TY - CHAP
T1 - Release of Radioactive Materials from a Degrading Core (RADECO)
T2 - RADECO summary report
AU - Kekki, Tommi
AU - Zilliacus, Riitta
AU - Lipponen, Maija
PY - 2011
Y1 - 2011
N2 - The deposition of IOx particles on painted concrete
samples and the study on iodine desorption from IOx
particle deposition was a joint effort between RADECO and
CHEMPC projects. The experiments with iodine oxide
deposition on painted concrete, showed some release of
gaseous iodine. The desorption of iodine was enhanced on
newly painted surface. According to these experiments the
formation of the organic iodine is very limited. However,
some migration of iodine on the surfaces may be possible
by sequential revolatilization and re-trapping. Further
experiments would be needed at higher temperature, at
high humidity and with different representative surfaces
such as metals, paints and cable jacket materials.
Nitric acid is a principal radiolytic compound produced
in large, and its production is another important problem
concerning pH of solutions, owing to its chemical
properties of being a strong acid and a strong oxidizing
agent. The G value was determined for nitric acid formed
from air and for the nitric acid formed from the water.
G-value calculated of these moist air results is 2.42
parallel experiments gave G-value 2.32. The determination
of G-value for NO3 formation of water in radiation gave
G-value 0.024. A preliminary experiment to study the
influence of painted surface in the nitrate concentration
was made by irradiating water with and without painted
concrete block. The preliminary results with the 2.6 kGy
dose gave 4 times more nitrate into the water than in
blank case.
AB - The deposition of IOx particles on painted concrete
samples and the study on iodine desorption from IOx
particle deposition was a joint effort between RADECO and
CHEMPC projects. The experiments with iodine oxide
deposition on painted concrete, showed some release of
gaseous iodine. The desorption of iodine was enhanced on
newly painted surface. According to these experiments the
formation of the organic iodine is very limited. However,
some migration of iodine on the surfaces may be possible
by sequential revolatilization and re-trapping. Further
experiments would be needed at higher temperature, at
high humidity and with different representative surfaces
such as metals, paints and cable jacket materials.
Nitric acid is a principal radiolytic compound produced
in large, and its production is another important problem
concerning pH of solutions, owing to its chemical
properties of being a strong acid and a strong oxidizing
agent. The G value was determined for nitric acid formed
from air and for the nitric acid formed from the water.
G-value calculated of these moist air results is 2.42
parallel experiments gave G-value 2.32. The determination
of G-value for NO3 formation of water in radiation gave
G-value 0.024. A preliminary experiment to study the
influence of painted surface in the nitrate concentration
was made by irradiating water with and without painted
concrete block. The preliminary results with the 2.6 kGy
dose gave 4 times more nitrate into the water than in
blank case.
M3 - Chapter or book article
SN - 978-951-38-7689-0
T3 - VTT Tiedotteita - Research Notes
SP - 295
EP - 300
BT - SAFIR2010
PB - VTT Technical Research Centre of Finland
CY - Espoo
ER -