Baldwin TD and Hicks TW, Assessment Calculations for Human ...

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0977-6Version 1The grid for the RDA was implemented in the GoldSim human intrusion model byallocating inventories and material properties to the RDA grid cells (Hicks andBaldwin, 2011). The GoldSim implementation of the grid system for the EDA humanintrusion assessment calculations includes only the six EDA grid cells as indicated inFigure 3.2. Identical exposure pathway equations for each human intrusion event aresolved for each grid cell.3.2 Spatial Variability in Other ParametersSeveral other spatially variable parameters relating to facility design and wastematerial properties were also identified as requiring consideration in the humanintrusion assessment. These factors are summarised as follows:• Profile material thickness. The modelling approach enables the assessment totake account of the varying thickness of the profiling material between theengineered cap and wastes. The single dome design provides a substantialthickness of profiling material above a large area of the trenches, where thepotential for intrusion is greatly reduced.• Thickness of waste layer, which is important in determining the quantity ofmaterial encountered by borehole intrusions. In particular, the discretisationof the vaults captures the variability in waste package stack height withinvaults.• Waste density. There is significant variation in trench and vault wastedensities across the facility, which is captured by the discretisation approach.Galson Sciences Ltd 8 21 March 2011
0977-6Version 1Figure 3.1Grid (rows A to F and 1 to 11 columns) imposed on vaults and trenches to enable representation of spatial variability inradionuclide activity and wasteform and barrier properties. Bay numbers are shown for each trench grid cell. Distances along thegrid sides are in metres.Galson Sciences Ltd 9 21 March 2011
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