Underground research laboratory (URL) for geological disposal of radioactive waste and possibility for construction in Bulgaria.

The construction of an underground research laboratory (URL) precedes the construction of a repository for geological disposal of а radioactive waste. The article considers the types of laboratories, their main objectives and tasks. Based on a comparative analysis between the sites selected as prospective for geological disposal in Bulgaria, the Sumer site in the Sumer Formation is proposed for further investigation as an alternative for URL construction. [ABSTRACT FROM AUTHOR]