Recent advances on containment iodine chemistry

S. Dickinson (Corresponding Author), F. Andreo, Teemu Kärkelä, J. Ball, L. Bosland, L. Cantrel, F. Funke, N. Girault, J. Holm, S. Guilbert, L. E. Herranz, C. Housiadas, G. Ducros, C. Mun, J.-C. Sabroux, G. Weber

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Abstract

The 5th FWP EURSAFE Project highlighted iodine chemistry in the containment as one of the issues requiring further research in order to reduce source term uncertainties. Consequently, a series of studies was launched in the 6th FWP SARNET Project aimed at improving the predictability of iodine behaviour during severe accidents via a better understanding of the complex chemical phenomena in the containment. In particular, SARNET has striven to foster common interpretation of integral and separate effect test data, production of new or improved models where necessary, and compilation of the existing knowledge of the subject. The work has been based on a substantial amount of experimental information made available from bench-scale projects (PARIS and EPICUR), via intermediate-scale tests (CAIMAN) to large-scale facilities (SISYPHE, THAI and PHEBUS-FP). In the experimental field, particular attention has been paid to two specific issues: the effects of radiation on both aqueous and gaseous iodine chemistry, and the mass transfer of iodine between aqueous and gaseous phases. Comparisons between calculations and results of the EPICUR and CAIMAN experiments suggest that the aqueous phase chemistry is reasonably well understood, although there are still some areas of uncertainty. Interpretation of integral experiments, like PHEBUS-FPT2, indicated that radiation-induced conversion of molecular iodine into particulate species (IxOy) could be responsible for the gaseous iodine depletion observed in the long-term. However, the results of much simpler, small-scale experiments have shown that further improvements in understanding and modelling are still needed. Mass transfer modelling has been extended to cover evaporating sump conditions based on SISYPHE data; however, application of this model to the larger scale THAI experiments seems not to be straightforward. In addition to these two major issues, some specific studies have been carried out concerning the potential effect of passive autocatalytic hydrogen recombiners on iodine volatility. The RECI analytical experiments have shown that metal iodides (namely CsI and CdI2) are not stable and yield gaseous iodine when heated, in a humid atmosphere, at temperatures representative of recombiner operation. Another important undertaking successfully carried out has been the compilation of an Iodine Data Book, which provides a critical review of the experimental data and modelling approaches that have been used in the development of iodine source term methodologies. This should assist in a proper use of such models, and inform their future development.
Original languageEnglish
Pages (from-to)128-135
Number of pages8
JournalProgress in Nuclear Energy
Volume52
Issue number1
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed
Event3rd European Review Meeting on Severe Accident Research, ERMSAR 2008 - Nesseber, Bulgaria
Duration: 1 Sep 2008 → …

Fingerprint

iodine
containment
Iodine
experiment
Experiments
mass transfer
Mass transfer
chemical phenomena
modeling
Radiation
iodide
accident
Accidents
hydrogen
Hydrogen
methodology
atmosphere
metal

Keywords

  • Containment
  • Iodine Chemistry
  • LWR Severe Accident

Cite this

Dickinson, S., Andreo, F., Kärkelä, T., Ball, J., Bosland, L., Cantrel, L., ... Weber, G. (2010). Recent advances on containment iodine chemistry. Progress in Nuclear Energy, 52(1), 128-135. https://doi.org/10.1016/j.pnucene.2009.09.009
Dickinson, S. ; Andreo, F. ; Kärkelä, Teemu ; Ball, J. ; Bosland, L. ; Cantrel, L. ; Funke, F. ; Girault, N. ; Holm, J. ; Guilbert, S. ; Herranz, L. E. ; Housiadas, C. ; Ducros, G. ; Mun, C. ; Sabroux, J.-C. ; Weber, G. / Recent advances on containment iodine chemistry. In: Progress in Nuclear Energy. 2010 ; Vol. 52, No. 1. pp. 128-135.
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Dickinson, S, Andreo, F, Kärkelä, T, Ball, J, Bosland, L, Cantrel, L, Funke, F, Girault, N, Holm, J, Guilbert, S, Herranz, LE, Housiadas, C, Ducros, G, Mun, C, Sabroux, J-C & Weber, G 2010, 'Recent advances on containment iodine chemistry', Progress in Nuclear Energy, vol. 52, no. 1, pp. 128-135. https://doi.org/10.1016/j.pnucene.2009.09.009

Recent advances on containment iodine chemistry. / Dickinson, S. (Corresponding Author); Andreo, F.; Kärkelä, Teemu; Ball, J.; Bosland, L.; Cantrel, L.; Funke, F.; Girault, N.; Holm, J.; Guilbert, S.; Herranz, L. E.; Housiadas, C.; Ducros, G.; Mun, C.; Sabroux, J.-C.; Weber, G.

In: Progress in Nuclear Energy, Vol. 52, No. 1, 2010, p. 128-135.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Recent advances on containment iodine chemistry

AU - Dickinson, S.

