radioactive waste repository
1.This paper introduces the latest progress of high level radioactive waste disposal programs in the world, and discusses the key scientific issues as follows： (1) the precise prediction of the evolution of a repository site; (2) the characteristics of deep geological environment; (3) the behaviour of deep rock mass, groundwater and engineering material under coupled conditions (intermediate to high temperatures, geostress, hydraulic, chemical, biological and radiation process, etc); (4) the geochemical behaviour of transuranic radionuclides with low concentration and its movement with groundwater: and (5) the safety assessment of disposal system.
2.Within the framework of the on-surface preliminary heating simulation experimenting later instruments and equipment(OPHELIE) surface mock-up test—a Belgian reference repository concept for high level radioactive waste disposal,an exhaustive experimental program under oedometer conditions was carried out to characterize the thermo-hydro-mechanical(THM) response of the backfill material used.
