Crews make progress on Hanford tank farm improvements

September 3, 2020, 12:07PMAround the Web

Crews work on Hanford's tank farm improvements. Photo: DOE

Work crews at the Department of Energy's Hanford Site recently completed removal and staging of 52 large concrete covers used to shield hoses for transferring radioactive waste between waste tanks in Hanford’s AY and AP farms. (Tank farms are groups of tanks.) The covers, known as “barns,” are being staged as part of an infrastructure improvement project until they can be used in the building of a hose system that will transfer waste from Hanford's A farm to the AP farm.

As part of the "direct-feed low-activity waste approach," according to the DOE on September 1, the AP farm will feed pretreated waste to Hanford’s Waste Treatment and Immobilization Plant (WTP) for vitrification. When completed, the WTP will process and stabilize much of the 56 million gallons of radioactive and chemical waste currently stored at Hanford. The WTP will include four major facilities–pretreatment, low-activity waste (LAW) vitrification, high-level waste vitrification, and the analytical laboratory

The sequenced approach: As originally envisioned, the WTP would treat high-level and low-activity waste simultaneously. To begin treating waste as soon as practicable, however, the DOE developed a sequenced approach that would treat low-activity waste first, by the end of 2023.

The sequenced approach, called direct-feed low-activity waste (DFLAW), sends low-activity waste from the tank farms directly to the LAW vitrification facility. To accommodate DFLAW, a new effluent management facility (EMF) will be built at WTP. Several infrastructure facilities will be modified to handle the capacity reductions needed to support the LAW vitrification facility and EMF only, instead of the entire vitrification complex, according to the DOE.

The DFLAW process is explained through a DOE video.

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