Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 174 / 257 Liquid Waste Treatment Section Solid Waste Treatment Section Liquid/ Solid Waste Conditioning Section Waste Storage/ Assay/ Dispatch Section FIGURE 65: FLOOR LAYOUT OF A WTB SHOWING SOLID AND LIQUID TREATMENT, AND WASTE STORAGE AREAS. 11.2.2 Solid Waste Treatment The operational solid radioactive waste generated by the EPR will include paper, plastic, metal waste and components arising from maintenance operations in the reactor, concrete and electrical parts. The waste will be collected and stored according to waste type in marked bins at designated locations within the WTB. Typically plastic bags, drums, containers or a combination of these items will be used to store waste. Various wastes are shipped from different locations of the controlled area to the WTB: · VLLW and LLW; · ILW.
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 175 / 257 Typically, the WTB will be directly connected to the nuclear auxiliary building of the UK EPR. All untreated solid wastes will be placed into temporary buffer stores prior to treatment. The waste will be separated into the different fractions dependent on the eventual treatment method. Waste will be stored in these areas until a sufficient quantity has accumulated for a treatment campaign to commence or for shipment for off-site treatment. Once a sufficient volume has been accumulated the waste is routed to the treatment system and the appropriate treatment is initiated. Records will be maintained describing the contents and composition of the waste at each treatment stage. This information will be stored in a central database and used to complete the appropriate storage, transfer and disposal documentation. During all handling operations the radiological properties of the wastes will be carefully considered and monitored and shielding and other measures provided to ensure that doses to operators are reduced. Examples of the types of safety features that will be incorporated into the design of the WTB are provided in this report. The layout of the WTB will be designed to facilitate contamination control. Areas with a high probability of the presence of loose contamination, for example inside the waste sorting box, will be individually connected to the building Heating Ventilation and Air Conditioning (HVAC) system via a pre-filter and other contamination control equipment. Other areas, for example the decontamination booth, will be routed via a series of High Efficiency Particulate in Air (HEPA) filters prior to the connection to the main WTB building HVAC. The airflow direction within the building will be designed to direct potential contamination away from operators towards the HVAC systems. Process layout will be optimised to ensure that handling operations are located away from access routes. The solid waste arisings will initially be collected in-situ in plastic bags. The bags will then be sealed and shipped in either 200 litre drums or other appropriate containers to the buffer areas. From the buffer areas the packages will be retrieved, transported and opened at the appropriate treatment location. These locations will include areas for segregation, sorting, shredding, decontamination, compaction and the controlled area workshop. 11.2.2.1 Segregation Of Solid Waste Prior to treatment by super compaction, the dry solid radioactive waste will be pre-treated to grade and size reduce large items of waste. The first step will be sorting smaller items of solid waste. This will be carried out in the sorting box. Larger items of solid waste will be collected and stored separately to facilitate easier handling of the waste. It is not anticipated that this waste will be sorted using the sorting box. Moist solid waste will be dried to prevent degradation of the waste container during storage. Solid non-compactable waste will be collected in 200 litre drums, stored in the room used for raw waste and treatment by size reduction, decontamination or dismantling in the active workshop.
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