Tunnel boring machine ‘Harriet Brooks’ is on the way

In June, the 6.97-metre-diameter Tunnel Boring Machine (TBM), named Harriet Brooks after Canada's first nuclear physicist and associated with the Darlington New Nuclear Project’s Condenser Cooling Water work, arrived at the Port of Oshawa from the Netherlands.

After clearing customs and inspection, Harriet Brooks is being unloaded and has begun its journey to the project site. Over the next month, 15 separate loads will travel east on Energy Drive and enter the DNNP site by way of St. Mary’s Cement.

Once on site, Harriet Brooks will be stored until assembly begins in early 2026. When operational, the TBM will bore and line the 3.4-kilometre-long Condenser Cooling Water tunnel—an essential element for bringing Canada’s first grid-scale small modular reactor online.

Learn more about Harriet Brooks and other recent project developments.