RICHLAND, Wash. -- Hanford workers used high-tech explosives to demolish the last reactor at the nuclear site.
The explosion shook the ground and sent up some dust over the weekend.
The structure previously housed the largest nuclear test reactor in Hanford's 300 area.
It was the last of six to be demolished.
Hanford officials said the explosion was a necessary part of completing the cleanup along the Columbia River.
Explosives are considered the safest route for demolition.
The reactor's core was removed earlier this year.