Abstract

For a series configurations of high-level waste (HLW) storage in a salt repository, gamma transport and deposition have been calculated together with the heating of the salt around waste containers. These time-dependent data were used to calculate colloid growth due to irradiation using a theory by Jain and Lidiard. The results show that by a proper choice of storage parameters the colloid fraction can be limited to a few percent. Overpacking by a few centimeters of steel will reduce the amount to < 1%. With the methods described a safe and economic design of HLW containers for final disposal will be possible.

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