TOKYO – Nuclear officials say repairs to monitoring equipment have revealed greater than expected damage at one of Japan's troubled reactors that could delay a resolution to the crisis.
They said Thursday the findings indicate it is likely that partially melted fuel rods inside Unit 1 of the Fukushima Dai-ichi plant had fallen to the bottom of pressure vessel and possibly into the larger containment vessel soon after the March 11 quake and tsunami.
Nuclear Safety and Industrial Agency officials say that there was no danger that the chunks of fuel were still hot or that they could melt through the concrete base of the reactor.
They also said the water level in the unit's core was much lower than previously thought, although temperatures remained far below dangerous levels.
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