Conceptual design of quadriso particles with europium burnable absorber in HTRS.

Talamo, A. ; Nuclear Engineering Division

关键词: BURNABLE POISONS;    DESIGN;    ERBIUM;    EUROPIUM;    FISSILE MATERIALS;    FISSION;    FUEL CYCLE;    FUEL PARTICLES;    LAYERS;    MIXING;    NEUTRONS;    ORES;    PARTICLES;    REACTIVITY;    REACTO;   

DOI  :  10.2172/979897
RP-ID  :  ANL-10/14
PID  :  OSTI ID: 979897
Others  :  TRN: US201012%%1189

美国|英语

来源: SciTech Connect

【 摘 要 】

In High Temperature Reactors, burnable absorbers are utilized to manage the excess reactivity at the early stage of the fuel cycle. In this study QUADRISO particles are proposed to manage the initial xcess reactivity of High Temperature Reactors. The QUADRISO concept synergistically couples the decrease of the burnable poison with the decrease of the fissile materials at the fuel particle level. This echanism is set up by introducing a burnable poison layer around the fuel kernel in ordinary TRISO particles or by mixing the burnable poison with any of the TRISO coated layers. At the beginning of life, the nitial excess reactivity is small because some neutrons are absorbed in the burnable poison and they are prevented from entering the fuel kernel. At the end of life, when the absorber is almost depleted, ore eutrons stream into the fuel kernel of QUADRISO particles causing fission reactions. The mechanism has been applied to a prismatic High Temperature Reactor with europium or erbium burnable absorbers, showing a significant reduction in the initial excess reactivity of the core.