Cesium release during high-temperature pre-treatment of fuel fragments with a burn-up of 61 GWd/tU
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The electrolytic reduction process in pyroprocessing of used fuel requires that fuel fragments be pre-treated to remove cesium and iodine. The effect of high temperatures and fuel fragment size on release of cesium was investigated over 10 h at a temperature of 1300–1400 °C for fuel fragments with an O/U ratio of 2.2. Re-fragmentation of the original fragments was observed as changes in cesium release count rates as fuel was heated from 484 to 1329 °C. The release of cesium is highly dependent on the size of fuel fragments and most of the cesium is released as the temperature is held at the maximum target value.
KeywordsUsed fuel Cesium release Fragment Thermal pre-treatment
This work was supported by a grant from the Nuclear Research & Development Program of National Research Foundation (NRF) funded by the Ministry of Science, ICT & Future Planning (MSIP), Republic of Korea.
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