration limit(60,000Bq/L) is 5.17 , but the regulatory standard is met by diluting the tritium with large amount of seawater when discharging into the sea. (When diluted 740 times with seawater, ratio of tritium concentration to the regulatory concentration limit drops to 0.0070)

Measurement results from external agency designated by TEPCO (Kaken)

▶Tritium concentration: three hundred thousand Bq/L

▶The sum of the ratios of the concentration of each radionuclide to the regulatory concentration excluding tritium: 0.082

Click here for more detailed data

Click here for analysis results from third party (Japan Atomic Energy Agency)

❸
Dilution/Discharge Facility Conditions

The sum of the ratios to regulatory concentrations

Japanese laws and regulations stipulate the radioactive concentration limits for each radionuclide (regulatory concentration limits) if radioactive substances are to be discharged into the environment. Since the regulatory concentration limits differ for each radionuclide, when discharging multiple radioactive substances, the ratios to regulatory concentrations are calculated for each radionuclide and the total is referred to as the "sum of the ratios to regulatory concentrations”

※Public notice of Requirements for the Safety of the TEPCO Fukushima Daiichi Nuclear Power Station and the Protection of Specific Nuclear Fuel Material

The Japanese government’s standards for discharging contaminated water into the environment ( regulatory concentration limits)

National laws and regulations※ that stipulate the radioactive concentration limits for each radionuclide if radioactive substances from the Fukushima Daiichi Nuclear Power Station are to be discharged into the environment.

※Public Notification of Requirements for the Safety of the TEPCO Fukushima Daiichi Nuclear Power Station and the Protection of Specific Nuclear Fuel Material

ALPS treated water measurement results (October 19, 2023) 
⇒Confirmed that discharge criteria have been met.

The concentration of radioactive substances excluding tritium.

The sum of the ratios of the concentration of each radionuclide to the regulatory concentration: 0.25

Regulatory standards
1

The sum of the ratios of the concentration of each radionuclide to the regulatory concentration：1

The concentration of radioactive substances excluding tritium.

The sum of the ratios of the concentration of each radionuclide to the regulatory concentration: 0.25

Regulatory standards
1

*Nuclides that are voluntarily checked to ensure that they are not significantly present were confirmed not to be significantly present for all target nuclides.

Tritium concentration:13×104 Bq/L

Confirmed to be less than 1 million Bq/L

Measurement results from external agency designated by TEPCO (Kaken)

▶Tritium concentration: One hundred and thirty thousand Bq/L

▶The sum of the ratios of the concentration of each radionuclide to the regulatory concentration excluding tritium: 0.31

Click here for more detailed data

ALPS treated water measurement results (June 23, 2023) 
⇒Confirmed that discharge criteria have been met.

The concentration of radioactive substances excluding tritium.

The sum of the ratios of the concentration of each radionuclide to the regulatory concentration: 0.25

Regulatory standards
1

The sum of the ratios of the concentration of each radionuclide to the regulatory concentration：1

The concentration of radioactive substances excluding tritium.

The sum of the ratios of the concentration of each radionuclide to the regulatory concentration: 0.25

Regulatory standards
1

*Nuclides that are voluntarily checked to ensure that they are not significantly present were confirmed not to be significantly present for all target nuclides.

Tritium concentration:13×104 Bq/L

Confirmed to be less than 1 million Bq/L

Measurement results from external agency designated by TEPCO (Kaken)

▶Tritium concentration: One hundred and forty thousand Bq/L

▶The sum of the ratios of the concentration of each radionuclide to the regulatory concentration excluding tritium: 0.28

Click here for more detailed data

ALPS treated water measurement results (June 23, 2023) 
⇒Confirmed that discharge criteria have been met.

The concentration of radioactive substances excluding tritium.

The sum of the ratios of the concentration of each radionuclide to the regulatory concentration: 0.25

Regulatory standards
1

The sum of the ratios of the concentration of each radionuclide to the regulatory concentration：1

The concentration of radioactive substances excluding tritium.

The sum of the ratios of the concentration of each radionuclide to the regulatory concentration: 0.25

Regulatory standards
1

*Nuclides that are voluntarily checked to ensure that they are not significantly present were confirmed not to be significantly present for all target nuclides.

Tritium concentration:13×104 Bq/L

Confirmed to be less than 1 million Bq/L

Measurement results from external agency designated by TEPCO (Kaken)

▶Tritium concentration: One hundred and forty thousand Bq/L

▶The sum of the ratios of the concentration of each radionuclide to the regulatory concentration excluding tritium: 0.28

Click here for more detailed data