The BBC takes a look at the science behind the controversial water release.
On Friday, Tepco said seawater samples taken on Thursday afternoon showed radioactivity levels were well within safe limits, with a tritium concentration below 1,500 Bq/L.
And physicist David Bailey, who runs a French laboratory measuring radioactivity, agreed, adding: "The key thing is how much tritium is there. The US National Association of Marine Laboratories released a statement in December 2022 saying it was not convinced by Japan's data. Shaun Burnie, a senior nuclear specialist with Greenpeace East Asia, says tritium can have "direct negative effects" on plants and animals if ingested, including "reduced fertility" and "damage to cell structures, including DNA".
Experts say the waste water could be carried by ocean currents, particularly the cross-Pacific Kuroshio current.
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