Appendix CRF - Part 3 - Northamptonshire County Council

Radiological Assessment 0820-2
Version 2
scenario even for a non-hazardous waste site with LLW disposals. It is considered
unreasonable for a hazardous waste site receiving LLW where the construction,
operation and monitoring will all reduce the possibility of the barrier failing in a
manner that allows the release of large amounts of leachate. Even if damage did
occur, the potential for environmental damage from leachate from such a site would
ensure that remediation would occur before members of the public were exposed.
The barrier failure scenario has therefore not been assessed.
4.3.4 Site remediation and re-engineering
This scenario was included in the SNIFFER methodology because it was possible that
a site operator would have no records of radioactive waste disposals or their location.
In the case of comparatively large volumes of LLW disposed of to a hazardous waste
landfill, records would be maintained. Any remediation work would be done with the
knowledge that there was radioactive material on the site and it can be assumed that
appropriate precautions against exposure would be adopted.
4.3.5 Bathtubbing
This scenario was included in the SNIFFER methodology to account for the
possibility of excessive infiltration through the cap at a time when the barrier still
prevents leakage to the underlying formation. For a hazardous waste site, it is
envisaged that controls on cap construction and leachate monitoring would prevent or
identify releases through this pathway. For the purpose of the assessment, it has been
assumed that remediation, cognisant of radioactive material, would occur before
members of the public were exposed via this pathway.
Galson Sciences Limited 42 14 July 2009
WS010001/ENRMF/CONSAPPCRF 592