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Effect of stress evolution on microstructural behavior in U-Mo/Al dispersion fuel

Author(s)
Jeong, G.Y.Kim, Yeon SooJamison, L.M.Robinson, A.B.Lee, K.H.Sohn, Dong-Seong
Issued Date
2017-04
DOI
10.1016/j.jnucmat.2017.02.023
URI
https://scholarworks.unist.ac.kr/handle/201301/21595
Fulltext
http://www.sciencedirect.com/science/article/pii/S0022311516308467
Citation
JOURNAL OF NUCLEAR MATERIALS, v.487, pp.265 - 279
Abstract
U-Mo/Al dispersion fuel irradiated to high burnup at high power (high fission rate) exhibited microstructural changes including deformation of the fuel particles, pore growth, and rupture of the Al matrix. The driving force for these microstructural changes was meat swelling resulting from a combination of fuel particle swelling and interaction layer (IL) growth. In some cases, pore growth in the interaction layers also contributed to meat swelling. The main objective of this work was to determine the stress distribution within the fuel meat that caused these phenomena. A mechanical equilibrium between the stress generated by fuel meat swelling and the stress relieved by fission-induced creep in the meat constituents (U-Mo particles, Al matrix, and IL) was considered. Test plates with well-recorded fabrication data and irradiation conditions were used, and their post-irradiation examination (PIE) data was obtained. ABAQUS finite element analysis (FEA) was utilized to simulate the microstructural evolution of the plates. The simulation results allowed for the determination of effective stress and hydrostatic stress exerted on the meat constituents. The effects of fabrication and irradiation parameters on the stress distribution that drives microstructural evolutions, such as pore growth in the IL and Al matrix rupture, were investigated.
Publisher
ELSEVIER SCIENCE BV
ISSN
0022-3115
Keyword (Author)
U-Mo/Al dispersion fuelIrradiation dataMicrostructural evolutionStress analysisABAQUS FEA simulation
Keyword
MO ALLOY FUELCENTRIFUGAL ATOMIZATIONIRRADIATION BEHAVIORPLATESCREEPDIFFUSIONALUMINUMFRACTUREELEMENTSPRODUCT

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