The robot was supposed to be able to function for about 10 hours even when exposed to radiation at levels that would cause ordinary electronic devices to malfunction.
TEPCO's new appraisal of the Fukushima No. 3 reactor building shows that all – or nearly all – of the fuel rods contained inside melted onto the floor of the containment vessel.
The revelations cast new light on the $1 billion lawsuit filed by the sailors against Tokyo Electric Power.
Tepco said the levels were undercounted due to errors in its testing of beta radiation, which includes strontium-90, an isotope linked to bone cancer.
Tokyo Electric Power Co (Tepco) still lacks basic understanding of measuring and handling radiation, Nuclear Regulation Authority (NRA) Chairman Shunichi Tanaka said
The first thing that springs to mind when you're sealing off radioactive water is... duct tape?
We don't know exactly what's going on at Fukushima. But then, we're not supposed to.
TEPCO said water samples collected from a well on Thursday contained 400,000 becquerels per litre of beta-ray emitting substances, the highest reading since the nuclear accident was triggered in March 2011.
It just keeps getting worse.
The Japanese PM has ordered TEPCO to close all of the nuclear reactors at Fukushima.
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