Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 232 / 257 13.3.4 Dry Storage Vault 13.3.4.1 Design Data FIGURE 96: DRY STORAGE VAULT A key safety feature of the AREVA vault storage design is the canistering of fuel assemblies upon receipt. This provides a containment barrier and prevents the spread of contamination in the facility. The canisters are stainless steel containers provided with aluminium partitions to house fuel assemblies and ensure heat dissipation. The canisters are sealed by welding, filled with inert gas and then lowered into the wells of the vault. For the UK EPR there would be six fuel assemblies per canister and two canisters in each storage well. Although not discussed in this chapter, it is worth noting that a stand-alone vault storage facility would also be capable of accommodating modules for the storage of Intermediate Level Waste.
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 233 / 257 13.3.4.2 Functions and Process systems Whether designed for one or several reactors, the vault-type facility is composed of three main zones: · A reception hall for fuel assembly transport container receipt and preparation for unloading and shipping; · A process and utilities building for: o o Loading fuel assemblies into storage canisters; and Providing all necessary utilities for the storage process, in particular the cooling of storage vaults. · A vault storage building. The main mechanical functions performed in the vault-type facility are described below: Transport container reception, preparation and shipping This part of the facility takes delivery of the transport containers, transfers the transport containers to preparation areas and stores or exports the empty transport containers for return to the reactor. When a fuel assembly is to be exported from the facility (i.e. for final disposal) the reverse operations will take place after loading the fuel assembly into a transport container. The unit comprises the transport container reception hall, the preparation rooms and the process air lock area and is connected to the fuel assemblies unloading unit. a) Transport container arrival The transport container carriage or trailer will arrive in the reception hall. The reception hall doors, which can only be operated after clearance from the control room, will be opened to receive the transport container and the transport container will be transferred to its specific re-handling location where an external contamination check will be performed. b) Transport container re-handling and tilting in vertical position Transport containers arrive at the facility in a horizontal orientation. As transport container unloading is carried out in vertical position, the horizontal transport container has to be tilted 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 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 a credible seismic event. 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.
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Solid Radioactive Waste Strategy Report.pdf - UK EPR

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