Investor Presentaiton
Safety discharge of ALPS treated water
"ALPS treated water" is the water purified from contaminated water. The radioactive materials other than
tritium are removed by ALPS to meet the regulatory standards for safety.
After confirming concentrations of the radioactive materials will be far below the regulatory standard other
than tritium, the water will be diluted more than 100 times by sea water.
The total annual amount of tritium released into the sea is less than 22 trillion Bq/year. This is the upper
limit of the tritium discharged from TEPCO's FDNPS before the accident.
On July 22, 2022, the implementation plan for the installation of facilities for discharging ALPS-treated water
into the sea was approved by the regulatory authority as meeting the domestic law and the basic policy of
the GOJ.
Before TEPCO can start the discharge of ALPS treated water, remaining processes, such as NRA's Pre-Service
Inspections to check and confirm the installation status of the discharge facilities, will continue. The
discharge will not start until after these steps are duly taken.
1) Purify / Re-purify
Fukushima Daiichi NPS
ALPS
Storage tanks
2) Dilute
3) Discharge
Sea
Groundwater
81
Fuel
Debris
Contaminated Water
Contaminated Water is
generated when
groundwater touched the
damaged reactors and
debris.
Remove almost all kinds of nuclides other
than tritium to the maximum extent, and
meet the national regulatory standards
set based on the ICRP recommendations
ALPS Treated Water
Dilute more than 100
times to make tritium
to at the most 1/40th
of the national
regulatory standards
(1,500Bq/L)
Subject to the
approval of NRA,
discharge will
be started
(envisaged after
two years)
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