Refurbishment and Continued Operation of the Darlington Nuclear Generating Station

The Minister of the Environment has designated this project and the environmental assessment will continue under the former Canadian Environmental Assessment Act.

Ontario Power Generation (OPG) is proposing the refurbishment of the four reactors at the Darlington Nuclear Generating Station and the continued operation of each reactor for a period of approximately 30 years following refurbishment. Refurbishment will require that a number of major components in each reactor be inspected and serviced, including replacement as applicable, during a planned outage. A key refurbishment activity will be removal and replacement of the fuel channel assemblies and feeder pipes in the reactors. Following the planned outage for each reactor, the refurbished unit will be re-fuelled and returned to full power operation. No more than two reactors will be in refurbishment outages at any given time. Ongoing operation after refurbishment, including ancillary systems, will include routine scheduled maintenance activities and inspections. The on-site Darlington Waste Management Facility (DWMF) will be expanded (i.e., additional storage buildings) to accommodate waste from refurbishment and continued operations.

Latest update

March 14, 2013 - The Decision of Responsible Authorities has been taken.



Canadian Nuclear Safety Commission
Andrew McAllister, Environmental Assessment Specialist
P.O.Box 1046, Station B
280 Slater St.
Ottawa, Ontario K1P 5S9
Telephone: 613-943-9650 ext. 0 or 1-800-668-5284
Fax: 613-995-5086

  • Location

    • Darlington (Ontario)
  • Nature of Activity

    • Nuclear Energy
  • Assessment Status

  • Start Date

  • Proponent

    Ontario Power Generation
  • Authorities

    • Canadian Nuclear Safety Commission
    • Fisheries and Oceans Canada
  • Assessment Type

    Screening-type assessment under CEAA 1992
  • Reference Number


This map is for illustrative purposes. The markers represent the approximate locations based on available data. More than one marker may be identified for a given assessment.


Nearby assessments

...within 200 kilometres
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