Appendix CRF - Part 3 - Northamptonshire County Council

Radiological Assessment 0820-2
Version 2
The identity and proximity of potentially affected populations or other
environmental receptors.
Potential exposure pathways associated with the potentially affected
populations, such as stream and groundwater discharge points, drinking water
wells and irrigation practices, and atmospheric pathways for gas and dust,
including point source emissions from combustion of landfill gas.
Site management practices, such as waste segregation, coverage of waste, liner
type, permitted leachate head, and leachate management.
Past disposals of radioactive wastes and other wastes that might interact with
radioactive wastes (e.g., organic materials).
3.1.2 Scenarios
As noted above, the selection of applicable scenarios is a site-specific aspect of the
assessment context. As an aid to uniformity of approach, and to make possible the
development of a useable assessment model, a set of potential scenarios is defined
within the SNIFFER methodology (SNIFFER 2006a).
Scenarios are divided into operational and post-closure scenarios. Four exposed
groups are considered.
Site workers. At the type of facility considered using the SNIFFER
methodology, site workers are not considered as radiation workers, and may
have no specific information about the types of material being consigned. In
terms of dose constraints, therefore, they are considered in the same way as
members of the public.
Members of the public living near the site.
Members of the public exploiting potentially contaminated groundwater or
surface water resources. Depending on the hydrological setting of the site, this
group may be the same as the local resident group.
Members of the public living on the site after closure and the withdrawal of
controls.
Potential operational scenarios are presented in Table 3.1 and post-closure scenarios
are presented in Table 3.2.
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