Abstract
This chapter focuses on the liquid radioactive waste (LRW) disposal into deep geologic formations by the Research Institute of Atomic Reactors (RIAR), Russia. Geologic-hydrogeological investigations related to deep-well injection in the RIAR district were carried out in several stages. To successfully use deep-well injection, a preliminary study was conducted to determine the physicochemical processes that would occur when complex wastes came into contact with a real reservoir horizon. Control of the radioactive and chemical waste component distribution in the geological medium is conducted by geophysical investigations and chemical-radiochemical sampling of the underground water in the observation wells. The capacity of reservoir horizons, the reliability of their isolation from the earth's surface and shallow horizons of fresh underground waters, and the character and texture of geological structures are determined. Sufficient mastery of waste behavior has given positive prospects for disposal of toxic waste from other enterprises at the RIAR Experimental-Industrial Test Site (EITS). Technologies were developed and safely used for the experimental injection of electrolytic production wastes, pesticides, and chemical process wastes.
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