Recent studies on fission products behaviour in a severe accident

Mélany Gouëllo, Teemu Kärkelä, Jouni Hokkinen, Jarmo Kalilainen, Ari Auvinen

Research output: Contribution to conferenceConference articleScientific

Abstract

Brief presentation of the research lead at VTT on fission products transport and chemistry was made, and focus was made on the behaviour of FPs in the primary circuit piping. Starting from the observation of a significant fraction of gaseous iodine in the containment during some Phébus-FP tests, hypotheses concerning reactions from caesium iodide, which can modify the transport of iodine, were presented. Focus was on {Cs-I-O-H} system and the influence that may have molybdenum and boron. Experimental works, performed at IRSN, on the study of the chemical reactions on the gas stream and performed at VTT, on chemical reactions on the surfaces of the pipe walls were shown. The influence of the two elements, acting as caesium consumers in both gaseous and condensed phased, was demonstrated. Moreover, comparative study between experimental results and calculations obtained with SOPHAEROS, module of ASTEC code, was made for the experiments done in gaseous phase. Role of possible {Cs, I, O, H} kinetic reactions was pointed out.
Original languageEnglish
Publication statusPublished - 2015
EventCLADS Decommissioning Workshop - International Collaboration Toward Advanced Decommissioning of Fukushima-Daiichi NPP - Ibaraki, Japan
Duration: 9 Nov 201512 Nov 2015

Workshop

WorkshopCLADS Decommissioning Workshop - International Collaboration Toward Advanced Decommissioning of Fukushima-Daiichi NPP
CountryJapan
CityIbaraki
Period9/11/1512/11/15

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Keywords

  • fission products
  • RCS
  • iodine
  • nuclear severe accident

Cite this

Gouëllo, M., Kärkelä, T., Hokkinen, J., Kalilainen, J., & Auvinen, A. (2015). Recent studies on fission products behaviour in a severe accident. Paper presented at CLADS Decommissioning Workshop - International Collaboration Toward Advanced Decommissioning of Fukushima-Daiichi NPP, Ibaraki, Japan.