Draft Scoping Information Document - Ontario Power Generation

July 2011
Draft Scoping Information Document - Proposal by OPG - Refurbishment and
Continued Operation - Darlington Nuclear Generating Station, Clarington, Ontario
2. SCOPE OF THE ENVIRONMENTAL ASSESSMENT
2.1 Scope of the Project
In establishing the scope of a project for a screening environmental assessment
under the CEAA, the physical works (e.g., facilities) that are involved in the
proposal and any specific undertakings that will be carried out in relation to those
physical works must be determined.
The physical works in this case are the four reactor units at the DNGS and
ancillary systems necessary for their operation through to about 2055. The
proposed undertakings in relation to the physical works are the refurbishment and
continued operation of these units until about 2055.
Decommissioning is not part of the scope of project; however, a description of the
preliminary decommissioning plan will be required for this EA.
Decommissioning will be subject to the requirements under the NSCA and a
determination regarding the application of the CEAA will be made at that time.
The scope of project will consider refurbishment activities, including:
• Site preparation and construction of storage (e.g., interim storage of low and
intermediate-level wastes) and support buildings/structures, generally within
the Protected Area, including:
o Retube Waste Storage Building(s) (not within the Protected Area);
o Heavy Water Storage Building (HWSB);
o Offices, shops and changerooms; and
o Other structures that may be necessary (e.g., building to house volume
reduction equipment).
• Refurbishment activities at each of the four reactor units comprising of the
following activities:
o Defuelling and dewatering of the reactor;
o Management of heavy water during refurbishment, including transfer to
the Heavy Water Storage Building;
o Replacement of reactor components, including fuel channel assemblies
and feeder pipes;
o Repair, maintenance and upgrades of systems and components for
balance of plant;
o Preparation of low and intermediate-level refurbishment waste for
storage;
o Transfer of low and intermediate-level refurbishment waste on the
Darlington site; and
o Management of non-nuclear waste;
e-DOC 3734740 - 4 -
CEAR 11-01-62516