Abstract
Analysis of the core material taken by check drilling of a monolith of cemented radioactive waste in near-surface repositories operated for 15–45 years revealed the presence of damaged areas in the cement matrix. An association of microorganisms capable to cause degradation of silicate materials was found in cement compounds with radioactive waste. The bacterial genera, the metabolite concentrations, and the character of the biogenic acid damage of the cement matrix were determined. It was concluded that the safety level of the longterm storage of conditioned radioactive waste forms can decrease because of disturbances of the immobilization properties of the cement matrix as a result of biogenic damage of its microstructure. Biocidal additives were suggested for preventing degradation processes in the modern stages of radioactive waste cementation.
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