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Reactivity study on iodine transported in a H2/H2O mixture under combustion conditions in premixed low-pressure flames

Yathis Délicat has defended his thesis on 5th June 2012.

Document type > *Mémoire/HDR/Thesis

Keywords >

Research Unit > IRSN/DPAM/SERCI/L2EC

Authors > DÉLICAT Yathis

Publication Date > 05/06/2012

Summary

To assess kinetics aspects of iodine chemistry in an environment of a severe accident in a Pressurized Water Reactor (PWR), at the laboratory scale, an experimental reactor "flat flame bruner" has been implemented. Low pressure flames of H2/O2/Ar premixed gas seeded with known amounts of iohydric acid and steam were studied. The quantification of chemical species (HI, H2O, OH) in such environment was obtained by specific analytical techniques (Fourier Transform InfraRed absorption spectrometry, FTIR and Laser Induced Fluorescence, LIF), the evolution of the temperature was determined by LIF and by thermocouple measurements. Further assays were performed in a flow reactor in which gaseous molecular iodine was injected and transported in a stream or hydrogen flow and a strong temperature gradient, representative of the primary circuit in the cas of a severe accident. The resulting gaseous species (I2 and HI) were quantified by ICP-MS and UV-Visible spectrometry. This experimental database has been used as a support to develop a detailed kinetic mechanism for the {I, O, H} system. It is composed of 37 reversible reactions involving 5 iodinated species. The thermokinetic parameter database has been actualized by using theoretical chemistry tools and also completed with data found in the literature. Modelling was performed by using the PREMIX code for flame assays, and with the IRSN's severe accident simulation code ASTEC/SOPHAREOS code for flow to reproduce the iodine chemistry in conditions representative of a PWR severe accident.

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