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Release of Radionuclides from the Near Field by Various Pathways. The Influence by the Sorption Properties in the Near Field.

Published online by Cambridge University Press:  25 February 2011

Leonardo Romero ,
Wars Neretnieks  and
Luis Moreno
Leonardo Romero
Affiliation:
Department of Chemical Engineering, Royal Institute of Technology, S-100 44 Stockholm, Sweden
Wars Neretnieks
Affiliation:
Department of Chemical Engineering, Royal Institute of Technology, S-100 44 Stockholm, Sweden
Luis Moreno
Affiliation:
Department of Chemical Engineering, Royal Institute of Technology, S-100 44 Stockholm, Sweden
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Abstract

Radionuclides from a damaged canister for spent fuel will leak out through a damage in the canister wall and spread through the surrounding backfill. They will further migrate into water bearing fractures in the rock, up through the backfill into the damaged zone around the drift and into the drift itself. Some substance may also diffuse through the rock to adjacent fracture zones. Underway the nuclides will sorb on the materials along the transport paths. This very complex and variable transport geometry has been modelled using a compartment model which is based on simplifying a full 3 dimensional integrated finite difference model. The simplifications are supplemented by introducing analytical and semianalytical solutions at sensitive locations such as entrances and exits from damages and fractures and in the flowing water. The model has been tested against full 3D solutions with good results. Sample calculations are presented and discussed for a nuclide with the chemical properties of Pu-239.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 257: Symposium – Scientific Basis for Nuclear Waste Management XV , 1991 , 699
Copyright
Copyright © Materials Research Society 1992

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References

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