Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 176 / 257 11.2.2.2 Sorting Of Solid Waste The waste contained in bags and drums will be monitored at the point of generation and again upon receipt in the buffer store using portable monitoring equipment to identify items with high activity levels. Following monitoring, the waste will be moved to a manual sorting facility. The drums containing the waste to be sorted will be opened, placed on a tilting device and emptied into the sorting box. Following emptying, the drums will be removed to a storage area and then sent back to the operational areas for re-use. The bags will be loaded into the sorting box through a loading flap. The waste will then be extracted onto a sorting table inside the sorting box and sorted manually. The segregation of the waste into different waste groups will be carried out on the basis of different physical and chemical properties, e.g. wet solid waste, combustible and compactable waste, and non-compactable waste. The sorted waste will be collected in drums arranged below the sorting table. Compactable drums will be used for collecting compactable and burnable waste. Non-compactable waste (such as metals) as well as moist solid waste will be collected in 200 litre drums. Bulky, combustible and compactable waste will either be collected in 200 litre drums or in suitable containers for further shredding. The operator will visually monitor filling of the drums. The sorting box has a number of discharge holes below which waste drums will be located on transport trolleys. Following filling of the drum the discharge hole will be covered, the drum lowered and the drum lid manually installed. The drums will then be transported to the buffer storage room pending further treatment. As stated earlier in this description moist compactable solid wastes will be dried prior to further treatment. Following sorting in the sorting box the moist wastes will be transferred to a drum and dried. Monitoring of the temperature/moisture in the ventilation extract pipe will be used to determine when the drying process has been completed. Following completion of the drying process the waste will be monitored prior to placement into compactable drums and super compaction of the waste. 11.2.2.3 Shredding Bulky solid combustible and compactable waste will be size reduced by shredding prior to further treatment. Waste is transported to the shredder and inserted in the loading part of the shredder. The waste is size reduced by the use of a rotating blade assembly. The shredded material then falls through a duct into a compactable drum located directly below the shredder. Once full, the drum will be returned to the storage area and temporarily stored until a sufficient volume of waste for treatment or disposal is collected.
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 177 / 257 11.2.2.4 Super Compaction Combustible and compactable waste to be super compacted will be transferred to the super compactor in compactable drums. The compaction process can be subdivided into the following steps: 1. Supply of compactable drums; 2. Feeding of drums into the super compactor; 3. Compaction of drums; 4. Removal, sorting and storage of compacted drums (pellets); 5. Loading of pellets into a 200 litre drum; 6. Capping and lidding of the drum. The filled compactable drums are positioned on a feeding conveyor and routed to the compactor. The drums are placed into the super compactor using the drum pellet grab. A ram cover separates the compression region of the compactor from the environment so that in the event of a release of contamination during compaction the contamination is contained within the compactor. The compression region is extracted via a filter to the HVAC system. During super compaction the pressing ram driven by hydraulic force is lowered on the compactable drum and the drum, including its contents, is compacted to a smaller volume using a compaction force of about 2000 tonnes. During the compaction process a guide mould is used to constrain the compacted drum ensuring a constant diameter is maintained. Prior to compaction the drum is pierced by a hydraulically driven spike, which is incorporated into the bottom plate of the super compactor. Any liquid released during super compaction is collected in a small collection tank equipped with a pump that is part of the super compactor. After the compaction process is finished, the drum pellet grab will remove the compacted drum (‘pellet’) and place it onto the pellet conveyor. Here the weight, height and dose rate of the drum is measured and recorded. Before the pellets are inserted into the 200 litre drums, the pellets are sorted on the conveyor into height order, to maximise the use of space in the drum. After the pellets are sorted they are picked up from the buffer by means of a pellet-handling device and inserted into a 200 litre drum. The drums are then manually capped and transferred by crane into the drum store where they are stored awaiting disposal. 11.2.3 ILW Streams ILW streams will arrive at the WTB. These will be placed in the appropriate buffer areas, treated and conditioned prior to shipment to the Interim Storage Facility. These waste streams will include: · Spent filter cartridges; · Spent resins; · Higher activity solid wastes. Spent filter cartridges will be inserted directly into 200 litre drums by the filter changing equipment. The drums containing spent filter cartridges will then be inserted into a shielded cask and transported from the nuclear auxiliary building to the WTB where they will be stored for several years (e.g. 5 years) to allow decay of the radioactivity in the tubular shaft store. Once the filters have decayed sufficiently they will be retrieved, conditioned and sent to the ISF.
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