Experimental study on the reactions between cadmium and caesium iodide on the surface of primary circuit piping during a severe nuclear Accident

Mélany Gouëllo, Jarmo Kalilainen, Teemu Kärkelä, Pekka Rantanen, Ari Auvinen

Research output: Contribution to conferenceConference articleScientific

Abstract

In case of a severe accident in a pressurized water reactor (PWR), iodine is one of the most important fission products in the context of reactor safety because of its significant total fuel inventory, short half-life and radiotoxicity. Consequently, understanding its behaviour under severe accident transient conditions is a major point in the improvement of the accident management and mitigation measures. An experimental study has been launched at VTT Technical Research Centre of Finland to investigate the behaviour of iodine on primary circuit surfaces during a severe nuclear accident. The paper presents results obtained from the heating of metallic cadmium pellets and caesium iodide powder in a crucible 650°C under two different atmospheres (Ar/H2O and Ar/H2O/H2). Aerosols and gaseous species released from the reaction crucible were collected on filters and trapped in liquid scrubbers respectively and analysed with XRD and ICP-MS. The first experiments were conducted as blank tests to have a sort of baseline for the cadmium and caesium/iodine behaviour in the same conditions. In the following experiments, caesium iodide and cadmium were both added in the crucible. While it was expected that cadmium reacts with iodine forming cadmium iodide, this compound was not detected in the post-test analyses. However, it was shown that the transport of cadmium was enhanced by the presence of caesium iodide, by condensing on caesium iodide particles, particularly in Ar/H2O/H2 atmosphere.
Original languageEnglish
Number of pages11
Publication statusPublished - 2015
Event7th European Review Meeting on Severe Accidents Research, ERMSAR 2015 - Marseille, France
Duration: 24 Mar 201526 Mar 2015

Conference

Conference7th European Review Meeting on Severe Accidents Research, ERMSAR 2015
CountryFrance
CityMarseille
Period24/03/1526/03/15

Fingerprint

Cesium iodide
Cadmium
Accidents
Iodine
Networks (circuits)
Crucibles
Scrubbers
Fission products
Pressurized water reactors
Cesium
Aerosols
Experiments
Heating
Powders
Liquids

Keywords

  • primary circuit
  • iodine
  • cadmium
  • severe accident

Cite this

Gouëllo, M., Kalilainen, J., Kärkelä, T., Rantanen, P., & Auvinen, A. (2015). Experimental study on the reactions between cadmium and caesium iodide on the surface of primary circuit piping during a severe nuclear Accident. Paper presented at 7th European Review Meeting on Severe Accidents Research, ERMSAR 2015, Marseille, France.
Gouëllo, Mélany ; Kalilainen, Jarmo ; Kärkelä, Teemu ; Rantanen, Pekka ; Auvinen, Ari. / Experimental study on the reactions between cadmium and caesium iodide on the surface of primary circuit piping during a severe nuclear Accident. Paper presented at 7th European Review Meeting on Severe Accidents Research, ERMSAR 2015, Marseille, France.11 p.
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abstract = "In case of a severe accident in a pressurized water reactor (PWR), iodine is one of the most important fission products in the context of reactor safety because of its significant total fuel inventory, short half-life and radiotoxicity. Consequently, understanding its behaviour under severe accident transient conditions is a major point in the improvement of the accident management and mitigation measures. An experimental study has been launched at VTT Technical Research Centre of Finland to investigate the behaviour of iodine on primary circuit surfaces during a severe nuclear accident. The paper presents results obtained from the heating of metallic cadmium pellets and caesium iodide powder in a crucible 650°C under two different atmospheres (Ar/H2O and Ar/H2O/H2). Aerosols and gaseous species released from the reaction crucible were collected on filters and trapped in liquid scrubbers respectively and analysed with XRD and ICP-MS. The first experiments were conducted as blank tests to have a sort of baseline for the cadmium and caesium/iodine behaviour in the same conditions. In the following experiments, caesium iodide and cadmium were both added in the crucible. While it was expected that cadmium reacts with iodine forming cadmium iodide, this compound was not detected in the post-test analyses. However, it was shown that the transport of cadmium was enhanced by the presence of caesium iodide, by condensing on caesium iodide particles, particularly in Ar/H2O/H2 atmosphere.",
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Gouëllo, M, Kalilainen, J, Kärkelä, T, Rantanen, P & Auvinen, A 2015, 'Experimental study on the reactions between cadmium and caesium iodide on the surface of primary circuit piping during a severe nuclear Accident' Paper presented at 7th European Review Meeting on Severe Accidents Research, ERMSAR 2015, Marseille, France, 24/03/15 - 26/03/15, .

