Amid fears of contamination, Japan will soon dump treated water from Fukushima Nuclear Plant into the Pacific

Fukushima Daiichi Nuclear Power Plant.

Fukushima Daiichi Nuclear Power Plant. Photo Credit: Dean Calma / IAEA. Source: Flickr. (CC BY 2.0)

Pacific island nations, neighboring countries in Asia, scientists, and others criticized an international organization's endorsement of plans to dump tens of thousands of tons of contaminated wastewater from the Fukushima Daiichi nuclear power plant into the ocean. The plan to schedule the discharge of approximately 1.3 million tons of water on an ongoing basis for the next three decades has alarmed the Pacific community because of possible adverse impacts on nearby marine ecosystems and their way of life.

Following a January 2023 visit to the Fukushima nuclear facility to receive updates on plans to dispose of the contaminated water, Gustavo Caruso, a Director within the International Atomic Energy Agency (IAEA) Department of Nuclear Safety and Security and Chair of the Task Force, voiced support for the plans. As an international association, the IAEA says it promotes the “safe, secure and peaceful use of nuclear energy,” which includes the disposal of nuclear waste.

“[Japan's Nuclear Regulation Authority] prepared thorough evidence of how they are aligning the regulatory plans related to […] treated water discharge with the IAEA safety standards,” said Caruso in a statement following the visit. According to the IAEA statement, “Before any water discharge begins – scheduled for this year – the IAEA will issue a comprehensive report containing the collected findings and conclusions of the Task Force across all aspects of the review conducted as of that time.”

In March 2011, an earthquake and tsunami resulted in a nuclear disaster in Fukushima Daiichi nuclear power plant. After power was disrupted and emergency generators failed, three nuclear reactors onsite lost cooling capabilities and experienced a core meltdown.

Water used to cool the reactors, along with groundwater below the complex, became contaminated with radioactive materials. This water has been collected, treated, and stored onsite since 2011 in dozens of massive storage tanks that now crowd the nuclear complex.

Since 2021, the Tokyo Electric Power Company (TEPCO) has been preparing the infrastructure for the “safe” release of Fukushima’s treated water through a process called the Advanced Liquid Processing System (ALPS). In August 2022, TEPCO announced the installation of facilities that will allow for water discharge after consulting with Japanese authorities and local residents. It vowed to cooperate with various stakeholders in explaining the systematic release of water and its scientific basis:

We will continue to do our utmost to increase the understanding of people of Fukushima and society at large regarding the handling of ALPS treated water as part of the decommissioning work, by focusing on our efforts to disseminate information based on scientific evidence to parties within and outside Japan in an easy-to-understand manner and taking every opportunity to listen to the concerns and opinions of the public and explain our approach and response.

But Henry Puna, the secretary general of the Pacific Islands Forum (PIF), reiterated the regional opposition to Japan’s plan of releasing Fukushima’s treated water into the Pacific Ocean:

Based on our experience with nuclear contamination, continuing with ocean discharge plans at this time is simply inconceivable and we do not have the luxury of time to sit around for four decades in order to ‘figure it out.’

The decision for any ocean release is not and should not only be a domestic matter for Japan, but a global and transnational issue that should give rise to the need to examine the issue in the context of obligations under international law.

I am asking today, what our Pacific people did not have the opportunity to ask decades ago when our region and our ocean was identified as a nuclear test field.

PIF enumerated alternative options such as “safe storage and radioactive decay, bioremediation, and use of treated water to make concrete for special applications.”

During a conference held at New Zealand’s University of Otago in November 2022, participants described Japan’s plan as a manifestation of “nuclear colonial violence”:

TEPCO and the Japanese government’s plan to discharge radioactive wastewater into the Pacific shows direct disregard for the sovereignty and self-determination of Pacific peoples and the ocean their livelihoods depend upon.

We condemn attempts by the Japanese government and TEPCO to trivialise the nature and extent of the damages the radioactive wastewater discharge will cause to the people, ocean life, and places of the Pacific.

Speaking on behalf of Pacific civil society groups, Noelene Nabulivou of DIVA for Equality urged Japanese authorities to consider the perspectives of Pacific communities:

Japan’s internal process of approval for this construction needs to consult the Pacific, as it threatens the livelihood of Pacific peoples and the environment we depend heavily on. This is all happening in the context of massive loss and damage from the climate emergency, that is also not of our making.

The Chinese foreign ministry called Japan’s decision to go ahead with its controversial plan “irresponsible” and “self-serving. Meanwhile, the US National Association of Marine Laboratories cited the “lack of adequate and accurate scientific data supporting Japan’s assertion of safety.” Robert Richmond, a marine biologist at the University of Hawaii, Manoa, noted that “there is a strong consensus internationally that continued use of the ocean for dumping waste is simply not sustainable.”

