nuclear industry in canada nuclear industry in canada nuclear industry in canada is an active business and research sector, producing about 15% of its electricity in nuclear power plants of domestic design. canada is the world's largest exporter of uranium, and has the world's second largest proven reserves. canada also exports nuclear technology within the terms of the nuclear non-proliferation treaty, to which it is a signatory, and is the world's largest producer of radioactive medical isotopes. bruce nuclear generating station near kincardine, ontario history nuclear technology the nuclear industry (as distinct from the uranium industry) in canada dates back to 1942 when a joint british-canadian 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. this reactor was called national research experimental and would be the most powerful research reactor in the world when completed. in the meantime, in 1944, approval was given to proceed with the construction of the smaller zeep (zero energy experimental pile) test reactor at chalk river, ontario and on september 5, 1945, at 3:45 p.m., the 10 watt zeep successfully achieved the first self-sustained nuclear reaction outside the united states. zeep operated for 25 years as a key research facility. the teck cominco smelter in trail, british columbia produced heavy water for the american manhattan project from 1942 to 1956. in 1946, montreal laboratory was closed, and the work continued at 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. it operated for 43 years, producing radioisotopes, undertaking fuels and materials development work for candu reactors, and providing neutrons for physics experiments. it was eventually joined in 1957 by the larger 200 megawatt (mw) national research universal reactor (nru). in 1952, the canadian government formed aecl, a crown corporation with the mandate to develop peaceful uses of nuclear energy. a partnership was formed between aecl, ontario hydro and canadian general electric to build canada's first nuclear power plant, called npd for nuclear power demonstration. the 20 mwe nuclear power demonstration (npd) started operation in 1962 and successfully demonstrated the unique concepts of on-power refuelling using natural uranium fuel, and heavy water moderator and coolant. these defining features formed the basis of a successful fleet of candu power reactors (candu is an acronym for canada deuterium uranium) built and operated in canada and elsewhere. in the late 1960s (1967–1970), canada also developed an experimental miniature nuclear reactor named slowpoke (acronym for safe low-power kritical experiment). the first prototype was built at chalk river and many slowpokes were subsequently built, mainly for research. this reactor design is extremely safe and requires almost no maintenance (it is even licensed to operate unattended overnight); it can run for more than 20 years before the nuclear fuel needs replacement. there was an attempt at commercializing the reactor, as it could be used in remote areas or vehicles (research stations, electric-diesel submarines). then, china entered the market with its slowpoke-like reactor and thus, the project lost its commercial potential. many slowpokes are still in use in canada; there is one running at école polytechnique de montréal, for instance. radioisotopes the existence of canada's early nuclear program, and in particular the powerful nrx research reactor, nurtured a medical isotope and nuclear medicine r&d community at several locations across the country. canada pioneered the cobalt-60 cancer therapy technology that became standard medical practice throughout the world (the first cobalt-60 cancer therapy was administered at the royal victoria hospital in london, ontario on october 27, 1951), and has also been involved in the development of accelerator-based cancer therapy technology. framework natural resources canada oversees nuclear power r&d and regulation in canada, with responsibility for the crown corporation atomic energy of canada limited (aecl) and the regulatory agency, the canadian nuclear safety commission (cnsc). aecl's commercial operations include reactor development, design and construction of candu nuclear reactors, and provision of reactor services and technical support to candu reactors worldwide. power generation the province of ontario dominates canada's nuclear power industry, containing most of the country's nuclear power generating capacity. ontario has 16 operating reactors providing about 50% of the province's electricity, plus two reactors undergoing refurbishment. new brunswick also has one reactor. overall, nuclear power provides about 15% of canada's electricity. the industry employs about 21,000 people directly and 10,000 indirectly. there has been renewed interest in nuclear energy, spurred by increasing demand (particularly within ontario), and the desire to comply with canada's kyoto agreement obligations, although canada withdrew from the kyoto protocol in december 2012. (canada was committed to cutting its greenhouse emissions to 6% below 1990 levels by 2012, but in 2009 emissions were 17% higher than in 1990. the harper government prioritized oil sands development in alberta, and deprioritized improving the environment.) . the government of ontario proposed plans in 2004 to build several new nuclear reactors in the province. the leading candidate is aecl's advanced candu reactor. environmental assessments are currently underway for one site next to bruce power's bruce nuclear generating station in tiverton and another next to ontario power generation's darlington nuclear generating station. bruce power has applied for a license to generate nuclear power at cardinal lake in the province of alberta. medical radioisotopes