| 1. |
- Börjesson Sandén, Fredrik, 1995, et al.
(author)
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Effects of boric acid on volatile tellurium in severe accident conditions
- 2024
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In: Annals of Nuclear Energy. - 0306-4549 .- 1873-2100. ; 200
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Journal article (peer-reviewed)abstract
- Boric acid is used in light-water nuclear reactors to control the reactor and is expected to be present as part of the chemistry of a severe accident. Therefore, its influence on other prominent species expected in an accident must be investigated. One such species is tellurium. In the present study, tellurium is volatized, and boric acid is dissolved and injected into the system as a means of studying the interaction between it and tellurium. The experiments were evaluated with ICP-MS and XPS. Results suggest that while there is no direct interaction, boric acid still affects the tendency for tellurium to oxidize. In general, less oxidation was detected in the presence of boric acid than in its absence, especially at high temperatures. The species formed upon oxidation was determined to be TeO2. Since tellurium metal is more volatile than TeO2, this may have implication in a wider severe accident context.
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| 2. |
- Pasi, Anna-Elina, 1993, et al.
(author)
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Gas phase interactions between tellurium and organic material in severe nuclear accident scenarios
- 2024
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In: Annals of Nuclear Energy. - 0306-4549 .- 1873-2100. ; 197
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Journal article (peer-reviewed)abstract
- One of the volatile fission products potentially released during a severe nuclear accident is tellurium. Recently, tellurium has been shown to form volatile organic tellurides from paint solvents in aqueous solutions which could further increase the release. However, not much is known about the possible interactions between tellurium and organic material in gas phase. In this study, tellurium was exposed to conditions simulating the containment atmosphere during an accident. Moreover, volatile organic compounds were introduced to the gas phase representing the presence of organic material in the containment during the accident. The results suggest that tellurium aerosols and organic material interact in the gas phase which was observed as an increase in the gaseous fraction and a change in the XPS spectra. Although no exact species were identified, the results raise questions about the behavior of tellurium in severe accident conditions, especially, regarding the reactions involving organic material.
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