When was the first nuclear power plant built in canada?
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When did the first nuclear power plant start up in Canada?
July 22, 1947
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When was the beginning of designing the first nuclear power plant to be built in Canada?
1942
Nuclear power in Canada
https://en.wikipedia.org/wiki/Nuclear%20power%20in%20Canada
Nuclear power in Canada is provided by 19 commercial reactors with a net capacity of 13.5 gigawatt (GW), producing a total of 95.6 terawatt-hours (TWh) of electricity, which accounted for 16.6% of the country's total electric energy generation in 2015.
Nuclear power in Canada
In 1946, the Montreal Laboratory was closed, and the work continued at the Chalk River Nuclear Laboratories. Building partly on the experimental data obtained from ZEEP, the National Research Experimental (NRX)—a natural uranium, heavy water moderated research reactor—started up on July 22, 1947. 
Nuclear power in Canada
The nuclear industry (as distinct from the uranium industry) in Canada dates back to 1942 when a joint British-Canadian laboratory, the Montreal Laboratory, was set up in Montreal, Quebec, under the administration of the National Research Council of Canada, to develop a design for a heavy-water nuclear reactor. 
Nuclear power in Canada
Nuclear power in Canada is provided by 19 commercial reactors with a net capacity of 13.5 gigawatt, producing a total of 95.6 terawatt-hours of electricity, which accounted for 16.6% of the country's total electric energy generation in 2015. In 1942, the beginning of designing the first nuclear plant to be built started when a joint British-Canadian laboratory, the Montreal Laboratory, was set up in Montreal, Quebec, under the administration of the National Research Council of Canada, to develop a design for a heavy-water nuclear reactor. On July 22, 1947, the first nuclear power plant, Chalk River Nuclear Laboratories, started up. 