At approximately 5:00 p.m. on 2020 July 25, during a routine site inspection, a plant operator observed water leaking from a water holding tank at the Port Granby Waste Water Treatment Plant. Upon discovery of the leak, the plant was shut down and actions were taken to drain the tank and stop the leak. It is estimated that 20-50 m3 of water leaked from the tank and entered the storm water management pond located on the site. The leak was confined to the boundary of the licensed site.
Water and soil samples were collected at various locations along the flow pathway, and sent for analysis.
At no time was there a health or safety risk to workers or the public, and the impact on the environment is expected to be negligible.
CNL proactively notified the Canadian Nuclear Safety Commission and the Municipality of Clarington of this event.