Title: Recent advances in the study of the UO2 – PuO2 phase diagram at high temperatures
Authors: BÖHLER ROBERTWELLAND MikePRIEUR DAMIENCAKIR PELINVITOVA T.PRUESSMANN T.PIDCHENKO I.HENNIG C.GUÉNEAU C.KONINGS RudyMANARA Dario
Citation: JOURNAL OF NUCLEAR MATERIALS vol. 448 p. 330 - 339
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2014
JRC N°: JRC85832
ISSN: 0022-3115
URI: www.elsevier.com/locate/jnucmat
http://publications.jrc.ec.europa.eu/repository/handle/JRC85832
DOI: 10.1016/j.jnucmat.2014.02.029
Type: Articles in periodicals and books
Abstract: Recently, novel container-less laser heating experimental data have been published on the melting behaviour of pure PuO2 and PuO2-rich compositions in the uranium dioxide-plutonium dioxide system. Such data showed that previous data obtained by more traditional furnace heating techniques were affected by extensive interaction between the sample and its containment. It is therefore paramount to check whether data so far used by nuclear engineers for the uranium-rich side of the pseudo-binary dioxide system can be confirmed or not. In the present work, new data are presented both in the UO2-rich part of the phase diagram, most interesting for the uranium-plutonium oxide based nuclear fuel safety, and in the PuO2 side. The new results confirm earlier furnace heating data in the uranium-dioxide rich part of the phase diagram, and more recent laser-heating data in the plutonium-dioxide side of the system. As a consequence, it is also confirmed that a minimum melting point must exist in the UO2 – PuO2 system, at a composition between x(PuO2) = 0.4 and x(PuO2) = 0.7 and 2900 K ≤ T ≤ 3000 K.
JRC Directorate:Nuclear Safety and Security

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