Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2016, Vol. 27 ›› Issue (6): 139 doi: 10.1007/s41365-016-0143-1

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Analysis of the axial fitting clearance between the fuel rod and the end seat in CIADS

Ya-Feng Shu1 Yong-Wei Yang 1  Xin Sheng 1  Kang Chen 1  De-Liang Fan 1  Lu Zhang 1   

  1. 1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • Contact: Yong-Wei Yang
  • Supported by:

    This work was supported by the ‘‘Strategic Priority Research Program’’ of Chinese Academy of Sciences (No. XDA03030102).

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Ya-Feng Shu, Yong-Wei Yang, Xin Sheng, Kang Chen, De-Liang Fan, Lu Zhang. Analysis of the axial fitting clearance between the fuel rod and the end seat in CIADS.Nuclear Science and Techniques, 2016, 27(6): 139     doi: 10.1007/s41365-016-0143-1


The fuel assembly is key structure in China Initiative Accelerator Driven System, and the axial fitting clearance (AFC) for the fuel assembly design is an essential subject of study. In this paper, different methods are used to calculate critical stress in cylindrical shells. Because the thermal expansion of fuel assembly outer tube is larger than that of the cladding of fuel rod, enough space should be reserved between the upper end plug and upper seat slot. The collapse critical compressive stress of the cladding is obtained numerically through ANSYS simulation calculation. The AFC range between the fuel rod cladding and the end seat due to the displacement of thermal expansion is given by the theoretical formulas and ANSYS buckling analysis. These provide a reference for the AFC design of the reactor fuel assembly.

Key words: Thermal expansion, Critical stress, AFC calculation, ANSYS simulation