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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
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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

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References

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