关键词: CFETR氦冷包层, 中子学, 氚增殖比, 均匀化, 空间自屏效应

Abstract: Neutronics calculations based on homogeneous and high-fidelity models for CFETR helium-cooled ceramic breeder (HCCB) blanket have been performed, and results are summarized in this paper, including tritium breeding rate (TBR), neutron spectrum, power distribution and etc. The neutronics effect of homogeneous structure and space self-shielding effect on CFETR HCCB are performed. Also, neutronics effect on the size of the pebbles to the TBR is studied. Results show that the homogeneous model has small impacts on the neutronics performance of CFETR HCCB blanket, the space self-shielding effect of the pebble beds shows a descending trend when the diameter of pebbles decreases and the space self-shielding effect caused by pebble beds has little effect on the neutronics performance of CFETR HCCB blanket. Finally, the results verify that the homogeneous model for neutronic analyses of the HCCB blanket are rational, and the design basis for the high-fidelity neutronic calculation has been provided.

Key words: CFETR HCCB, Neutronics, Tritium breeding ratio, Homogenization, Space self-shielding effect.