TEPCO said Friday most of the detectors lying below the pressure vessel at the No. 1 reactor of the crippled Fukushima Daiichi nuclear power plant that check the condition of the control rods have been found damaged.
The damage – mostly burnt wiring or electrical shortages – is believed to have been caused by the intense heat in the wake of a core meltdown.
The utility conducted current tests on the detectors, which each cover 97 control rods, and found only one detector functioned normally, it said.
Junichi Matsumoto, a senior official at the utility, said he believes the detectors suffered such damage as both pressure and temperatures exceeded the given design limits for the pressure vessel.
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