Spark plasma sintering of (U,Ce)O2 as a MOx nuclear fuel surrogate
Spark plasma sintering of (U,Ce)O2 as a MOx nuclear fuel surrogate
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火花等离子体烧结 (U,Ce)O2 作为 MOx 核燃料替代品
DOI:
10.1016/j.jnucmat.2021.153302
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发表时间:
2021
影响因子:
3.1
通讯作者:
Harrison R
中科院分区:
文献类型:
--
作者:
Harrison R
Mixed uranium plutonium oxides (MOx) are currently used as nuclear fuel in thermal fission reactors and are the leading candidate for use in solid fuelled fast reactors given a wealth of irradiation data from research and prototype systems. Spark plasma sintering (SPS) has been shown to reduce the sintering temperature and time required to manufacture UO2fuel pellets and may benefit MOx production through the more efficient retention of volatile minor actinides (MAs) such as AmO2in the manufacture of these fuels. In this study we have examined SPS as an alternative field assisted sintering route to UO2and MOx fuel manufacture on surrogate (U0.93,Ce0.07)O2prepared by a micronized master blend (MIMAS) type process. SPS has been shown to produce pellets of high density, > 95% TD at sintering temperatures of 1573 K and hold time of 5 min, comparable to equivalent pellets produced through conventional sintering at 1973 K for 5 h. The formation of Ce-rich regions has been measured showing the size distribution of Ce-rich particles in SPS Ce-MOx is similar to conventionally sintered Ce-MOx and are appropriate for MOx fuel specifications. However, a significant difference is observed in the Ce content of the Ce-rich particles which remain close to their primary blend composition, as well as having a high degree of heterogeneity within the Ce-rich regions. The effect of the shortened sintering temperatures and times on other microstructural properties are also revealed.
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