Experimental study on the reactions between cadmium and caesium iodide on the surface of primary circuit piping during a severe nuclear Accident. / Gouëllo, Mélany; Kalilainen, Jarmo; Kärkelä, Teemu; Rantanen, Pekka; Auvinen, Ari.

2015. Paper presented at 7th European Review Meeting on Severe Accidents Research, ERMSAR 2015, Marseille, France.

Research output: Contribution to conferenceConference articleScientific

TY - CONF

T1 - Experimental study on the reactions between cadmium and caesium iodide on the surface of primary circuit piping during a severe nuclear Accident

AU - Gouëllo, Mélany

AU - Kalilainen, Jarmo

AU - Kärkelä, Teemu

AU - Rantanen, Pekka

AU - Auvinen, Ari

N1 - Published on SARnet website only. Project code: 101862

PY - 2015

Y1 - 2015

N2 - In case of a severe accident in a pressurized water reactor (PWR), iodine is one of the most important fission products in the context of reactor safety because of its significant total fuel inventory, short half-life and radiotoxicity. Consequently, understanding its behaviour under severe accident transient conditions is a major point in the improvement of the accident management and mitigation measures. An experimental study has been launched at VTT Technical Research Centre of Finland to investigate the behaviour of iodine on primary circuit surfaces during a severe nuclear accident. The paper presents results obtained from the heating of metallic cadmium pellets and caesium iodide powder in a crucible 650°C under two different atmospheres (Ar/H2O and Ar/H2O/H2). Aerosols and gaseous species released from the reaction crucible were collected on filters and trapped in liquid scrubbers respectively and analysed with XRD and ICP-MS. The first experiments were conducted as blank tests to have a sort of baseline for the cadmium and caesium/iodine behaviour in the same conditions. In the following experiments, caesium iodide and cadmium were both added in the crucible. While it was expected that cadmium reacts with iodine forming cadmium iodide, this compound was not detected in the post-test analyses. However, it was shown that the transport of cadmium was enhanced by the presence of caesium iodide, by condensing on caesium iodide particles, particularly in Ar/H2O/H2 atmosphere.

AB - In case of a severe accident in a pressurized water reactor (PWR), iodine is one of the most important fission products in the context of reactor safety because of its significant total fuel inventory, short half-life and radiotoxicity. Consequently, understanding its behaviour under severe accident transient conditions is a major point in the improvement of the accident management and mitigation measures. An experimental study has been launched at VTT Technical Research Centre of Finland to investigate the behaviour of iodine on primary circuit surfaces during a severe nuclear accident. The paper presents results obtained from the heating of metallic cadmium pellets and caesium iodide powder in a crucible 650°C under two different atmospheres (Ar/H2O and Ar/H2O/H2). Aerosols and gaseous species released from the reaction crucible were collected on filters and trapped in liquid scrubbers respectively and analysed with XRD and ICP-MS. The first experiments were conducted as blank tests to have a sort of baseline for the cadmium and caesium/iodine behaviour in the same conditions. In the following experiments, caesium iodide and cadmium were both added in the crucible. While it was expected that cadmium reacts with iodine forming cadmium iodide, this compound was not detected in the post-test analyses. However, it was shown that the transport of cadmium was enhanced by the presence of caesium iodide, by condensing on caesium iodide particles, particularly in Ar/H2O/H2 atmosphere.

KW - primary circuit

KW - iodine

KW - cadmium

KW - severe accident

M3 - Conference article

ER -

Gouëllo M, Kalilainen J, Kärkelä T, Rantanen P, Auvinen A. Experimental study on the reactions between cadmium and caesium iodide on the surface of primary circuit piping during a severe nuclear Accident. 2015. Paper presented at 7th European Review Meeting on Severe Accidents Research, ERMSAR 2015, Marseille, France.