The Douglas Point Nuclear Generating Station was Canada’s first full-scale nuclear power plant and the second CANDU (CANada Deuterium Uranium) pressurised heavy water reactor. Its success was a major milestone and marked Canada's entry into the global nuclear power scene. The same site was later used for the Bruce Nuclear Generating Station, which was built just to the south of Douglas Point. Douglas Point was built and owned by Atomic Energy of Canada Limited (AECL) but operated by Ontario Hydro. It was in service from 26 September 1968 to 5 May 1984. The plant served as a teaching tool for the emerging Canadian nuclear industry, and the experience gained was applied to the later CANDU power plants. Design The first CANDU was a demonstration unit, the Nuclear Power Demonstrator (NPD). In 1958, before NPD was complete, AECL formed the Nuclear Power Plant Division at Ontario Hydro’s A.W. Manby Service Centre in Toronto to manage the construction of a full-scale prototype for future CANDU commercial power plants. Ontario Hydro would operate the prototype. The plant would have a 200 MWe reactor and be built in Ontario. The reactor's stainless steel calandria would mass 54.4 tonne (60 ton) and have a diameter. The design was compact to reduce the required amount of heavy water moderator; the reactor required several tons of heavy water, which was very expensive at $26 per pound (roughly 5 cents per gram). The added cost of using heavy water was at least partially offset by the ability to use natural uranium and forego uranium enrichment - a technology which Canada did not have access to when the CANDU design was developed. While the natural uranium fuel allows for lower burnup than enriched fuel as used in light water reactors, overall more thermal power is extracted from the same amount of uranium ore in a heavy water reactor than in a comparable light water reactor. However, a higher amount of spent nuclear fuel is produced. Foregoing enrichment also means that no depleted uranium is left over. As the lower burnup requires more frequent refueling, the CANDU was designed to be capable of online refueling, a feature successfully demonstrated at Douglas Point (see below) and still a distinguishing factor of the CANDU design. Sites along Lake Huron on the shoreline north of Manitoulin Island and along the shoreline from Tobermory to Goderich were considered. Low-lying Douglas Point, within the latter