Fission product speciation in phebus tests FPT0 and FPT1 and the possible influence of boron [report]

O. Götzmann
1996
Fission Product Speciation in Phebus Tests FPTO and FPT1 and the Possible lnfluence of Boron The thermochemical calculations performed with a large number of elements to describe the chemical system in a Phebus FP test allow the following conclusions: The metallic absorber materials play a significant role in fission product speciation. At around 1 ooooc and above, silver iodide is the dominant iodine carrier in a full steam atmosphere in both FPTO and FPT1. At lower temperatures, cadmium
more » ... ures, cadmium iodide takes over. ln a reduced environment, indium iodide becomes important. Caesium iodide does certainly appear; at certain test conditions it becomes the major iodine transporting vehicle. But its role is not greater than that of the other iodides. lt has more chances in FPT1 than in FPTO. Chlorine, which was present in FPTO as a contaminant in relatively large amounts, does not prevent the iodine from forming Csl. 8oth share the caesium like partners. The evolution of caesium chloride and iodide proceeds in parallel. When CsCI is
doi:10.5445/ir/270038917 fatcat:stycd3h27vhk5luuvdimmtw4wy