AUTHOR=Lei Lou , Xiaoming Chai , Dong Yao , Lianjie Wang , Mancang Li , Liang Chen , Xiaoli Liu , Hongbo Zhang , Sinan Li , Xiao Tang , Nan Zhou 

TITLE=Theoretically Modified Optical Length Research on the Physical Boundary of the Double-Heterogeneous System

JOURNAL=Frontiers in Energy Research

VOLUME=Volume 9 - 2021

YEAR=2022

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2021.773067

DOI=10.3389/fenrg.2021.773067

ISSN=2296-598X

ABSTRACT=Because of the Double-Heterogeneity (DH), Dispersed particle-type systems cannot be described by traditional neutronic programs, and Volumetric Homogenization Method (VHM) will bring reactivity calculation deviation because of ignoring the spatial self-shielding effect of the particles. In this article, the relation betweenthe reactivity calculation deviation and the optical length of dispersed particle-type fuel and different types of burnable poisons is analyzed. And then it’s proposed that the influencing factors of reactivity calculation deviation can be integrated to a physical quantity named corrected optical length containing the above influencing factors.And the DH physical boundary is put forward that, when the corrected optical length is larger than 10-4, reactivity calculation deviation of VHM will be larger than 100pcm, and the DH of the dispersed particle-type systems should be considered.