Community Research and Development Information Service - CORDIS


Integrated in situ corrosion test on alpha-active high-level waste (HLW) glass ¿ Phase 2 (CORALUS-2), Final report

Project ID: FIKW-CT-2000-00011
Funded under: FP5-EAECTP C


The CORALUS project aimed at assessing and demonstrating the performance of the SON 68 glass - a reference glass simulating the French R7T7 HLW (high-level waste) glass - in conditions that are representative for those expected in a disposal system relying on the use of a clay-based backfill material. More specifically, the objectives of the CORALUS project were:
1. To provide realistic data on and to gain more insights in the dissolution of SON 68 glass - a reference glass simulating the COGEMA R7T7 SON 68 HLW glass - and in the release and the migration of radionuclides and some other incorporated elements into the backfill materials at high density.
2. To estimate the extent of the thermal and radiolytic gas generation in the three backfill materials that are studied in the CORALUS test.
3. To assess, for a Ca-bentonite-based backfill material, the mineralogical alteration upon prolonged heating and gamma irradiation.
In the CORALUS in situ tests, four test tubes were placed in the boom clay through the HADES underground research facility at temperatures of 30 or 90°C, for durations between 1.3 and 10 years. Each test tube consists of three modules, containing non-radioactive and highly alpha-active (237Np, 238-242Pu, or 241Am doped) SON 68 glass samples in direct contact with a backfill material with swelling pressure of 2 MPa. Three backfill materials are studied: dried boom clay and two bentonite-based materials, one of them containing 5 weight of powdered glass frit. The interstitial backfill solution can be sampled through built-in piezometers. The test tubes at 90°C contain 60Co sources.

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