Hundreds of workers took cover after a tunnel in a Washington plutonium finishing plant collapsed Tuesday morning.
The tunnel at the Hanford plant near Richland was full of contaminated particles, including radioactive trains that transport fuel rods, KING5 reported.
The U.S. Department of Energy Richland Operations Office activated the Hanford Emergency Operations Center at 8:26 a.m., after an alert was declared, according to the official Hanford site.
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