Appendix CRF - Part 3 - Northamptonshire County Council

cap”. The assumption is that the waste is shielded by a 1.5m thick cap, although
in practice this is likely to be a conservative assumption.
8.12.4 The results shows that the resulting doses from a worst case where the landfill is
filled with the worst case nuclide at the maximum concentration, are far below the
dose criterion. This case does not constrain landfill capacity.
8.13 Post –Closure not expected to occur
Exposure by Using Groundwater from a Borehole Constructed
at the Boundary of the Landfill
8.13.1 The dose criterion is the lower dose guidance level of 3 mSv/yr for the public for
an intrusion scenario.
8.13.2 The scenario applies only to members of the public post-closure and is unlikely to
occur given the presence of the hazardous landfill.
8.13.3 The scenario is that a new groundwater abstraction point is licensed at the
boundary of the landfill site. The scenario is assessed in Annex B, table 5.1”Site
boundary drinking”.
8.13.4 The resulting radiological capacities and tonnage capacities (based on the
maximum concentration of 200 Bq/g) are shown below in order of ascending
capacity with the most restricted capacity nuclides at the top of the table.
8.13.5 With the exception of I-129 and Np-237 the tonnage capacities are larger than the
physical size of the landfill void. This scenario has the potential to constrain
landfill capacity.
Application for disposal of LLW including HV-VLLW under RSA 1993,
for the East Northants Resource Management Facility:
Supporting Information
July 2009
75
WS010001/ENRMF/CONSAPPCRF 394