January 30, 2024
from the Waste Acceptance Criteria https://www.cnl.ca/wp-content/uploads/2021/03/Near-Surface-Disposal-Facility-Waste-Acceptance-Criteria-Rev-4_EN.pdf
An intervenor in the CNSC licensing hearings for the NSDF license amendment, Dr. JR Walker, included this table in his final submission in 2023. The table includes half-lives and as can be seen below, more than half of them (21 out of 31) have half-lives longer than the 550 year design life of the facility.
Ole Hendrickson and Frank Greening provided this information on half-lives, mass and number of radioactive atoms for each isotope in the NSDF licensed inventory:
Here is a screen shot from the Excel file. Only the top eight short lived radionuclides in the table have half-lives less than the 550 year design life of the NSDF.
The table shows that long lived isotopes comprise more than 99.9% of the mass of radionuclides and the number of radioactive atoms licensed for emplacement in the NSDF.
Concerned Citizens of Renfrew County and Area 
[…] Twenty-five out of the 31 radionuclides listed in the reference inventory for the mound are long-lived with half-lives from thousands to millions of years. (See also licensed inventory) […]
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[…] Vingt-cinq des 31 éléments radioactifs identifiés dans l’inventaire de référence du futur monticule ont de longues demi-vies, allant de plusieurs milliers à plusieurs millions d’années. (Voir également l’inventaire autorisé.) […]
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[…] NSDF Licensed Inventory […]
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[…] waste at Chalk River Laboratories, less than one kilometre from the Ottawa River. According to the licensed inventory for the facility, more than half of the radionuclides are long-lived with half-lives exceeding […]
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[…] waste at Chalk River Laboratories, less than one kilometre from the Ottawa River. According to the licensed inventory for the facility, more than half of the radionuclides are long-lived with half-lives exceeding […]
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[…] The federal government initiated the Nuclear Legacy Liabilities Program (NLLP) in 2006, a long-term strategy to clean up Chalk River Laboratories and other federal nuclear sites in Ontario, Quebec and Manitoba. As part of the program, a Comprehensive Preliminary Decommissioning Plan was produced. The cleanup was to take place over eighty-five years. One of the first steps was a “Very Low Level” (VLLW) waste facility to dispose of 160,000 cubic meters of waste. A “Low Level” waste facility was not planned until later because waste characterization was in progress and would take considerable time. It is important to note that the “Low Level” radioactive waste at Chalk River is much more dangerous than the “Very Low Level” waste and will remain hazardous and radioactive for many thousands of years. […]
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