Influence of SIC control rod material on the iodine release in case of nuclear severe accident – Chemical reactivity with fission products in thermal conditions of RCS - CNRS - Centre national de la recherche scientifique Access content directly
Journal Articles Annals of Nuclear Energy Year : 2021

Influence of SIC control rod material on the iodine release in case of nuclear severe accident – Chemical reactivity with fission products in thermal conditions of RCS

Abstract

The effect of Silver-Indium-Cadmiun (SIC) control rod on the transport of volatile fission products (I, Cs, Mo) in conditions of a Reactor Coolant System under NPP severe accident was investigated within three semi-integral tests in a thermal gradient tube. The experiments addressed separately the effect of each SIC element. Nature of transported and deposited species was investigated by ICP MS, ESEM-EDX, Raman Microspectrometry, XRD and XPS techniques. For the first time, numerous metallic molybdates involving SIC components were evidenced. The formation of such metallic molybdates competes with the formation of Cs-molybdate and may in certain conditions strongly reduce the scavenging effect of Mo towards Cs. As a result the nature of transported iodine can be strongly modified, compared to chemical systems involving only Mo, Cs and I. The data obtained are useful to guide what species have to be added in the thermodynamic database used in the SA simulation software.
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Dates and versions

hal-03536395 , version 1 (19-01-2022)

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Anne Cecile Gregoire, Sophie Sobanska, Calogero Tornabene, David Talaga, Anne-Sophie Mamede, et al.. Influence of SIC control rod material on the iodine release in case of nuclear severe accident – Chemical reactivity with fission products in thermal conditions of RCS. Annals of Nuclear Energy, 2021, 168, pp.108900. ⟨10.1016/j.anucene.2021.108900⟩. ⟨hal-03536395⟩
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