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CANDU Reactors

CANDU reactors in Ontario

CANDU units at Ontario Power Generation’s Darlington and Pickering sites, as well as those at Bruce Power,  were brought on line in the 1970s, 1980s and 1990s. Since then, they have continuously played an important role in providing Ontarians with a safe and reliable source of baseload electricity. Nuclear energy powers approximately half of Ontario’s home and business needs.


The CANDU 6 reactor offers a combination of proven and superior, state-of-the-art technology. It was designed specifically for electricity production, unlike other major reactor types that evolved from other uses. This focused development is one of the reasons that CANDU has such high fuel efficiency. Candu is proud of the excellent performance of its domestic and international fleet of CANDU 6 reactors.


Candu is currently marketing its Enhanced CANDU 6 reactor, a 700-MWe class heavy-water moderated and cooled reactor. It is an evolutionary design based on the successful CANDU 6 model.

In June 2013, the EC6 completed its third and final pre-licensing review by the Canadian Nuclear Safety Commission (CNSC). Read the executive summary.

Advanced Fuel CANDU Reactors

Candu Fuel Cycle diagram-UPDATE EN-SNC Col 400wOne of the unique features of CANDU reactor design is its ability to use alternative fuels such as recovered uranium (RU) from the reprocessing of used light water reactor fuel, low-enriched uranium (LEU) and plutonium (Pu) mixed oxide, thorium and actinides, in addition to the conventional natural uranium. Candu is currently working with China National Nuclear Corporation to further develop the Advanced Fuel CANDU Reactor (AFCR). In November, 2014, an Expert Panel of Chinese industry and academia nuclear experts issued a statement  confirming that the technology meets Generation III nuclear power requirements; the panel also recommended that the AFCR be further developed. To read more, click here.

Advanced CANDU Reactor (ACR)

The Advanced CANDU Reactor® (ACR-1000®) is an evolutionary, Generation III+, 1200 MWe class heavy water reactor, designed to meet industry and public expectations for safe, reliable, environmentally friendly and low-cost nuclear generation.

The ACR-1000 is the only Generation III+ reactor in the world to have completed Phase 3 of the Canadian Nuclear Safety Commission’s (CNSC) pre-project design review. In December 2010, the CNSC concluded there were no fundamental barriers to licensing the ACR-1000 in Canada. To learn more, click here.