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Energy & Environmental Science Vol - 4 Issue - 4

Energy & Environmental Science Vol - 4 Issue - 3

Energy & Environmental Science Vol - 4 Issue - 2

Energy & Environmental Science Vol -3

Energy & Environmental Science Vol -2

Energy & Environmental Science Vol -1

Nuclear fuel in generation II and III reactors: research issues related to high burn-up

Content Provider	Royal Society of Chemistry (RSC)
Author	Bertsch, J. Degueldre, C. Kuri, G. Martin, M.
Copyright Year	2011
Abstract	Nuclear fuel has a much higher energy density compared to conventional fuels like fossil and allows an almost green house emission free energy production. Despite its inherent advantages, the performance of nuclear fuel has to be amended due to economical as well as ecological reasons, without constricting its safe use. A higher performance of nuclear fuel means extracting more energy from the fuel. The higher energy yield also implies less volume of highly radioactive spent fuel per produced energy unit. The stronger energy extraction from nuclear fuel leads to a higher burn-up, which means pushing the limits, with the safety limitations fixed by the regulators. This has been carried out, for instance, in Switzerland for many years and has reached about 80 MW d kg−1 or about 8% of fission per initial metal atom “FIMA” in generation (GEN) II reactors. Nuclear fuels consist of different constituents which are the matrix, e.g. non-inert or inert, a fissile part, components such as burnable poisons, fertile isotopes or grain enlargers. The fuel matrix is currently described as the first barrier between fission products and the next nuclear barrier towards the environment. It must remain effective over years. The higher the burn-up the higher the concentration of fission products is in the fuel matrix. The fissile part in the fuel directly contributes to the energy production. The typical enrichment of fissile isotopes in a commercial nuclear fuel is around 5%. A higher enrichment followed by a respective higher burn-up may affect the fission product retention capability of the fuel matrix and its interaction with the cladding. The doping with grain enlargers leads to bigger fuel grains, implying longer diffusion paths, retaining gaseous fission products in the matrix under certain temperature conditions. This shall allow a better pressure control at higher burn-up in GEN II and III reactors. To reach very high burn up >100 MW d kg−1 (equivalent), the only possibilities are offered by inert matrix fuels. This is investigated in the last part of this study. The zirconia inert matrix concept could be used in a last cycle e.g. to burn plutonium excess and minor actinides prior to geological disposal. Prior to and after burn-up, the fuel material is characterized by micro- or nano-beam analysis to gain information on the dispersity of the system, the presence of defect and segregated phases as well as to track fission products. These studies can be performed through a multiscale approach. The fuel structure can be revealed at the macro-, micro-, nano- and sub-nano-level.
Starting Page	1651
Ending Page	1661
Page Count	11
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	4
Issue Number	5
Journal	Energy & Environmental Science
DOI	10.1039/c0ee00476f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Switzerland Nuclear fuel Energy density Fossil fuel Thermodynamic free energy Radioactive decay The Stronger Burnup Nuclear fission Institute of Mathematics and its Applications Composite material Fissile material Nuclear fission product Dopant Diffusion Zirconium dioxide Plutonium Minor actinide
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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