Experimental assessment of chemical stability of waste-forms containing OPC and SAC cement and a novel radioactive waste, 10B enriched boric acid

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عنوان دوره: اولین دوره بین المللی و بیست و هشتمین دوره ملی (1400)
Due to the technical capabilities of enriched boric acid (EBA) compared to normal/natural boric acid (NBA), some pioneer nuclear power plants have started to apply EBA instead of NBA, as a novel neutron absorber. The volume of EBA-radwastes is increasing while there is no available data about the conditioning of EBA waste streams. The significant mass difference between the stable isotopes of boron (10B/11B) and also the pH dependence of borate molecules’ geometries are expected to cause varied behaviors of NBA and EBA in cementitious matrices which can influence the chemical stability and durability of their final waste-forms. This is the first study to prove this phenomenon by providing XRD, SEM, ICP-OES, and ICP-MS data about leaching tests on OPC and SAC cement pastes containing NBA/EBA. The results showed that the cement pastes prepared with EBA have different mineralogy and varied boron-leachabilities compared to the specimens prepared with NBA.
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