certainly at a crucial stage right now
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A TEPCO official said the engineers were working in a volatile environment and needed to be aware of the danger.
"We would like to let those on site know before we resume work," company official Akira Suzuki said on Friday.
The huge loss of life from the 9.0 magnitude earthquake on March 11 and the tsunami it triggered, together with the prospect of a nuclear nightmare, have brought Japan its darkest days since World War Two.
The crisis at the plant has raised apprehension about nuclear power
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"It is certain that public confidence in nuclear power plants has greatly changed
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"In light of that, we must first end this situation and then study (it) from a zero base."
Japan's 55 nuclear reactors provide about 30 percent of its electric power. The percentage had been expected to rise to 50 percent by 2030, among the highest in the world.
RADIATION FEARS
Alarm has been spreading about leaking radiation.
Tokyo's 13 million residents were told on Wednesday not to give tap water to babies after contamination hit twice the safety level. But it dropped back to safe levels the next day.
Despite government appeals for people not to panic
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"Customers ask us for water. But there's nothing we can do," said Masayoshi Kasahara, a clerk at a Tokyo supermarket. "We are asking for more deliveries
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Radiation above safety levels has also been found in milk and vegetables from Fukushima and the Ky