Darlington Nuclear Generating Station
Ontario Power Generation (OPG) owns and is licensed to operate the Darlington Nuclear Generating Station, located in the municipality of Clarington, on the north shore of Lake Ontario. OPG also operates a nuclear waste management facility at the station. The CNSC has full-time staff onsite who perform inspections to evaluate operations and to verify compliance with regulatory requirements and licence conditions.
- Plant Information
- Latest CNSC Plant-Specific Announcements
- Latest Licensee Public Disclosures
- Regulatory Reporting
- Other Key Topics
- Adjacent Nuclear Facility and Project
Location: Clarington, Ontario
Operator: Ontario Power Generation
Reactor type: CANDU (CANada Deuterium Uranium)
Vendor: Atomic Energy of Canada Limited
Number of units: 4 reactors
Installed capacity: 3,512 MW
Status: All four reactors operating
Licence issued: March 1, 2013
Licence expires: December 31, 2014
Start of commercial operation: Between 1990 and 1993
Refurbishment: Planned (Environmental Assessment completed, Integrated Safety Review underway)
Licensing documentation: Request a copy of the Darlington NGS licence and licence condition handbook by email
Latest CNSC Plant-Specific Announcements
- March 14, 2013: CNSC Announces Environmental Assessment Decision on Darlington Refurbishment and Continued Operation
- March 14, 2013: CNSC Renews Darlington Waste Management Facility Operating Licence
- February, 26, 2013: CNSC Renews OPG's Darlington Nuclear Generating Station Operating Licence (revised)
Latest Licensee Public Disclosures
As part of CNSC's regulatory requirements, major licensees must have robust public information and disclosure programs in place. These programs, for nuclear power plants, include a disclosure protocol developed in consultation with community stakeholders. You may visit OPG's Web site for all public site updates triggered by the protocol's disclosure criteria.
- Disclosure Protocol (source: OPG)
- Event Reports–S99 (source: OPG)
- Environmental Reports (source:OPG)
- CNSC Nuclear Power Industry Safety Performance Reports
- Regulatory Actions
Most Recent CNSC Power Reactor Status Report (This report is prepared to update Commission members during most public meetings)
Other Key Topics
- Radiation and Incidence of Cancer around Ontario Nuclear Power Plants from 1990 to 2008 study (the RADICON study)
- Canada's Action Plan in Response to the Nuclear Accident in Japan
- Nuclear Power Plant Safety Systems
- Understanding Nuclear Power Plants: Total Station Blackout
- Browse Hearing Documents
Adjacent Nuclear Facility and Project
Tritium removal facility
The Darlington site includes a Tritium Removal Facility (TRF) designed to minimize the amount of tritium going into the environment, as well as reducing the potential radiation exposure of workers. The TRF extracts tritium from the heavy water used in the reactors. The extracted tritium is then safely stored in stainless steel containers within a concrete vault.
Ontario Power Generation Darlington new nuclear power plant project
The Darlington project is for the site preparation, construction, operation, decommissioning and abandonment of up to four new nuclear reactors at the existing Darlington Site to generate approximately 4,800 megawatts of electricity to the Ontario grid.
Find out more about the status of this project.
March 28, 2013: CNSC Correspondence with OPG on Condenser Cooling Water Option Assessment for the Darlington New Nuclear Project
In August 2011, the Joint Review Panel for the proposed Darlington New Nuclear Project (DNNP) recommended that the CNSC require Ontario Power Generation (OPG) to undertake a formal quantitative cost-benefit analysis for cooling tower and once-through condenser cooling water systems, applying the principle of best available technology economically achievable.
OPG completed an analysis comparing once-through cooling with mechanical draft cooling towers and has selected once-through cooling for the proposed DNNP.
At the request of OPG, CNSC staff reviewed the analysis and are of the opinion that the methodology used by OPG satisfies the Joint Review Panel recommendation. In addition, CNSC staff consider that there are no fundamental barriers to licensing a once-through cooling water system for the proposed DNNP, subject to the conditions outlined in a letter sent to OPG on March 28, 2013.
It is important to note that CNSC staff's review does not bind future decisions made by the Commission, should an application for a licence to construct a nuclear power plant be received. These matters will be brought to the Commission's attention at an upcoming public meeting in August 2013.