[Microbiological Aspects of Radioactive Waste Storage].

The article gives information about the microorganisms inhabiting in surface storages of solid radioactive waste and deep disposal sites of liquid radioactive waste. It was shown that intensification of microbial processes can lead to significant changes in the chemical composition and physical state of the radioactive waste. It was concluded that the biogeochemical processes can have both a positive effect on the safety of radioactive waste storages (immobilization of RW macrocomponents, a decreased migration ability of radionuclides) and a negative one (biogenic gas production in subterranean formations and destruction of cement matrix).

[Modyfying complex additives in technologies for cementing radioactive waste].

The article presents results obtained in studies concerning properties of cement compounds with radioactive waste, if made with modifying complex additive. Modifying complex additive was proved to influence positively on technologic parameters of cementing liquid and solid radioactive waste, on possible lower volume of cemented waste vs. the volumes obtained through traditional cementing methods without the modifying complex additive, on regulated qualities of end cement compounds with radioactive waste and prevention of biologic corrosion in presence of the modifying complex additive.