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(Image: GETTY)

Inside reactor two at Fukushima Nuclear Power Plant, readings have reached a huge 530 sieverts per hour.

The level, described as "unimaginable" by some experts, is enough to kill with even a brief exposure.

And it far exceeds the reactor's record of 73 sieverts per hour, even with a 30% margin of error.

(Image: GETTY)

Japan's National Institute of Radiological Sciences said it hadn't even considered dealing with such doses.

The institute told The Japan Times newspaper that four sieverts of radiation normally kills half of those exposed.

While just one sievert could lead to infertility, loss of hair and cataracts, with higher doses increasing the risk of cancer.

And it gets worse, because the Tokyo Electric Power Company which runs the plant, says there's a two-metre inside the containment vessel.

They've already confessed that radiation is escaping Fukushima, which sits on Japan's Pacific Ocean coast, through the groundwater.

Radioactivity from the plant has also been detected on the other side of the Atlantic, off the US West Coast, reports claim.

The latest readings spell disaster for attempts to locate the nuclear fuel, remove it and decommission the power plant.

In fact, they're so high that even a robot could only operate inside for two hour before the radiation destroyed it.

The hole, which was discovered in metal grating within the reactor's containment vessel, could be caused by the melted fuel.

Were that confirmed, it would be the first time that melted fuel had been found in any of the three reactors which suffered a meltdown.

Bosses at Tokyo Electric Power Company are also hoping to deploy a camera and radiation sensor to examine accumulated water destroyed reactor one.

(Image: GETTY)

"Confirming the conditions inside the reactor is a first step toward decommissioning," said Japan's Economic Minister, Hiroshige Seko.

"While difficult tasks may arise, we will mobilise all Japan’s technological capabilities to decommission and rebuild Fukushima."

Fukushima suffered meltdowns in reactors one, two and three when an earthquake and tsunami in 2011 devastated Japan.