{"title":"指导快中子堆MOX燃料制造的氧势和氧扩散数据","authors":"Romain Vauchy , Yuta Horii , Shun Hirooka , Masatoshi Akashi , Takeo Sunaoshi , Shinya Nakamichi , Kosuke Saito","doi":"10.1016/j.jnucmat.2025.156115","DOIUrl":null,"url":null,"abstract":"<div><div>Controlling the Oxygen/Metal ratio during the sintering of uranium−plutonium mixed oxide fuels is strategic, especially for fast neutron reactors. Within the frame of understanding the reduction of MOX during its sintering, new oxygen potential data and oxygen chemical diffusion coefficients of U<sub>0.698</sub>Pu<sub>0.289</sub>Am<sub>0.013</sub>O<sub>2−x</sub> were determined by thermogravimetry between 1773 and 1923 K on elongated cylindrical dense pellets. An innovative experimental protocol was developed to correlate oxygen chemical diffusion to Oxygen/Metal ratio ranges, and thus to the underlying defect chemistry. Oxygen self-diffusion coefficients were also obtained by combining the oxygen chemical diffusion coefficients with defect chemistry. These new data provide a better understanding of the mechanisms and kinetics of MOX reduction during its manufacturing as a fast neutron reactor fuel.</div></div>","PeriodicalId":373,"journal":{"name":"Journal of Nuclear Materials","volume":"616 ","pages":"Article 156115"},"PeriodicalIF":3.2000,"publicationDate":"2025-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Oxygen potential and oxygen diffusion data for guiding the manufacture of MOX fuel for fast neutron reactors\",\"authors\":\"Romain Vauchy , Yuta Horii , Shun Hirooka , Masatoshi Akashi , Takeo Sunaoshi , Shinya Nakamichi , Kosuke Saito\",\"doi\":\"10.1016/j.jnucmat.2025.156115\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Controlling the Oxygen/Metal ratio during the sintering of uranium−plutonium mixed oxide fuels is strategic, especially for fast neutron reactors. Within the frame of understanding the reduction of MOX during its sintering, new oxygen potential data and oxygen chemical diffusion coefficients of U<sub>0.698</sub>Pu<sub>0.289</sub>Am<sub>0.013</sub>O<sub>2−x</sub> were determined by thermogravimetry between 1773 and 1923 K on elongated cylindrical dense pellets. An innovative experimental protocol was developed to correlate oxygen chemical diffusion to Oxygen/Metal ratio ranges, and thus to the underlying defect chemistry. Oxygen self-diffusion coefficients were also obtained by combining the oxygen chemical diffusion coefficients with defect chemistry. These new data provide a better understanding of the mechanisms and kinetics of MOX reduction during its manufacturing as a fast neutron reactor fuel.</div></div>\",\"PeriodicalId\":373,\"journal\":{\"name\":\"Journal of Nuclear Materials\",\"volume\":\"616 \",\"pages\":\"Article 156115\"},\"PeriodicalIF\":3.2000,\"publicationDate\":\"2025-08-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Nuclear Materials\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0022311525005094\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Nuclear Materials","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022311525005094","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Oxygen potential and oxygen diffusion data for guiding the manufacture of MOX fuel for fast neutron reactors
Controlling the Oxygen/Metal ratio during the sintering of uranium−plutonium mixed oxide fuels is strategic, especially for fast neutron reactors. Within the frame of understanding the reduction of MOX during its sintering, new oxygen potential data and oxygen chemical diffusion coefficients of U0.698Pu0.289Am0.013O2−x were determined by thermogravimetry between 1773 and 1923 K on elongated cylindrical dense pellets. An innovative experimental protocol was developed to correlate oxygen chemical diffusion to Oxygen/Metal ratio ranges, and thus to the underlying defect chemistry. Oxygen self-diffusion coefficients were also obtained by combining the oxygen chemical diffusion coefficients with defect chemistry. These new data provide a better understanding of the mechanisms and kinetics of MOX reduction during its manufacturing as a fast neutron reactor fuel.
期刊介绍:
The Journal of Nuclear Materials publishes high quality papers in materials research for nuclear applications, primarily fission reactors, fusion reactors, and similar environments including radiation areas of charged particle accelerators. Both original research and critical review papers covering experimental, theoretical, and computational aspects of either fundamental or applied nature are welcome.
The breadth of the field is such that a wide range of processes and properties in the field of materials science and engineering is of interest to the readership, spanning atom-scale processes, microstructures, thermodynamics, mechanical properties, physical properties, and corrosion, for example.
Topics covered by JNM
Fission reactor materials, including fuels, cladding, core structures, pressure vessels, coolant interactions with materials, moderator and control components, fission product behavior.
Materials aspects of the entire fuel cycle.
Materials aspects of the actinides and their compounds.
Performance of nuclear waste materials; materials aspects of the immobilization of wastes.
Fusion reactor materials, including first walls, blankets, insulators and magnets.
Neutron and charged particle radiation effects in materials, including defects, transmutations, microstructures, phase changes and macroscopic properties.
Interaction of plasmas, ion beams, electron beams and electromagnetic radiation with materials relevant to nuclear systems.