Microstructural analysis of TRISO particles using multi-scale X-ray computed tomography
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Authors
Lowe, Tristan
Yue, Sheng

Bari, Klaudio

Gelb, Jeff
Rohbeck, Nadia

Turner, Joel

Withers, Philip

Affiliation
University of DerbyIssue Date
2015-06
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TRISO particles, a composite nuclear fuel built up by ceramic and graphitic layers, have outstanding high temperature resistance. TRISO fuel is the key technology for High Temperature Reactors (HTRs) and the Generation IV Very High Temperature Reactor (VHTR) variant. TRISO offers unparalleled containment of fission products and is extremely robust during accident conditions. An understanding of the thermal performance and mechanical properties of TRISO fuel requires a detailed knowledge of pore sizes, their distribution and interconnectivity. Here 50 nm, nano-, and 1 μm resolution, micro-computed tomography (CT), have been used to quantify non-destructively porosity of a surrogate TRISO particle at the 0.3–10 μm and 3–100 μm scales respectively. This indicates that pore distributions can reliably be measured down to a size approximately 3 times the pixel size which is consistent with the segmentation process. Direct comparison with Scanning Electron Microscopy (SEM) sections indicates that destructive sectioning can introduce significant levels of coarse damage, especially in the pyrolytic carbon layers. Further comparative work is required to identify means of minimizing such damage for SEM studies. Finally since it is non-destructive, multi-scale time-lapse X-ray CT opens the possibility of intermittently tracking the degradation of TRISO structure under thermal cycles or radiation conditions in order to validate models of degradation such as kernel movement. X-ray CT in-situ experimentation of TRISO particles under load and temperature could also be used to understand the internal changes that occur in the particles under accident conditions.Citation
Lowe, T. et al (2015) 'Microstructural analysis of TRISO particles using multi-scale X-ray computed tomography' Journal of Nuclear Materials, 461:29Publisher
ElsevierJournal
Journal of Nuclear MaterialsDOI
10.1016/j.jnucmat.2015.02.034Additional Links
http://linkinghub.elsevier.com/retrieve/pii/S0022311515001294Type
ArticleLanguage
enISSN
0022-3115ae974a485f413a2113503eed53cd6c53
10.1016/j.jnucmat.2015.02.034
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Except where otherwise noted, this item's license is described as Archived with thanks to Journal of Nuclear Materials