Strategic Guidance on the Management of LLW and ILW / LLW ...

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LLW Repository LtdNational Waste ProgrammeNWP/REP/011Issue 2.1 – Jan 2013Page 14 of 584. InventoryWaste inventory information for the UK nuclear industry is periodically collated centrally tomeet specific international reporting requirements [Ref. 7], and currently a UK RadioactiveWaste Inventory (UKRWI) is generated every three years to meet these requirements. Areview of the data pertaining to pond furniture, with refresh of the data by SLCs asappropriate, has been undertaken to develop a discrete inventory of pond furniture wastefor the NDA estate. The inventory is described in terms of volumes, waste types,radiological classifications and timescales for waste generation in the sections below.4.1. AssumptionsA number of specific assumptions have been used in the generation of this wasteinventory:• The primary data set is the UKRWI 2010. The specific assumptions used for thegeneration of the UKRWI 2010 apply to this inventory [Ref. 8].• The data reported is that which is directly attributable as pond furniture within UKRWI2010. It is known that there is a volume of other miscellaneous pond furniture wastethat will be generated by decommissioning of the fuel storage ponds at SLCs(particularly Magnox Ltd. and Sellafield Ltd.) but this is reported within UKRWI 2010under different waste categories and is difficult to attribute as pond furniture waste. Ascurrently the volume and categorisation of this waste cannot be quantified, this wasteis excluded from this inventory.• The information submission from Sellafield Ltd. specifically excludes Multi-ElementBottles (MEBs), a waste type which is exclusive to the Sellafield site and one for whichthere is a defined and ongoing waste management programme.• Data pertaining to any pond furniture in the Sellafield Wet Inlet Facility is specificallyexcluded owing to commercial and security sensitivities.• Only five Magnox Ltd. sites have been identified as possessing an inventory of pondfurniture under the definition of this report (Bradwell, Chapelcross, Oldbury,Dungeness A and Sizewell A). The other Magnox Ltd. facilities do not have wetstorage facilities, or are in a more advanced stage in their decommissioningprogrammes so pond furniture waste has already been managed, or else haveassigned their small volume inventories of pond furniture to other wastestreams (e.g.Hinkley Point and Hunterston).• It is assumed by Magnox Ltd. that all fuel skips are classifiable as ILW (based onhistory and provenance) and characterisation / re-classification of the waste will not beundertaken until retrieval. For this strategic guidance, the pond furniture waste forMagnox Ltd. is assumed to be ILW / LLW cross-boundary waste.• Data for Dounreay is specifically excluded from this study as the Dounreay pondfurniture waste is expected to be structural waste integral to the pond structure andfuel containers specific to the Dounreay site. Dounreay Ltd. does not classify thiswaste as pond furniture under the definition of this strategic guidance.• Data relating to the timescales for waste generation and decommissioningprogrammes in section 4.5 is based on publicly available information published in SLCPlans [Ref. 9, 11, 12] and the UKRWI. It should be noted that schedules, particularlyfor decommissioning activities, are dependent on a range of factors including fundingavailability, corporate priorities and regulatory requirements. Consequently, thesetimescales are subject to change and are provided for indicative purposes only.A company owned by UK Nuclear Waste Management LtdNOT PROTECTIVELY MARKED
LLW Repository LtdNational Waste ProgrammeNWP/REP/011Issue 2.1 – Jan 2013Page 15 of 584.2. VolumesThe total arisings of pond furniture waste within the NDA estate between 2012 and 2100are shown in Figure 3. A total volume of around 14315 m 3 of pond furniture is expected tobe generated during this period, which in the national context equates to 2% of the totalmetallic waste volume declared in the UKRWI 2010 [Ref. 8] or 3% of the total LLWRcapacity. The most significant volume of pond furniture waste is held by Sellafield Ltd. onthe Sellafield site, accounting for approximately 95% of the total volume. The Bradwell site(operated by Magnox Ltd.) has the smallest volume of waste, approximately 0.04% of thetotal, which reflects the fact that the majority of pond furniture waste arising at this site hasalready been retrieved and managed, owing to the maturity of the decommissioningprogramme. The remaining sites – Harwell (managed by RSRL) and Oldbury,Chapelcross, Dungeness A and Sizewell A (managed by Magnox Ltd.) – haveapproximately 1% of the pond furniture inventory respectively.Figure 3 – Total volume of pond furniture waste (m 3 ) within NDA estateTotal volume: 14315.41m 34.3. Waste typesPond furniture is metallic waste but consists of a variety of different types of metal. Figure4 shows the breakdown of waste types at the different sites. The waste identified at theMagnox Ltd. sites (Bradwell, Chapelcross, Dungeness A, Oldbury and Sizewell A)consists entirely of painted mild steel pond skips. The Sellafield waste inventory consistsof a mixture of mild steel and stainless steel, with the majority (approximately 95%) beingstainless steel. A proportion of the mild steel pond furniture at Sellafield is surface coated(painted). The greatest variation in waste type is seen at the Harwell site, where the wasteis a mixture of stainless steel (approximately 60% of the inventory), aluminium(approximately 31% of the inventory) and lead (9%).A company owned by UK Nuclear Waste Management LtdNOT PROTECTIVELY MARKED
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