Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 238 / 257 Before a canister arrives, the storage well to be used is identified and prepared by: · Removal of the protective plate removal, unscrewing and removal of the lid. These are undertaken manually by an operator; · Operators leave the vault; · The vault door is locked; · The shielding plug is removed by the remote handling machine. The well is then ready to receive a storage canister. c) Canister handling and loading in wells The canisters are conveyed on a transfer trolley through the transfer tunnel to the handling station. The canister is gripped by the handling machine fitted with a canister gripper and is automatically transferred to the allocated storage well location. The handling machine lowers the canister into the well. The stacking level is checked before the storage canister is released. The canister can only be released when a “no load” sensor is activated, thereby preventing a canister being dropped into a well. d) Storage well closing FIGURE 100: HANDLING MACHINE Once the canister is positioned in the well and the well is full (i.e. contains two canisters), the handling machine replaces the shielding plug. Operators can then re-enter the vault and replace the lid and the protective plate.
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 239 / 257 e) Storage wells internal atmosphere checking Periodic monitoring of the primary and secondary barrier integrity is undertaken by analysing the internal well atmosphere. If a leak is detected from one of the storage canisters, both canisters are retrieved from the well, transferred to the unloading cell and opened. The fuel assemblies are placed into two new canisters docked in the transfer tunnel. Once emptied, the failed canisters are dismantled, placed into a specific canister and stored in a dedicated well. The new canisters are processed in the normal way and returned to the vault. Note: if canisters are known to hold leaking fuel, they are subject to more frequent controls in the storage well. f) Storage of fuel assemblies canisters Each dry storage facility module consists of two storage vaults. The dry storage vault modules are constructed as separate units with separate ventilation systems. This modular approach makes the design flexible and allows the facility to respond to a need for increased storage capacity. Each vault includes a number of wells to accommodate the fuel assembly canisters. The canisters are stored vertically, stacked on 2 levels, inside the air-cooled storage wells. g) Canisters retrieval At the end of the storage period, canisters will be retrieved and transferred into the dedicated unloading cell before being exported for final disposal or another long-term storage facility. Cooling of storage vaults Each storage module (comprising 2 vaults) is equipped with an independent cooling circuit. The air cooling system is based on natural convection through a jacket around each vertical storage well and up a stack. Fresh air is supplied through air inlets into the vault bottom plenum. An intermediate plate is located inside each vault to ensure the separation between the low inlet plenum and the vault internal volume. Cooling air is circulated in the well tube annulus and warm air is removed through the module upper plenum before being exhausted through the stack. All discharges will be continuously monitored. The cooling system is designed to maintain concrete walls and stored package temperatures below the maximum permissible values.
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Solid Radioactive Waste Strategy Report.pdf - UK EPR

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