AU - Andreo, F.

AU - Kärkelä, Teemu

AU - Ball, J.

AU - Bosland, L.

AU - Cantrel, L.

AU - Funke, F.

AU - Girault, N.

AU - Holm, J.

AU - Guilbert, S.

AU - Herranz, L. E.

AU - Housiadas, C.

AU - Ducros, G.

AU - Mun, C.

AU - Sabroux, J.-C.

AU - Weber, G.

PY - 2010

Y1 - 2010

N2 - The 5th FWP EURSAFE Project highlighted iodine chemistry in the containment as one of the issues requiring further research in order to reduce source term uncertainties. Consequently, a series of studies was launched in the 6th FWP SARNET Project aimed at improving the predictability of iodine behaviour during severe accidents via a better understanding of the complex chemical phenomena in the containment. In particular, SARNET has striven to foster common interpretation of integral and separate effect test data, production of new or improved models where necessary, and compilation of the existing knowledge of the subject. The work has been based on a substantial amount of experimental information made available from bench-scale projects (PARIS and EPICUR), via intermediate-scale tests (CAIMAN) to large-scale facilities (SISYPHE, THAI and PHEBUS-FP). In the experimental field, particular attention has been paid to two specific issues: the effects of radiation on both aqueous and gaseous iodine chemistry, and the mass transfer of iodine between aqueous and gaseous phases. Comparisons between calculations and results of the EPICUR and CAIMAN experiments suggest that the aqueous phase chemistry is reasonably well understood, although there are still some areas of uncertainty. Interpretation of integral experiments, like PHEBUS-FPT2, indicated that radiation-induced conversion of molecular iodine into particulate species (IxOy) could be responsible for the gaseous iodine depletion observed in the long-term. However, the results of much simpler, small-scale experiments have shown that further improvements in understanding and modelling are still needed. Mass transfer modelling has been extended to cover evaporating sump conditions based on SISYPHE data; however, application of this model to the larger scale THAI experiments seems not to be straightforward. In addition to these two major issues, some specific studies have been carried out concerning the potential effect of passive autocatalytic hydrogen recombiners on iodine volatility. The RECI analytical experiments have shown that metal iodides (namely CsI and CdI2) are not stable and yield gaseous iodine when heated, in a humid atmosphere, at temperatures representative of recombiner operation. Another important undertaking successfully carried out has been the compilation of an Iodine Data Book, which provides a critical review of the experimental data and modelling approaches that have been used in the development of iodine source term methodologies. This should assist in a proper use of such models, and inform their future development.

AB - The 5th FWP EURSAFE Project highlighted iodine chemistry in the containment as one of the issues requiring further research in order to reduce source term uncertainties. Consequently, a series of studies was launched in the 6th FWP SARNET Project aimed at improving the predictability of iodine behaviour during severe accidents via a better understanding of the complex chemical phenomena in the containment. In particular, SARNET has striven to foster common interpretation of integral and separate effect test data, production of new or improved models where necessary, and compilation of the existing knowledge of the subject. The work has been based on a substantial amount of experimental information made available from bench-scale projects (PARIS and EPICUR), via intermediate-scale tests (CAIMAN) to large-scale facilities (SISYPHE, THAI and PHEBUS-FP). In the experimental field, particular attention has been paid to two specific issues: the effects of radiation on both aqueous and gaseous iodine chemistry, and the mass transfer of iodine between aqueous and gaseous phases. Comparisons between calculations and results of the EPICUR and CAIMAN experiments suggest that the aqueous phase chemistry is reasonably well understood, although there are still some areas of uncertainty. Interpretation of integral experiments, like PHEBUS-FPT2, indicated that radiation-induced conversion of molecular iodine into particulate species (IxOy) could be responsible for the gaseous iodine depletion observed in the long-term. However, the results of much simpler, small-scale experiments have shown that further improvements in understanding and modelling are still needed. Mass transfer modelling has been extended to cover evaporating sump conditions based on SISYPHE data; however, application of this model to the larger scale THAI experiments seems not to be straightforward. In addition to these two major issues, some specific studies have been carried out concerning the potential effect of passive autocatalytic hydrogen recombiners on iodine volatility. The RECI analytical experiments have shown that metal iodides (namely CsI and CdI2) are not stable and yield gaseous iodine when heated, in a humid atmosphere, at temperatures representative of recombiner operation. Another important undertaking successfully carried out has been the compilation of an Iodine Data Book, which provides a critical review of the experimental data and modelling approaches that have been used in the development of iodine source term methodologies. This should assist in a proper use of such models, and inform their future development.

KW - Containment

KW - Iodine Chemistry

KW - LWR Severe Accident

U2 - 10.1016/j.pnucene.2009.09.009

DO - 10.1016/j.pnucene.2009.09.009

M3 - Article

VL - 52

SP - 128

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JO - Progress in Nuclear Energy

JF - Progress in Nuclear Energy

SN - 0149-1970

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ER -