Lessons Learned from Large Decommissioning Projects

摘要

The lessons learned from large decommissioning projects may be summarized as follows: 1. Decommissioning planning should be initiated prior to shutdown in order to start decommissioning operations as early as possible.Licensing documents should be adapted to the new risk profile, which results in a significant reduction of the safety systems. 2. Waste storage areas should be provided with sufficient capacity at all times. Conditioning / storage of highly activated wastes will require specific auxiliary facilities. 3. Detailed characterization and management plans should be established for the different waste streams in order to ensure a fast and smooth logistic of materials. 4. Large containers should be used for highly activated/contaminated components in order to reduce segmentation costs and operator doses. 5. Segmentation of activated components should be performed by mechanical cutting in order to minimize secondary wastes. 6. Site remediation generates large volumes of material to be monitored and large amounts of very low level waste to be disposed. A well-established clearance process will contribute to the minimization of wastes resulting from remediation.