uclear Regulatory Commission, told a congressional subcommittee that a new failure at one of the six reactors at the Fukushima Dai-ichi power plant may make it impossible to keep the crippled plant from deteriorating further.
Jaczko said his agency believes all the water has boiled or drained away from a storage pool containing radioactive fuel rods at the plant's No. 4 reactor. That leaves the fuel exposed and could increase radiation leaks to a level that could be lethal to the plant's workers.
"We believe radiation levels are extremely high, which could possibly impact the ability to take corrective measures," Jaczko sa
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