Low- and intermediate-level radioactive waste
In Canada, low- and intermediate-level radioactive waste refers to all forms of radioactive waste, except used nuclear fuel, limited waste from the production of medical isotopes, and the waste from uranium mining and milling.
- Low-level radioactive waste
- Intermediate-level radioactive waste
- Main sources of low- and intermediate-level waste
- Long-term management of low- and intermediate-level waste
Low-level radioactive waste
It includes contaminated equipment from the operation of nuclear power plants (like protective shoe covers and clothing, rags, mops, equipment and tools).
Low-level radioactive waste does not usually require heavy shielding during handling and interim storage. Shielding refers to a barrier (like a concrete wall or protective clothing) between stored waste and nuclear workers.
The owners of low-level radioactive waste are responsible for managing the waste they produce. This usually takes place onsite, within its own facility.
Other than low-level waste originating from nuclear power plants, low-level radioactive waste that requires long-term management may be returned to the manufacturer.
It may also be transferred to an authorized waste management operator, such as the waste management facility operated by Canadian Nuclear Laboratories at its Chalk River Laboratories, on a fee-for-service basis.
Very short-lived low-level radioactive waste (such as that from hospitals, universities and industry) generally contains only small amounts of radioactive materials with short half-lives. This means that radioactivity decays away in hours or days.
Waste in this category is safely held until the radioactivity has decayed to levels authorized by the CNSC. It can then be disposed of by conventional means (in local landfill or sewer systems).
Intermediate-level radioactive waste
Waste that has been exposed to alpha radiation, or that contains long-lived radionuclides in concentrations that require isolation and containment for periods beyond several hundred years, is classified as intermediate-level radioactive waste.
It typically requires shielding during handling and interim storage. This type of waste includes refurbishment waste, ion-exchange resins and some radioactive sources used in radiation therapy.
The owners of intermediate-level radioactive waste are responsible for managing the waste they produce. This usually takes place onsite, within its own facility.
Intermediate-level radioactive waste that requires long-term management may also be returned to the manufacturer or transferred to an authorized waste management operator – such as the waste management facility operated by CNL at its Chalk River Laboratories – on a fee-for-service basis.
Main sources of low- and intermediate-level waste
Ontario Power Generation (OPG), which owns 20 of Canada’s 22 CANDU reactors, is responsible for approximately 77 percent of the operational low- and intermediate-level radioactive waste generated in Canada each year.
CNL produces approximately 17 percent of the total Canadian annual volume, through its research and development activities at CRL and onsite decommissioning activities. CNL has waste storage facilities at its two laboratory sites - Chalk River Laboratories and Whiteshell Laboratories - as well as at its three prototype reactor sites.
CNL also accepts low- and intermediate-level radioactive waste for long-term management from many small producers and users of radioactive materials, amounting to a further three percent of Canada’s annual volume.
The other two CANDU reactors (owned by New Brunswick Power and Hydro-Québec) and Cameco Corporation’s uranium processing and conversion facilities generate most of the remaining waste.
Long-term management of low- and intermediate-level waste
A long-term management strategy is required for low- and intermediate-level waste containing long-lived radioisotopes. The CNSC requires facility operators to ensure they have sufficient funds to cover the costs associated with the long-term management of low- and intermediate-level waste.
Ontario Power Generation’s proposed deep geologic repository
OPG’s proposed deep geologic repository (DGR) will serve as a long-term storage facility for its low- and intermediate-level radioactive waste. An environmental assessment and regulatory review for a site preparation and construction licence are in progress.
It has been proposed to locate the DGR at the Bruce nuclear site in the municipality of Kincardine, Ontario. OPG is proposing that the depository be constructed in the limestone bedrock, hundreds of metres underground.
Read more about the Ontario Power Generation Deep Geologic Repository
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