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Sensitivity analysis using two-dimensional models of the Whiteshell geosphere

Abstract

As part of the assessment of the environmental impact of disposing of immobilized nuclear fuel waste in a vault deep within plutonic rock, detailed modelling of groundwater flow, heat transport and containment transport through the geosphere is being performed using the MOTIF finite-element computer code. The first geosphere model is being developed using data from the Whiteshell Research Area, with a hypothetical disposal vault at a depth of 500 m. This report briefly describes the conceptual model and then describes in detail the two-dimensional simulations used to help initially define an adequate three-dimensional representation, select a suitable form for the simplified model to be used in the overall systems assessment with the SYVAC computer code, and perform some sensitivity analysis. The sensitivity analysis considers variations in the rock layer properties, variations in fracture zone configurations, the impact of grouting a vault/fracture zone intersection, and variations in boundary conditions. This study shows that the configuration of major fracture zones can have a major influence on groundwater flow patterns. The flows in the major fracture zones can have high velocities and large volumes. The proximity of the radionuclide source to a major fracture zone may strongly influence the time it takes for  More>>
Publication Date:
Dec 01, 1992
Product Type:
Technical Report
Report Number:
AECL-TR-572; COG-92-324
Reference Number:
SCA: 052002; 540230; 990200; SN: 93000960835
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 54 ENVIRONMENTAL SCIENCES; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; 052002; 540230; 990200; WASTE DISPOSAL AND STORAGE; RADIOACTIVE MATERIALS MONITORING AND TRANSPORT; MATHEMATICS AND COMPUTERS
OSTI ID:
10141952
Research Organizations:
Atomic Energy of Canada Ltd., Pinawa, MB (Canada). Whiteshell Labs.
Country of Origin:
Canada
Language:
English
Submitting Site:
OSTI
Size:
43 p.
Announcement Date:
May 05, 1993

Citation Formats

Scheier, N. W., Chan, T., and Stanchell, F. W. Sensitivity analysis using two-dimensional models of the Whiteshell geosphere. Canada: N. p., 1992. Web.
Scheier, N. W., Chan, T., & Stanchell, F. W. Sensitivity analysis using two-dimensional models of the Whiteshell geosphere. Canada.
Scheier, N. W., Chan, T., and Stanchell, F. W. 1992. "Sensitivity analysis using two-dimensional models of the Whiteshell geosphere." Canada.
@misc{etde_10141952,
title = {Sensitivity analysis using two-dimensional models of the Whiteshell geosphere}
author = {Scheier, N. W., Chan, T., and Stanchell, F. W.}
abstractNote = {As part of the assessment of the environmental impact of disposing of immobilized nuclear fuel waste in a vault deep within plutonic rock, detailed modelling of groundwater flow, heat transport and containment transport through the geosphere is being performed using the MOTIF finite-element computer code. The first geosphere model is being developed using data from the Whiteshell Research Area, with a hypothetical disposal vault at a depth of 500 m. This report briefly describes the conceptual model and then describes in detail the two-dimensional simulations used to help initially define an adequate three-dimensional representation, select a suitable form for the simplified model to be used in the overall systems assessment with the SYVAC computer code, and perform some sensitivity analysis. The sensitivity analysis considers variations in the rock layer properties, variations in fracture zone configurations, the impact of grouting a vault/fracture zone intersection, and variations in boundary conditions. This study shows that the configuration of major fracture zones can have a major influence on groundwater flow patterns. The flows in the major fracture zones can have high velocities and large volumes. The proximity of the radionuclide source to a major fracture zone may strongly influence the time it takes for a radionuclide to be transported to the surface. (auth)}
place = {Canada}
year = {1992}
month = {Dec}
}