Developed Operational Strategy - Low Level Waste Repository Ltd

LLWR Developed Operational Strategy10009/LLWR/LTP Date: March 20106.3 PCM DecommissioningA decommissioning and removal plan has been established to remove all PCM facilities on site. Thisinvolves systematic decommissioning, demolition, and restoration of all those facilities.LLW Repository Ltd. will first complete residual operations and initial decommissioning activities toremove waste materials, redundant operational materials, and equipment, and begin clean-up activitiesin order that the facilities can then be further characterised for continued decommissioning. Next willfollow interim decommissioning which will decontaminate building surfaces and will include isolation,disassembly, and where possible decontamination of equipment, including exploring options forequipment re-use at other NDA sites. Once decontamination is complete, ventilation systems will bedecommissioned. The end state of interim decommissioning will be a ‘cold and dark’ facility ready forfinal decommissioning.FIGURE 11 – PCM FACILITY DECOMMISSIONING STRATEGYPCM DecommissioningMag 10 > 4 > 9 > 5 > 3 > B748 > B726 > B746PCM FacilityRemediationInitialDecommissioningInterimDecommissioningFinalDecommissioning•Residual Waste Removal•Gross Cleanup•Wastes & Bldg Characterised•Non-essential EquipmentRemoval•Gross (Loose)Decontamination•Decontamination(Aggressive Methods)•Clearance Monitoring•Shutdown & Remove VentSystems•Equipment Removal•Demolition•Material Recycling and ReuseThroughout the residual operations, initial, and interim decommissioning stages, the project willassess/evaluate, package, and transport the resulting wastes to the appropriate storage and disposaldestination. Every effort will be undertaken to characterise decommissioning wastes to segregate PCM,LLW, and lower category material. Early examples include characterisation and removal ofapproximately 1400 loose bricks from the magazines as LLW rather than PCM and characterisation of a4.5 tonne steel/concrete cube as LLW. Work methods will be chosen to balance worker safety whileminimising generation of additional wastes. This will also review segregation techniques early for theinterim and final decommissioning to ensure that the waste can be characterised to minimise disposalcosts. For example, sampling efforts have started in an effort to characterise, through statisticalanalysis methods, nearly 570 square metres of 25 mm thick bitumen floor topping material presentthroughout 4 of the 5 magazines. Monitoring results indicate this material is contaminated and requiresremoval as part of the interim decommissioning decontamination efforts. Characterisation of thisPage 50 of 62