METHOD FOR CYLINDRICAL NEUTRON ABSORBER CONTAINING RARE EARTH OXIDES FROM SPENT NUCLEAR FUEL AND THE APPARATUS THEREOF

摘要

The present invention relates to a method for cylindrical neutron absorber by using rare earth oxides from spent nuclear fuel and an apparatus thereof. More specifically, the invention is the method to manufacture pellet having rare earth oxides as an cylindrical neutron absorber by mixing a glass media of SiO_2, Al_2O_3 and B_2O_3 with rare earth oxides. According to the invention,producing pellet having over 50 wt% of the rare earth oxides in a simple way features the method. The benefits of the pellet having rare earth oxides are a very high density, improved heat regarding stability, and improved leaching resistance with very low leaking speed of radioactive substances.