EPMA-based mass balance method for quantitative fission product distribution comparison between TRISO particles

Karen E. Wright*, John D. Stempien, Isabella J. van Rooyen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Two irradiated AGR-2 TRISO particles were chosen to demonstrate a recently developed mass balance technique in which EPMA-generated concentration data were used to determine fission product mass on a layer-by-layer basis in TRISO particles. EPMA-calculated fission product masses for most fission products in the two particles were within ± 20% of their ORIGEN-modelled masses. Results show that Sr, Ba, and Eu accumulate preferentially in the carbon-rich kernel periphery on the particles’ side that lacks a gap between the buffer and IPyC. In addition, the more mobile elements—Cs, Sr, Pd, and Ag, accumulate in greater quantity in the outer layers of particle AGR2-223-RS34 compared to particle AGR2-223-RS06, which has relatively more of those elements’ mass located in the kernel and kernel periphery, suggesting enhanced fission product transport in particle AGR2-223-RS34. This model can be used better understand and test fission product transport in TRISO particles. Graphical abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)1020-1025
JournalMRS Advances
Volume6
Issue number47-48
DOIs
Publication statusPublished - 2022

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