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| NKS Programme Area: | NKS-R | | Research Area: | Severe accidents | | Report Number: | NKS-500 | | Report Title: | NKS- Project TRIO; Tellurium, Iodine and Caesium Interactions with Boric Acid during a Nuclear Accident (2023-2024) | | Activity Acronym: | TRIO | | Authors: | Fredrik Börjesson Sandén, Anna-Elina Pasi, Teemu Kärkelä, Tuula Kajolinna, Christian Ekberg, | | Abstract: | Project TRIO was a project partially funded by NKS 2023-2024, and a joint collaboration between Chalmers University of Technology and VTT technical research institute in Finland. The project aim was to investigate if and how boric acid influences volatile fission product behaviour in severe nuclear accident-like conditions, with a special focus on tellurium. The project was split into two parts, with the first one investigating the influence of just tellurium and boric acid, and the other one also including vaporized Iodine, as well as caesium iodide. The experiments involved volatilization of tellurium into a carrier gas, into which boric acid solution was added. This yielded filters and liquid traps which were analysed, chiefly with ICP-MS and XPS and SEM-EDX. Online aerosol measurements (TEOM and ELPI) were also used.
The results imply that there is little direct interaction between tellurium and boric acid, as the Te-B chemical bond is never detected. However, boric acid decreases the tendency for tellurium to oxidize, and it is part of an interaction involving tellurium, iodine and boric acid all together which results in an increase in tellurium volatility by several orders of magnitude. | | Keywords: | Severe Nuclear Accidents, Tellurium, Iodine, Fission Products, Boric Acid | | Publication date: | 17 Apr 2025 | | ISBN: | 978-87-7893-598-4 | | Number of downloads: | 36 | | Download: |  NKS-500.pdf |
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