Paris "wishes to underline Japan's efforts to make sure this operation fully respects the highest criteria of nuclear safety and protection against radiation," a foreign ministry spokeswoman said.

France "particularly highlights the transparency shown by Japanese teams in their work with the International Atomic Energy Agency (IAEA)," she added.

Japan began on August 24 discharging into the Pacific some of the 1.34 million tonnes of waste water that has collected since a tsunami crippled the Fukushima facility in 2011.

The water, equivalent to 540 Olympic pools, had been used to cool the three reactors that went into meltdown in 2011, in one of the world's worst nuclear catastrophes.

Japan insists that the discharge is safe, a view backed by the UN atomic agency, but China banned all seafood imports from its neighbour, accusing it of treating the sea like a "sewer".

Nuclear plant operator TEPCO said last week that levels of radioactive tritium in tested seawater samples near the plant in northeast Japan were within safe limits.

The first phase of water release ended on September 11, with no date yet set for further discharges -- expected to continue over decades.

France has an interest in boosting nuclear power, as it generates around 70 percent of its electricity with the technology.

It hopes to replace its aging fleet of reactors with new plants to meet targets for reducing greenhouse emissions, but has clashed with other European countries over the plans.

Like other Western capitals, Paris also hopes to weigh more heavily in the Asia-Pacific region to counteract China's influence.

"China has been running an unprecedented disinformation campaign" about the wastewater discharges, Foundation for Strategic Research (FRS) expert Antoine Bondaz wrote on X (formerly Twitter).

Japan "needs more forthright support given the wave of lies spread by Beijing," he added, calling France's statement "necessary and positive".

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