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 ›› 2018, Vol. 29 ›› Issue (10): 141 doi: 10.1007/s41365-018-0488-8

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Numerical study of the dynamic characteristics of a single-layer graphite core in a thorium molten salt reactor

Yang Zhong 1,2 • Xiong Yang 1,2 • Dong Ding 1,2 • Yang Zou 1 • D. K. L. Tsang 1   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Contact: D. K. L. Tsang E-mail:derektsang@sinap.ac.cn
  • Supported by:

    This work was supported by the ‘‘Hundred Talent Program’’ of the Chinese Academy of Sciences, the Ministry of Human Resources and Social Security (No. Y419016031), and the Strategic Priority Research Program of Chinese Academy of Science (No. XDA02040100).

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Yang Zhong, Xiong Yang, Dong Ding, Yang Zou, D.K.L. Tsang. Numerical study of the dynamic characteristics of a single-layer graphite core in a thorium molten salt reactor.Nuclear Science and Techniques, 2018, 29(10): 141     doi: 10.1007/s41365-018-0488-8
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Abstract:

A reactor core in a thorium molten salt reactor uses graphite as a moderator and reflector. The graphite core is a multi-layered arrangement of graphite bricks that are loosely connected to each other using a system of keys and dowels. Consequently, the graphite core is a type of discrete stack structure with highly nonlinear dynamic behavior. Hence, it is important to investigate the dynamic characteristics of the graphite core. In this study, a threedimensional single-layer graphite core model, which is a part of the thorium molten salt reactor side reflector structure, was analyzed using the explicit method in ABAQUS 2016 to study the core dynamic behavior when subjected to different excitations. The design parameters, such as the diameter of the dowel, the gap between key and keyway and the bypass flow gap between two adjacent bricks, were also considered in this model. To reduce excessive demands on available computational resources considering the effect of molten salt, the spring–dashpot model was applied to model the interaction forces between the molten salt and graphite bricks. Numerical simulation results show that the effect of molten salt is a reduction in the peak maximal principal stress, and a larger gap between two bricks is beneficial to maintain the integrity of the graphite core under earthquake loading. The results obtained by the simulation can be used as a reference for future designs of a molten salt graphite core.

Key words: Graphite core, Dynamic behavior, ABAQUS