Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 236 / 257 FIGURE 98: DRY UNLOADING CELL INTERNAL VIEW d) Fuel assembly identification Before being placed into a storage canister, the spent fuel assemblies are transferred to a checking station located in front of the unloading cell. The fuel assembly identification is confirmed and a visual check of the fuel assembly integrity is completed. e) Fuel assembly canisterization The fuel assemblies are removed from the transport container and placed in a storage canister, with six fuel assemblies being placed into each storage canister. A transfer trolley performs the following tasks: · carries the empty fuel assembly canister to the canister docking system; · lifts the fuel assembly canister under the docking station; · rotates the fuel assembly canister during the welding and contamination; control operations; and · transfers full canisters to the handling hall. The fuel assemblies canister docking system ensures an airtight connection between the fuel assemblies canister internal cavity and the fuel assembly unloading cell. The fuel assemblies canister lid is then welded shut, with the welding parameters and the rotation speed being monitored continuously during welding.
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 237 / 257 FIGURE 99: WELDING MACHINE The canister external docking area is checked for possible spread of contamination with a smear sample after completion of the welding operation. The canister conditioning operations (evacuation of the air within the canister and filling with inert gas) are then performed. After checking the weld tightness, the fuel assembly canisters are transferred to the storage vault. Note: As the canister provides a containment barrier, there is no need to check cladding integrity at the receipt of fuel assemblies. Leaking fuel, if any, are placed in canister in the same way as intact fuel 13.3.4.2.1Handling and storage of fuel assemblies This part of the facility provides the main storage function for the spent fuel assemblies. It includes all the handling equipment required to place the canisters into the vault and to retrieve canisters and return them to the unloading cell (e.g. for final disposal). a) Fuel assemblies canisters storage operations All storage canisters are placed into vault storage wells using a handling machine. Each well is closed with a lid and a shielding plug. This ensures the radiological protection of the facility operators. Up to two storage canisters may be stacked into a single storage well. The storage wells are cooled by natural convection of air driven around their external surfaces by the decay heat of the spent fuel. b) Storage well preparation Storage wells are fitted with a tight lid and a shielded plug. The lid has two seals to ensure an airtight seal and the shielding plug ensures the radiological shielding function for personnel entering in the handling hall. A protective plate creates a flat and uniform area on the whole slab.
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A 2008-11-26 Sarah Greenwood Gary C
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Solid Radioactive Waste Strategy Report.pdf - UK EPR

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