Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 56 / 257 Drying Station Moist Solid Waste Miscellaneous Pre-Sorted Solid Waste Sorting Box Combustible Waste Bulky Waste Compactable Waste Pre- Compactor Shredder Off-Site Incinerator Super Compactor Low Level Waste Repository Waste Metal Decontamination Off-Site Melting Facility Recycling FIGURE 9: STORAGE AND TREATMENT OF SOLID LLW Higher Activity Solid ILW Segregation Treatment Filter Changing Equipment Filter Cartridges in 200 l Drums Buffer Store ILW Interim Storage Conditioning Embedding in Concrete Packaging/ Encapsulation Treatment of Solid ILW Streams FIGURE 10: STORAGE AND TREATMENT OF SOLID ILW STREAMS
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 57 / 257 It is intended that this strategy will incorporate effective, tried and tested waste management options. The options above seek to take a broad view of feasible treatment and conditioning techniques as required to inform a robust waste management strategy. In accordance with good waste minimisation practice, waste arising from the operation of the UK EPR will be segregated at source on the basis of its activity and its physical and chemical characteristics. Waste with a high liquid content, for example solid wastes arising from the treatment of liquid waste, will be dewatered. This process reduces the mass of the waste and the mobility of the radionuclides contained within the waste and facilitates downstream conditioning of the waste. All nuclear material will be retained on-site until it has been appropriately conditioned and packaged or declared as exempt from regulatory control. LLW will be conditioned in accordance with the conditions for acceptance for the selected disposal route [Ref. 33] and transferred off-site. Only ILW will be stored on site for extended periods until such a time as the GDF becomes available. Any ILW produced will be processed and packaged in accordance with the methods agreed in the Letter of Compliance issued by RWMD. This will ensure, so far as is practicable that the waste is suitable for eventual disposal in a GDF and can be stored in a passively safe state on-site in the interim time period. During the timescale for disposal of ILW to a disposal facility it is possible that some wastes may decay below the ILW threshold limits. Although initially stored as ILW these waste streams will be recategorised, removed from the waste store and shipped as LLW. Within the timeframe for final disposal of ILW there may be significant developments in treatment and conditioning processes. For example, advanced treatment and conditioning processes such as separation, transmutation and immobilisation of actinides and fission products which are currently at an early stage of development may become available within this time frame. Therefore, waste forms that provide the option for such advanced conditioning in the future whilst permitting safe interim storage may become the preferred option. Care is therefore required to ensure that the current selected treatment and conditioning options do not preclude future processing. An example of a situation where this could occur is in wastes arising from the treatment of EPR waste liquid (evaporator concentrates, resins). Early encapsulation of these materials would not only increase storage and disposal volumes but could also hinder future waste conditioning. Therefore de-watering of residues has been selected as the preferred approach (e.g. dewatering of resins, in-drum drying of evaporator concentrates) as this technique has been proven in other countries and minimises the volume of waste generated, whilst facilitating future waste conditioning [Ref. 34 and Ref. 35].
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A 2008-11-26 Sarah Greenwood Gary C
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