Abstract
The construction of a high level radioactive waste repository is commenced, by the steps of site characterization survey, design, construction, operation and sealing after the disposal site is selected. The required technologies of sealing are backfill, plugging and grouting. Upon composing of the sealing concept, it is important to rationally combine these technologies. This report made an evaluation on the performance of the element technologies for sealing from the view point of radioactive nuclide migration. As the result, we indicated that the plugging and grouting are effective for sealing against the disturbed zone, cracks, etc., of rockbed which increase the migration speed of the radioactive nuclide, and we proposed the main points of the sealing concept.
