Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 184 / 257 11.2.9 Specific Safety Features 11.2.9.1 Hot Surfaces Some of the treatment and conditioning processes (for example drying) will result in the creation of hot surfaces with the associated potential for operator injury. Additionally, hot surfaces are a potential source of fire. Appropriate engineered protection will be provided to safeguard operators from this hazard. 11.2.9.2 Fire A large proportion of combustible waste will be categorised as LLW. This will be packaged and exported to an LLWR management route as soon as practicable. Appropriate fire protection measures will be installed. 11.2.10 Building Operations The WTB will support all phases of UK EPR operation including: 1. Treatment and conditioning of wastes from UK EPR operations; 2. Treatment and conditioning of wastes from UK EPR decommissioning 5 . The raw waste quantities and composition for each phase will be significantly different. The WTB will be the last nuclear building to be decommissioned during the UK EPR dismantling. As such it must be able to support its own declassification to an undesignated area and removal of the stored waste and its treatment and processing systems. For these reasons the WTB must be able to accommodate the changes required during the transition from the treatment processing of operational wastes to decommissioning wastes. 11.2.10.1 EPR Operational Support The operations of the WTB must accommodate the treatment and conditioning facilities of all operational waste produced from the NPP during its operations. The treatment areas for the proposed mobile modular (e.g. skid mounted) systems will be provided with connections for all services (for example pressurised air, de ionised water, HVAC) as required but will maintain the flexibility to exchange, modify or replace the treatment systems as required. 11.2.10.2 EPR Decommissioning Support Following the transition into EPR decommissioning the liquid and solid waste volumes, composition and processing scope will change. The liquid effluent volumes will be reduced and the volumes of dismantled components that must be treated as solid wastes will increase. As the Reactor and auxilliary buildings are decommissioned the resulting wastes, in particular LLW that cannot be treated within the reactor and auxillary building, will be routed to the WTB. 5 Construction of a dedicated building for the processing of decomissioning wastes is an alternative option.
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 185 / 257 Liquid and solid waste treatment will therefore continue with additional personnel and an increase in the rate of treatment, conditioning, monitoring and shipping. It is intended that segregation of decommissioning waste will occur at the point of generation i.e. in the area that is being decommissioned. In practice there may be a number of areas of the plant that are being decommissioned in parallel resulting in the establishment of a number of disassembly and segregation areas. The process of decommissioning will result in an increased number of heterogeneous, larger components arising from dismantling of the primary circuit. To accommodate these increased waste volumes rooms originally assigned as buffer stores during the operational phase of the EPR will be modified as required. A key objective of the decommissioning process will be to maximise the volume of concrete and metals that can be sentenced and disposed of as exempt from regulatory control. 11.2.10.3 WTB Decommissioning Operations Following completion of decommissioning of the controlled areas of the reactor and other buildings the WTB itself will require decommissioning. The decommissioning of the WTB itself will also result in the generation of radioactive waste. This will require careful planning and the phased introduction of temporary equipment to replace the existing waste treatment equipment, permitting decommissioning of the existing equipment. The modular nature of the WTB will facilitate the installation of temporary treatment equipment.
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