Hostname: page-component-7bb8b95d7b-s9k8s Total loading time: 0 Render date: 2024-09-19T14:22:38.239Z Has data issue: false hasContentIssue false
  • English
  • Français

Transport from the Canister to the Biosphere: Using an Integrated Near-and Far-Field Model

Published online by Cambridge University Press:  03 September 2012

B. Gylling ,
L. Romero ,
L. Moreno  and
I. Neretnieks
B. Gylling
Affiliation:
Department of Chemical Engineering and Technology, Royal Institute of Technology, Stockholm, Sweden
L. Romero
Affiliation:
Department of Chemical Engineering and Technology, Royal Institute of Technology, Stockholm, Sweden
L. Moreno
Affiliation:
Department of Chemical Engineering and Technology, Royal Institute of Technology, Stockholm, Sweden
I. Neretnieks
Affiliation:
Department of Chemical Engineering and Technology, Royal Institute of Technology, Stockholm, Sweden
Get access

Abstract

A coupled model concept which may be used for performance assessment of a nuclear repository is presented. The tool is developed by integration of two models, one near field and one far field model. A compartment model, NUCTRAN, is used to calculate the near field release from a damaged canister. The far field transport through fractured rock is simulated by using CHAN3D, based on a three-dimensional stochastic channel network concept. The near field release depends on the local hydraulic properties of the far field. The transport in the far field in turn depends on where the damaged canister(s) is located. The very large heterogeneities in the rock mass makes it necessary to study both the near field release properties and the location of release at the same time. In order to demonstrate the capabilities of the coupled model concept it is applied on a hypothetical repository located at the Hard Rock Laboratory in Äspö, Sweden. Two main items were studied; the location of a damaged canister in relation to fracture zones and the barrier function of the host rock. In the study of the near field rock as a transport barrier the effect of different tunnel excavation methods which may influence the damage level of the rock around the tunnel was addressed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 1037
Copyright
Copyright © Materials Research Society 1997

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Romero, L., Moreno, L., and Neretnieks, I., Fast multiple path model to calculate radionuclide release from the near filed of a repository, Nuclear Technology, Vol. 112, 1 pp 89–98, (1995).Google Scholar
2. Romero, L., Moreno, L., and Neretnieks, I., The fast multiple path model “Nuctran” -Calculating the radionuclide release from a repository, Nuclear Technology, Vol. 112, 1 pp 99–107, (1995).Google Scholar
3. Moreno, L. and Neretnieks, I., Fluid flow and solute transport in a network of channels, J. of Contaminant Hydrology, 14, pp 163–192, (1993).Google Scholar
4. Munier, R. and Sandstedt, H., SR-95: Hypothetical layout using site data from Äspö, Swedish Nuclear Fuel and Waste Management Co., SKB Progress Report 94–53, Stockholm, (1994).Google Scholar
5. Narasimhan, T. N., and Witherspoon, P. A., An integrated finite difference method for analyzing fluid flow in porous media, Water Resour. Res., 12, 57, (1976).Google Scholar
6. Robinson, P.C., Connectivity, flow and transport in network models of fractured media, Ph. D. Thesis, St. Catherine's College, Oxford University, Ref. TP 1072, (May 1984).Google Scholar
7. Moreno, L., Tsang, Y.W., Tsang, C.F., Hale, F.V., and Neretnieks, I.. Flow and tracer transport in a single fracture. A stochastic model and its relation to some field observations, Water Resour. Res., 24, pp 2033–3048, (1988).Google Scholar
8. Moreno, L., Gylling, B., and Neretnieks, I.. Solute transport in fractured media - the important mechanisms for performance assessment, In print, J. of Contaminant Hydrology, (1996).Google Scholar
9. Boghammar, A., Kemakta Konsult AB, Sweden, (private communication).Google Scholar