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Fukushima nuclear disaster: Japan to release treated water

  • Published
    23rd Aug, 2023

Japan is gearing up to release the treated radioactive water from the tsunami-hit Fukushima nuclear plant into the Pacific Ocean, despite opposition.

  • In 2011, a tsunami triggered by a magnitude 9.0 earthquake flooded three reactors of the Fukushima Daiichi Nuclear Power Plant.
  • The event is regarded as the world's worst nuclear disaster since Chernobyl.
  • Shortly after, authorities set up an exclusion zone which continued to be expanded as radiation leaked from the plant, forcing more than 150,000 people to evacuate from the area.


  • Some 1.34 million tonnes of water - enough to fill 500 Olympic-size pools - have accumulated since the 2011 tsunami destroyed the plant.
  • The water will be released over 30 years after being filtered and diluted.
  • As per Japan, the water is a necessary step in the lengthy and costly process of decommissioning the plant, which sits on the country's east coast, about 220km (137 miles) north-east of the capital Tokyo.
  • The U.N.’s nuclear watchdog has endorsed the move.

Where is the plant?

  • The Fukushima Daiichi Nuclear Power Plant is in the town of Okuma, in Fukushima Prefecture.
  • It sits on the country's east coast, about 220km (137 miles) north-east of the capital Tokyo.

How safe is the water?

  • The water has been filtered to remove more than 60 radioactive substances.
  • But the water will not be entirely radiation-free as it will still contain tritium and carbon-14- radioactive isotopes of hydrogen and carbon that cannot be easily removed from water.
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