RICHLAND – One of the final buildings that will be demolished in the Hanford 300 Area is coming down.
An industrial city once stood just north of Richland to support the production of plutonium for the nation’s nuclear weapons program.
Since 2005, Washington Closure Hanford has reduced about 150 buildings there to rubble, and more were knocked down before Washington Closure won the contract to clean up the Hanford Nuclear Reservation near the Columbia River.
On Thursday two excavators equipped with shears were tearing down the 326 Building. It was known as the Pile Technology building when it was constructed in 1953 and later was called the Material Sciences Laboratory.
The 63,107-square-foot building is the second-to-last major laboratory expected to be torn down in the 300 Area as part of cleanup of Hanford land near the Columbia River.
It’s also the second-to-last building standing in the 300 Area where workers are expecting to encounter significant hazardous contamination.
Work has been postponed for additional planning for the removal of the other remaining laboratory, the 324 Building, after a major spill of high-level radioactive waste was discovered beneath it.
The Department of Energy is legally required by the Tri-Party Agreement to have all excess 300 Area buildings, except the 324 Building, removed by September 2015. A few buildings will remain because they continue to be used by Pacific Northwest National Laboratory.
Because underground utilities must continue to serve those buildings, the 326 Building is being torn down to only about 3 feet below ground to avoid disturbing any services, said Chris Strand, the environmental protection lead for Washington Closure. Then the building’s basement will be cleaned out and filled with dirt.
When buildings used by PNNL eventually come down, the 326 Building’s basement also could be excavated.
Work to tear down the building started about four weeks ago and the aboveground structure should be gone by the end of October, said Ruben Trevino, 300 Area closure manager for Washington Closure. Below-grade work should be completed a few weeks later and debris removed by the end of the year.
The building was used to experiment with the graphite piles that made up reactor cores to find new lattice configurations for loading uranium fuel that would be irradiated.
It also was used to examine reactor components and fuel elements.
“It made plutonium production more efficient,” said Mark French, DOE project director for Hanford along the river.
The L-shaped building had offices along the outside and laboratories along the inside on two floors aboveground.
The basement contained large laboratories, large reactor mock-ups and graphite “piles” like those that made up the core of Hanford reactors. Uranium fuel was loaded into reactor cores to be irradiated. Work with radioactive materials at the lab was done in lead-brick enclosures.
The earliest and most intense radioactive work in the buildings was the operation of the piles in the early 1950s, according to Washington Closure.
Work has been underway to prepare the building for demolition since workers moved out in 2011.