HLW DISPOSAL OF IN VERTICAL DEPOSITION HOLES WITH CEMENT BACKFILL — PRO AND CONTRA WITH REGARD TO LONG TERM SAFETY OF GEOLOGICAL DISPOSAL FACILITY

Usage of cement based material as an engineering barrier for HLW is considered. This option has a verity of advantages concerning: effective chemical barrier creation; iron containers corrosion reduction; high gas permeability; the same types of engineering barriers for HLW and ILW in repository; easy handling of cement. The main challenge in cement application is accelerated corrosion rate of vitrified waste matrix and relatively high permeability for low absorbing nuclides like ¹²⁹I and ³⁶Cl. However, advantages of cement barrier may override its shortcomings concerning Nigenekansky geological disposal facility where compact HLW emplacement is envisaged within deposition holes of 75 m depth with bentonite barrier and ¹²9I and ³⁶Cl content is insignificant.

Keywords: radioactive waste, geological disposal of, engineering barrier, cement based materials

Bogatov S. A. HLW Disposal of in Verticale Deposition Holes with Cement Backfill — Pro and Contra with Regard to Long Term Safety of Geological Disposal Facility. Radioactive Waste, 2018, no 1 (2), pp. 21—33. (In Russian).