Chlorination of UO2 and (U,Zr)O2 solid solution using MoCl5 |
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| Authors: | Takumi Sato Hiroki Shibata Hirokazu Hayashi Masahide Takano Masaki Kurata |
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| Affiliation: | 1. Nuclear Science and Engineering Center, Japan Atomic Energy Agency, 2-4 Shirakata-shirane, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japansato.takumi@jaea.go.jp;3. Nuclear Science and Engineering Center, Japan Atomic Energy Agency, 2-4 Shirakata-shirane, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan |
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| Abstract: | Conversion of UO2 and (U0.5Zr0.5)O2 solid solution into chlorides by MoCl5 was performed in order to confirm the applicability of the chlorination by MoCl5 to a pretreatment of fuel debris by pyrochemical methods. Chlorination of (U0.5Zr0.5)O2 powders and dense pieces was successfully achieved at 573 and 773 K, respectively, based on the following chemical reaction: 2(U0.5Zr0.5)O2 + 4MoCl5 = UCl4 + ZrCl4 + 4MoOCl3. Rough separation of MoCl5, ZrCl4 and MoOCl3 from UCl4 was achieved by volatilization under temperature gradient. From these results, fundamental feasibility of the chlorination method using MoCl5 as a pretreatment of fuel debris was shown. |
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| Keywords: | severe accident fuel debris chlorination molybdenum pentachloride uranium oxide uranium oxide and zirconium oxide solid solution pyrochemical process |
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