apan is to issue its gravest warning about the state of the wrecked Fukushima Daiichi nuclear power plant since the facility suffered a triple meltdown almost two and a half years ago.

The new warning, expected on Wednesday, comes only a day after the nuclear watchdog assigned a much lower ranking when the plant’s operator, Tepco, admitted about 300 tonnes of highly toxic water had leaked from a storage tank at the site.

The Nuclear Regulation Authority has now said it will dramatically raise the incident’s severity level from one to three on the eight-point scale used by the International Atomic Energy Agency (IAEA) for radiation releases. Each single-digit increase in the scale actually represents a tenfold increase in the severity of a radiological release, according to the IAEA.

The NRA on Tuesday classified the leakage only as an ‘anomaly’ on the IAEA scale but now considers it a ‘serious incident’.

The leak is the single most dangerous failure at the plant since the 2011 meltdown, which warranted the maximum level of seven on the severity scale, putting it on a par with the Chernobyl disaster 25 years earlier.

‘Judging from the amount and the density of the radiation in the contaminated water that leaked […]

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