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For fast spectrum reactors, the reactivity control of the core mainly relies on control rods. Due to the continuous insertion of control rods into the core during reactor operation, the amount of the control rod absorbers will decrease because of the reaction with neutron, which is known as the control rod depletion. In this research, the RMC code, which solves the neutron transport equations based on the Monte Carlo method, is used to analyze the control rod depletion in a typical fast spectrum core, while considering the control rod moves in the core. The calculation method and burnup characteristics of the control rods in a reactor core with the reactivity controlled by the control rod were investigated. The burnup characteristics of control rods from four perspectives, namely flux level, B10 loading, spatial self-shielding effect, and neutron energy spectrum was investigated. The burnup characteristics of the control rod absorber and the reactivity loss due to the burnup are also analyzed.

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The Analysis of the Characteristic of Control Rod Burnup Based on RMC in Fast Reactor

  • 会议论文

  • 发表日期：

    2026年

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  • Yun Cai,
  • Tianya Li,
  • Lianjie Wang,
  • Bangyang Xia,
  • Rui Guo,
  • Qing Li

摘要

For fast spectrum reactors, the reactivity control of the core mainly relies on control rods. Due to the continuous insertion of control rods into the core during reactor operation, the amount of the control rod absorbers will decrease because of the reaction with neutron, which is known as the control rod depletion. In this research, the RMC code, which solves the neutron transport equations based on the Monte Carlo method, is used to analyze the control rod depletion in a typical fast spectrum core, while considering the control rod moves in the core. The calculation method and burnup characteristics of the control rods in a reactor core with the reactivity controlled by the control rod were investigated. The burnup characteristics of control rods from four perspectives, namely flux level, B10 loading, spatial self-shielding effect, and neutron energy spectrum was investigated. The burnup characteristics of the control rod absorber and the reactivity loss due to the burnup are also analyzed.