Measurement of kernel swelling and buffer densification in irradiated UCO-TRISO particles

Radiation-induced volume changes in the fuel kernels and buffer layers of UCO-TRISO particles irradiated to an average burnup of 16.1% FIMA have been determined. Measurements of particle dimensions were made on polished cross-sections of 56 irradiated particles at several different polish planes. Th...

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Bibliographic Details
Published in:Journal of nuclear materials 2017-04, Vol.486 (C), p.339-349
Main Authors: Bower, Gordon R., Ploger, Scott A., Demkowicz, Paul A., Hunn, John D.
Format: Article
Language:English
Subjects:
Advanced Gas Reactor (AGR)
Buffer layers
Buffers
Ceramography
Coated particle fuel
Data processing
Densification
fuel
Fuel swelling
Fuels
ilicon carbide
Irradiation
Kernels
Maximum likelihood estimation
Measurement
Measurement uncertainty
NUCLEAR FUEL CYCLE AND FUEL MATERIALS
Particulates
Planes
Polishes
Post-irradiation examination
Radiation
Radiation effects
TRISO
Volume
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Summary:Radiation-induced volume changes in the fuel kernels and buffer layers of UCO-TRISO particles irradiated to an average burnup of 16.1% FIMA have been determined. Measurements of particle dimensions were made on polished cross-sections of 56 irradiated particles at several different polish planes. The data were then analyzed to compute the equivalent spherical diameters of the kernels and the various coating layers, and these were compared to the average as-fabricated values to determine changes due to irradiation. The kernel volume was found to have increased by an average of 26 ± 6%. Buffer volume decreased by an average of 39 ± 2% due to densification.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2017.01.006