The 660-MW Mactaquac generating station sits on the Saint John River in the province of New Brunswick. Acres has been working with NB Power dealing with AAR and consequent expansion of the concrete structures including the powerhouse, intake, spillway and sluiceways.

Several innovative remedial measures have been undertaken to control the deformations caused by AAR. Numerous slots have been cut in the spillway, powerhouse, intake and penstocks. These slots have balanced the movements and improved alignment of the mechanical equipment. The response of these structures to slot cutting was analyzed in detail using the finite element program GROW3D. GROW3D was developed specifically for the analysis of AAR-affected hydraulic structures.