EPMA-Based Mass Balance Method for Quantitative Fission Product Distribution Comparison between TRISO Particles

Journal Article · 03 February 2022 · MRS Advances (Online)

DOI: https://doi.org/10.1557/s43580-021-00166-2 · OSTI ID:1872988

Wright, Karen E.  ^[1]; Stempien, John D  ^[1]; Van Rooyen, Isabella J  ^[1]

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1. Idaho National Lab. (INL), Idaho Falls, ID (United States)

Two irradiated AGR-2 TRISO particles were chosen to demonstrate a recently developed mass balance technique in which EPMA-generated concentration data was 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, and Pd, 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.

• Research Organization: Idaho National Laboratory (INL), Idaho Falls, ID (United States)
• Sponsoring Organization: USDOE National Scientific Users Facility (NSUF); USDOE Office of Nuclear Energy (NE)
• Grant/Contract Number: AC07-05ID14517
• OSTI ID: 1872988
• Report Number(s): INL/JOU-21-64074-Rev000
• Journal Information: MRS Advances (Online), Journal Name: MRS Advances (Online) Journal Issue: 47-48 Vol. 6; ISSN 2731-5894
• Publisher: Springer NatureCopyright Statement
• Country of Publication: United States
• Language: English