Schematic designs for penetration seals for a reference repository in bedded salt

Abstract

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Repository seals requirement study

“…Modified Permeability Zone in Welded Tuff (Modified from Case and Kelsall 1997) The current concepts for sealing exploratory boreholes can be traced back to the early repositorysealing program for the Office of Nuclear Waste Isolation (Kelsall et al, 1986). The concepts are based on the requirement of 10 CFR 60.134 that boreholes should not become preferential pathways for radionuclide migration that was generic to different rock types.…”

“…The concepts are based on the requirement of 10 CFR 60.134 that boreholes should not become preferential pathways for radionuclide migration that was generic to different rock types. Kelsall et al (1986) developed the concept that water flow in boreholes should be limited to a small percentage of the total flow occurring through the repository host rock formation. The percentage would be selected on the basis of conservatism and engineering judgement.…”

Preliminary seal design evaluation for the Waste Isolation Pilot Plant

“…In particular, sodium bentonite is under consideration as a seal material for geologic nuclear waste repositories (e.g., Pusch, 1987;Stormont, 1984;Lopez, 1987;Kelsall et al, 1982).…”

Laboratory Studies of Fluid Flow Through Borehole Seals

“…1980aAppolonia, , 1980bAppolonia, , 1981Kelsall et al, 1982 Report. This report points out that the objective of borehole (and shaft) sealing as related to nuclear waste isolation is to provide an assured seal of any man-made penetrations to prevent or retard (i.e., keep below acceptable levels) the passage of water and gas between the waste repository and the accessible environment.…”

“…Borehole seal designs include cement, clay, and crushed salt as potential sealing materials. The borehole would be sealed in stages (Kelsall et al, 1982):…”