Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 206 / 257 b) Transport container re-handling and tilting in vertical position In the existing designs, all transport containers arrive in a horizontal position. The transport container is therefore tilted into a vertical position using the reception hall crane, fitted with a specific handling beam. c) Transport container positioning onto the transfer trolley Once in a vertical position, the transport container is placed onto a transport container transfer trolley. The trolley is designed to ensure that the transport container is held securely and that it will remain safe in the event of an earthquake. After local clearance by the operator, all the transfer operations are monitored from the control room. An emergency stop can be ordered locally if needed. After the door is opened, the trolley moves to the preparation station. d) Transport container preparation In the transport container preparation room, before transfer of the transport container to unloading area, the following operations are performed: · Monitoring of the atmosphere between the inner and outer transport container lids to confirm that the transport container inner lid remains tight; · Removal of the outer lid; · Monitoring of the transport container inner atmosphere for krypton to confirm that no fuel has been leaking during the transport. If krypton is detected a specific procedure will be carried out; · Unscrewing of the inner lid; · Fixing of a docking adapter onto the inner lid. e) Transport container return The operations described above are performed in reverse order when preparing fuel assemblies for export from the facility. 13.2.2.2 Fuel Assemblies Handling And Loading In Baskets These operations take place in the process building and involve loading the fuel assemblies into the storage baskets. A fuel assembly is placed into each of the 9 partition cells of the storage baskets using a crane provided in the unloading cell. a) New basket introduction New baskets are introduced in the process building via the reception hall and are moved to the spent fuel pool. They are placed into the spent fuel pool using the pool overhead crane.
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 207 / 257 b) Transport container inner lid opening This operation is performed remotely. After preparation, the transport container is transferred to the transport container docking station and the transport container is docked to the unloading cell. The transport container docking system ensures that the connection between the transport container internal cavity and the spent fuel unloading cell is fully sealed. The transport container inner lid is removed by means of the in-cell jib crane. c) Fuel assemblies unloading from the transport container Fuel assemblies are unloaded by the unloading cell handling crane. The fuel assemblies are first transferred to a cooling and rinsing enclosure before being transferred into the storage baskets. Once spent fuel assemblies are unloaded, the internal cavity of the transport container is checked using a camera mounted on the crane. Once it has been confirmed that the transport container is empty the transport container is closed by the jib crane of the docking station. d) Fuel assembly cooling and rinsing The unloaded fuel assemblies are cooled and rinsed by immersing them in a water-filled enclosure. This operation ensures: · The detection of leaking fuel by monitoring the water for radioactivity; Note: If a leaking fuel assembly is detected, it can be stored in a dedicated bottle which prevents the spread of contamination in the storage pool. In that case, specific baskets holding 4 bottles are used. No other specific measure is taken once the basket holding the bottles is stored in the pool until it is evacuated. · The removal of corrosion and activation products from the fuel elements. e) Fuel assembly loading in storage baskets The fuel assemblies are introduced one by one into the 9-cell storage basket. The top of the basket is level with the unloading cell floor to avoid unnecessary lifting height of the fuel assemblies. A metallic transfer device, fitted with a lateral door houses the storage baskets and moves them from their loading position in the cell to the reception position at the bottom of the transfer channel. 13.2.2.3 Handling And Storage Of Baskets The transfer channel from the unloading cell to the spent fuel storage pool is closed by a trap-door to protect the channel from any tools or equipment dropped during maintenance operations inside the unloading cell. The storage and retrieval of baskets are undertaken with a remotely controlled mast crane. It should be emphasized at this point that handling of bare fuel assemblies inside the spent fuel pool should not be required. Baskets are moved inside the pool building from the transfer device to the basket storage position in the pool, and from their storage position in the pool to the transfer device upon retrieval.
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Solid Radioactive Waste Strategy Report.pdf - UK EPR

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