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Effect of KLT-40S Fuel Assembly Design on Burnup Characteristics

Author

Listed:
  • Zedong Zhou

    (School of Nuclear Science and Technology, University of South China, Hengyang 421001, China)

  • Jinsen Xie

    (School of Nuclear Science and Technology, University of South China, Hengyang 421001, China)

  • Nianbiao Deng

    (School of Nuclear Science and Technology, University of South China, Hengyang 421001, China)

  • Pengyu Chen

    (School of Nuclear Science and Technology, University of South China, Hengyang 421001, China)

  • Zhiqiang Wu

    (School of Nuclear Science and Technology, University of South China, Hengyang 421001, China)

  • Tao Yu

    (School of Nuclear Science and Technology, University of South China, Hengyang 421001, China)

Abstract

The KLT-40S is a small modular reactor developed by Russia based on the KLT-40 reactor with two fuel assembly designs: a four-ring and a five-ring. Few studies have been published on fuel assembly and power-flattening designs for the KLT-40S. In this paper, the effects of different fuel assembly designs on burnup and power flattening are investigated. This paper compares the effects of the two fuel assembly designs of the KLT-40S on its burnup characteristics, analyzes the effects of fuel rod diameter on burnup characteristics, and conducts a computational study on the ideal power-flattening design. The results show that the five-ring fuel assembly design has better burnup characteristics than the four-ring fuel assembly design. At a fuel rod diameter of 0.62 cm, the optimal burnup lattice is obtained. The 15.84% + 19.75% power-flattening design (uranium enrichment in the innermost and outermost rings + uranium enrichment in inner rings) reduces the local power peaking factor of the five-ring fuel assembly below 1.11 throughout the lifetime. Therefore, the KLT-40S five-ring fuel assembly has better burnup characteristics, and its optimal burnup lattice is at the 0.62 cm fuel rod diameter. The use of power-flattening designs can effectively reduce the local power peaking factor.

Suggested Citation

  • Zedong Zhou & Jinsen Xie & Nianbiao Deng & Pengyu Chen & Zhiqiang Wu & Tao Yu, 2023. "Effect of KLT-40S Fuel Assembly Design on Burnup Characteristics," Energies, MDPI, vol. 16(8), pages 1-14, April.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:8:p:3364-:d:1120741
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    References listed on IDEAS

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