Saline solutions stored underground reused

Container during removal.

Since 20 October 2009, eight containers of the Bakercorp company have initially been removed from the Asse mine premises. In the containers, the saline solution had been stored that had still been collected by the former operator but could not be taken to other mines any longer. Prior to transport, the empty containers were cleaned and decontaminated. They may leave the premises since it can be proved with the release measurement that they are not contaminated with radioactive substances. The saline solutions previously stored in the containers have meanwhile been used for construction works in the mine.

With a radioactive exposure of 300 – 400 Bq/l, the saline solutions are far below the permissible limit values (above 100,000 Bq/l). Thus, they can be disposed of conventionally. However, they are not in compliance with the requirements of the voluntary negotiated environmental agreement of the Federal Office for Radiation Protection, according to which the radiation exposure of the influent saline solutions must be reduced to an absolute minimum. The saline solutions are used for mixing Sorel concrete which is needed for works in the mine.

Currently, there are still six other containers on the premises whose content will soon be processed. Another four containers have already been emptied and are being prepared for transport.