Nuclear Power Demonstration Closure Project

Rolphton (Ontario)

Reference number: 80121
Federal Responsible Authority: Canadian Nuclear Safety Commission
Proponent: Canadian Nuclear Laboratories
Environmental Assessment Commenced: 2016-05-05
Environmental Assessment Type: Environmental Assessment by Responsible Authority
Status: Environmental assessment in progress

Latest Update

September 10, 2018 - The timelines in Appendix A of the Administrative Protocol between Canadian Nuclear Laboratories (CNL) and the CNSC for the Nuclear Power Demonstration Closure Project have been updated to clarify the environmental assessment (EA), licensing and public hearing processes for the review of the Nuclear Power Demonstration (NPD) Closure Project. CNL has indicated that they require additional time to address information requests (IRs) received on the draft Environmental Impact Statement (EIS) from the federal and provincial authorities as well as from Indigenous groups and members of public. As a result, the final EIS and the public hearing will be delayed. More information is available here.

About the Proposal

Canadian Nuclear Laboratories (CNL) is proposing to decommission the Nuclear Power Demonstration Waste Facility, a former nuclear generating station that operated until 1987. The facility is located in Renfrew County, Ontario, on the south bank of the Ottawa River approximately 225 kilometres northwest of Ottawa.

The structures that currently remain onsite include the main reactor building, a diesel generator, a ventilation stack, a pressure relief duct, a guardhouse, foundations from previously removed structures, two landfills, buried utilities and drainage systems, and temporary structures such as sea containers and portable washrooms.

CNL is proposing an in situ (leaving in place) decommissioning approach.  The following activities are proposed:

  • assembly and operation of a grout batch mixing plant
  • grouting of below-grade (underground) structures
  • removal of above-grade structures for use as backfill
  • installation of concrete cap and engineered barrier over the grouted area
  • final site restoration
  • long-term care and maintenance activities

Some temporary infrastructure – such as mobile offices and washrooms, as well as an increase to the electrical services – would also be required in order to facilitate decommissioning. Water-holding tanks and fuel storage may also be required on site to support the proposed project. Additional groundwater monitoring wells would be installed, as required, to monitor the performance of the in situ decommissioned facility.

Under the Nuclear Safety and Control Act, CNL's proposal requires an amendment to its existing Decommissioning Waste Facility Licence issued by the Canadian Nuclear Safety Commission (CNSC). An environmental assessment (EA) conducted under the Canadian Environmental Assessment Act, 2012 is required, and an EA decision affirming that the proposed activities will not cause significant adverse environmental effects, before the CNSC can make a licensing decision on this proposal.


  • For Public Participation (8)
    Contains all documents related to public participation opportunities
  • News Releases (6)
    Contains all news releases related to this environmental assessment process.
  • Comments Received/Responses (85)
    Contains comments received related to the environmental assessment process and, when applicable, responses to those comments.
  • Additional Information (5)
    Contains additional records related to the project and the environmental assessment process.
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External Links

Please note that access to external websites is provided solely as a courtesy. Users should be aware that the information offered by non‑Government of Canada websites that are not subject to the Official Languages Act might be available in only one language.

For questions or information, please contact:

Canadian Nuclear Safety Commission
Marcelle Phaneuf, Environmental Assessment Officer
280 Slater Street
C.P. 1046, Station B
Ottawa, Ontario K1P 5S9
Telephone: 613-947-3209 or 1-800-668-5284
Fax: 613-995-5086

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