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Government officials and nuclear experts inspect a monitoring well at Fukushima nuclear plant, August 7, 2013/AFP

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Worst radioactive leak yet at Japan’s Fukushima

Government officials and nuclear experts inspect a monitoring well at Fukushima nuclear plant, August 7, 2013/AFP

Government officials and nuclear experts inspect a monitoring well at Fukushima nuclear plant, August 7, 2013/AFP

TOKYO August 20- Some 300 tonnes of radioactive water is believed to have leaked from a tank at Japan’s crippled nuclear plant, the worst such leak since the crisis began, the operator said Tuesday.

Tokyo Electric Power Company (TEPCO) said the leak was believed to be continuing Tuesday at Fukushima and it had not yet pinpointed the source of it.

TEPCO said puddles with extremely high radiation levels about 100 millisieverts per hour have been found near the water tanks at the ruined plant.

“This means you are exposed to the level of radiation in an hour that a nuclear plant worker is allowed to be exposed to in five years,” a TEPCO spokesman told a press conference.

The company later said it had identified which tank was faulty but had yet to find the spot from where it was leaking.

“We have instructed TEPCO to find the source of contaminated water and to seal the leakage point,” an official from the Nuclear Regulation Authority told AFP.

“We have also instructed them to retrieve contaminated soil to avoid a further expansion of toxic water, and to strengthen monitoring of the surrounding environment.”

There were no significant changes in radiation levels outside the plant, he added.

Since a quake-generated tsunami struck Fukushima in March 2011, knocking out reactor cooling systems and sparking meltdowns, there have been four similar leaks from tanks of the same design.

But the latest leak was the worst from a tank in terms of volume, the TEPCO spokesman said.

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TEPCO admitted the toxic water might contaminate groundwater and flow into the Pacific Ocean “in the longer term”, but said it was working to avoid such a situation.

“We are transferring the contaminated water from a tank with a leakage problem to unbroken tanks, and retrieving leaked water and soil around it,” the spokesman said.

“We are also beefing up existing earth fill dams around tanks,” he said, as the region braces for heavy rain later on Tuesday.

So far four tonnes of the spilled water had been retrieved since Monday evening when TEPCO started the recovery operation, the company said.

TEPCO has faced a growing catalogue of incidents at the plant including several leaks of radioactive water, following the worst nuclear disaster in a generation.

The company which faces huge clean up and compensation costs has struggled with a massive amount of radioactive water accumulating as a result of continuing water injections to cool reactors.

The embattled utility in July admitted for the first time that radioactive groundwater had been leaking outside the plant. This month it started pumping it out to reduce leakage into the Pacific.

The problems have led the Japanese government and its nuclear regulator to say they would get more directly involved in the cleanup at Fukushima, rather than leaving it to the operator.

While no one is officially recorded as having died as a direct result of the meltdowns of Fukushima’s reactors, large areas around the plant had to be evacuated.

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Tens of thousands of people are still unable to return to their homes.

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