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

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