Building 440 at Chalk River was the building where raw cooling water from the Ottawa River was pumped to and where particulates were allowed to settle before the water was pumped to the NRU and NRX reactors. Two large drawings, each 72 cm by 112 cm, both framed on a plywood backing and covered with 4mm thick sheets of plastic were mounted inside the building. These were retrieved during decommissioning and donated to the Society. For storage reasons the drawings were removed from the frames in May 2020.
