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Measurement of diffusive properties of intact rock

Abstract

In the Postclosure Assessment of a Reference System for the Disposal of Canada`s Nuclear Fuel Waste (Goodwin et al. 1994) the disposal vault is assumed to be surrounded by a zone of intact rock, referred to as the `exclusion zone.` A sensitivity analysis of the relative effectiveness of the several engineered and natural barriers that contribute to the safety of the reference disposal system has shown that this zone of intact rock is the most effective of these barriers to the movement of radionuclides through the reference system. Peer review of the geosphere model used in the case study for the EIS (Environmental Impact Statement) of the Canadian Nuclear Fuel Waste Management Program has identified the need to quantify the properties of the intact rock surrounding the disposal vault that would control the transport of radionuclides by diffusion. The Postclosure Assessment also identified the need for appropriate values of the free water diffusion coefficient (D{sub o}) for {sup 129}1 and {sup 14}C. The measurement of rock resistivity allows the calculation of the Formation Factor for a rock This review describes the Formation Factor, diffusivity, permeability, and porosity, and how these properties might be measured or inferred for insitu rock under  More>>
Authors:
Publication Date:
Dec 01, 1996
Product Type:
Technical Report
Report Number:
AECL-11439; COG-95-456-I.
Reference Number:
SCA: 540230; PA: AIX-28:072995; EDB-97:146330; NTS-98:006520; SN: 97001878633
Resource Relation:
Other Information: PBD: Dec 1996
Subject:
54 ENVIRONMENTAL SCIENCES; PLUTONIC ROCKS; HYDRAULIC CONDUCTIVITY; CARBON 14; DIFFUSION; GROUND WATER; IODINE 129; PERMEABILITY; POROSITY; RADIONUCLIDE MIGRATION; ROCK-FLUID INTERACTIONS; UNDERGROUND DISPOSAL; WASTE-ROCK INTERACTIONS
OSTI ID:
547990
Research Organizations:
Atomic Energy of Canada Ltd., Pinawa, MB (Canada). Whiteshell Labs.
Country of Origin:
Canada
Language:
English
Other Identifying Numbers:
Other: ON: DE98604437; TRN: CA9700691072995
Availability:
INIS; OSTI as DE98604437
Submitting Site:
INIS
Size:
109 p.
Announcement Date:

Citation Formats

Harvey, K B. Measurement of diffusive properties of intact rock. Canada: N. p., 1996. Web.
Harvey, K B. Measurement of diffusive properties of intact rock. Canada.
Harvey, K B. 1996. "Measurement of diffusive properties of intact rock." Canada.
@misc{etde_547990,
title = {Measurement of diffusive properties of intact rock}
author = {Harvey, K B}
abstractNote = {In the Postclosure Assessment of a Reference System for the Disposal of Canada`s Nuclear Fuel Waste (Goodwin et al. 1994) the disposal vault is assumed to be surrounded by a zone of intact rock, referred to as the `exclusion zone.` A sensitivity analysis of the relative effectiveness of the several engineered and natural barriers that contribute to the safety of the reference disposal system has shown that this zone of intact rock is the most effective of these barriers to the movement of radionuclides through the reference system. Peer review of the geosphere model used in the case study for the EIS (Environmental Impact Statement) of the Canadian Nuclear Fuel Waste Management Program has identified the need to quantify the properties of the intact rock surrounding the disposal vault that would control the transport of radionuclides by diffusion. The Postclosure Assessment also identified the need for appropriate values of the free water diffusion coefficient (D{sub o}) for {sup 129}1 and {sup 14}C. The measurement of rock resistivity allows the calculation of the Formation Factor for a rock This review describes the Formation Factor, diffusivity, permeability, and porosity, and how these properties might be measured or inferred for insitu rock under the conditions that apply to the intact rock surrounding a potential disposal vault. The importance of measuring the intrinsic diffusion coefficient (D{sup i}) of diffusing species under solution salinities simulating those of groundwaters is emphasised, and a method of measurement is described that is independent of the diffusing medium, and which would be appropriate for measurements made in chemically complex media such as groundwaters. (author). 95 refs., 4 tabs., 39 figs.}
place = {Canada}
year = {1996}
month = {Dec}
}