Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Time-frequency analysis of reactor neutron noise under bubble disturbance and control rod vibration

  • Yuan, Baoxin (China Academy of Engineering Physics, Insititute of Nuclear Physics and Chemistry) ;
  • Guo, Simao (China Academy of Engineering Physics, Insititute of Nuclear Physics and Chemistry) ;
  • Yang, Wankui (China Academy of Engineering Physics, Insititute of Nuclear Physics and Chemistry) ;
  • Zhang, Songbao (China Academy of Engineering Physics, Insititute of Nuclear Physics and Chemistry) ;
  • Zhong, Bin (Institute of Applied Physics and Computational Mathematics) ;
  • Wei, Junxia (Institute of Applied Physics and Computational Mathematics) ;
  • Ying, Yangjun (Institute of Applied Physics and Computational Mathematics)
  • Received : 2020.05.01
  • Accepted : 2020.10.05
  • Published : 2021.04.25
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Abstract

Time-frequency analysis technique is an effective analysis tool for non-stationary processes. In the field of reactor neutron noise, the time-frequency analysis method has not been thoroughly researched and widely used. This work has studied the time-frequency analysis of the reactor neutron noise experimental signals under bubble disturbance and control rod vibration. First, an experimental platform was established, and it could be employed to reactor neutron noise experiment and data acquisition. Secondly, two types of reactor neutron noise experiments were performed, and valid experimental data was obtained. Finally, time-frequency analysis was conducted on the experimental data, and effective analysis results were obtained in the low-frequency part. Through this work, it can be concluded that the time-frequency analysis technique can effectively investigate the core dynamics behavior and deepen the identification of the unstable core process.

Keywords

Acknowledgement

Thanks to national key R&D plan project (No.2019YFB1901200), Sichuan science and technology plan project (2018JY0622), fundamental project of the NPL CAEP (No.232).

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