Radiolytic Corrosion of Grain Boundaries onto the UO2 TRISO Particle Surface
Abstract
This work is dealing with the understanding
of the corrosion mechanisms at solid/solution
interface and taking into account for the
4
He
2+
ions irradiation effects on these mechanisms.
These corrosion and
4
He
2+
ions radiolysis phenomena append at solid/solution interface and
will be studied at a μmetric scale by the Raman spectroscopy. Moreover, a
4
He
2+
ions
irradiation affects a small low volume and allows
us to control the irradiated area (solution,
solid or interface). For the solid,
the chemical species induced by
4
He
2+
ions radiolysis of
water are reactive and are involved in
classical corrosion mechanisms of UO
2
. Moreover, we
want to study the impact of the
4
He
2+
ions radiolysis of water
layers physisorbed into the
surface onto corrosion mechanisms. That is the
reason why we want to
use a local irradiation,
allowed by the
4
He
2+
ions ion beam provided by the
ARRONAX cyclotron (E = 64.7 MeV).
In this work an experimental apparatus wi
ll be performed in order to characterize
solid/solution interface at μmet
ric scale by Raman spectroscopy under
4
He
2+
ions irradiation
provided by the cyclotron ARRONAX facility.
The leaching experiments under irradiation
will be performed for a short time in order to
study the parameters during the fast instant
release step. The grain boundaries effect w
ill be studied by the comparison between one
TRISO particles set (solids with grain boundari
es) and one TRISO par
ticles set previously
washed by one acid solution (solid wit
hout grain boundaries). The role of H
2
will be studied
by the comparison between experiments under Ar or Ar/H
2
atmosphere. The dose rate range
will be between 0 and 100 Gy/min by using the al
pha ion beam which let us control the dose
set down into the sample. For all these experiments, measurements will be performed by the
in situ
Raman spectroscopy during the irra
diation in order to follow the
formation/consumption of the secondary phase
s formed onto the solid. The SEM will be
performed in order to characte
rize the grain boundaries and th
e secondary phases formed by
the leaching/irradiation experiments.
The μGC is used to measure the P
H2
into the irradiation
cell to follow the production/c
onsumption of this gaseous species formed by the water
radiolysis and consumed
by the leaching process.
Domains
RadiochemistryOrigin | Files produced by the author(s) |
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