Appendix CRF - Part 3 - Northamptonshire County Council

nuclides (including appropriate daughter chains). The total capacity limit
would be established using an authorised spreadsheet model agreed with the
regulator. The spreadsheet model would represent the most restrictive case
from the risk assessment and would produce as an output the remaining
capacity of the landfill on an individual nuclide basis given the exact wastes
received to that point in time. Prior to accepting any further waste the model
would be used by the landfill operator to determine that the consignment
would not lead to a breach of the total capacity limit. An example
spreadsheet to illustrate the model is included in Annex G. It is considered
that a condition as proposed below will provide robust and enforceable
means of regulating the site capacity:
Radiological capacity is the amount of radioactive material that can
be consigned to the site without any of the potentially exposed
groups considered receiving a dose above a specified criterion, for
the specific scenario.
The radiological capacity for radionuclide Rni in a waste stream
(RCi) is given by:
RC
DC
i
SD
f
Application for disposal of LLW including HV-VLLW under RSA 1993,
for the East Northants Resource Management Facility:
Supporting Information
i
where:
Furthermore:
f
i
i
fi is the fraction of the overall activity arising from Rni
(such that fi=1)
SDi is the specific dose from Rni
DC is the dose constraint
Total activity limit for
each radionuclide (Bq) = Dose Limit (Sv/y).Waste Activity (Bq)
Dose Estimate (Sv/y)
With the additional constraint that the total dose from all of the
radionuclides must not exceed the relevant dose limit:
i Qi / Qi,l