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In the pressure vessel of the nuclear reactors, the control rod drive mechanism (CRDM) is the unique motional equipment. The functions about the moving up, the downwards, the position maintenance, and the scram of the control rods should be conducted by the CRDM. The power of the reactor will be affected by the position of the control rods, and the position signal of the control rods should be measured timely. Thus, a rod position indicator should be equipped, in order to perform the function of the monitoring of the control rods position. Many parameters can be recognized by the capacitive sensors, including the angle, the thickness, the displacement, etc. Thus, for the position information of the control rods, the capacitive sensors possess an excellent prospect. Some structures of the capacitive rod position detector (CRPD) are designed, and some works about the performance analysis of the CRPD are carried out by INET, Tsinghua University. Generally speaking, the main components of the CRPD include an annular skeleton, electrode assemble, measured medium, a shielding. The electrode assemble can be used as capacitors. When the measured medium moves within the inner channel of the annular skeleton, the electric potential function between the electrode assemble can be changed. The output signal of the CRPD will be changed correspondingly. In terms of the configuration of the electrode assemble, two or more continuous straight/helix electrodes had been adopted by the existing designs, and some capacitors can be formed. However, because of the configuration of the electrode assemble is continuous, resulting in the zero position of the CRPD is susceptible to the installation accuracy of the CRPD. In order to reduce the requirements about the installation accuracy of the CRPD, a new method to recognize control rods position based array-continuity capacitor is proposed in this paper. The structure optimization design of the static measuring channel and the dynamic measuring channel are conducted, and the precision of the indicators is analyzed.

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A Method for Measuring Control Rod Position Based Array-Continuation Capacitive Detector

  • 会议论文

  • 发表日期：

    2026年

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  • Yanlin Li,
  • Benke Qin,
  • Wen He,
  • Hanliang Bo

摘要

In the pressure vessel of the nuclear reactors, the control rod drive mechanism (CRDM) is the unique motional equipment. The functions about the moving up, the downwards, the position maintenance, and the scram of the control rods should be conducted by the CRDM. The power of the reactor will be affected by the position of the control rods, and the position signal of the control rods should be measured timely. Thus, a rod position indicator should be equipped, in order to perform the function of the monitoring of the control rods position. Many parameters can be recognized by the capacitive sensors, including the angle, the thickness, the displacement, etc. Thus, for the position information of the control rods, the capacitive sensors possess an excellent prospect. Some structures of the capacitive rod position detector (CRPD) are designed, and some works about the performance analysis of the CRPD are carried out by INET, Tsinghua University. Generally speaking, the main components of the CRPD include an annular skeleton, electrode assemble, measured medium, a shielding. The electrode assemble can be used as capacitors. When the measured medium moves within the inner channel of the annular skeleton, the electric potential function between the electrode assemble can be changed. The output signal of the CRPD will be changed correspondingly. In terms of the configuration of the electrode assemble, two or more continuous straight/helix electrodes had been adopted by the existing designs, and some capacitors can be formed. However, because of the configuration of the electrode assemble is continuous, resulting in the zero position of the CRPD is susceptible to the installation accuracy of the CRPD. In order to reduce the requirements about the installation accuracy of the CRPD, a new method to recognize control rods position based array-continuity capacitor is proposed in this paper. The structure optimization design of the static measuring channel and the dynamic measuring channel are conducted, and the precision of the indicators is analyzed.