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 (6): 81 doi: 10.1007/s41365-018-0414-0

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Study on neutronics design of ordered-pebble-bed fluoride-saltcooled high-temperature experimental reactor

Rui Yan 1 • Shi-He Yu 1 • Yang Zou 1 • Qun Yang 1 • Bo Zhou 1,2 • Pu Yang 1,2 • Hong-Hua Peng 1  • Ya-Fen Liu 1 • Ye Dai 1 • Rui-Ming Ji 1,2 • Xu-Zhong Kang 1 • Xing-Wei Chen 1,2 • Ming-Hai Li 1 • Xiao-Han Yu 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: Yang Zou
  • Supported by:

    This work was supported by the Chinese Academy of Sciences TMSR Strategic Pioneer Science and Technology Project (No. XDA02010000) & Thorium uranium fuel cycle characteristics and key problem research Project (No. QYZDY-SSW-JSC016).

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Rui Yan, Shi-He Yu, Yang Zou, Qun Yang, Bo Zhou, Pu Yang, Hong-Hua Peng, Ya-Fen Liu, Ye Dai, . Study on neutronics design of ordered-pebble-bed fluoride-saltcooled high-temperature experimental reactor.Nuclear Science and Techniques, 2018, 29(6): 81     doi: 10.1007/s41365-018-0414-0


This paper presents a neutronics design of a 10 MW ordered-pebble-bed fluoride-salt-cooled high-temperature experimental reactor. Through delicate layout, a core with ordered arranged pebble bed can be formed, which can keep core stability and meet the space requirements for thermal hydraulics and neutronics measurements. Overall, objectives of the core include inherent safety and sufficient excess reactivity providing 120 effective full power days for experiments. Considering the requirements above, the reactive control system is designed to consist of 16 control rods distributed in the graphite reflector. Combining the large control rods worth about 18000–20000 pcm, molten salt drain supplementary means (- 6980 to - 3651 pcm) and negative temperature coefficient (- 6.32 to - 3.80 pcm/K) feedback of the whole core, the reactor can realize sufficient shutdown margin and safety under steady state. Besides, some main physical properties, such as reactivity control, neutron spectrum and flux, power density distribution, and reactivity coefficient, have been calculated and analyzed in this study. In addition, some special problems in molten salt coolant are also considered, including 6Li depletion and tritium production.

Key words: Ordered-pebble-bed fluoride-salt-cooled hightemperature experimental reactor, Neutronics design, Reactive control, Neutron spectrum, Temperature coefficient