Highlights of experimental thermodynamics in the field of nuclear fuel development

Kleykamp, H.

doi:10.1016/j.jnucmat.2005.04.006

Cited by 12 publications

(1 citation statement)

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“…A few radionuclides form new oxide phases, consisting of Cs and Ba oxides, Xe and Kr trapped as gas bubbles, and metallic inclusion forms dominated by the elements Mo, Tc, Ru, Rh, and Pd. These 4d series of elements all have low oxygen affinities apart from Mo, which can act as an oxygen buffer in nuclear fuels [3]. These fission product alloys have also been recognized as good hydrogen catalysts.…”

Section: Introductionmentioning

confidence: 99%

Nanostructure of metallic particles in light water reactor used nuclear fuel

Buck

Mausolf

McNamara

et al. 2015

Journal of Nuclear Materials

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An extraordinary nano-structure has been observed in the metallic (Mo-Tc-Ru-Rh-Pd) particles that are known to form during irradiated in light water nuclear reactor fuels. This structure points possible high catalytic reactivity through the occurrence of a very high surface area as well as defect sites. We have analyzed separated metallic particles from dissolved high burn-up spent nuclear fuel using scanning and transmission electron microscopy. The larger particles vary in diameter between ~10 and ~300 nm and possess a hexagonally close packed epsilon-ruthenium structure. These particles are not always single crystals but often consist of much smaller crystallites on the order of 1-3 nm in diameter with evidence suggesting the occurrence of some amorphous regions. It is possible that neutron irradiation and fission product recoils generated the unusual small crystallite size. The composition of the metallic particles was variable with low levels of uranium present in some of the particles. We hypothesize that the uranium may have induced the formation of the amorphous (or frustrated) metal structure. This unique nanostructure may play an important role in the environmental behavior of nuclear fuels.

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Section: Introductionmentioning

confidence: 99%