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

0977-6Version 1Table 6.1Mapping of trenches and vaults to grid cells. Human intrusion into thegrey grid cells is reported by Hicks and Baldwin (2011); only theadditional vaults mapped in columns 10 and 11 are discussed here.1 2 3 4 5 6 7 8 9 10 11A Trenches 6 and 7B Trenches 4 and 5C Trench 1D Trenches 2 and 3Vault16Vault15Vault19Vault18EFVault 8 Vault 9Vault10Vaults11 &12Vault13Vault14Vault17Vault20Profiles of dose against time are shown for each intrusion event. These profiles showthe maximum dose from an event occurring at a given time; they are not profiles ofannual dose following an intrusion event at a specific time.6.1 Inventory Case AInventory Case A includes wastes currently identified in WIDRAM 09 as destined forLLWR, “LLWR 2” or the planned geological disposal facility.6.1.1 B1a – Geotechnical Investigations: Borehole DrillingFigure 6.1 and Figure 6.2 show the total dose to an engineer during a drilling intrusionat different locations across the facility in the year 2230 and in the year 7000,respectively.The highest calculated doses at 2230 are for intrusions at grid cells C10(1.4 x 10 -4 mSv) and A10 (1.1 x 10 -4 mSv), which relate to Vaults 15 and 16,respectively. As discussed in Sections 2 and 5.2, it has been assumed that a singledriller could be involved in drilling five boreholes at the site. If a single driller wasinvolved in drilling five boreholes into grid cell C10 (Vault 15) at 2230, the dosereceived by the driller would be 7.2 x 10 -4 mSv. The smallest dose would be receivedfor boreholes drilled into grid cell A11 (4.8 x 10 -5 mSv); if five boreholes were drilledthere then the dose received by the driller would be 2.4 x 10 -4 mSv.Galson Sciences Ltd 21 21 March 2011