Researchers study conductivity of crystalline rock in proposed radioactive waste site



The crystalline basement of the Black Forest is under consideration as a possible repository for radioactive waste. Crystalline rock has traditionally been considered impermeable, even though very deep wells such as the Kola well in the former Soviet Union have been found to contain open, water-filled fissures at more than 12,000 m depth. In 1995, researchers investigated the conductivity of the Black Forest crystalline rock and the chemical properties of the water within [Stober, 1995] and found that the crystalline basement is more permeable than once thought. Hydrogeologic evidence revealed the presence of several thermal and mineral water springs in the crystalline rocks, suggesting that the region may be especially poorly suited for the radioactive waste repository.