• Buffer storage spaces
To ensure continuous and effective capacity utilization in the treatment stages downstream of the demolition process (incl. the residual material treatment center), sorted materials will be stored in buffer storage spaces until they can be further treated. Available spaces in existing buildings and on the plant premises for which a change of use must be applied for within the framework of the 1st DDP will be used as buffer storage spaces.
• Residual material treatment center
The pre-sorted materials will be further broken down and separated into two material flows in the residual material treatment center. The first material flow comprises the so-called residual materials. Here the residual materials are cleaned of any radioactive particles that continue to stick to them using a suitable procedure such as e.g. cleaning, sand blasting or treatment in an ultrasonic bath. These materials can be returned to the recovered substance cycle after a final radiological decontrolling measurement.
The second material flow cannot be returned to the recovered substance cycle but rather must be disposed of as radioactive waste. Such waste is e.g. pressed or dried in the residual material treatment center in order to reduce its extent as much as possible. It is then packaged as prescribed by the applicable statutory requirements for transport to a radioactive waste repository for low- and medium-active radioactive wastes.
• On-site waste storage facilities
The existing on-site storage capacities are insufficient to receive all of the low- and medium-active radioactive wastes that will result from the operation of the second blocks (GKN II and KKP 2) and from the demolition until such a time as they can be transported to a radioactive waste repository. In order nevertheless to ensure a swift and continuous demolition, an additional, temporary waste repository must be created on-site. EnKK thereby will meet its obligations under the Radiation Protection Ordinance on the temporary storage of low- and medium-active radioactive wastes until a radioactive waste repository can be put into operation.
• On-site temporary storage facilities
As opposed to the on-site waste storage facilities the on-site temporary storage facilities already in use are used only to store fuel assemblies in appropriate containers (castor).
• Post-operational phase
Blocks GKN I and KKP 1 have been operating in the so-called post-operational phase since they were taken out of service in 2011. This phase will continue until the 1st DDP is granted. It already contains preparatory work for the demolition: wastes from plant operation, for example, that are still in the plant will be disposed of and returned to the primary cycle in GKN or will undergo system decontamination in KKP. All of this work remains subject to monitoring by the nuclear regulatory authority and will be accompanied by expert's reports.
• The plants
Block 1 of the Philippsburg nuclear power plant is a boiling water reactor commissioned in 1979. Block I of the Neckarwestheim nuclear power plant is a pressurized-water reactor commissioned in 1976. The power operation of both blocks was discontinued in March of 2011 as a consequence of the modifications to the Atomic Energy Act passed by the federal government within the framework of the energy turnaround (thirteenth act on the modification of the Atomic Energy Act). Since this time the plants have been running in the so-called post-operational phase.