Gentilly-2

Gentilly-2 Gentilly-2 was a 675 MW reactor located near Bécancour, Quebec, built by AECL and operated by Hydro-Québec, sited on the south shore of the Saint Lawrence River near Trois-Rivières and Québec City. The plant used a Canadian CANDU reactor design licensed amid debates involving Canadian Nuclear Safety Commission, Atomic Energy of Canada Limited, and provincial authorities, and its lifecycle intersected with national projects such as Point Lepreau Nuclear Generating Station, Bruce Nuclear Generating Station, and policy changes following the Three Mile Island accident and the Fukushima Daiichi nuclear disaster. Major corporate, regulatory, and political actors during its operation included Hydro-Québec, AECL, the Government of Quebec, and reviews influenced by international bodies like the International Atomic Energy Agency and the Nuclear Energy Agency.

Overview

Gentilly-2 was a pressurized heavy-water reactor using heavy water moderation and natural uranium fuel provided within the context of Canadian nuclear technology development led by AECL and suppliers connected to the CANDU reactor program. The plant’s existence related to provincial energy planning authorities, including Hydro-Québec and the Ministry of Energy and Natural Resources (Quebec), while public and political responses involved actors such as the Parti Québécois and the Liberal Party of Quebec. Its siting on the Saint Lawrence River placed it near industrial corridors serving Montreal, Ottawa, and New England, and its economics and environmental footprint were compared against hydroelectric projects like La Grande River developments and thermal stations such as Beauharnois Generating Station.

Design and Construction

Design and construction drew on technologies developed by Atomic Energy of Canada Limited and construction contractors who had worked on projects including Pickering Nuclear Generating Station and Darlington Nuclear Generating Station. Engineering contracts involved firms and consortia with histories in infrastructure projects linked to Canadair, Bombardier, and international suppliers with ties to Westinghouse and Siemens. The reactor core featured pressure tubes and a calandria similar to other CANDU reactor installations, with coolant and moderator systems reflecting design practices validated at Rolphton Reactor prototypes and fielded at Bruce Nuclear Generating Station. Licensing and environmental assessment processes referenced procedures used by the Canadian Environmental Assessment Agency and followed guidelines set by the International Atomic Energy Agency and standards comparable with those at Pickering and Point Lepreau.

Operating History

Operations began in the early 1980s, paralleling the commissioning timelines of Darlington Nuclear Generating Station and expansions at Bruce Power. The plant produced baseload electricity feeding Hydro-Québec's grid and interfaced with transmission networks linked to Hydro-Québec TransÉnergie and cross-border interties to New England Power Pool and New York Independent System Operator. Throughout its operating life, Gentilly-2 underwent outages, refurbishments, and maintenance cycles comparable to life-extension projects at Point Lepreau and Bruce A, coordinated with regulatory oversight by the Canadian Nuclear Safety Commission. Labor relations involved unions such as the Confédération des syndicats nationaux and Canadian Union of Public Employees, and economic considerations were debated by provincial actors including the Quebec National Assembly and ministers overseeing energy policy.

Incidents and Safety Assessments

Safety reviews and incident reports invoked standards and investigations similar to inquiries after the Three Mile Island accident and later analyses following the Fukushima Daiichi nuclear disaster. Regulatory assessments by the Canadian Nuclear Safety Commission and independent experts compared plant performance with international practices endorsed by the International Atomic Energy Agency and the Nuclear Energy Agency. Equipment failures, forced outages, and maintenance events were examined alongside lessons from Pickering and Bruce operations; emergency preparedness planning coordinated with provincial civil protection frameworks and local authorities including the MRC de Bécancour and municipal administrations in Bécancour and Trois-Rivières. Public safety debates engaged civic groups, opposition parties such as the Coalition Avenir Québec, and environmental organizations aligned with international networks like Greenpeace and Sierra Club.

Decommissioning and Waste Management

Following a provincial decision, the plant ceased operation and entered decommissioning processes overseen by Hydro-Québec in coordination with the Canadian Nuclear Safety Commission and technology providers with experience from projects like the decommissioning of Shoreham Nuclear Power Plant and defueling campaigns at Pickering. Radioactive waste management plans referenced Canadian strategies involving the Nuclear Waste Management Organization and storage concepts akin to those debated for repositories in Ontario and national proposals considered by the Government of Canada. Spent fuel removal, dry storage, and long-term stewardship engaged contractors and consultants with backgrounds in projects for Bruce Power and international programs under the oversight of agencies such as the International Atomic Energy Agency. Community and Indigenous consultations involved regional stakeholders including the Abenaki and Wendat communities and municipal bodies while financial, regulatory, and technical milestones aligned with precedents from Point Lepreau refurbishment and international decommissioning case studies.

Category:Buildings and structures in Centre-du-Québec Category:Nuclear power stations in Canada