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Report No.
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Development of cesium trap material for coated fuel particles in high temperature gas-cooled reactors

Sasaki, Koei  ; Miura, Shuichiro*; Fukumoto, Kenichi*; Goto, Minoru ; Ohashi, Hirofumi 

Cs-Bi and Cs-Sb absorbed graphite samples (Cs-Bi/graphite and Cs-Sb/graphite) were synthesized and their high temperature chemical stabilities were tested up to 1500$$^{circ}$$C by TG and analyzed by TEM-EDS for the development of Cs trap material in high temperature gas-cooled reactor (HTGR) fuel particles. It was observed that Cs was stabilized by Sb but not by Bi in the specimens after the TG test. A rapid weight loss from 800 to 1000$$^{circ}$$C may be caused by evaporation of Cs (boiling point: 671$$^{circ}$$C) was seen in the TG result of both specimens. Precipitated Cs-Sb substance in the graphite matrix were not resolved even after the 1500$$^{circ}$$C heating. The chemical composition of the Cs-Sb was specified as Cs$$_{3}$$Sb. The experimental results suggest that Sb have potential to be a Cs getter material in graphite matrix. Long term heating test should be performed to confirm adaptability of Sb for Cs trap material in HTGR fuel particles.

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