the radioactive fuel inside the plant's reactors but from the pools containing used fuel rods. High radiation levels released from reactor No. 3 Wednesday halted workers' efforts to add water into the cooling ponds in reactor No. 4.
"Probably the biggest concern is the spent fuel pools, because there is a clear pathway for the release of radionuclides [radioactive material] into the environment," says Lyman of the Union of Concerned Scientists.
The storage pools are on an upper floor of the reactor building and are not shielded within heavy containment barriers, as nuclear reactors are. Lyman said the situation in reactor No. 4 is especiall
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