Conference Proceedings Paper
ASSESSING RADIOLOGICAL DOSE TO MEMBERS OF THE PUBLIC AND WORKERS DURING USED NUCLEAR FUEL TRANSPORTATION
3rd Canadian Nuclear Waste Management Decommissioning and Environmental Restoration - 2016 Sept. 11-14
U. Stahmer (Nuclear Waste Management Organization)
Large scale transportation of Canada’s inventory of used nuclear fuel is still several decades away. However, the impact of the used fuel transportation program is actively being evaluated. This assessment examines the potential radiological dose that may be received by members of the public and transportation workers resulting from the transportation of used nuclear fuel by road using the Used Fuel Transportation Package (UFTP)
As transportation of used nuclear fuel will occur in the public domain, members of the public and transportation workers may be in the proximity of passing UFTP shipments. Thus, the radiological impact of used fuel shipments on residents along transport routes, individuals in vehicles sharing the transport routes, individuals at rest stops, cyclists, UFTP transport crew, transportation inspectors, roadside workers, etc. is examined.
Using dose rates at various distances from the UFTP, and estimated exposure time, distance and frequency data (placing an individual near the UFTP) gathered by researchers from Carleton University, doses to individuals are calculated. These doses are compared to the regulatory dose limits defined in the Radiation Protection Regulations published by the Canadian Nuclear Safety Commission (CNSC). Activities including package loading, preparation for shipment, and securing onto the transport trailer are typically conducted by workers at a licensed facility and are thus outside the scope of this assessment.
Annual radiological dose to individuals is calculated to range from 1.3 x 10-6 mSv for a hitchhiker along the transport route (equivalent to 1 second in an airplane at altitude) to 0.35 mSv for the transport crew of used fuel shipments (equivalent to 90 hours in an airplane at altitude). All doses to members of the public and transportation workers are calculated to be below the annual regulatory public dose limit of 1 mSv per year, therefore no individuals including transportation workers require designation as a Nuclear Energy Worker (NEW). However, dose rates and resulting occupational doses received by workers have been calculated and are not based on measured values. Dose monitoring of occupational activities and NEW designation requirements for workers will be established when the radiation protection program is developed, prior to the operational startup of the used fuel transportation program.
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