tailieunhanh - Contribution to the study of fission products release from nuclear fuels in severe accident conditions: effect of the pO2 on Cs, Mo and Ba speciation

The objective of this work is to experimentally investigate the effect of the oxygen potential on the fuel and FP chemical behaviour in conditions representative of a severe accident. More specifically, the speciation of Cs, Mo and Ba is investigated. | Contribution to the study of fission products release from nuclear fuels in severe accident conditions effect of the pO2 on Cs Mo and Ba speciation EPJ Nuclear Sci. Technol. 6 2 2020 Nuclear Sciences C. Le Gall et al. published by EDP Sciences 2020 amp Technologies https epjn 2019058 Available online at https REGULAR ARTICLE Contribution to the study of fission products release from nuclear fuels in severe accident conditions effect of the pO2 on Cs Mo and Ba speciation Claire Le Gall1 Fabienne Audubert1 Jacques Léchelle1 Yves Pontillon1 and Jean-Louis Hazemann2 1 CEA DEN DEC Cadarache 13108 Saint-Paul-Lez-Durance France 2 Institut Néel CNRS UGA amp CRG FAME ESRF 38041 Grenoble cedex 9 France Received 30 October 2019 Accepted 15 November 2019 Abstract. The objective of this work is to experimentally investigate the effect of the oxygen potential on the fuel and FP chemical behaviour in conditions representative of a severe accident. More specifically the speciation of Cs Mo and Ba is investigated. These three highly reactive FP are among the most abundant elements produced through 235U and 239Pu thermal fission and may have a significant impact on human health and environmental contamination in case of a light water reactor severe accident. This work has set out to contribute to the following three fields providing experimental data on Pressurized Water Reactor PWR MOX fuel behaviour submitted to severe accident conditions and related FP speciation going further in the understanding of FP speciation mechanisms at different stages of a severe accident developing a method to study volatile FP behaviour involving the investigation of SIMFuel samples manufactured at low temperature through SPS. In this paper a focus is made on the impact of the oxygen potential towards the interaction between irradiated MOX fuels and the cladding the interaction between Mo and Ba under oxidizing conditions and the assessment of the oxygen potential during .