Bechtel National has begun receiving the final shipments of specially designed, leaded-glass shield windows for the Hanford vitrification plant.
The project has purchased 87 shield windows for four buildings -- the Pretreatment Facility, the High Level Waste Facility, the Low Activity Waste Facility and the Analytical Laboratory.
Nine windows have arrived in the past two weeks, and four or five more windows are scheduled to arrive each week until all 87 are at the plant, according to Bechtel. The first shipment of 22 windows arrived in October 2012.
The shield windows are designed to work as a barrier between the radioactive and nonradioactive areas of the facilities and will allow operators to safely observe the work going on in the radioactive hot cells.
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Each shield window weighs 7,200 pounds, is 16 inches thick and measures 75 inches wide by 65 inches tall. The windows have a yellow tint and are made of borosilicate glass and lead.
The final shipments of shield windows are arriving from Premier Technology of Blackfoot, Idaho. The first shipment of windows were manufactured by Hot Cell Services Corp. of Kent.
The shield windows will be stored until they are installed as part of the completion of each facility. Once installed, the windows will go through yearly maintenance and testing.