Site Data Availability and Safety Assessment Method Development for Underground Waste Repositories

摘要

The status of the safety assessment method in development for underground solid waste disposal systems is briefly described. Examples of a systematic identification and a preliminary, still qualitative, analysis of the disruptive phenomena are given. To classify the importance of processes and data, which determine the maximum individual dose, a sensitivity analysis is performed for the case of a slow leaching process of high-level waste disposal in the molassis formation of the Swiss Alps by water on the basis of the scarcely available site and sorption data. The importance of the leaching process, convective transport and dilution process is demonstrated for simple decay chains during nuclide migration. Radioactive elements, which determine the maximum individual dose, are Tc, I, C, Ni, Sm, Sn, Np, Cm, U, Pu. Further development and research are recommended in the fields of mathematical modelling and in obtaining nuclide sorption data. (Atomindex citation 13:654350)