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The Near-Field Transport Code Tullgarn and its Use in Performance Assessment

Published online by Cambridge University Press:  01 January 1992

Patrik Sellin
Affiliation:
Swedish Nuclear Fuel and Waste Management Company, Stockholm, Sweden
Nils Kjellbert
Affiliation:
Swedish Nuclear Fuel and Waste Management Company, Stockholm, Sweden
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Abstract

The near-field radionuclide migration code Tullgarn has been developed for performance assessment purposes. As a part of the PROPER-code package it has been successfully applied in the SKB 91 safety analysis.

The features and processes included in the code are:

  • - Radioactive chain decay

  • - Different canister failure mechanisms (copper corrosion from sulphide attack, steel corrosion, internal overpressure and initially defective canisters) - Spent fuel dissolution. The model is based on the assumption that the dissolution rate is proportional to the α-dose rate

  • - Transport calculations are done with a resistance-network model. Tullgarn calculates the stationary release of radionuclides from a defect in the canister through the buffer and out into a fracture in the rock or up to the damaged zone under the deposition tunnel.

Tullgarn can be used as a stand-alone model for near-field release calculations or as a submodel in an integrated assessment. In the SKB 91 analysis, Tullgarn gave the source term to the far-field model.

Type
Research Article
Copyright
Copyright © Materials Research Society 1993

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References

1. Final Storage of Spent Nuclear Fuel - KBS-3, SKBF/KBS, Stockholm, 1983.Google Scholar
2. SKB, SKB Technical Report 92–20, Stockholm 1992 Google Scholar
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6. Bengtsson, A., Magnusson, M., Neretnieks, I., Rasmusson, A., KBS Technical Report 83–48, Stockholm, 1983.Google Scholar
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9. Neretnieks, I., Chemical Geology, 55, 175188 (1986).CrossRefGoogle Scholar
10. Werme, L., Sellin, P., Forsyth, R., SKB Technical Report 90–, Stockholm 1990.Google Scholar
11. Nilsson, L., Moreno, L., Neretnieks, I., Romero, L., SKB Technical Report 91–30, Stockholm 1991.Google Scholar

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