Release of Radioactive Materials from a Degrading Core (RADECO)

RADECO summary report

Tommi Kekki, Riitta Zilliacus, Maija Lipponen

Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

Abstract

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.
Original languageEnglish
Title of host publicationSAFIR2010
Subtitle of host publicationThe Finnish Research Programme on Safety 2007-2010: Final Report
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages295-300
ISBN (Electronic)978-951-38-7690-6
ISBN (Print)978-951-38-7689-0
Publication statusPublished - 2011
MoE publication typeNot Eligible

Publication series

NameVTT Tiedotteita - Research Notes
PublisherVTT
Number2571
ISSN (Print)1235-0605
ISSN (Electronic)1455-0865

Fingerprint

iodine
nitric acid
experiment
desorption
nitrate
water
air
cable
trapping
material
chemical property
humidity
oxide
acid
metal

Cite this

Kekki, T., Zilliacus, R., & Lipponen, M. (2011). Release of Radioactive Materials from a Degrading Core (RADECO): RADECO summary report. In SAFIR2010: The Finnish Research Programme on Safety 2007-2010: Final Report (pp. 295-300). Espoo: VTT Technical Research Centre of Finland. VTT Tiedotteita - Research Notes, No. 2571
Kekki, Tommi ; Zilliacus, Riitta ; Lipponen, Maija. / Release of Radioactive Materials from a Degrading Core (RADECO) : RADECO summary report. SAFIR2010: The Finnish Research Programme on Safety 2007-2010: Final Report. Espoo : VTT Technical Research Centre of Finland, 2011. pp. 295-300 (VTT Tiedotteita - Research Notes; No. 2571).
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Kekki, T, Zilliacus, R & Lipponen, M 2011, Release of Radioactive Materials from a Degrading Core (RADECO): RADECO summary report. in SAFIR2010: The Finnish Research Programme on Safety 2007-2010: Final Report. VTT Technical Research Centre of Finland, Espoo, VTT Tiedotteita - Research Notes, no. 2571, pp. 295-300.

Release of Radioactive Materials from a Degrading Core (RADECO) : RADECO summary report. / Kekki, Tommi; Zilliacus, Riitta; Lipponen, Maija.

SAFIR2010: The Finnish Research Programme on Safety 2007-2010: Final Report. Espoo : VTT Technical Research Centre of Finland, 2011. p. 295-300 (VTT Tiedotteita - Research Notes; No. 2571).

Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

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 -

Kekki T, Zilliacus R, Lipponen M. Release of Radioactive Materials from a Degrading Core (RADECO): RADECO summary report. In SAFIR2010: The Finnish Research Programme on Safety 2007-2010: Final Report. Espoo: VTT Technical Research Centre of Finland. 2011. p. 295-300. (VTT Tiedotteita - Research Notes; No. 2571).