Subseabed disposal of radioactive waste: effects of consolidational fluid flow |
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| Authors: | K Bitzer |
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| Institution: | (1) Facultad de Geologia, Departament de Geoquímica, Petrologia i Prospecció Geològica, Universitat de Barcelona, Zona;(2) Universitaria de Pedralbes, 08071 Barcelona, Spain |
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| Abstract: | Subseabed disposal of radioactive waste applies a multiple-barrier concept with the sediment being the most important barrier for preventing a release of nuclides into the biosphere. While many investigations have been carried out to analyze the risk potential in this type of disposal, the effects of sediment consolidation and associated fluid flow have not fully been taken into consideration. Here, possible effects of consolidational fluid flow in the penetrator disposal option and possible consequences to the transport of nuclides in the sediment are analyzed. Results of numerical experiments demonstrate that consolidation contributes to the transport of radioactive nuclides released from containers buried in the sediment and to the release of nuclides at the sediment-water interface. Both depend on geological conditions and to a large extent on possible alterations of hydraulic conductivity i of the sediment in the vicinity of the entry path of a penetrator.Symbols
c
concentration ml m–3
-
c
a
concentration of adsorbed solute mg kg–1 (relative to dry weight of sorbing substance)
-
c
in
solute concentration of source q mg m–3
-
c
0
initial concentration mg m–3
-
ID
dispersion tensorm
2s–1
-
ID
*
diffusion tensor m2s–1
-
D
coefficient of dispersion m2s–1
-
d
0
coefficient of molecular diffusion m2s–1
-
d
coefficient of effective diffusion m2s–1
-
g
gravity m2s–1
-
h
piezometric pressure m
-
k
hydraulic conductivity m2s–1
-
m
mass kg
-
p
pressure Pa
-
q
source/sink m3s–1
-
S
0
specific surface m2m–3
-
t
time s
-
v
velocity m s–1
-
x, z
cartesian coordinates m
- 
compressibiliy of sediment m2N–1
-
L
longitudinal dispersivity m
-
effective porosity (decimal fraction)
-
density kg m–3
-
s
density of sediment kg m–3
-
w
density of water kg m–3
-
decay constant per s
-
kinematic viscosity m2s–1 |
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| Keywords: | Subseabed disposal Consolidation Transport |
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