(EN) The present invention relates to: pellets containing an oxide additive in order to improve fission gas adsorbing performance of the uranium dioxide pellets used as nuclear fuel and, at the same time, promote the size growth of crystal grains of the uranium dioxide pellets; and a manufacturing method therefor. The La2O3-Al2O3-SiO2 sintering additive is added to uranium dioxide so that a liquid phase generated when sintering the uranium dioxide pellets accelerates mass transfer, thereby promoting the growth of the crystal grains, and also, the low vapor pressure of the liquid phase results in less volatilization during sintering, and thus the additive can exert efficient performance, and as a result, the liquid phase enclosing crystal grain boundaries can effectively adsorb the fission gas cesium.
(FR) La présente invention concerne : des pastilles contenant un additif d'oxyde pour améliorer les performances d'adsorption de gaz de fission de pastilles de dioxyde d'uranium utilisées comme combustible nucléaire et, simultanément, favoriser la croissance de taille de grains cristallins des pastilles de dioxyde d'uranium ; et leur procédé de fabrication. L'additif de frittage La2O3-Al2O3-SiO2 est ajouté au dioxyde d'uranium, de sorte qu'une phase liquide générée lors du frittage des pastilles de dioxyde d'uranium accélère un transfert de masse, favorisant ainsi la croissance de grains cristallins, et la faible pression de vapeur de la phase liquide entraîne moins de volatilisation pendant le frittage, par conséquent, l'additif peut manifester une performance efficace, et la phase liquide encerclant les limites de grains cristallins ainsi obtenue peut adsorber efficacement le césium gazeux de fission.
(KO) 본 발명은 핵연료로 사용되는 이산화우라늄 소결체의 핵분열 기체 흡착성능을 향상시키고, 동시에 결정립 크기 성장을 촉진시키기 위해 산화물 첨가제를 함유한 소결체 및 이의 제조방법에 관한 것으로, 이산화우라늄에 La2O3-Al2O3-SiO2 소결 첨가제가 첨가함으로써, 이산화우라늄 소결체의 소결 시 생성되는 액상으로 인해 물질이동이 가속화되어 결정립 성장이 촉진될 뿐만 아니라 액상의 증기압이 낮아 소결 중 휘발이 적게 되므로 효율적인 첨가제 성능을 발휘할 수 있고, 이로 인하여 결정립계를 감싸고 있는 액상이 핵분열 기체인 세슘을 효과적으로 흡착할 수 있다.