Local opposition to the contaminated water discharge has been supported by Sato Kazuyoshi, a municipal councilor in Iwaki, a city neighboring the Fukushima nuclear complex. In a Facebook post, Sato said:

On January 13, near the entrance to Onahama Port, Iwaki City, we held a rally, ‘Iwaki Citizens Against the Release of Contaminated Water from Nuclear Power Plants into the Ocean.’ The beginning of this year's standing. On earlier that day, there were reports that government ministers had confirmed the release (of contaminated water) ‘from spring to summer.’

Since June 2021, we have been holding a this rally on the 13th of every month: ‘Don't pollute the sea any more!’

At noon, I stood with an illustration banner by Eisaku Ando, a sculptor who moved from Iwaki to Nara, and a placard saying ‘Don't pour contaminated water into the sea!’ Nearly 20 participants from their respective standpoints said that they would not allow contaminated water to be released into the ocean! and impassioned speeches. A Japanese citizen who had returned from Canada for a visit also joined us, showing the international spread of opposition to the ocean release of contaminated water.

TEPCO is working closely with the International Atomic Energy Agency (IAEA), which has been releasing regular reports about the safety procedures being done at Fukushima. IAEA assured the public that it will release its comprehensive report before the actual discharge of treated water in about three months’ time.

Fukushima Nuclear Power Plant

Fukushima Nuclear Power Plant. Photo by Joe Moross. Source: Wikipedia, (CC BY 4.0)


  • Nicholas Geary

    The water processing system has the ability to take all the radioisotopes except for two down to trace or below-detection-threshold levels. Every batch will be tested before release, with multiple independent labs involved in the verification process.
    The two radioisotopes the treatment system will not remove are tritium and carbon 14.

    Tritium released by atomic bomb testing: roughly 650 kilograms (no effect on marine life detected.)
    Bomb tritium still in the Pacific: ~12 kilograms
    Natural tritium in the Pacific: ~3 kilograms
    Amount of Pacific bomb tritium which currently decays away each year: Roughly 650 grams
    Maximum tritium release rate from Fukushima: 0.06 grams per year
    Amount of time it would take for an equivalent amount of Pacific bomb tritium to disappear: 50 minutes

    Global natural inventory of C-14: roughly 50 metric tonnes
    Total C-14 inventory in the tanks at Fukushima: 0.336 grams
    Average C-14 concentration in the Fukushima tanks: 43 Bq per kg
    Typical C-14 concentration in the human body: 44 Bq per kg

    • Thanks for reading the article and leaving a comment. Your back-of-the-napkin math seems to be correct — please be sure to read past GV coverage about this issue where we report on this.

      However, AFAIK neither TEPCO nor NRC have announced firm plans for how contaminated water will be disposed of. Where in the Pacific, exactly?

      On top of that, Pacific island nations’ concerns are still valid. There are many educated specialists from these nations we need to listen to.

      • Nicholas Geary

        “AFAIK neither TEPCO nor NRC have announced firm plans for how contaminated water will be disposed of. Where in the Pacific, exactly?”

        Tepco announced their proposed plan to pipe the water out through an undersea tunnel with a discharge point roughly a kilometer offshore back in Aug. 2021. Shortly after the announcement, they also posted this map of the proposed release point location:

        And that map has also appeared in several of their PDF public reports, such as this one (page 124):

        Some aspects of the release plan are still awaiting approval, but since construction of the tunnel began last August, I suspect that part of the plan is probably pretty firm.

        “On top of that, Pacific island nations’ concerns are still valid.”

        Puna expressed fear that if this plan proceeds unchecked “the region will once again be headed towards a major nuclear contamination disaster”. I can understand his fear and suspicion–given the historical context of the region–but an understandable concern isn’t automatically a valid concern. I could also understand Trump supporters’ concerns that the 2020 election was being stolen from them–given their fears, suspicions, and the confusing information they were seeing. That doesn’t mean their concerns were valid–no matter how sincere and heartfelt they may have been.

        A concern which has an emotional justification is actually less likely to be valid. A valid concern is one which has an articulable and plausible rationale. Fear about a nebulous contamination disaster isn’t enough. What are the specific isotopes of concern? How might they produce a contamination disaster? How likely is this? Is this concern reasonable and proportional? These are things that I would need to see before I could reach a conclusion about whether their concerns are valid.

        “There are many educated specialists from these nations we need to listen to.”

        I’ll listen to anyone, but the credentials, or the nationality, or the race, or the gender of the person posing an argument is immaterial to the merits of the argument. What I’m looking for is whether the position has sound reasoning and objective support that I can verify for myself.

  • Mi

    Hi GV,
    Checks must be done to nth degree. Check mutation level/death rate of small organisms around Japan and the sea area and use as model for worst case scenarios ..check the currents that the water stays around Japan area… then check for negatives. A big danger is that tiny complex life is destroyed or mutated. A lot of this life oxygenates the seas. Fish breath too. Keep the water for irradiation systems to fight the next pandemic especially if there is a leak out of a biolab making viral spikes smarter for faster invasion/transmission.

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