The Concept
The Decommissioning and Dismantling Concept
- Turbine hall in the Greifswald NPP
- Reactor hall in the Greifswald NPP
After the basic decision had been made to dismantle the radiologically loaded equipment immediately, strategies to get the licenses were developed as well as the technical concepts for decommissioning, dismantling and disposal of the left material. Therefore, big dismantled components are taken to decay storage before cutting and further treatment. The objective was and is to realize everything by own personnel.
- Turbines in the turbine hall (before decommissioning)
Based on a careful technical registration of all facilities, buildings and areas the procedure of decommissioning, dismantling and disposal was developed early. Thus, the necessary facilities and capacities for the dismantling and the treatment of residual material could be planned and provided in time (for example the erection of the Interim Storage North - ISN or the refurbishment of the Central Warm Workshop - WW).
Switching off the Systems
To prepare the dismantling, non required systems are switched off at first, this means they are disconnected and separated from the operating systems, emptied (if necessary), cleaned and permanently isolated. The cutting points are checked and documented.
- Cutting points of disconnected pipes
The systems to be switched off are summarized in sections by cutting point documentation; afterwards they will be examined as switching-off projects in a supervisory procedure.
Dismantling
- Dismantling of turbine parts
The dismantling of the equipment is mainly executed room by room starting with the lower contaminated equipment, continuing with higher contaminated plant parts. To minimize the radiation exposure for the workers it can be sometimes necessary to remove at first the so called "hot spots".
Generally, commercial technical equipment for manual dismantling and cutting is used here.
The reactors and equipment nearby are an exception - because of their high contamination and radioactivity only remote dismantling and cutting are possible at the moment.
Print