In order to study the burnable poisons with better performance, to meet the requirements of suppressing excess reactivity at the beginning of the lifetime and matching the longer cycle operation requirements of the reactor core, a new type of burnable poison design concept, a Matryoshka burnable poison (MDBP), was studied, and the DRAGON program was used to develop materials such as Gd and B with faster burnup rate, and materials such as Er and Hf with slower burnup rate. Matching of different types of burnable poisons was studied, and the appl...
