DOI QR코드

DOI QR Code

Performance of different absorber materials and move-in/out strategies for the control rod in small rod-controlled pressurized water reactor: A study based on KLT-40 model

  • Zhiqiang Wu (School of Nuclear Science and Technology, University of South China) ;
  • Jinsen Xie (School of Nuclear Science and Technology, University of South China) ;
  • Pengyu Chen (School of Nuclear Science and Technology, University of South China) ;
  • Yingjie Xiao (School of Nuclear Science and Technology, University of South China) ;
  • Zining Ni (School of Nuclear Science and Technology, University of South China) ;
  • Tao Liu (School of Nuclear Science and Technology, University of South China) ;
  • Nianbiao Deng (School of Nuclear Science and Technology, University of South China) ;
  • Aikou Sun (School of Nuclear Science and Technology, University of South China) ;
  • Tao Yu (School of Nuclear Science and Technology, University of South China)
  • 투고 : 2023.12.01
  • 심사 : 2024.02.18
  • 발행 : 2024.07.25

초록

Small rod-controlled pressurized water reactors (PWR) are the ideal energy source for vessel propulsion, benefiting from their high reactivity control efficiency. Since the control rods (CRs) increase the complexity of reactivity control, this paper seeks to study the performance of CRs in small rod-controlled PWRs to extend the lifetime and reduce power offset due to CRs. This study investigates CR grouping, move-in/out strategies, and axially non-uniform design effects on core neutron physics metrics. These metrics include axial offset (AO), core lifetime (CL), fuel utilization (FU), and radial power peaking factor (R-PPF). To simulate the movement of the CRs, a "Critical-CR-burnup" function was developed in OpenMC. In CR designs, the CRs are grouped into three banks to study the simultaneous and prioritized move-in/out strategies. The results show CL extension from 590 effective full power days (EFPDs) to 638-698 EFPDs. A lower-worth prioritized strategy minimizes AO and the extremum values decrease from -0.69 and + 0.81 to -0.28 and + 0.51. Although an axially non-uniform CR design can improve AO at the beginning of cycle (BOC), considering the overall CR worth change is crucial, as a significant decrease can adversely impact axial power distribution during the middle of cycle (MOC).

키워드

과제정보

This work is supported by the Graduate Research Innovation Project of Hunan Province (No. CX20230963) and the National Natural Science Foundation of China (No. U2267207).

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