Appendix CRF - Part 3 - Northamptonshire County Council

Radiological Assessment 0820-2
Version 2
Parameter Description Value Units
Vlandfill volume of the waste 672,098 m 3
Df dissolution factor 0.001 -
waste porosity of the waste 0.5 -
degree of saturation of the waste 0.5 -
Table 4.2 Parameter values used in calculating leachate concentrations.
The contamination is assumed to relate to a one-off event, but the resulting
radioactive contamination, CRn,water,spill (Bq m -3 ), is assumed to remain constant for one
year (i.e., no dilution by throughflow):
C
Rn,
water,
spill
C
Rn,
leachate
Galson Sciences Limited 33 14 July 2009
V
( t)
V
where CRn,leachate(t) is the concentration of radionuclide in the leachate at the time of the
spill, t (Bq m -3 ).
Vspill is the volume of leachate in the spill (m 3 ).
Vwater is the volume of the surface water body (m 3 ).
Dose calculations for drinking contaminated water, or ingesting fish taken from
contaminated water are described in Appendix A.
If the contaminated water body is used for irrigation, then a one-off soil
concentration, CRn,soil,spill (Bq kg -1 ), is calculated from:
where Irrigrate
C
Rn,
soil,
spill
C
Rn,
water,
spill
water
spill
Irrig
soil d
is the amount of irrigation in one year (m).
dsoil is the depth of the soil layer being irrigated (m).
soil is the density of the soil (kg m -3 ).
Dose calculations for ingestion of crops grown on irrigated soil and ingestion of
contaminated soil are described in Appendix A. Decay constants and other
radionuclide-specific parameter values are presented in Appendix B. Other parameter
values used in the calculations of specific doses for the ENRMF are listed in Table
4.3.
Parameter Description Value Units
Vspill volume of leachate in the spill 30 m 3
Vwater volume of the surface water body 2 x 10 6 m 3
Irrigrate amount of irrigation in one year 0.3 m
dsoil depth of the soil layer being irrigated 1 m
soil density of the soil 1300 kg m -3
Table 4.3 Parameter values used in the calculation of the effects of leachate
spillage.
rate
soil
WS010001/ENRMF/CONSAPPCRF 583