Solid Radioactive Waste Strategy Report.pdf - UK EPR

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10 13 16 19 40 43 46 49 EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 50 / 257 6.4.1 Decay Storage of UK EPR Spent Water Filters Figure 4 shows the radioactive decay characteristics for the spent water filters arising from operation of the UK EPR which, pessimistically, would be ILW at the time of generation. The graph is the total activity for all radionuclides predicted to be present in this waste stream. The primary contributors to the total initial radioactivity of this particular waste are cobalt-60, caesium-137 and iron-55. The levels of radionuclides with longer half-lives are present at levels below the LLWR threshold of 12 GBq/te beta-gamma therefore this waste decays to LLW within a few decades. Long lived radionuclides are present in quantities above the thresholds for both VLLW and Substances of Low Activity (SoLA) and so controlled decay storage to VLLW or SoLA is not feasible. Waste Activity (GBq/te) 1.00E+02 9.00E+01 8.00E+01 7.00E+01 6.00E+01 5.00E+01 4.00E+01 3.00E+01 2.00E+01 1.00E+01 0.00E+00 Waste Activity LLW limit of 12 GBq/te Beta- Gamma 1 22 25 28 31 34 37 4 7 Years FIGURE 4: DECAY STORAGE GRAPH FOR EPR SPENT WATER FILTERS
10 13 16 19 22 46 49 EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 51 / 257 6.4.2 Decay Storage of ILW Dry Active Waste Figure 5 shows the decay characteristics of ILW Dry Active Waste. With this waste it is cobalt- 60 and iron-55 that dominate the activity over the first few years. These decay significantly over the first decade after waste generation, allowing the waste to be reclassified as LLW after ten years. Waste Activity (GBq/te) 4.50E+01 4.00E+01 3.50E+01 3.00E+01 2.50E+01 2.00E+01 1.50E+01 1.00E+01 5.00E+00 0.00E+00 Waste Activity LLW Limit of 12 GBq/te betagamma 1 25 28 31 34 37 40 43 4 7 Years FIGURE 5: DECAY STORAGE OF ILW DRY ACTIVE WASTE
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