- Trial Phase: Current Works
- Operation of the mine
- Emergency Preparedness
- Radiation Protection
- Environmental monitoring
- Control and surveillance
- Decommissioning Concept
- Decommissioning Planning
- Plan-approval procedure
Necessary stabilisation and safeguards measures approved
The Landesamt für Bergbau, Energie und Geologie (LBEG) approved the necessary measures to stabilise and safeguard the Asse mine on the 750-m level that were announced some months ago. Accordingly, galleries and cavities in the vicinity of the emplacement galleries are to be backfilled with special concrete. Following a comprehensive, professional examination, the Federal Office for Radiation Protection (BfS) presented a study supporting the planned procedure in May 2016.
Among others, the stabilisation and safeguards measures are a prerequisite for retrieval. They reduce crack formation in the rock and thus the risk of the mine drowning. Stable rock areas are necessary for the construction of safeguards systems and access roads for retrieval. The works are also part of the legally demanded emergency measures. In the event of an emergency, this process limits the dispersion of radioactive substances.
For several years, the mine has been stabilised by various measures. On the 725-m level and on the 750-m level, this has been done since 2013. As a result of the mine having been kept open, partially over 100 years, the rock on these levels is particularly strained and has become fragile.
The planned measures were discussed with the Asse Monitoring Group in 2012. Continuing to keep the mine areas in the vicinity of the emplacement chambers open – as demanded by the Asse Monitoring Group – is incompatible with the safety goals. This is the result of an analysis in which experts highlighted and balanced all benefits and disadvantages of the planned security measures Besides, experts of various institutions agreed upon the necessity of emergency planning on the occasion of a professional workshop organised by the BfS in 2012.
With the licence granted by the LBEG and the nuclear licence, the legal prerequisites for the planned works are now available. Some preparatory work is still to be carried out before the actual stabilisation measures may begin.
State of 2016.08.24