Abstract
Contribution to the understanding of iodine transport under primary circuit conditions: Csi/Cd and Csi/Ag interactions in condensed phase
Highlights
In the context of severe accident management, assessment of the involved phenomena has been the main objective of several scientific research programs for more than thirty years
The first experiments with caesium iodide (CsI-1 & CsI-2) were used as a blank to determine the fraction of gaseous iodine generated by heating caesium iodide powder under different atmosphere composition and temperature
When metallic silver was added to caesium iodide at 650 °C, the behaviour of caesium and iodine resembled the pure caesium iodide test conducted in the same conditions (CsI-3): the mass concentration of gaseous iodine decreased as the amount of hydrogen in the atmosphere was increased (Table 7)
Summary
In the context of severe accident management, assessment of the involved phenomena has been the main objective of several scientific research programs for more than thirty years. Important chemical reactions affecting directly or indirectly iodine chemistry, have been identified and are being studied in detail, so that their effects could be incorporated into accident analyses. Among the severe accident phenomena recommended for further study, the understanding of iodine chemistry has been defined as a high priority issue [3]. The role of Silver-Indium-Cadmium (SIC) control rods in the limitation of the release of gaseous iodine has been suspected. In the presence of boron carbide (B4C) as control rod material (i.e. the absence of SIC), approximately 85% of the iodine released into the containment was present in gaseous phase. In tests conducted with SIC control rods, this fraction did not exceed 2% [5,6]
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