Effect of key parameters on the refueling reactivity coefficient in the pebble-bed high temperature gas-cooled reactor
Effect of key parameters on the refueling reactivity coefficient in the pebble-bed high temperature gas-cooled reactor
Hongwei Wu 1Zhongkai Sheng 2Bing Xia 3Ding She 3Fu Li 3Zuoyi Zhang3
作者信息
- 1. Department of Engineering Physics, Tsinghua University, Beijing 100084, China
- 2. Department of Engineering Physics, Tsinghua University, Beijing 100084, China;Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Tsinghua University, Beijing 100084, China
- 3. Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Tsinghua University, Beijing 100084, China
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摘要
Online continuous refueling is one of the main features of a pebble-bed high-temperature gas-cooled reactor (PB-HTR). During the normal operation of a PB-HTR, positive reactivity is mainly introduced through refueling, whereas negative reactivity is introduced through depletion. Therefore, evaluating the refueling reactivity coefficient is crucial for the safe and stable operation of PB-HTRs. In this study, the perturbation theory is used to calculate the refueling reactivity coefficient, and the effect of key parameters on the refueling reactivity coefficient is examined based on the HTR-PM equilibrium core. The refueling reactivity introduced into the reactor core is driven by the gradient of the nuclide atomic density, particularly U-235. The neutron flux modulates the spatial distribution of the refueling reactivity. The loading fraction of the fresh fuel directly and positively influences the refueling reactivity coefficient. This study provides comprehensive insights into the effect of these parameters on the refueling of PB-HTRs, paving the way for efficient fuel management.
Abstract
Online continuous refueling is one of the main features of a pebble-bed high-temperature gas-cooled reactor (PB-HTR). During the normal operation of a PB-HTR, positive reactivity is mainly introduced through refueling, whereas negative reactivity is introduced through depletion. Therefore, evaluating the refueling reactivity coefficient is crucial for the safe and stable operation of PB-HTRs. In this study, the perturbation theory is used to calculate the refueling reactivity coefficient, and the effect of key parameters on the refueling reactivity coefficient is examined based on the HTR-PM equilibrium core. The refueling reactivity introduced into the reactor core is driven by the gradient of the nuclide atomic density, particularly U-235. The neutron flux modulates the spatial distribution of the refueling reactivity. The loading fraction of the fresh fuel directly and positively influences the refueling reactivity coefficient. This study provides comprehensive insights into the effect of these parameters on the refueling of PB-HTRs, paving the way for efficient fuel management.关键词
Refueling reactivity coefficient/PB-HTR/perturbation theoryKey words
Refueling reactivity coefficient/PB-HTR/perturbation theory引用本文复制引用
Hongwei Wu,Zhongkai Sheng,Bing Xia,Ding She,Fu Li,Zuoyi Zhang.Effect of key parameters on the refueling reactivity coefficient in the pebble-bed high temperature gas-cooled reactor[EB/OL].(2026-03-12)[2026-03-14].https://chinaxiv.org/abs/202603.00064.学科分类
核反应堆工程/核燃料、核燃料生产
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