Frontiers in Energy Research (Jan 2021)

Dynamic Characteristics of Accelerator-Driven Subcritical Reactor With Self-Adapting Multi-Mode Core Few-Group Constants

  • Nianbiao Deng,
  • Nianbiao Deng,
  • Jinsen Xie,
  • Jinsen Xie,
  • Cheng Hou,
  • Wenjie Zeng,
  • Wenjie Zeng,
  • Zhenping Chen,
  • Zhenping Chen,
  • Tao Yu,
  • Tao Yu,
  • Pengcheng Zhao,
  • Pengcheng Zhao,
  • Zijing Liu,
  • Zijing Liu,
  • Chao Xie,
  • Chao Xie,
  • Qin Xie,
  • Qin Xie

DOI
https://doi.org/10.3389/fenrg.2020.603084
Journal volume & issue
Vol. 8

Abstract

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In this study, the dynamic characteristics of accelerator-driven subcritical reactor (ADSR) under beam transients with high heterogeneity of neutron flux in time-space are investigated. Multi-mode core few-group constants are generated by three kinds of neutron fluxes: steady state of ADSR, λ-eigenvalue fundamental wave, and α-eigenvalue fundamental wave. The proposed few-group constants overcome the limitation of single few-group constant generated by two-step method that cannot consider the variation in neutron flux density and neutron energy spectrum with time and space. Compared to the existing few-group constants generated by two-step method under different operating conditions, the self-adapting multi-mode core few-group constants exhibit higher accuracy in the case of following two modes: steady-state mode of ADSR in the starting process and λ-eigenvalue mode in the beam trip condition. Overall, this research provides useful insights on neutron kinetics and can boost the development of ADSRs.

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