Under the Swiss Jura Mountains, a scientific drilling project is exploring the rock to understand how certain geological formations could permanently isolate radioactive waste. The experience of the Mont Terri underground laboratory could shape the future of deep nuclear storage in Europe.
In the Swiss Jura, the Mont Terri underground laboratory is studying Opalinus clay.
About 200 meters under the Jura Mountains, a network of tunnels serves as a study ground. For over thirty years, the Mont Terri underground laboratory has welcomed European scientists. Their goal is clear: to understand the properties of a compact rock called Opalinus clay.
This sedimentary rock greatly intrigues geologists. Its very low permeability limits water circulation. Since water is the main vector for radioactive migration, a rock that blocks water could also permanently retain nuclear waste underground.
An 800-meter drilling project to map the geological layers around the clay.
To delve deeper into these studies, scientists have launched the DEBORAH project. This program involves drilling to a depth of 800 meters. The goal is simple: to precisely observe the geological layers around the studied clay. This provides researchers with a comprehensive view of the subsurface.
The groundwater flow, a crucial parameter for nuclear storage safety.
In a deep geological storage project, water is a critical factor. Fast circulation could transport radioactive particles. Therefore, scientists need to precisely understand water movements in the rock. This question guides many of the experiments conducted at Mont Terri.
A European scientific collaboration to secure geological nuclear waste storage.
This project brings together several European institutions specialized in geosciences and nuclear science. German, British, and Swiss organizations participate in the analysis, each contributing its methods and models. This collaboration allows for result comparison and interpretation refinement.
The challenge remains immense. Radioactive waste must remain contained for tens of thousands of years. Scientists must anticipate the evolution of the subsurface over very long periods. Every piece of data collected in the drilling process becomes essential.
The project’s results could influence future storage choices in Europe. If the properties of Opalinus clay are confirmed, this rock could become a major solution. It would offer a natural geological barrier capable of protecting the environment sustainably.
