Modern state of underground storage of liquid radioactive waste

Underground storage of liquid radioactive waste (LRW) has been successfully carried out in Russia over the past 40 years. Stages of development of the technology, its realization and chemical transformations of LRW components are considered and discussed, as well as the modern approach to underground storage. Control of the state of waste products and migration radionuclides and toxic compounds remains the key issue of providing safety of LRW storage. Radiation thermal and biochemical transformations of components of waste form new chemical compounds and, first of all, gases. The formation of gases is one of the important factors determining the safety of underground LRW storage.