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From the pages of Nuclear News: Industry update November 2023
Here is a recap of industry happenings from the recent past:
Centrus-Oklo partnership expands
Oklo, a California-based developer of next-generation fission reactors, has expanded its partnership with Centrus Energy, a Maryland-based supplier of nuclear fuel and services. The two companies have been cooperating since 2021 on the development of Centrus’s American Centrifuge Plant in Piketon, Ohio, to produce high-assay low-enriched uranium (HALEU) fuel. According to the companies’ new memorandum of understanding, Centrus will manufacture certain components for Oklo’s Aurora “powerhouse” reactor, a fast neutron reactor designed to generate up to 15 MW of power and operate for at least 10 years without refueling. The Aurora is also designed to produce usable heat. Centrus also has agreed to purchase electricity generated by the Aurora reactors, while Oklo has agreed to purchase HALEU fuel from the Piketon facility. The facility is expected to begin fuel production before the end of the year.
Amber L. Hames, Alena Paulenova, James L. Willit, Mark A. Williamson
Nuclear Technology | Volume 203 | Number 3 | September 2018 | Pages 272-281
Technical Paper | doi.org/10.1080/00295450.2018.1448673
Articles are hosted by Taylor and Francis Online.
Regions of the LiCl-KCl-UCl3 phase diagram used to represent the molten salt compositions generated during the electrorefining of used nuclear fuel were evaluated by studying the LiCl-UCl3 and KCl-UCl3 binary systems and several ternary mixtures. Phase transition temperatures of several binary and ternary mixtures made with LiCl, KCl, and UCl3 were measured by using differential scanning calorimetry. Inductively coupled plasma-atomic emission spectroscopy was used to measure the gross compositions of the salt mixtures and X-ray diffraction (XRD) was used to identify the phases formed after they were thermally cycled and had cooled to room temperature. The LiCl-UCl3 system has a eutectic transition at 763 ± 2 K for a mixture with 25 mol % UCl3. The KCl-UCl3 system has two eutectic transitions, one at 827 ± 3 K and another at 805 ± 4 K for mixtures with 19 mol % UCl3 and 57 mol % UCl3, respectively, and the congruently melting compound K2UCl5 was identified to have formed by XRD. The LiCl-UCl3 and KCl-UCl3 binary phase diagrams were developed and combined with the LiCl-KCl phase diagram to produce a portion of the LiCl-KCl-UCl3 phase diagram. The LiCl-KCl-UCl3 system includes two ternary eutectics, one occurring at 681 ± 6 K for the mixture with 33 mol % UCl3, 42.0 mol % LiCl, and 25 mol % KCl, and the other at 619 ± 1 K for the mixture with 8 mol % UCl3, 50.0 mol % LiCl, and 42 mol % KCl. The evaluation of these phase diagrams provides an improved understanding of the LiCl-KCl-UCl3 systems generated during electrorefining.